KR950000829B1 - Video signal recording system - Google Patents

Abstract

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Description

Apparatus for recording and playing back wide video signals over narrowband media

1 is a block diagram of a recording unit of a video recorder implemented according to the present invention.

FIG. 2 is a block diagram of an encoder which is part of the recording unit of FIG.

3 is a block diagram illustrating in detail the adaptive luminance signal separator, the same signal generator, and the color signal separator of the encoder shown in FIG.

4 is a block diagram showing the performance of the adaptive luminance signal separator and the same signal generator of the encoder shown in FIG.

FIG. 5 is a detailed block diagram of a soft switch of the adaptive luminance filtering unit of the encoder illustrated in FIG.

FIG. 6A is a block diagram of a folding circuit that is part of the encoder shown in FIG. 2, and FIG. 6B is a more detailed block diagram of a control signal generator of an adaptive de-emphasis circuit constituting a part of the folding circuit. 6 shows a gain / de-emphasis transfer function including the noise coring function of the gain control signal generator of FIG. 6b, FIG. 6d is a detailed block diagram of the folding modulator of the folding circuit, and FIG. 6e is performed in the folding circuit. Fig. 6f is a vertical-time frequency characteristic diagram of the folding modulation, Fig. 6g is a block diagram of another implementation of the folding circuit, and Fig. 6h is a block diagram of another implementation of the folding circuit. FIG. 6i shows the input signal, FIG. 6j shows the input signal of FIG. 6i after folding by sub-Nyquist sampling, and FIG. 6k shows the predetermined de-emphasis of high frequency components Fig. 6i shows the input signal after folding, Fig. 61 shows the input signal of Fig. 6i after folding with adaptive de-emphasis of the high frequency component according to the present invention, and Fig. 6m shows the noise coring operation. Fig. 6i shows the input signal after folding with adaptive de-emphasis of high frequency components, Fig. 6n shows another implementation of the folding circuit according to the invention, and Fig. 6o or another band shown in Fig. 6n. More detailed block diagram of the separation filter.

FIG. 7A is a detailed block diagram of the color / motion signal mixing circuit of FIG. 2, and FIG. 7B shows a relationship between an NTSC color carrier and the same signal before encoding, and FIG. 7C is a VHS type color-under carrier and an even track (channel Fig. 7d shows the relationship between the VHS type color-under carrier and the copper signal encoded in the odd track (channel), and Fig. 7e shows the encoding reproduced in the conventional VCR. FIG. 7F is a block diagram of a conventional color comb filter, FIG. 8 is a block diagram of a reproduction unit of a video recorder implemented according to the present invention, and FIG. 9 is shown in FIG. A detailed block diagram of a decoder of a reproducing section, FIG. 10A is a block diagram of an unfolding circuit of the decoder shown in FIG. 9, and FIG. 10B is an adaptive re-emphasis constituting a part of the unfolding circuit shown in FIG. Detailed 10c shows the re-emphasis / gain transfer function of the control signal generator of the adaptive re-emphasis circuit, 10d shows the folded signal and 10e or the unfolded signal. Fig. 10f shows the unfolded circuit of Fig. 10f with spatial filtering, Fig. 10g is a block diagram of the soft switch of the space-time post-filter circuit of the unfolding circuit in Fig. 10a, and Fig. 11a is the decoder of Fig. 9 Is a detailed block diagram of the color / copper signal separation circuit of Fig. 11b, which shows the coefficients of a digitally performed quadrant selection filter, which forms part of the color / copper signal separation circuit, and Fig. 11c is a diagram of the quadrant selection filter. FIG. 11D is a two-dimensional diagram taken from the horizontal center plane of the three-dimensional diagram of FIG. 11C, and FIG. 11E is a selectivity of the horizontal frequency response of the quadrant select filter.

The present invention is reduced in size so as to be suitable for transmitting and / or recording a wide bandwidth video signal through a narrow bandwidth video signal medium, whereby the information content of the wide bandwidth signal can be retained in the reduced bandwidth signal and reduced. The received bandwidth signal is received and / or reproduced and processed by the transmitted reduced bandwidth signal for processing into a bandwidth signal compatible with a conventional narrow bandwidth receiver, and for restoring the information content of the original wide bandwidth signal. The present invention relates to a video signal processing apparatus.

The present invention is particularly intended for converting a wide bandwidth input video signal into a reduced video signal that includes the content of the information of the input wideband video signal within the reduced bandwidth, whereby the reduced bandwidth video signal is applied to such a narrowband VCR. By processing the narrowband video signal, which can be recorded and reproduced conventionally, and reproduced to recover the contents of the information of the wideband video signal, the wideband video signal is thereby reproduced equivalent to the fullband input signal. A signal processing apparatus that can be applied to an improved wideband video cassette recorder (VCR), which can be restored to obtain an improved video bandwidth of a video signal, and conventionally records video cassettes recorded by such video signal processing apparatuses. Recorded for playback on mobile narrowband VCRs It relates to a device for maintaining a backward compatibility with small bandwidth video signal.

Conventional consumer VCRs record video information on a video tape cassette in one of several formats. Known VHS-type devices use a relatively narrowband type, and mainly produce a degraded picture quality compared to standard broadcast video, because recorded VHS-type video signals have insufficient horizontal resolution. Enhanced VHS-type recording devices, commonly called super VHS or S-VHS, use higher FM carrier frequencies for luminance information, resulting in improved picture quality by recording wider bandwidth video signals on videotape cassettes. And provide improved image resolution. This format requires a high FM carrier frequency, high quality tape in the cassette, high quality recording and playback mechanisms, heads and circuitry. However, S-VHS type is not backward compatible with standard VHS type VCRs. That is, although the S-VHS type VCR can play back cassettes recorded in S-VHS type or standard VHS type VCRs, the standard VHS type VCR cannot reproduce cassettes recorded in S-VHS type VCRs.

It has long been a goal for video engineers to increase the amount of information transmitted over certain narrowband channels, such as the NTSC signal channel, whose effective bandwidth is limited to nominal 4.2 MHz. Frame and line rates (time and vertical resolution) are generally fixed, and limiting bandwidth becomes limiting horizontal resolution. In some cases, the nominal bandwidth of the channel is limited to 3 MHz or 2.5 MHz, resulting in insufficient horizontal resolution in the image.

In scanned television devices, the signal energy is spectrally concentrated in the spatio-temporal domain in periods along the scanning frequency, and the video spectrum is called holes, i.e., the signal energy is very high. There are energy gaps between small discrete signal regions, which occur at regular intervals. NTSC composite color devices represent devices that use one of these 'holes' to convey color information. In an NTSC colorplexed color video apparatus, a signal, i.e., a color signal containing color information, is suppressed by a color difference or nominally suppressed 3.58 MHz subcarrier (i.e., phase quadrature). A pair of AM sidebands of a subcarrier are encoded with quadrature quadrature (i.e., two-phase) amplitude modulation and transmitted as baseband video. The carrier frequency 3.579545 MHz was carefully chosen by multiplying 227.5 by the horizontal scan frequency of 15.743 KHz, so minimal disturbance occurs when the color video signal is displayed at the black / white receiver. In particular, the NTSC color subcarrier frequency is interleaved temporally, vertically and horizontally in the luminance signal spectrum to minimize crosstalk and intermodulation between the luminance and color components of the composite video signal.

At the time of adopting NTSC colorplexed devices it was recognized that these frequency spectrum holes could be used to transmit additional horizontal information in order to increase the horizontal resolution of the reproduced image. In such devices, the high frequency horizontal information is spectrally interleaved with the low frequency horizontal information like the color information in the NTSC color device. Pages 127-136 of the paper REDUCTION OF TELEVISION BANDWIDTH BY FREQUENCY INTERLACE, published in February 1960 by Howson et al., Contain descriptions of devices that utilize analog signal processing techniques. However, the apparatus described herein cannot completely eliminate artifacts due to frequency interleaving, and thus cannot reproduce the full bandwidth image correctly in its original form, which represents do crawl patterns which should not be present. .

Later, sampled data digital video signal processing techniques are developed using sub-Nyquist sampling (sometimes called subsampling), which poses a problem. These techniques include replacing all radix samples of the first video line with '0' value samples and then replacing all even samples with '0' value samples in the next line. In the next frame, the pattern is reversed.

Advancement to German Patent No. 82100286.2, entitled "Verfahren zum ubertangen fernsehsignalen uber einen genormten bandbreitebegrenzten ubertragunskanal und anordnung zum Durchfuhren des Verfahrends," filed January 1, 1982 by Prof. Wendland and others. Discuss the principles of offset subsampling and bandwidth compression that are applied. This patent also discloses techniques for performing TV devices in accordance with the principles specified above.

Theoretically, the frequency folding technique and the sub-Nyquist sampling technique by the majority of the hawthorn are the same technique when the folding carrier frequency 'f _r ' is 1/2 of the sampling frequency 'f _s '. However, although theoretically the same, later, the sampled data digital device was provided with improved reproduction of the received image due to line and frame mixing techniques, which were not developed at the time of the Hawthorne system. However, the sub-Nyquist sampling technique has been developed for fully sampled data digital systems, such as data reduction (i.e., compression) techniques in digital systems, and the signals generated by the system can be used to narrow-band analog channels. Can not be transmitted.

In 1986, by Kojima et al., A report on consumer electronics based on IEEE 753-768, Volume CE-32, Vol. "Development" describes another data compression scheme that achieves bandwidth compression by sampling every frame every pixel. This design works well for nonmoving images. However, for moving images, a camellia is generated, and since the actual speed of sampling of each pixel changes adaptively according to the camellia, samples of the pixels are transmitted every other frame on average. In other words, the pixels are transmitted more often when they represent moving images.

US Patent No. 4,831,463, issued to Faroudja on May 16, 1989, discloses an apparatus for processing video signals, which transmits video information over a limited bandwidth channel, such as magnetic tape. In order to have a predetermined bandwidth. In the device specified in the above patent, the Youngsan signal pre-processor has a comb filter for generating a hole in the spectrum, as described above, between the spectral active areas within the rain signal spectrum. Include. Since the folding circuit folds the high frequency components of the baseband video luminance signal at a predetermined selected folding frequency, the aliases of the baseband luminance signal are located in the holes of the spectrum previously formed in the video signal. Thereafter, a lowpass filter filters the folded video signal, so that the bandwidth of the video signal is about one half of the original video signal bandwidth.

Moreover, Frauza's patent discloses a post-processor that receives a folded signal from a limited bandwidth channel. The post processor includes an unfolding circuit for unfolding the input signal near a predetermined unfolding frequency. The comb filter then processes the unfolded signal to remove alias components generated during the unfolding process. The signal generated by this comb filter is close to the original video signal in terms of bandwidth and information content.

It is important to note that the Hoson paper discusses two techniques of bandwidth reduction for video luminance signals, either by frequency interlacing or interleaving: In the first technique discussed, the video luminance signal spectrum is divided into two techniques. Separated into the same 1 / 2-bands (ie, band-separated at frequency 'f'), and the upper 1 / 2-band (ie, from frequency 'f' to high-frequency luminance frequency '2f') It is used to modulate the sub-carrier with the frequency set to be near the upper frequency limit of the standard video band, ie near '2f' The lower sideband of the modulator output is selected and the original lower term The resulting frequency interlaced signal, which is mixed with the 1 / 2-band, after mixing, contains information of all the original luminance signals except the 1 / 2-band of the original signal, thus transmitting over a channel of reduced bandwidth. To fit It becomes.

The second technique discussed by Hoson separates the main video luminance signal into two half-bands, and instead of only modulating the 'zf' sub-carrier into the high frequency half-bands. The entire main video (i.e., baseband) luminance signal is used to modulate the '2f' subcarrier. The lower band of the output signal of the modulator contains the interleaving signals needed for the correct frequency relationship with the main baseband video signal. If the output of the modulator is added to the main signal and the resulting additional signal is filtered through a lowpass filter having a cutoff frequency at about 1/2 sub-carrier frequency, then the lowpass filtered output signal is decompressed to the compressed subcarrier. The correct composite reduced bandwidth signal. Although the abstract presented in Hossen's paper raises some misconceptions that the first technique using band separation is employed, the Hoson concludes that the second technique is the same as that required by the first technique using band separation. It is indicated that there is no need to use a lowpass and bandpass filter, and this second technique is employed by Hoson in the experimental device described.

The folding / unfolding device described in the Frauja patent is similar in principle to Hoson's second technique. In the Hoson's device, the folding modulation subcarrier frequency is chosen at an odd multiple of the line scan frequency, while the sub-Nyquist sampling clock / or folding heterodyne applied to the multiplier used as a folding modulator in the Frauser's patent. The frequency of the resonator / mixer is selected from radix harmonics of 1 / 2-line refresh rate or radix harmonics of line and frame refresh rates, and in both devices, folding modulation is performed based on the baseband luminance signal, thus In addition, both devices necessarily require lowpass filtering after folding to remove frequencies greater than 1 / 2-folding frequency from the folded signal.

Both Hossen's paper and Frauer's patent describe folding devices, and if these folding devices are incorporated into an improved VCR, cassettes that can be played back in conventional VCRs without incurring serious artifacts in the displayed image are included. Can't produce That is, the recording of such folded video signals lacks backward compatibility with existing VCRs. This is mainly due to the amplitude of the folded luminance high frequency component in the spectrum of the low frequency component on the previously recorded cassette. The folded high frequency component is high enough to cause unacceptable artifacts and degradation (dot crawl, flicker, line picker, etc.) in an image display resulting from a video signal in which the folded high frequency components are not properly removed.

"Future TV" appears in pages 218-236 of the article "A Compatible High Fidelity Television Standard for Satellite Brodcasting" by Robson, September 1982. This paper includes filtering high frequency diagonal information to use certain gaps in the signal spectrum, and a three-dimensional sampling process for deliberately eliminating useful high frequency information into the gaps, performed by truncating the original signal spectrum. We propose an extended definition 'MAC' component type video signal device using. A post filter / interpolatro can be used to recover the folded energy to the correct high frequency position, whereby the one spectrum is recreated. This paper describes the need for pre and post-filtering to avoid aliasing in the displayed image. However, in conventional display devices without three-dimensional post-filtering, there will be high frequency Elia by-products, causing damage to the image.

The improved video recording apparatus can record wider bandwidth video signals than is recordable by conventional narrowband VCRs on a standard cassette, while still being backward compatible with conventional narrowband video signals, and in particular There is no need for high quality magnetic tapes or recording and reproducing methods. That is, narrowband wideband video cassettes of standard quality can be recorded using an improved apparatus for improving high frequency video information at wide bandwidth, even if a conventional VCR cannot reproduce a full bandwidth signal recorded on such a cassette. It can be reproduced with the compatibility by the conventional narrow bandwidth VCR without generating visually unpleasant artifacts in the reproduced image.

Hoson was not interested in the backward compatibility of interleaved signals, but instead minimized the effects of crosstalk from low-frequency luminance components and transmitting subcarrier interference at the receiver while transmitting the folded signal over the channel. And a pre-emphasis filter for boosting the interleaved high frequency components of the folded luminance signal. If a video cassette recorded by a VHS-type VCR tuned to include a device supported by the Hoson is played on a standard VHS-type VCR, due to interference of pre-emphasis high frequency components that are not removed, More unpleasant images will be produced than the reproduced images.

Frauja's patent does not indicate compatibility with existing recording media and devices that are one object of the patent invention. No indication is made by Frauer's patented device or method to achieve backward or backward compatibility with existing playback equipment. As explained above, the recording made by the apparatus as instructed by the Frauja patent is not backward compatible with existing playback devices because of the high level of luminance low frequency folded to luminance low frequency.

Thus, there is a need to improve the video resolution achievable by current limited bandwidth video recording and playback techniques, media, and techniques while having backward compatibility with existing VCRs and VCPs.

While the input wide-band full-resolution video signal can be transmitted and recorded as a limited-bandwidth video signal by a broadcaster or video recording over a limited-bandwidth medium, it still essentially produces visually objectionable artifacts of the information content of the input wideband signal. It is an object of the present invention to provide a video signal processing apparatus which is held in the form of a limited bandwidth signal which can be received or reproduced with compatibility by a conventional narrow bandwidth apparatus.

In order to receive or reproduce the transmitted or recorded limited bandwidth video signal, and to generate a full resolution video image from the signal, from the signal corresponding to the information of the input wideband video signal and a wideband video output signal containing the information It is another object of the present invention to provide a recoverable video signal processing apparatus.

In order to improve the resolution of video recording recorded and reproduced by a conventional narrow bandwidth video signal recording and reproducing apparatus without requiring a high quality recording and reproducing method or a recording medium, a conventional narrow bandwidth video signal recording and reproducing apparatus is employed. It is another object of the present invention to provide a video signal processing apparatus that can be used.

Provides a video recording apparatus capable of recording an input wideband video signal within a limited bandwidth so that the recorded limited bandwidth signal can be reproduced with compatibility by a conventional narrowband playback device, and from the recorded limitedband signal It is another object of the present invention to provide a video reproducing apparatus capable of reproducing such a recorded limited bandwidth signal in order to recover a wide bandwidth reproduced signal corresponding to the signal.

The input wideband video signal contains information of the intrinsic input wideband video signal in encoded form within substantially reduced bandwidth, and is compatible with conventional narrowband playback devices to play back video images without causing serious artifacts. And generate a wide bandwidth video signal corresponding to the input wide bandwidth video signal from the limited bandwidth video signal to generate a video image having a resolution equal to the input wide bandwidth video signal, which is encoded into a playable, limited bandwidth video signal. It is another object of the present invention to provide video signal processing techniques for decoding the proposed bandwidth video signal.

According to an aspect of the present invention, an input wideband video by appropriately processing the input wideband video signal to convert the input wideband video signal into a narrowband video signal while retaining the video information content of the input wideband video signal. A signal can be reduced in bandwidth to a narrow bandwidth video signal, and as a result, a video signal processing apparatus is provided in which the converted narrow bandwidth video signal can be recorded and reproduced through a narrow bandwidth recording medium.

According to another aspect of the present invention, an input wide bandwidth video signal is converted into a narrow bandwidth video signal while retaining video information contents of the input wide bandwidth video signal, and the converted narrow bandwidth video signal is recorded on a narrow bandwidth medium. The narrow-band video signal thus recorded carries the contents of the video information of the original input wide-band video signal, so that the recorded narrow-band signal is reproduced at a quality equivalent to that of conventional narrow bandwidth video recording. In order to provide a narrow bandwidth video image with compatibility, a video signal recording apparatus that can be reproduced with compatibility by a conventional narrow bandwidth reproducing apparatus is provided.

According to another aspect of the present invention, a control signal derived from an input video signal converts the input wide bandwidth video signal into a narrow bandwidth video signal while retaining the video information content of the input wide bandwidth video signal, and converts the converted narrow bandwidth. The video signal is recorded on a narrow bandwidth medium, thereby retaining the recorded narrow bandwidth video myth control signal as well as the content of the video information of the original input wide bandwidth video signal in a compatible encoded state, so that the artifact Without providing them, the conventional narrow bandwidth reproducing apparatus is compatible with the conventional narrow bandwidth reproducing apparatus to provide a compatible narrow bandwidth video image in which the recorded narrow bandwidth signal is reproduced at a quality equivalent to that of a conventional narrow bandwidth video recording. There is provided a video signal recording and reproducing apparatus, which can be reproduced. Device processes according to the restored the reproduced narrow bandwidth signal to the bandwidth control signal to recover the video signal corresponding to the narrow-bandwidth video signal and play back, the original input-bandwidth video signal is recorded from the recording medium.

According to the invention, the full bandwidth input video signal is conveyed through an encoder which generates an encoded reduced bandwidth video signal having a limited bandwidth low frequency luminance component (where the de-emphasized amplitude high frequency luminance component is folded into this component). . Encoded video signals generated by the encoder according to the present invention can be output on a narrow bandwidth video medium or channel, for example, recorded on a conventional narrow bandwidth magnetic medium such as a VHS type video cassette.

When played back by a VCR implemented by the present invention, the reproduced narrow bandwidth encoded video signal is passed through a decoder, where the folded de-emphasis amplitude high frequency luminance component is unfolded and amplitude re-emphasis. Reproduced folding high frequency luminance when the video signal of the full bandwidth is recovered while being reproduced by a conventional narrow bandwidth VCR which is unable to unfold and recover the recorded folding luminance high frequency component. The component is at a sufficiently low frequency level by the de-emphasis performed during the encoding process of the present invention, and there is no interference which would not be present in the reproduced narrow-bandwidth video image, thus, with conventional narrow-bandwidth VCRs. It provides backward playback compatibility of encoded recordings.

The video recording and reproducing apparatus according to the present invention is adapted to generate an encoded video bandwidth-limited luminance component signal from which the high frequency luminance components of the input wide bandwidth video signal are folded into the spectral bandwidth of the low frequency luminance components. Low and high frequency luminance components and color components, including the color components of the input wideband video signal together with the dynamic expression signal derived from, to generate an encoded color / motion signal for use in the dynamic adaptation of the input video signal at the encoder. Partially executed by an encoder for receiving and appropriately processing a wideband baseband video input signal comprising a baseband luminance component having a baseband luma component, thereby limiting and compressing to a narrow bandwidth relative to the bandwidth of the original input video signal. Encoded video with bandwidth For generating an input signal the other hand, still it is possible to hold the detailed information of the high-frequency luminance of the original input video signal. Thus, the encoded luminance and color / motion signals suitable for the narrow bandwidth video channel or medium from the encoder can be advantageously recorded on the narrow bandwidth video tape by a conventional narrow bandwidth type VCR recording apparatus.

The encoding process according to the present invention generates severe noise, interference, or artifacts in a video image in which a high frequency component folded into a band-limited signal is displayed when the recorded band-limited signal is reproduced by a conventional narrow bandwidth type VCR or VCP. To ensure that it will not, adaptively control the magnitude of the high frequency luminance component to an appropriate level during the folding operation, thereby improving the conventional narrow bandwidth VCRs and VCPs and the processing processed according to the present invention. Backward compatibility with recorded records is ensured.

Hoson's technique in which the high-frequency components of the luminance signal are amplitude boosted by a pre-emphasis process, and the technique described by both Hoson and Fraser, where the baseband luminance signal is folded without any amplitude adjustment, In comparison, the encoding process according to the present invention separates the baseband luminance signal into high and low frequency components (out of Hoson's interest) as described, and then the high frequency components of the luminance signal during the folding operation De-emphasis is a degree of de-emphasis that is controlled by the energy measured in the signal. As a result, the folded high-frequency luminance component in the encoded band-limited luminance signal results in an encoded band-limited video signal. When played back by conventional video narrowband playback devices, there will be no significant interference or noise in the displayed image, and so on This provides backward compatibility with existing video narrow bandwidth playback devices and encoded band-limited video signals.

De-emphasis of the high frequency luminance components of the folded band-limited video signal can be performed in a variety of ways, for example in a predetermined manner. However, the inventors of the present invention find it particularly advantageous to apply adaptive de-emphasis to high frequency luminance components, whereby such high frequency luminance components (most of which are conventional narrow video bandwidth reproduction) in folded band-limited signals. Components that tend to cause significant noise or interference in the displayed video image when played back by the device), e.g., high-amplitude-high-frequency luminance components are more de-emphasized, while folded band-limiting High frequencies that are less prone to noise and interference in narrowband reproduction in signals and, if largely de-emphasized, can cause significant noise degradation in the displayed wideband video image when reproduced by an optical bandwidth playback device. Luminance components, e.g. low amplitude-high frequency luminance components, de-emphasis to a lesser extent Or not change will be transmitted. This adaptive de-emphasis technique provides backward compatibility with the encoded band-limited video signal, and also has the advantage of protecting the picture quality of the reproduced wideband video signal. Thus, high brightness de-emphasis is performed adaptively and advantageously according to the invention during the folding operation in the encoder.

Moreover, since the folding process performed on the baseband luminance signal causes unnecessary upper sideband components, the preceding baseband folding apparatus described in Hoson's paper and Frauer's patent, which need to perform lowpass filtering of the luminance signal after folding, In comparison, in the encoding process according to the present invention, the luminance signal is band-separated prior to the de-emphasis process and the folding, and the folding operation is performed directly on the high frequency luminance component signal by a sampling technique, whereby the folded To generate a band-limited folding luminance signal without the need to low pass filter the luminance signal, the folded de-emphasis high band luminance signal is band-shifted into the low band frequency spectrum and then only mixed with the low band luminance signal. . Alternatively, the present invention allows the folding to be performed at the base bend in combination with de-emphasis of luminance high frequency.

For example, it is already known to apply different processing, such as different types of filtering, to video signals that depend on certain factors, such as the degree of agreement in a video image. For example, one type of filtering is more suitable for portions of the video image signal that have no copper or only a small amount of copper, while the other type of filtering is more suitable for portions of the video image signal that have a high degree of agreement. The signal is generated by analyzing the video image signal to determine the degree of motion occurring in the video image, which is then applied appropriately to different filters depending on the degree of motion in the video image. It is used to control the switch. The signal can, for example, control a soft switch at the outputs of the different filters, so that the amount of signal filtered from the different filters provided at the output can be controlled in accordance with the agreement of each part of the video image. have.

According to another aspect of the invention, the encoder generates a dynamic expression signal to be derived from the input wideband video signal and utilizes this dynamic expression signal to achieve dynamic adaptive space-time filtering of the video signal during the encoding process. In addition, the generated dynamic signal can be advantageously used in the decoding process to perform a corresponding dynamic adaptation of the reproduced video signal, so that it is recovered at the time of playback and is used to recover the wideband video signal from the encoded band-limited video signal. In a way that can be utilized in itself, it is properly encoded into a band-limited video signal. However, the encoding of such a copper signal into an encoded band-limited video signal should not generate noise or interference when reproducing the encoded band-limited video signal by conventional narrowband playback devices. Therefore, according to another aspect of the present invention, the signal can be advantageously encoded into a vacant portion of the video signal spectrum that does not affect narrowband reproduction, and is compatible with existing narrowband reproduction apparatus. In implementing the apparatus of the present invention on a conventional VHS type, according to another aspect of the present invention, in a manner in which encoded band-limited video recording can be reproduced with compatibility without interference by a conventional VHS type VCR, This is advantageously achieved by properly encoding the moving signal into the empty areas of the VHS type color-under signal, which allows the improved VCR according to the present invention to derive the encoded moving signal by the decoding process on the reproduction side.

In addition, the video recording and reproducing apparatus according to the present invention unfolds and restores the high frequency luminance components encoded in the band-limited video signal, and the raw input video by a bandwidth-extension reconstruction process including an unfolding of the folded signal. To recover the wide bandwidth of the signal, it may be partially implemented by a decoder to process the encoded band-limited video and to perform co-adaptive filtering of the unfolded signal.

According to another aspect of the present invention, the decoder performs a re-emphasis process of the reproduced unfolding high frequency luminance components and then mixes them with the reproduced low frequency luminance components to restore the original amplitude. A wideband video signal can be built and a wideband video picture can be reproduced from the reconstructed wideband video signal. In the case where the de-emphasis process is adaptively performed during encoding, the re-emphasis process also encodes to realize a more faithful reconstruction of the amplitude relationship of the high frequency luminance components in the unfolded wideband video signal. It is adaptively performed as a transfer function which is the inverse of the function used during the de-emphasis process on the side.

The decoder also recovers the encoded copper signal from the encoded band-limited video signal, which can be utilized in the decoding process. According to another aspect of the present invention, when performed for use with the conventional VHS type, the encoded copper signal, which was previously mixed with the color components of the video signal together with the color components of the video signal during the encoding process at the decoder, is the color signal during the decoding process. Separated from the components.

Advantages and other features of the present invention will be described in more detail below in conjunction with the accompanying drawings.

The apparatus of the present invention may be implemented using analog and / or digital signal processing techniques. As an example, the implementation of the apparatus according to the invention will next be described using digital signal processing. However, what is described herein may be practiced by those skilled in the art using analog techniques, and how it will be readily understood.

In the figures, equalization delays have been omitted for simplicity. Those skilled in the art of designing a video signal processor are required to properly align pixels that require different delays in different processing paths where different processing is performed. Will admit it is necessary. Those skilled in the art will understand where these delays are needed and how long they should be, and thus will not be described or discussed.

In addition, in the figures, various filters having both highpass and lowpass response characteristics are used to filter in the horizontal, vertical and time directions. Those skilled in the video signal processor design art have recognized that some of these filters can be made with known comb filter designs, and how the delay period of each delay line, the weight of multiple tapes and tapes, I will understand how to make the appropriate choice. As a result, the detailed design of these comb filters will not be discussed here, and this detailed design is not important for other reasons as well. Moreover, A / D and D / A converters are shown and described in the present invention, and those of ordinary skill in the art will appreciate that such converters may be used for the antialiasing or sampling clock cancellation lowpass filters, It will be understood later that each of these transducers may come advantageously and how this will be done and will not be described in further detail here.

Further, in the drawings and the following detailed description, various embodiments constructed by the present invention relate to NTSC composite video baseband signals. Those skilled in the art will understand that modifications to the embodiments are required to process PAL video signals, SCEAM video signals or video signals according to some other standard. Such embodiments may still be constructed in accordance with the principles of the present invention.

1 is a block diagram illustrating a portion of a video signal recorder in accordance with the principles of the present invention. In Fig. 1, the input terminal 5 is connected to a source of a video signal, for example an NTSC composite video signal. The input terminal 5 is connected to the input terminal of the encoder 10. The first output terminal of the encoder 10 is connected to the input terminal of the luminance recording circuit 20 similarly as in conventional VCRs. The output terminal of the luminance recording circuit 20 is connected to the recording head 40 of the standard tape transmission device similarly to the conventional VCRs. The second output terminal of the encoder 10 is connected to the input terminal of the color recording circuit 30 similarly as in the conventional VCR. The output terminal of the color recording circuit 30 is also connected to the recording head 40. The recording head 40 records the applied signals on the magnetic tape of the standard video cassette (not shown) by the luminance and color recording circuits 20 and 30.

In operation, the encoder 10 takes a standard full-bandwidth composite NTSC video signal and has a reduced bandwidth equal to the standard luminance signal generated by a conventional narrowband VCR, but folded into its spectrum. Generate an encoded luminance signal L _r having a perturbed high frequency component. Thus, the encoded luminance signal L _r contains all the luminance information from the full-bandwidth NTSC input luminance signal within a reduced bandwidth that can be recorded on the magnetic media of the videotape cassette, thus, of standard quality. Cassettes and recording and playback devices can be used. In addition, in the encoded recording, the reduced amplitude of the folded high frequency luminance component will not cause serious artifacts in the displayed image if the recorded cassette is later played back in the standard narrow bandwidth VCR. The luminance signal recording circuit 20 records the encoded luminance signal L _r in a manner almost the same as that in which the limited bandwidth (i.e. narrow band) luminance signal is normally recorded in the standard VCR. In the conventional VHS type VCR recording circuit, for example, the separated NTSC luminance signal is frequency modulated onto a luminance carrier whose frequency can be changed between about 3.4-4.44 MHz (± 0.1 MHz), and the side of 1.2 MHz or less. After filtering to remove the band, it occupies a frequency band around 1.2-7 MHz.

The encoder 10 generates a composite color / motion signal C + Mr applied to the color recording circuit 30. Such a composite signal includes a signal of standard color information of an input NTSC composite video signal as one component and a dynamic expression signal as another component.

As will be explained in more detail below, in the processing of the recording side executed by the decoder 10 of FIG. 1, the dynamic expression signal M is developed by analyzing the motion of the image in the input video signal. It may advantageously act as a control signal for co-adapting the video luminance components of the input video signal prior to folding. In reproduction, the use of the same dynamic expression signal M utilized during the luminance processing on the recording side can facilitate the processing of the luminance during the recovery process, so that the dynamic expression signal M records the composite color / copper signal C + M _r . In order to provide to the color recording circuit 30 for a video signal, the encoder is additionally processed in the encoder to mix the dynamic expression signal M with the video color component signal C. The description of the encoding and decoding of the dynamic expression signal M will be described in more detail next.

The luminance recording circuit 30 records the color / motion signal C + M _r in a manner almost identical to that of the conventional color signal in the standard VCR. For a VHS type VCR, for example, the 3.58 MHz NTSC color subcarrier frequency is down-heterodyed, i.e., down-converted at about 629 KHz to provide a color-under carrier. According to the performance of the encoder of the present invention for the standard VHS VCR type described in more detail below, the composite color / motion signal C + M _r is modulated in the color-under-carrier and is coupled to the recording head 40 together with the luminance signal L _r . It is applied and recorded by the recording head 40 on the cassette's video tape in a conventional manner. For those of ordinary skill in the art related to index coding and decoding according to the present invention, the NTSC color carrier is a two-line sequence and has a phase difference of 180 with other lines, while the color-under color carrier is 4- It will be readily understood that it is a line sequence and has a phase difference of 90 ° per line due to the advancing and retarding of other tracks.

FIG. 2 is a more detailed block diagram than the encoder 10 shown in FIG. In FIG. 2, the input terminal 105 corresponds to the input terminal 5 of FIG. In order to facilitate signal processing, digital signal processing techniques can be advantageously implemented, and the input terminal 105 is an analog-to-digital converter (A / D) 102 which generates a digitized composite video output signal V. It is connected to the input terminal of. The output terminal of the A / D 102 is connected to the respective input terminals of the adaptive luminance signal separator 104, the dynamic signal generator 106, and the color signal separator 114. The output terminal of the adaptive luminance signal separator 104 is connected to the input terminal of the folding circuit 108. As will be described in more detail below, the folding circuit 108 demultiplexes the folding carrier into the low-frequency luminance component spectrum to fold the bands of the luminance signal separated from the luminance separator 104 into the low-frequency luminance component spectrum. The folding carrier is decomposed to separate the processed high-frequency luminance components, to perform an applied de-emphasis process of the high-frequency gray component, and to fold an adaptive de-emphasized high-frequency gray component into a low-frequency gray component spectrum. Modulate with an emulated high frequency luminance component, add the folded adaptive de-emphasis high frequency luminance component to the low frequency luminance component, thereby providing a bandwidth-limited luminance signal L _r .

The output terminal of the folding circuit 108 is connected to the input terminal of the D / A converter 110 in which the digital polling luminance signal L _f is converted into an analog signal L _r suitable for conventional analog recording. The output terminal of the D / A converter 110 is connected to the first output terminal 115 of the encoder 10 which is applied for recording the analog luminance signal L _r . The output terminal 115 is connected to the input terminal of the luminance recording circuit 20 of FIG.

The dynamic expression signal output terminal of the dynamic signal generator 106 is connected to the control input terminal of the adaptive luminance signal separator 104 and the dynamic signal input terminal of the color / motion signal mixing circuit 116. The separated color signal output terminal of the color signal separator 114 is connected to the color signal input terminal of the color / motion signal mixing circuit 116. The color / copper signal C + M output by the color / copper signal mixing circuit 116 is connected to the input terminal of the second D / A converter which outputs the analog color / copper signal C + Mr. The output terminal of the D / A 118 is connected to the second output terminal 125 of the encoder 10. The output terminal 125 connects the analog color / copper signal C + Mr to the input terminal of the color recording circuit 30 of FIG. 1 for recording on the magnetic tape of the video cassette.

In operation, the encoder 10 of FIG. 2 first converts the composite video signal at the input terminal 105 into a data multi-bit digital composite video signal V sampled using the A / D 102. For NTSC signals with a nominal bandwidth of about DC-4.2 MHz, for example, the sampling frequency may be selected at about 10 MHz. The digital composite video signal V is applied to the adaptive luminance signal separator 104, and the adaptive luminance signal separator 104 separates the luminance component L from the digital composite video signal V and performs dynamic adaptive space-time filtering of the separated luminance signal. . The digital composite video signal V is also a dynamic signal generator 106 which obtains a dynamic expression signal M (hereinafter referred to as the dynamic signal M) from the digital composite video signal V for controlling dynamic filtering at the encoder side or the decoder side. Is applied to. The digital composite video signal V is also applied to the color signal separator 114 for deriving the color signal C.

The derived luminance signal L is further processed by the folding circuit 108. This circuit folds the adaptive de-emphasized high frequency component of the luminance signal L into the bandwidth of the low frequency luminance component, so that all information of the full bandwidth baseband luminance signal L is reduced to, for example, about 2.5 HMz. It is included in the folded luminance signal L _f having a bandwidth. The adaptive folding circuit 108 will be described in more detail next. The folded luminance signal L ^r is converted into an analog signal L _r by the D / A converter 110. This signal is in a form that can normally be recorded on a video cassette by the luminance recording circuit 20 and the recording head 40 of FIG.

The derived copper signal M and the derived color component signal C are mixed into a single complex color / motion signal C + M in the color / motion signal mixing circuit 116. The prior art US patent application Ser. No. 07 / 531,070 filed May 31, 1990, which is co-pending, which may be used as the color / copper signal mixing circuit 116 is described in more detail. Furthermore, in the case of adjusting to be compatible with the conventional VHS type video cassette recording and reproducing, in order to carry out a more particular advantage of the present invention, by encoding the same signal with color component signals recorded in the VHS type with compatibility Color component processing, recording and reproduction agreements in accordance with the standard VHS type can be concluded as described in more detail below.

The color / motion signal C + M may be changed into the analog signal C + R _r by the D / A 118. This signal is in a form that can be recorded on the video cassette by the standard color recording circuit 30 and the recording head 40 of FIG.

As is well known in video signal processing techniques, frame comb lowpass filtering (temporal lowpass filtering) can be used to derive luminance components from composite video signals without loss of spatial resolution. However, when copper is present in the video image, serious artifacts are generated in the frame comb derived luminance signal. Line comb lowpass filtering (vertical comb lowpass filtering or spatial lowpass filtering) can be used to derive the luminance components even when copper is present. However, the luminance component derived by the line comb low pass filtering reduces the spatial resolution. In order to maintain the spatial resolution, it is preferable to derive the luminance signal using frame comb filtering, and if there is no copper in the region of the image, it is preferable to use line comb filtering in the region.

3 is a block diagram illustrating a part of the encoder 10 shown in FIG. 2 in more detail. In FIG. 3, the input terminal 205 is connected to the output terminal of the A / D converter 102 of FIG. The input terminal 205 is connected to each input terminal of the vertical high pass filter (VHPF) 202, the time high pass filter (THPF) 204, the horizontal band pass filter (HBPF) 206, and the subtractors 208. ) And (210) for each of the monitored input terminals. The output terminal of the VHPF 202 is connected to the input terminal of a horizontal high pass filter (HHPF) 212 having a cutoff frequency selected, for example, at 1.7 MHz. The output terminal of the horizontal high pass filter (HHPF) 212 is connected to the subtractive input terminal of the subtractor 208. The output terminal of the subtractor 208 is connected to the input terminal of the horizontal low pass filter (HLPF) 209. The output terminal of the horizontal low pass filter (HLPF) 209 is connected to the first data input terminal of the soft switch 214. The output terminal of the soft switch 214 is connected to the output terminal 215. The output terminal 215 is connected to the input terminal of the folding circuit 108 of FIG.

The output terminal of the THPF 204 is connected to the input terminal of the horizontal high pass filter (HHPF) 216 and the subtracted input terminal of the subtractor 218. The output terminal of HHPF 216 is connected to each subtractive input terminal of subtractor 210,218. The output terminal of the subtractor 210 is connected to the second data input terminal of the soft switch 214.

The output terminal of the subtractor 218 is connected to the input terminal of the signal magnitude detector 220. The output terminal of the magnitude detector 220 is connected to the input terminal of the signal spreader 222. The output terminal of the signal spreader 222 is connected to the output terminal 225 and the control input terminal of the soft switch 214. The output terminal 225 is connected to the copper signal input terminal of the color / copper signal mixing circuit 116 of FIG.

The output terminal of the HBPF 206 is connected to the input terminal of the crosstalk prevention processor 224 for processing color components prior to mixing with the same signal. The output terminal of the crosstalk prevention processor 224 is connected to the input terminal of the color signal modulator 226 which forms part of the color / copper signal mixing circuit 116 of FIG.

The horizontal and vertical highpass filtered signal HV _hp generated by the VHPF 202 and HHPF 212 connected in series includes all the color information present in the composite video signal V as well as all the detailed spatial information. This signal HV _hp is subtracted from the composite video signal by the difference of the subtractor 208 to generate a diagonal lowpass filtered signal HV _IP containing only luminance information. The output signal HV _IP from the subtractor 208 is spatially recovered during the playback process, for example, by removing horizontal frequency spectrum components above 3.3 MHz from the HV _IP , as described in detail later with reference to FIG. In order to avoid aliasing noise in the luminance signal, it is applied by the HLPF 209 having a cutoff frequency of 3.3 MHz, thereby providing the spatially derived luminance signal L _s to the output terminal of the HLPF 209. The luminance signal L _S derived spatially by the HLPF 209 only contains luminance information, but has a reduced diagonal resolution.

The time and horizontal highpass filtered signal HT _hp generated by the THPF 204 and HHPF 216 connected in series will contain all the color information present in the composite video signal V as well as most detailed time information. . This signal HT _hp is subtracted from the composite video signal by the difference of the subtractor 210 to generate the luminance signal L _r derived in time. The temporally derived luminance signal L _r generated by the subtractor 210 includes only the luminance signal of full-space resolution, but has a reduced temporal resolution.

The signal T _hp temporally highpass filtered from the THPF 204 includes dynamic information of horizontal low frequency and color information of horizontal high frequency. Thus, the output signal HT _hp from the HHPF 216 is subtracted to derive a horizontal high pass-filtered and time high pass-filtered signal H _IP T _hp which is a bipolar motion representative signal. Is subtracted from the temporal highpass filtered signal Y _hp by 218. The signal H _IP T _hp changes in magnitude as a function of synonym magnitude in the image (i.e. the greater the degree of agreement in the image, the greater the signal magnitude) and the contrast of the dynamic and static regions of the image. The signal H _IP T _hp has the largest magnitude at the edge of the moving object with high contrast against the background. Where the intensity of the moving object is similar to the background, the dynamic expression signal H _IP T _hp has a low magnitude. In addition, fast moving objects with soft edges also generate low magnitude motion signals. As a result, the dynamic expression signal H _IP T _hp of fast moving objects with high comparison is generally strong only within a few pixels of the edge of the moving object.

In order to minimize the effect of this variation in the derived dynamic expression signal H _IP T _hp , the magnitude detector 220 detects the magnitude of the dynamic expression signal H _IP T _hp from the subtractor 218 and checks whether there is no copper in the corresponding pixel. Generate a single bit signal to indicate. The known magnitude detector 220 includes a multiplexer having a control input terminal responsive to a single bit signal of an applied dynamic expression signal H _IP T _hp . The kinematic signal H _IP T _hp will be connected to the first input terminal of the multiplexer and the input terminal of the arithmetic inverter. The output terminal of the arithmetic inverter will be connected to the second input terminal of the multiplexer. The output terminal of the multiplexer generates the magnitude (absolute value) of the dynamic expression signal H _IP T _hp . If the single bit signal is logical " 0 ", the dynamic expression signal value is a positive value, and then the multiplexer connects the first input terminal for transmitting the dynamic expression signal H _IP T _hp to the output terminal. If the single bit signal is logical " 1 ", the dynamic expression value is negative, and then the multiplexer transmits a negative number of the dynamic expression signal H _IP T _hp (which may be a positive signal) from the inverter. Connect the second input terminal to the output terminal.

This magnitude signal is then applied to known comparator circuits. The comparator circuit compares the magnitude signal with a predetermined threshold value. If the magnitude exceeds the threshold, then the comparator circuit generates an output signal of logic " 1. " If the magnitude is smaller than the threshold value, then the comparator circuit generates an output signal of logic " 0 ". The output of such a comparator is a single bit dynamic expression signal which is logic "1" when copper is present and logic "0" when copper is absent.

The single bit dynamic expression signal is spread vertically and horizontally by the signal spreader 222 to generate a spread dynamic signal M. Optionally, the signal can be spread out temporally, vertically and horizontally by the signal spreader 222. An apparatus for spreading such a single bit dynamic expression signal is described in detail in US Patent Serial No. 531,057, filed May 31, 1990, co-pending. The spreading copper signal M generated by the signal spreader 222 is vertical and horizontal directions (and the value is from the highest value of the dynamic region (indicated by a single-bit two-level signal having a logical "1" value). Optionally, it is a multi-bit digital signal which gradually decreases to a minimum value 0 of the moving area near the moving area. This spread motion signal M is used in the encoder 10 for adaptively processing the video signal V as described below. This spread copper signal M is recordable, reproducible, and is interchangeably encoded to be recovered and utilized by the decoder as described in more detail below.

As described above, the luminance signal L is a temporally derived luminance signal L _r when there is no copper in the image, and when there is copper, the luminance signal L is a spatially derived luminance signal L _s . The soft switch 214 continuously changes the ratio of the two input signals L _r and L _s that can be connected to the luminance signal L output terminal 215 in accordance with the value of the same signal M. If the value of the copper signal M is " 0 " or almost " 0 ", it indicates that there is no copper or less copper, at which time the soft switch generates an output signal L composed of the luminance input signal L _r derived completely in time. If the value of the moving signal M is at or near the highest value, it indicates a high synonymous level, at which time the soft switch 214 generates an output signal L composed of the luminance signal L _s derived completely spatially. At the median of the moving signal M, the output signal contains some proportion of each of the input signals L _r , L _s . The operation of the soft switch 214 will be described in more detail next.

NTSC color components are derived from composite video signal V in a known manner using horizontal BPF 206. A color component signal (modulated with a 3.58 MHz NTSC color subcarrier) separated from the horizontal BPF 206 is processed by the crosstalk prevention processor 224 to prevent crosstalk, and then the color of the color / motion signal mixing circuit 116. It is applied as a color signal to the input terminal of the modulator 226, and is heterogeneous by a known method, for example, heterodyning a 3.58 MHz NTSC color subcarrier for a 4.21 MHz four-phase carrier, and modulating onto a 629 KHz carrier wave. To be frequency downconverted by the color signal modulator 226 for VHS type recording, for example, 629 KHz color-under signal, by way of passing the lower resulting sidebands to provide a color-under color component signal amplitude. Is processed. Thus, the color component signal frequency down-converted from the modulator 226 is first processed by the crosstalk prevention element 224 to reduce crosstalk of adjacent lines with the same signal M in the composite color / motion signal C + M. The crosstalk prevention element 224 may be, for example, a vertical highpass filter (VHPF), which may be implemented as a three-tap line comb lowpass filter. Optionally, vertical filtering of the composite video signal V precedes horizontal bandpass filtering by the horizontal BPF 206 in the color separation step. In FIG. 3, both VHPF 202 and THPF 204 respond to the composite video signal V. In FIG. Since the filters are implemented as comb filters, they can share delays.

3 illustrates a portion of an encoder 10 that is mainly applied for processing NTSC video signals. Those skilled in the art will understand how to configure the encoder 10 of the present invention to process PAL video signals, SECAM video signals or video signals conforming to other standards. FIG. 4 shows in detail the configuration (sharing delay lines whenever possible) which is more effectively configured by the luminance component separator, the spatial and temporal filtering unit, and the representation signal generator of FIG.

In FIG. 4, the same elements as in the third figure use the same reference numerals and are not described any further. In FIG. 4, the input terminal 305 is connected to the output terminal of the A / D converter 102 of FIG. The input terminal 305 is connected to the input of the VHPF 202, connected to the subtracted input terminal of the subtractor 208, connected to the subtracted input terminal of the adder 210, and the input is weighted by 1/2. A subtractor 306 is connected to the subtracted input terminal and is connected to the input terminal of the 1-frame delay device 312. The delay unit 312 generates a signal that is delayed by one frame to the output terminal (a signal whose delay is applied by the same period as the input terminal of the delay unit, the applied signal V being one frame scan period). The output terminal of the 1-frame delay device 312 is connected to the subtractive input terminal of the weight subtractor 306 whose input value is weighted by 1/2. The combination of the one frame delay device 312 and the weight subtractor 318 forms a THPF 204 that is configured as a frame highpass comb filter of known design that generates a highpass filtered output signal T _hp in time.

The output terminal of the VHPF 202 is connected to the input terminal of the HHPF, and the derivation process of the spatially derived luminance signal L _s is as described above in connection with the third degree.

The output terminal of the subtractor 218 is connected to the magnitude detector 220, the horizontal diffuser 318, and the vertical diffuser 320 connected in series. The combination of the horizontal diffuser 318 and the vertical diffuser 320 constitute the copper signal diffuser 222 of FIG. 3 and operate as described above.

Parts not described in the block diagram of FIG. 4 have been described above as being identical to those described in FIG. It will be understood that FIG. 4 is not intended to show timing accuracy and timing matching. That is, FIG. 4 does not show any delay lines used to equalize delays along each signal path to maintain pixel interrelationships. Those skilled in the signal processing art will understand that there is a need to make a timing match, and will also know various ways to perform such a match and, therefore, need not be described further herein.

Horizontal HPFs 212 and 216 may be standard digital highpass filters, each having a break frequency near 2 MHz. A 15-tap horizontal highpass filter with a 6dB response at 1.75MHz is selected. For example, in spatial diagonal pre-filtering performed at the encoder prior to folding and diagonal post-filtering after folding, the diagonal filters at the encoder and decoder are very well coordinated, as described below, in each filtering process. The input signal is vertically highpass filtered, and the portion of the vertically highpass filtered signal is horizontally highpass filtered near 1.7 MHz, resulting from the input signal to provide a diagonally lowpass filtered output signal. The signal is then subtracted and then horizontally lowpass filtered (e.g., as shown in FIG. 10) near 3.3 MHz to generate a spatially derived luminance signal.

5 is a more detailed block diagram of the soft switch 214 described in FIG. The soft switch 214 is utilized for co-adaptive processing of the luminance signals L _r and L _s derived temporally and spatially. In FIG. 5, the first signal input terminal of the soft switch 214 is connected to the output terminal of the subtractor 210 of FIG. 3 to receive the luminance signal L _r derived in time. The input terminal 405 is connected to the first input terminal of the multiplication 404. The output terminal of the multiplier 404 is connected to the first input terminal of the adder 412. The output terminal of the adder 412 is connected to the output terminal 435. The output terminal 435 is connected to the folding circuit 108 of FIG.

The second signal input terminal 415 of the soft switch 214 is connected to the output terminal of the subtractor 208 of FIG. 3 in order to receive the spatially derived luminance signal L _s . The input terminal 415 is connected to the first input terminal of the multiplier 408. The output terminal of multiplier 408 is connected to the first input terminal of adder 408. The control input terminal 425 of the soft switch 214 is connected to the diffusion copper signal M output terminal of the signal spreader 222 of FIG. The input terminal 425 is connected to the input terminal of the look-up table 410. The first scaling factor output terminal K of the look-up table 410 is connected to the second input terminal of the multiplier 404 and the second scaling factor output terminal 1-K of the look-up table 410 is connected. Is connected to the second input terminal of the multiplier 408.

In operation, multiplier 404 scales the luminance signal temporally derived by scaling factor K, and multiplier 408 scales the spatially derived luminance signal by scaling factor 1-K. Adder 412 adds the scaled output signals of multipliers 404 and 408 to generate a dynamic-adaptive space-time filtered separated luminance signal L.

The spread copper signal M from the input terminal 425 is applied to the input of the look-up table 410. The look-up table generates two scaling factors K, 1-K related to the value of the control signal M. The first scaling factor K is the ratio of the luminance signal L _r derived in time from the luminance output signal L. The second scaling factor 1-K is the ratio of the luminance signal L _s spatially derived from the dynamic adaptive luminance output signal L. The sum of K and 1-K is one. The dynamic-adaptive spatiotemporal luminance signal processing function K (M) is when M is "0" or nearly "0" (corresponding to a low synonym level in the luminance component), where K is "1" (the luminance signal derived in time). , 1-K is "0" (no spatially derived signal), and when M is at or near peak (corresponding to a high agreement level in luminance component), K is "0" (temporally derived luminance). Component-free), and 1-K is a function of "1" (the total spatially derived luminance signal). The function K (M) may be continuous, linear or nonlinear. As the value of the dynamic signal M gradually changes from " 0 " to " maximum ", the ratio of the luminance signal L _r derived in time from the luminance output signal L gradually decreases, and is spatially derived from the luminance output signal L. The ratio of the luminance signal L _s gradually increases, and vice versa.

The look-up table 410 is implemented in a known manner using a multi-bit ROM (ROM) having a spread copper signal M input terminal 425 coupled to the address input terminals. The first part of the data output terminals of the look-up table is connected to the K signal input terminal of the multiplier 404 and the second part is connected to the 1-K signal input terminal of the multiplier 408.

The storage locations of the ROM of the look-up table 410 are accessed by the same signal M at the address input terminals, where each separate value of the same signal M has access to a different storage location of the ROM. Can be. Each storage location is a first data part (connected to the first part of the data output terminals) preprogrammed with a K value corresponding to the M value accessing the location, and 1-K corresponding to the value of the same signal M. Store a second data portion preprogrammed with a value (connected to the second portion of the data output terminals).

Next, the de-emphasis and folding process according to the present invention will be described. In the preceding luminance signal folding device as described above, the luminance high frequency is in the luminance low frequency spectral band of the original amplitude (or boosted to a larger amplitude if pre-emphasized as proposed by Hoson). Folding back If the folded luminance signals are recorded and then reproduced in a conventional narrow bandwidth VCR which is not equipped with a facility for removing the folded luminance high frequency aliases, very serious artifacts will exist in the reproduced image. Video recording with backward compatibility with playback devices becomes impossible.

The inventors of the present invention properly de-emphasize the high frequency luminance components folded in a band-limited folding operation during the decoder side processing, thereby reproducing the band-limited folding luminance signal of a video tape with a conventional narrowband playback device. Therefore, the artifacts in the reproduced video image are reduced to a point that does not cause a problem in time, and it provides a desirable backward compatibility with the existing playback apparatus.

In the aforementioned co-pending prior US Pat. Nos. 569,029, Serial No. 604,493, Serial No. 604,494, and Serial No. 635,197, the method for the recovery of de-peaked high frequency luminance components on the reproduction side Utilizes a thresholding type of de-emphasis or de-peaking of high-frequency luminance components at the recording side with peaked re-emphasis, utilizes coring operations, and scales control Luminescent folding / unfolding devices are proposed which activate a scaling operation controlled by a signal (e.g., recorded and then restored during playback).

In an application according to the present invention, when reproducing a folded signal and restoring an unfolded signal in a reproduction apparatus operating according to the present invention, it is possible to provide a video image display at the same time while providing an improved video image display. When reproducing with a bandwidth reproducing device, it presents an improvement over the folding and unfolding devices proposed by the prior art, which provide improved backward compatibility.

FIG. 6A is a more detailed block diagram of the folding circuit 108 described in FIG. The folding circuit 108 performs several operations on the dynamic response space-time processed luminance signal to limit the luminance bandwidth for narrowband recording, and in particular, to generate high frequency luminance components (band generating luminance signal for recording, De-emphasis of the amplitude of the components) folded into the spectrum of the low frequency luminance components is preferably adaptively performed. As described in more detail below, the folding circuit 108 separates the band of the luminance signal into low frequency components and high frequency components, properly de-emphasizes the high frequency luminance components, and sets the high frequency luminance components to the low frequency luminance components. And fold into the spectral bandwidth, thereby compressing the full bandwidth luminance information of the input video signal into a narrow frequency band corresponding to the bandwidth of the narrow band video medium.

In the folding circuit shown in FIG. 6A, the input terminal 505 outputs the output terminal of the adaptive luminance separator 104 of FIG. 2, that is, the space-time processed luminance signal L of the soft switch 214 of FIG. It is connected to the terminal 215. The input terminal 505 inputs the dynamically adaptive and space-time processed baseband luminance signal L output from the soft switch 214, and inputs a first subtractor and an input terminal of the horizontal low pass filter 502. 504). The horizontal low pass filter 502 may be selected to have a value of -6 decibels (dB) at about 2.5 MHz, corresponding to one half of the folding frequency. Accordingly, the low pass filtered luminance signal L _L output from the horizontal low pass filter 502 includes only low frequency luminance components of 2.5 MHz or less, and the output signal L _{L is} formed by the adder 506. 1 input terminal and the subtractive input terminal of the subtractor 504. The horizontal low pass filter 502 and the subtractor 504 are configured to form a band separation filter at 2.5 MHz, and the horizontal low pass filter 502 is configured to generate a low frequency luminance component (L _L : low frequency luminance signal) of 2.5 MHz or less. The subtractor 504 outputs a high frequency luminance component (L _H : high luminance signal) of 2.5 MHz or more.

The horizontal low pass filter 502 outputs the low luminance signal L _L to the adder 506. The subtractor 504 is a signal input terminal of the first multiplier 508 that performs the de-emphasis operation on the high luminance signal L _H , and a control signal generator that controls the operation of the de-emphasis multiplier 508. 510 is applied. The control signal generator 510 has a de-emphasis gain control signal (the de-emphasis value D is inversely proportional to the gain through the multiplier 508. That is, D = 1 / gain, gain = 1 / D It is connected to the gain data input terminal of the de-emphasis multiplier (508). The control signal generator 510 and the de-emphasis multiplier 508 form a de-emphasis unit that performs de-emphasis operation, that is, attenuates the amplitude of the high frequency luminance component signal L _H. High frequency luminance signal (L _H) for the de-multiplier 508, the emphasis processing is de-M for the high-frequency luminance signal _(HD L) the emphasis processing, and outputs to the data input terminal of a folding modulator 512. The de-emphasized high frequency luminance signal L _HD subjected to the de-emphasis high frequency luminance signal L _HD in the folding modulator 512 is moved spectrally around the folding carrier in the form of amplitude modulation and 4-field offset modulation. Move (L _HD ) to the low luminance spectrum below 2.5 MHz (sampling is premodulation operation). That is, the high frequency luminance component shifted to the frequency spectrum of the low frequency luminance component signal L _L is generated to provide the shifted de-emphasis high frequency luminance signal L _HDF . The mobile de-emphasis high-frequency luminance signal L _HDF is input to a second input terminal of the adder 506 to be added to the baseband of the low frequency luminance component L _L to have a bandwidth of, for example, 2.5 MHz. An interleaving band-limited folding luminance signal L _r is generated, which is suitable for the luminance component recording narrow band of the conventional VCR, for example, the VHS type.

FIG. 6i shows the input full-band signal, FIG. 6j shows the signal after high-frequency band folding by Sub-Nyquist Sampling, which reduces the bandwidth of the original signal by one half. The high frequency signal components are shown by broken lines in the figure.

In the simple implementation of the de-emphasis circuit for performing the recording-side band-limiting according to the present invention, the multiplier 508 and the control signal generator 510 decrement the high frequency luminance signal component L _H by a predetermined value or decrease the amplitude. Can be replaced by a simple attenuator. As a result, the high frequency luminance amplitude level of the folding luminance signal L _r is maintained at or below a level at which annoying artifacts are detected in the display narrowband video image during reproduction in the narrowband reproducing apparatus. FIG. 6K shows the folding signal of FIG. 6j after the predetermined de-emphasis processing of the amplitude of the folding high frequency component is about 1/2.

However, this predetermined de-emphasis type prevents unobtrusive artifacts (ie, dot crawl) of the display narrowband image that may occur in the high amplitude folding high frequency component of the folding narrowband luminance signal. Can reduce the signal / noise ratio of the reproduction side, such that the amplitude of a portion of the high-frequency luminance signal at a relatively low amplitude reduces the signal / noise ratio of the portion of the recording luminance signal at the time of reproduction, such as a wide planar region with little or no contrast change. This may be reduced by the predetermined de-emphasis process.

That is, folding the high frequency luminance signal at full amplitude causes significant disturbances to the image reproduced in a conventional player, as occurs in the apparatus disclosed by Farouja. Therefore, in order to prevent the folding high frequency luminance component from being enlarged into an unobtrusive artifact in the display image when the encoded recording signal is reproduced in a conventional narrowband VCR, the amplitude of the high frequency luminance component interleaved with the low frequency luminance component (ie, It is desirable to reduce the modulation level. Reducing the modulation level of the folding high frequency signal by half may provide improved backward compatibility, but results in increased noise in the improved display wideband image. This noise increase occurs when the attenuated high frequency signal is restored to the original level and then boosted during the reproduction side decoding process. This noise is mostly detected in wide, low-level, planar images.

According to the present invention, the de-emphasis processing of the folding high-frequency luminance component at the recording side encoding and the accompanying un-folding de-emphasis at the reproduction-side decoding re-emphasis for restoring the high-frequency luminance component to the original amplitude. The processing is adaptive. That is, the level of the folding high frequency luminance component is adaptively de-emphasized during the encoding process and adaptively re-emphasized during the decoding process. The adaptive de-emphasis processing of the high frequency luminance component during the folding processing can sufficiently improve the video noise during decoding and reproduction of the encoded recording signal in the playback apparatus according to the present invention, and enhance backward compatibility in the encoding recording process. To provide.

The adaptive de-emphasis process has a high-frequency luminance component is high in extremely low-amplitude around the level a reduced level folding a high frequency luminance signal (L _H) and, when the said luminance signal and the amplitude at when the luminance signal (L _H) Fold When the high-pass luminance component in the folding process is adaptive de-emphasized in this way, the re-emphasis operation in reproduction decoding only increases the noise level during the high frequency high amplitude transition which is not detectable in the reproduction image.

FIG. 61 shows the folding high frequency component of FIG. 6j after adaptive de-emphasis processing according to the present invention, from which the de-emphasis level of the folding high-pass signal is compared to a predetermined de-emphasis in FIG. It can be seen that it changes. FIG. 6m corresponds to FIG. 61 except that the effect of the noise coring operation is further shown in the process of adaptively de-emphasizing the folding high-frequency luminance signal.

As described in detail with reference to FIG. 6B, the control signal generator 510 may be configured by connecting an absolute stroke 518, a horizontal low pass filter 520, and a lookup table 522 in series. The absolute stroke 518 can be easily realized with a full-wave rectifier. The high luminance signal LH input to the absolute stroke 518 is full-wave rectified and applied to the horizontal low pass filter 520 having a cutoff frequency of about 1 MHz. The output signal E _H of the horizontal low pass filter 520 accurately represents the average energy of the high luminance signal L _H over a predetermined period determined by the time constant of the horizontal low pass filter 520. In other words, the value of the signal E _H represents the average "local" energy of the high luminance signal L _H. In the large planar region, the signal E _H becomes zero, while the signal E _H has a high amplitude when the contrast is a high frequency transition. The signal E _H is input to an address of the lookup table 522, and the lookup table 522 outputs a signal 1 / D for controlling the gain of the de-emphasis multiplier 508.

The gain G transfer function of the lookup table 522 has a monotonically decreasing characteristic, as shown by the thick solid line in FIG. 6C. Here, the energy level E _H of the high-frequency luminance signal L _H applied to the control signal generator 510 is shown on the horizontal axis, and the gain G applied to the multiplier 508 is shown on the vertical axis. As can be seen in FIG. 6C, as the high-frequency luminance signal level increases, the gain G applied to the multiplier 508 correspondingly decreases monotonically, and thus the de-emphasis transfer function D (L _H ) to the multiplier 508. ) Will be printed. The de-emphasis value D is shown by the solid line in FIG. 6C. In the improved noise performance, at low amplitudes of the high luminance component L _H , the coring function is included in the transfer function of the lookup table 522, as in the diagonally shaded region of FIG. 6C. The lookup table 522 is identical to the lookup table 410 of FIG. 5 except that the lookup table 522 has only one data output signal. The output signal of the lookup table 522, i.e., the de-emphasis gain control signal 1 / D, is generated from a memory location in the ROM that is addressed by the signal E _H. When the measured average high frequency luminance signal energy E _H is very low or zero, the gain G is set at a unit or a value close to the unit so that the high frequency luminance signal L _H is not de-emphasized. , Ie, is applied to multiplier 508 without attenuation. However, when the signal E _H is at a high level, the gain G is set to a low value such that the gain applied to the multiplier 508 is reduced to a unit or less, and the effect of the high-frequency luminance component applied to the multiplier 508 The level is reduced to provide maximum de-emphasis. When the signal E _H is an incremental value, the de-emphasis gain control signal G will correspond to an intermediate value between 0 and 1, and the intermediate de-emphasis processing of the high-frequency luminance signal L _H is performed. do. This adaptive de-emphasis processing effect allows the attenuation to be low or no when the folding high pass luminance component is low amplitude, but significantly attenuates the luminance component when the folding high pass luminance component is high amplitude.

After the adaptive de-emphasis processing, the de-emphasized high-frequency luminance signal L _HD is input to the signal input terminal of the amplitude modulator 512. The modulation clock input terminal of the modulator 512 is connected to a folding carrier signal source (not shown) having a frequency f _f of, for example, 5 MHz, so that the high frequency luminance component is a low frequency luminance spectrum, for example, 2.5. Is moved below MHz.

The de-emphased high-frequency signal (LHD) is modulated by a half folding carrier (sampling) of the modulator 512 near the folding frequency by a (+1, -1) type modulation operation. The folding frequency f _f is selected to minimize the spacing between the folding carrier and the baseband luminance signal in time, vertical and horizontal directions. The folding carrier is located at 1/2 of the maximum vertical frequency and 1/2 of the maximum time frequency, that is, at the point corresponding to the so-called Fukinuki hole in the time and vertical directions, and about 5 MHz in the horizontal direction. It is desirable to. This maximizes the spectral spacing between the folding carrier and the vertical and temporal low frequency components of the luminance signal.

The modulator 512 can be a standard four-quadrant multiplier, or if the sampling frequency is properly selected (+1, -1) modulators are suitable. The (+1, -1) modulator alternately arithmetic inverts the sampling, thereby modulating the sampling signal at the same frequency as the half-sampling frequency. For example, if a sampling frequency is selected at about 10 MHz, the folding frequency is about 5 MHz, at which time the actual frequency is met to meet the above criteria relating to the vertical and temporal spectral spacing from the vertical and time direct current (DC). Is selected. The output signal includes a half sampling frequency component and an upper and lower band centering on sampling frequencies around +1/2 and -1/2 having spectral information included in the input signal. Thus, the (+1, -1) amplitude modulation shifts (i.e., aliases) the high-band luminance signal L _H to the -1/2 low-band sideband in the 2.5 MHz bandwidth of the low band luminance signal L _L. .

As shown in FIG. 6D, the amplitude modulator 512 of FIG. 6A having a data input and an output terminal and a clock input terminal has a first data input terminal corresponding to the data input terminal of the amplitude modulator 512 and includes a signal ( This can be realized by using a multiplexer 524 (MUX) for inputting L _HD ). Arithmetic negator (526), that is, inverter 526 is connected to the data output terminal of the de-emphasis multiplier 508 to input the signal (L _HD ), the output terminal of the multiplexer 524 is connected to the second data input terminal. The output terminal of the multiplexer 524 is connected to the input terminal of the adder 506. The folding clock signal having the same frequency as the 1/2 sampling clock frequency is connected to the control input terminal of the multiplexer 524. This signal is altered to a logic "1" and a logic "0" at the sampling frequency and can be generated by a flip-flop connected to the sampling clock signal.

In operation, if the folding clock signal is a logic " 1 " signal, multiplexer 524 couples the non-negated signal of its input terminal to its output terminal. Also, if the folding clock signal is a logic " 0 " signal, then multiplexer 524 couples the negated (-1) signal of arithmetic navigator 526 to its output terminal. In this way, the (+1, -1) modulated signal is reproduced. The low sideband of the modulated signal comprises a spectral image of the 2.5-4.2 MHz bandwidth de-emphasis luminance signal L _HD excluding the countered frequency. That is, since the de-emphasized high-frequency luminance signal L _HD is folded near the folding frequency, the low-frequency components of the de-emphasis high-frequency luminance signal are folded in the band below 2.5 MHz, and the de-emphasis high-frequency luminance at 4.2 MHz. The high frequency component of the signal is, for example, folded at about 800 KHz to generate a folding de-emphasis high-frequency luminance signal L _HDF .

The folding de-emphasis high-band luminance signal L _HDF is then mixed with the low-band luminance signal L _L at the adder 506. The adder 506 generates a compound folding luminance signal L _f containing luminance information of the input optical miracle band luminance signal L compressed within a folding bandwidth of 2.5 MHz. This makes it possible to transmit NTSC baseband luminance information of 4.2 MHz via a 2.5 MHz narrowband medium such as conventional narrowband VCRs and video cassettes.

The folding luminance signal L _f is applied to the recording equalizer 514 of FIG. 6A, which equalizes the pre-compensate loss of the tape path and compensates for the loss in the encoding process. For example, in order to apply a signal to a digital-to-analog converter by boosting a frequency of about 2.5 MHz to compensate for the signal attenuation characteristic in the band separation region of the de-emphasis circuit band separation filter, the signal of FIG. Is applied to the / A converter 110. The signal output from the D / A converter 110 is applied to the luminance signal recorder 20 of FIG. 1 so that the recording carrier is frequency modulated, and the recording head 40 is ultimately applied to the video tape with the frequency modulation narrowband luminance component. Is recorded.

In the above embodiment, even if the high luminance signal L _H is adaptively de-emphasized before being folded modulated and added to the low luminance signal L _L , the folding circuit 108 shown in FIG. It can be seen that the same effect can be obtained by switching the order of multiplier 508 and modulator 512. As shown in the block of FIG. 6g, first, the high frequency luminance signal L _H is folded by the folding modulator 512, and then the folding high frequency signal output from the folding modulator 512 is adaptively applied by the de-emphasis multiplier 508. FIG. De-emphasis treatment is performed. In this case, the circuits corresponding to FIGS. 6g to 6a are described with the same reference numerals.

In addition, since the folding operation according to the present invention is performed only by the high pass luminance component signal, the low pass filter after the adder 506 generally required when the folding is performed to the baseband luminance signal necessarily involves the folding circuit 108. It can be seen that it does not have to be. However, the adaptive de-emphasis process according to the present invention can be effectively applied to a folding apparatus in which folding is performed on the baseband luminance signal L as well. Another folding circuit of this type is shown in FIG. 6h, where the baseband luminance signal L is adapted to adaptive de-emphasis the one input terminal of the adder 550 and the high frequency luminance signal with a monotonically reduced transmission function. Input to the de-emphasis circuit 560. The de-emphasis baseband luminance signal is applied to the folding modulator 570 and shifted by (+1, -1) multiplexing according to the folding clock as described above. The de-emphasis moving baseband luminance signal is input to the other end of the adder 550 and mixed with the input baseband luminance signal. The interleaved luminance signal output from the adder 550 is applied to the horizontal low pass filter 580 having a cutoff frequency of 2.5 MHz, and then D / A converted and recorded as described above.

In the above-described embodiment of the folding circuit that uses the band separation filter in the de-emphasis circuit shown in Figs. 6A and 6G, the bandwidth of the compatible recording luminance signal L _r is 2.5 MHz, i.e., in the band separation filter. It extends only around the upper limit of the output low pass luminance signal, and the luminance signal of 2.5 MHz or more is transmitted as a folding signal. In the folding circuit of FIG. 6H described above, the essential use of the low pass filter 580 after folding limits the bandwidth of the write luminance signal L _L to 2.5 MHz. Limitations of such recording luminance signal bandwidth when the recording signal is reproduced by a reproducing apparatus operating a decoder according to the present invention for unfolding a compatible encoded recording folding luminance signal and reproducing a wideband luminance signal generated therefrom. Is not important. This is because the folding luminance signal extended by 2.5 MHz or more can be restored in the playback decoding process according to the present invention to display an image having full horizontal resolution. However, when reproducing a compatible encoded recording signal in a conventional playback apparatus that is difficult to easily decode, the display horizontal resolution may be limited by the limited bandwidth of the playback luminance signal since the high frequency luminance signal transmitted to the folding signal is not restored. will be.

Another embodiment of the 6n-degree folding circuit according to the present invention performs different band-pass filtering of the luminance signal during encoding, thereby improving horizontal resolution during compatible playback. Compared with the folding circuit of FIG. 6g described above, the horizontal lowpass filter 502 and the horizontal highpass filter 504 forming the band separation filter in FIGS. 6a and 6g have -6 decibels (dB) corresponding to about 3 MHz. And a horizontal lowpass filter 1502 having a characteristic of providing a high frequency filter 1502 and a vertical highpass filter 1504 providing -6 decibels (dB) corresponding to 2.5 MHz. At this time, the horizontal low pass filter 1502 and the vertical high pass filter 1504 input the input luminance signal L, respectively. The horizontal low pass filter 1502 and the vertical high pass filter 1504 together perform band separation, but their respective output signals L _L (L _H ) are somewhat overlapped in frequency rather than adjacent half bands or separation bands. have.

That is, the horizontal low pass filter 1502 and the vertical high pass filter 1504 together form an inverting filter (eg, their respective response characteristics are inverted and symmetrical to each other) so that they can be performed as shown in detail in FIG. do. The luminance signal L is input to the mantissa tap adder 2510 and the even tap adder 2520, respectively. The output terminal of the cardinal tap adder 2510 is connected to the one input terminal of the adder 2530 and the subtractive input terminal of the subtractor 2540. The output terminal of the even tap adder 2520 is connected to the type force terminal of the adder 2530 and the subtracted input terminal of the subtractor 2540. The adder 2530 is a radix tap adder 2510 and the even tap adder 2540 subtracts other output signals of the radix tap adder 2510 and the even tap adder 2520 to vertically high pass filtered signals (L _H '). )

Claims (140)

A video signal processing apparatus for transmitting a wideband video signal through a limited band video medium, comprising: receiving a video signal connected to a limited band video medium, the video signal including at least a wideband luminance signal having a high frequency luminance component and a low frequency luminance component; De-emphasis of the high frequency luminance band component by the low frequency luminance band component having a bandwidth limited to a predetermined limited bandwidth from the video signal, a band filter means for generating a high frequency luminance band component, and an amplitude of the high frequency luminance band component De-emphasis means, and folding means for folding the high frequency luminance band component into a spectrum of the low frequency luminance band component. 2. The apparatus of claim 1, wherein the de-emphasis means comprises: a gain control signal generating means for generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy of the high frequency luminance band component, and the de-emphasis; And a de-emphasis gain means for attenuating the amplitude of the high frequency luminance band component in accordance with a gain control signal. 3. The apparatus according to claim 2, wherein the gain control signal generating means includes an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, and a low pass filtering of the absolute value signal to represent an average energy of the high frequency luminance band component. And a look-up table means for generating a de-emphasis gain control signal whose value changes in accordance with said average energy signal. 3. The video signal processing apparatus according to claim 2, wherein the de-emphasis gain means includes multiplier means for multiplying the high-frequency luminance band component by the de-emphasis gain control signal. 2. The apparatus of claim 1, wherein the de-emphasis means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, and an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal. A low-pass filter means for providing an energy signal, a look-up table means for generating a de-emphasis gain control signal whose value varies in accordance with the average energy signal, and the de-emphasis gain control signal in the high frequency luminance band component. And a multiplier means for multiplying. 2. The method according to claim 1, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies in proportion to the amplitude of the high frequency luminance band component in the input video signal. Video signal processing device. 2. The method of claim 1, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies monotonically in relation to the average energy of the high frequency luminance band component in the input video signal. Video signal processing apparatus characterized in that. A video signal processing apparatus for transmitting a wideband video signal through a limited band video medium, comprising: receiving a video signal connected to a limited band video medium, the video signal including at least a wideband luminance signal having a high frequency luminance component and a low frequency luminance component; A low frequency luminance band component having a bandwidth limited to a predetermined limited bandwidth from a video signal, band filter means for generating a high frequency luminance band component, and for de-emphasizing the high frequency luminance band component by an amplitude of the high frequency luminance band component And de-emphasis means and folding means for folding the de-emphasized high-frequency luminance band component to the low-frequency luminance band component. 9. The apparatus of claim 8, wherein the de-emphasis means comprises: a gain control signal generating means for generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy of the high frequency luminance band component, and the de-emphasis means; And a de-emphasis gain means for attenuating the amplitude of the high frequency luminance band component in accordance with an emphasis gain control signal. 10. The apparatus of claim 9, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing the average energy of the high frequency luminance band component by low-pass filtering the absolute value signal; A low pass filter means for providing an energy signal, and a look-up table means for generating a de-emphasis gain control signal whose value changes in accordance with the average energy signal. 10. The video signal processing apparatus according to claim 9, wherein the de-emphasis gain means includes multiplier means for multiplying the high-frequency luminance band component by the de-emphasis gain control signal. 9. The apparatus of claim 8, wherein the de-emphasis means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal; A low-pass filter means for providing an energy signal, a look-up table means for generating a de-emphasis gain control signal whose value varies in accordance with the average energy signal, and the de-emphasis gain control signal in the high frequency luminance band component. And a multiplier means for multiplying. 9. A method according to claim 8, characterized in that the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies in proportion to the amplitude of the high frequency luminance band component in the input video signal. Video signal processing device. 9. The method according to claim 8, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies monotonically in relation to the average energy of the high frequency luminance band component in the input video signal. Video signal processing apparatus characterized in that. A video signal processing apparatus for transmitting a wideband video signal through a limited band video medium, comprising: receiving a video signal connected to a limited band video medium, the video signal including at least a wideband luminance signal having a high frequency luminance component and a low frequency luminance component; A low frequency luminance component having a bandwidth limited to a predetermined limited bandwidth from the video signal, band filter means for generating a high frequency luminance component, folding means for folding the high frequency luminance component to the low frequency luminance component, and the high frequency luminance component And de-emphasis means for de-emphasing the high frequency luminance component by amplitude. 16. The apparatus of claim 15, wherein the de-emphasis means comprises: a gain control signal generating means for generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy of the high frequency luminance component, and the de-em And a de-emphasis gain means for attenuating the amplitude of the high frequency luminance component in accordance with the gain gain control signal. 17. The apparatus of claim 16, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance component, and an average energy signal representing an average energy of the high frequency luminance component by low-pass filtering the absolute value signal. And a look-up table means for generating a de-emphasis gain control signal whose value varies according to the average energy signal. 17. The video signal processing apparatus according to claim 16, wherein the de-emphasis gain means comprises multiplier means for multiplying the high-frequency luminance component by the de-emphasis gain control signal. 16. The method of claim 15, wherein the de-emphasis means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance component, and an average energy representing an average energy of the high frequency luminance component by low-pass filtering the absolute value signal. Low-pass filter means for providing a signal, look-up table means for generating a de-emphasis gain control signal whose value varies in accordance with the average energy signal, and for multiplying the de-emphasis gain-generated arc by the high-frequency luminance component. And a multiplier means. 16. The video signal according to claim 15, wherein the amount of de-emphasis of the high frequency luminance component executed by the de-emphasis means varies in proportion to the amplitude of the high frequency luminance component in the input video signal. Processing unit. 16. The method of claim 15, wherein the amount of de-emphasis of the high-frequency luminance component performed by the de-emphasis means varies monotonically in relation to the average energy of the high-frequency luminance component in the input video signal. A video signal processing device. A video signal processing apparatus for transmitting a wideband video signal through a limited band video medium, comprising: receiving an input video signal connected to the limited band video medium and receiving at least an input wideband luminance signal, the amplitude being decoded from the input video signal; A limited band having an high frequency luminance component of the input wideband luminance signal emulated, the amount of de-emphasis varying with the amplitude in the input video signal, and folded to a bandwidth of a low frequency luminance component limited to the limited bandwidth And encoder means for generating a limited band video signal comprising a luminance signal and for generating a moving signal indicative of a degree of the moving image in the input video signal. 23. The video signal processing apparatus according to claim 22, wherein an amount of de-emphasis of the high frequency luminance component varies in proportion to an amplitude of the high frequency luminance component in the input video signal. 23. The video signal processing apparatus according to claim 22, wherein the amount of de-emphasis of the high frequency luminance component varies monotonically in relation to the average energy of the high frequency luminance component in the input video signal. 23. The apparatus of claim 22, wherein the encoder means receives the wideband luminance signal to generate a low frequency luminance band component having a bandwidth limited to a limited bandwidth, a band filter means for generating a high frequency luminance band component, and an amplitude of the high frequency luminance band component. De-emphasis means for de-emphasing the high frequency luminance band component by means of: folding means for folding the high frequency luminance band component into a frequency spectrum of the low frequency luminance band component; and And a dynamic signal generating means for generating the dynamic signal indicating a degree. 27. The apparatus of claim 25, wherein the de-emphasis means comprises: a gain control signal generating means for generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy of the high frequency luminance band component, and the de-emphasis means; And de-emphasis gain means for attenuating the amplitude of the high frequency luminance band component in accordance with an emphasis gain control signal. 27. The apparatus of claim 26, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal; And a look-up table means for generating a de-emphasis gain control signal whose value changes in accordance with said average energy signal. 27. The video signal processing apparatus according to claim 26, wherein said de-emphasis gain means comprises multiplier means for multiplying said high-frequency luminance bend component by said de-emphasis gain control signal. 26. The apparatus of claim 25, wherein the de-emphasis means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal A low-pass filter means for providing an energy signal, a look-up table means for generating a de-emphasis gain control signal whose value changes in accordance with the average energy signal, and the de-emphasis gain control signal in the high frequency luminance band component. And a multiplier means for multiplying. 26. The method of claim 25, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies in proportion to the amplitude of the high frequency luminance band component in the input video signal. Video signal processing device. 26. The method according to claim 25, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies monotonically in relation to the average energy of the high frequency luminance band component in the input video signal. Video signal processing apparatus characterized in that. 26. The video signal processing apparatus according to claim 25, wherein the copper signal is spread by horizontal and vertical axes by the copper signal generating means. 27. The video signal processing apparatus of claim 25, wherein the moving signal is spread on a horizontal, vertical, and time axis. 26. The video signal processing apparatus according to claim 25, wherein the moving signal generating means comprises spreading means for spreading the moving signal on a spatial axis. 26. The video signal processing apparatus according to claim 25, wherein the moving signal generating means includes spreading means for spreading the moving signal on a space and a time axis. 26. The luminance signal according to claim 25, wherein the broadband luminance signal affected by the band separation means is a broadband luminance signal filtered spatially and spatially, and the encoder means spatially filters the broadband luminance signal to spatially filter the luminance signal. A spatial filter means for generating a signal, a time filter means for generating a temporally filtered luminance signal by temporally filtering the broadband luminance signal, and the broadband time / supply supplied to the band separation means in response to the same signal. And co-adapting means for varying a portion of the spatially filtered luminance signal and a portion of the temporally filtered luminance signal of the spatially filtered luminance signal. 37. The video signal processing apparatus according to claim 36, wherein the copper signal is spread out horizontally and vertically by the copper signal generating means. The video signal processing apparatus according to claim 36, wherein the copper signal is spread out horizontally and on a time axis by the copper signal generating means. A video signal processing apparatus for transmitting a wideband video signal through a limited band video medium, comprising: an input terminal connected to a composite video signal source and an output terminal connected to a limited band video medium, and having a high frequency and a low frequency luminance frequency at the input terminal; Receiving an input composite video signal comprising a baseband luminance component and a color signal component, the amplitude being de-emphasized from the input video signal, fold into a bandwidth of a low frequency luminance component limited to a limited bandwidth, and the de-emphasis Generates a limited-band luminance signal having a high frequency luminance component whose amount of light varies in accordance with the amplitude in the input video signal, and generates a dynamic signal from the input video signal indicative of the degree of a moving image in the input video signal. Spatially filter the luminance signal When the spatially filtered luminance signal is generated, the baseband luminance signal is temporally filtered to generate a temporally filtered luminance signal, and the spatially filtered luminance signal of the limited band luminance signal corresponding to the copper signal is generated. And a portion of the temporally filtered luminance signal, varying the copper signal and the color signal to generate a composite color / motion signal, and outputting the limited band luminance signal and the color / motion signal to the output terminal. And an encoder means for providing the video signal processing apparatus. 40. The video signal processing apparatus according to claim 39, wherein an amount of de-emphasis of the high frequency luminance component is changed in proportion to an amplitude of the high frequency luminance component in the input video signal. 40. The video signal processing apparatus according to claim 39, wherein the amount of de-emphasis of the high frequency luminance component varies monotonically in relation to the average energy of the high frequency luminance component in the input video signal. 40. The video signal processing apparatus according to claim 39, wherein the moving signal is spread by the encoder means in horizontal and vertical axes. 40. The video signal processing apparatus according to claim 39, wherein the moving signal is spread by the encoder means in horizontal, vertical, and time axes. 40. The video signal processing apparatus according to claim 39, wherein the copper signal is added to an empty portion of the color signal to generate the composite color / motion signal. The video signal processing apparatus according to claim 39, wherein the color component of the color / motion signal is a color-under color signal. 40. The apparatus of claim 39, wherein the encoder means comprises: color / luminance separation means for separating the input composite video signal into the broadband baseband luminance signal component and the color signal component, and deriving the dynamic signal from the broadband baseband luminance signal. Dynamic signal generating means for spatially filtering the broadband baseband luminance signal to generate a spatially filtered baseband luminance signal, temporally filtering the broadband baseband luminance signal for temporally filtering the baseband A temporal filter means for generating a luminance signal, the spatially filtered baseband luminance signal and the temporally filtered baseband luminance signal outputted in time / spatially filtered baseband luminance signal corresponding to the copper signal; Co-adaptation means for changing each part, the time-spatially filtered baseband luminance scene A low frequency luminance band component having a bandwidth limited to the limited bandwidth, and a de-emphasis means for adaptively de-emphasizing a high frequency luminance band component, wherein the high frequency luminance band component is converted into a low frequency luminance band component. Folding the bandwidth to provide the limited band luminance signal, folding means for connecting the limited band luminance signal to the output terminal of the encoder means, and mixing the color signal and the same signal to generate a composite color / motion signal; And color / copper mixing means for coupling said color / copper signal to said output end of said encoder means. 47. The apparatus of claim 46, wherein the de-emphasis means comprises: a gain control signal generating means for generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy of the high frequency luminance band component, and the de-emphasis means; And de-emphasis gain means for attenuating the amplitude of the high frequency luminance band component in accordance with an emphasis gain control signal. 48. The apparatus of claim 47, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing the average energy of the high frequency luminance band component by low-pass filtering the absolute value signal; And a look-up table means for generating a de-emphasis gain control signal whose value changes in accordance with said average energy signal. 48. The apparatus of claim 47, wherein said de-emphasis gain means comprises multiplier means for multiplying said de-emphasis gain control signal by said high-frequency luminance band component. 48. The apparatus of claim 47, wherein the de-emphasis means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, and an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal. A low-pass filter means for providing an energy signal, a look-up table means for generating a de-emphasis gain control signal whose value varies in accordance with the average energy signal, and the de-emphasis gain control signal in the high frequency luminance band component. And a multiplier means for multiplying. 48. The apparatus of claim 47, wherein an amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies in proportion to an amplitude of the high frequency luminance band component in the input video signal. Video signal processing device. 48. The method of claim 47, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies monotonically in relation to the average energy of the high frequency luminance band component in the input video signal. Video signal processing apparatus characterized in that. 48. The video signal processing apparatus according to claim 47, wherein the moving signal generating means diffuses the derived moving signal spatially. 48. The video signal processing apparatus according to claim 47, wherein the moving signal generating means spreads the derived moving signal on a time and space axis. A video signal processing apparatus for converting an input wideband composite video signal including a wideband baseband luminance signal component and a color signal component into a limited band video signal, comprising: converting the input wideband composite video signal into the wideband baseband luminance signal component and a color signal component Color / luminance dividing means for dividing the signal, dynamic signal generating means for deriving a dynamic signal representing a degree of a moving image in the input wideband composite video signal from the broadband baseband luminance signal, and spatially separating the broadband baseband luminance signal. Spatial filter means for filtering to generate a spatially filtered baseband luminance signal, temporal filtering means for generating a temporally filtered baseband luminance signal by temporally filtering the broadband baseband luminance signal, and corresponding to the same signal Time-spatially filtered baseband luminance scene Receiving co-adaptation means for varying respective portions of said spatially filtered baseband luminance signal and said temporally filtered baseband luminance signal, said space-time-spatially filtered baseband luminance signal, A low frequency luminance band component having a limited bandwidth in a limited bandwidth, a band filter means for generating a high frequency luminance band component, and a de-emphasis for adaptively de-emphasizing the high frequency luminance band component by an amplitude of the high frequency luminance band component. Emulation means, folding means for folding the high frequency luminance band component into a bandwidth of the low frequency luminance band component to provide a folded band limited luminance signal, and mixing the color signal component and the same signal to produce a composite color / motion signal; And video / copper mixing means for generating. 56. The apparatus of claim 55, wherein the de-emphasis means comprises: a gain control signal generating means for generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy of the high frequency luminance band component, and the de-emphasis means; And de-emphasis gain means for attenuating the amplitude of the high frequency luminance band component in accordance with an emphasis gain control signal. 57. The apparatus of claim 56, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal; And a look-up table means for generating a de-emphasis gain control signal whose value changes in accordance with said average energy signal. 59. The video signal processing apparatus according to claim 56, wherein said de-emphasis gain means comprises multiplier means for multiplying said high frequency band component by said de-emphasis gain control signal. 56. The apparatus of claim 55, wherein the de-emphasis means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component, an average representing an average energy of the high frequency luminance band component by low-pass filtering the absolute value signal A low-pass filter means for providing an energy signal, a look-up table means for generating a de-emphasis gain control signal whose value varies in accordance with the average energy signal, and the de-emphasis gain control signal in the high frequency luminance band component. And a multiplier means for multiplying. 56. The video signal processing apparatus according to claim 55, wherein an amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies in proportion to an amplitude of the high frequency luminance band component. 56. The video according to claim 55, wherein the amount of de-emphasis of the high frequency luminance band component executed by the de-emphasis means varies monotonically in relation to the average energy of the high frequency luminance band component. Signal processing device. 56. The video signal processing apparatus according to claim 55, wherein the color / copper mixing means applies the copper signal to the empty portion of the color signal component to generate the composite color / copper signal. The video signal processing apparatus according to claim 55, wherein the color signal component mixed with the same signal by the color / copper mixing means is a color-under color signal. 56. The video recording apparatus according to claim 55, further comprising luminance signal recording means for recording the folded limited band luminance signal on a recording medium and color signal recording means for recording the color / motion signal on the recording medium. Signal processing device. The video signal processing apparatus according to claim 64, wherein the recording medium is a magnetic tape in the video cassette. 56. The apparatus of claim 55, wherein the color / copper mixing means modulates the color signal component into a color carrier to provide a modulated color signal component such that the modulated color signal component occupies only a portion of the color signal carrier at a given point in time. Color signal modulating means in which other portions of the color signal carrier become empty spaces without the modulated color signal component, and modulating the moving signal into a moving signal carrier to provide a modulated moving signal, so that the modulated moving signal is Dynamic signal modulating means for occupying only a portion of the dynamic signal carrier corresponding to the empty space of the color signal carrier not occupied by the modulated color signal component, and the modulated color signal component and the modulated dynamic signal component. By adding the composite color / motion signal, the modulated motion signal component in the color / motion signal is always Referenced video signal processing apparatus characterized by comprising a color signal component and adder means to have a phase difference of 180 °. A video signal processing apparatus for converting a limited band fold video luminance signal into a wideband unfolded video luminance signal, comprising: a low frequency luminance band having a limited bandwidth in a limited bandwidth and a high frequency luminance band folded in a spectrum of the low frequency luminance band component; Unfolding the restricted band unfolded video luminance signal including the component, the low frequency luminance band component of the limited band video luminance signal having a bandwidth greater than the limited bandwidth and the high frequency luminance band component unfolded from the limited band video luminance signal And an decoder means for providing an unfolded baseband luminance signal having an amplitude and emulating the amplitude of the unfolded luminance high frequency band component by an amount corresponding to the magnitude of the unfolded luminance high frequency band component. A video signal processing device. 68. The video signal processing apparatus according to claim 67, wherein an amount of the emphasis of the high frequency luminance band component is changed in proportion to an amplitude of the high frequency luminance band component. 68. The video signal processing apparatus according to claim 67, wherein an amount of an emphasis of the high frequency luminance band component is monotonically increased in association with an average energy of the high frequency luminance band component. 68. The apparatus of claim 67, wherein the decoder means unfolds the limited band video luminance signal to provide the unfolded baseband luminance signal, and the unfolded high frequency luminance band component. And an emphasizing means for emphasizing the amount according to the amplitude of the high frequency luminance band component. 71. The video signal processing apparatus according to claim 70, wherein an amount of emphasis performed by the emphasis means varies in proportion to the amplitude of the high frequency luminance band component depending on the high frequency luminance band component. A video signal processing according to claim 70, wherein the amount of emphasization performed by the emphasis means varies monotonically in relation to the average energy of the high frequency luminance band component, depending on the high frequency luminance band component. Device. 71. The apparatus of claim 70, wherein the emphasizing means comprises: a gain control signal generating means for generating an emphasis gain control signal that is monotonically increased in relation to the average energy of the unfolded high frequency luminance band component, and the emphasis gain; And an gain gain means for boosting the amplitude of the unfolded high frequency luminance band component in accordance with a control signal. 80. The apparatus of claim 73, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the unfolded high frequency luminance band component, and the low value filtering of the absolute value signal to fold the unfolded high frequency luminance band component. And a low pass filter means for providing an average energy signal indicative of the average energy of the signal, and a lookup table means for generating an emphasis gain control signal whose value changes in accordance with the average energy signal. 75. The video signal processing apparatus according to claim 74, wherein said emphasis gain means includes multiplier means for multiplying said unfolded high frequency luminance band component by said emphasis gain control signal. 71. The apparatus of claim 70, wherein the emphasizing means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the unfolded high frequency luminance band component, and an average of the unfolded high frequency luminance band component by low-pass filtering the absolute value signal A low pass filter means for providing an average energy signal representing energy, a look-up table means for generating an emphasis gain control signal whose value varies in accordance with the average energy signal, and the emphasis in the unfolded high frequency luminance band component; And multiplier means for multiplying a gain control signal. A video signal processing apparatus comprising: unfolding a limited band fold video luminance signal including a low frequency luminance band component having a limited bandwidth in a limited bandwidth and a high frequency luminance band component folded in a spectrum of the low frequency luminance band component, wherein the limited bandwidth Unfolding means for providing an unfolded baseband luminance signal having a greater bandwidth and including said low frequency luminance band component of said fold video luminance signal and said high frequency luminance band component unfolded from said fold video luminance signal, said A spatial filter means for spatially filtering an unfolded baseband luminance signal to generate a spatially filtered baseband luminance signal, and temporally filtering the unfolded baseband luminance signal to filter a temporally filtered baseband luminance signal Time filter means for generating, in the video image Color / copper separation means for separating the composite color / copper signal including the mixed video color signal component and the dynamic signal indicating the degree of the image, and providing the separated color signal and the separated copper signal, corresponding to the same signal. Co-adaptation means for varying respective portions of said spatially filtered baseband luminance signal and said temporally filtered baseband luminance signal output as a spatially filtered baseband luminance signal, said space / spatially filtered Band-filter means for generating a spatio-temporal filtered low-frequency luminance band component having a bandwidth limited to the limited bandwidth by receiving a baseband luminance signal, and a spatio-temporal filtered high-frequency luminance band component; The amplitude of the high frequency luminance band component filtered in time and space according to the magnitude of the filtered high frequency luminance band component The emphasis means for providing an emphasis time / spatially filtered high frequency luminance band component, and the emphasis time / spatially filtered high frequency luminance band component and the time / spatially filtered low frequency luminance band component. And mixing means for continuously mixing to provide a broadband luminance signal. 78. The apparatus of claim 77, wherein the emphasizing means embodies the amplitude of the spatio-temporally filtered high frequency luminance band component by an amount that increases in proportion to the amplitude of the spatio-temporally filtered high frequency luminance band component. Video signal processing apparatus characterized in that. 78. The apparatus of claim 77, wherein the emphasizing means emulates the amplitude of the spatio-temporally filtered high frequency luminance band component by an amount monotonically increasing in relation to the average energy of the spatio-temporally filtered high frequency luminance band component. A video signal processing apparatus comprising a facilitating system. 78. The video signal processing apparatus of claim 77, wherein the color signal component is a color-under color signal. 78. The apparatus of claim 77, wherein the emphasizing means comprises: a gain control signal generating means for generating an emphasis gain control signal that monotonically increases and changes in relation to the average energy of the spatio-temporally filtered high frequency luminance band component, and the And an emphasis gain means for boosting the amplitude of the high frequency luminance band component filtered in time and space according to an emphasis gain control signal. 84. The apparatus of claim 81, wherein the gain control signal generating means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the high frequency luminance band component filtered in time / spatially, and low-pass filtering the absolute value signal in time / spatially A low pass filter means for providing an average energy signal representing an average energy of the filtered high frequency luminance band component, and a look-up table means for generating an emphasis gain control signal whose value changes in accordance with the average energy signal. A video signal processing device. 84. The video signal processing apparatus according to claim 81, wherein the emphasizing gain means comprises multiplier means for multiplying the temporal / spatially filtered high frequency luminance band component by the emphasis gain control signal. 78. The apparatus of claim 77, wherein the emphasizing means comprises: an absolute value means for generating an absolute value signal representing an absolute value of the time- and spatially-filtered high-frequency luminance band component, and the time- and spatially-filtered value by low-pass filtering the absolute value signal. A low pass filter means for providing an average energy signal representing an average energy of a high frequency luminance band component, a look-up table means for generating an emphasis gain control signal whose value changes in accordance with the average energy signal, and the spatio-temporal filter And multiplier means for multiplying the high-frequency luminance band component by the emphasis gain control signal. 78. The video signal as claimed in claim 77, further comprising: luminance signal reproducing means for reproducing the folded video luminance signal from a recording medium, and color signal reproducing means for reproducing the color / motion signal from the recording medium. Processing unit. 86. The video signal processing apparatus according to claim 85, wherein said recording medium is a magnetic tape in a video cassette. A video signal processing apparatus comprising: a low frequency luminance band component having a limited bandwidth in a limited bandwidth by encoding an input video signal including at least an input broadband luminance signal having a low luminance frequency and a high luminance frequency, and a magnitude in the input broadband luminance signal; Encoded limited-band luminance having a high frequency luminance band component that is de-emphasized and folds in a bandwidth of the low frequency luminance band component, and wherein the amount of de-emphasis varies depending on the magnitude in the input broadband luminance signal. Encoder means for generating a limited band video signal comprising at least a signal, and having said low frequency luminance band component together with said high frequency luminance band component unfolded from said limited band signal by decoding said limited band video signal; Band larger than limit bandwidth An amount of the de-emphasis of the unfolded high frequency luminance band component by the encoder means for generating an output video signal comprising at least a decoded wideband luminance signal having a magnitude; And a decoder means for re-emphasing as much as corresponding to and recovering the high frequency luminance band component from the input wideband luminance signal to the magnitude. 88. The apparatus according to claim 87, wherein an amount of said de-emphasis of said high frequency luminance band component executed by said encoder means and an amount of said re-emphasis of said high frequency luminance band component executed by said decoder means are respectively: A video signal processing apparatus characterized by changing in proportion to the magnetism. 88. The apparatus according to claim 87, wherein an amount of said de-emphasis of said high frequency luminance band component performed by said encoder means monotonically increases in relation to an average energy of said high frequency luminance band component, and is executed by said decoder means. And the amount of the re-emphasis of the unfolded high frequency luminance band component is monotonically reduced in relation to the average energy of the unfolded high frequency luminance band component. To provide a composite color / auxiliary signal by transmitting an auxiliary signal and color information of a video image, and mixing a video color signal occupying at most two quadrants of opposite directions of a color carrier on which a video color signal is modulated at a predetermined point in time. A video signal processing apparatus according to claim 1, wherein the video color signal and the auxiliary signal are received, and the auxiliary signal is modulated by an auxiliary carrier at any point in time so that the modulated auxiliary signal is occupied by the video color signal at the time point. The modulated auxiliary signal is modulated by occupying only the opposite quadrant of the auxiliary carrier complementary to the opposite quadrant of the carrier, and mixing the modulated auxiliary signal with the video color signal to provide the composite color / auxiliary signal. Mixing means for having a phase difference of 180 degrees with the color signal Video signal processing apparatus. 93. The apparatus of claim 90, wherein the video color signal is a color-under color signal. 93. The apparatus of claim 90, wherein the color carrier is a four-phase carrier wave having a frequency of about 629 KHz, and wherein the video color signal is amplitude-modulated at right angles to the color carrier. 91. The video signal processing apparatus of claim 90, wherein the subcarrier is a four-carrier wave having a frequency of about 629 KHz, and wherein the auxiliary signal is amplitude modulated on the subcarrier. 93. The video signal processing apparatus of claim 90, wherein the subcarrier is a four-phase carrier wave having a frequency of about 250 KHz, and wherein the auxiliary signal is amplitude modulated on the subcarrier. 93. The apparatus of claim 90, wherein the color carriers are moved 90 [deg.] In the same phase in an alternating video field. 93. The apparatus of claim 90, wherein the color carrier and the subcarrier are moved 90 ° in phase in a complementary manner in an alternating video field. 91. The apparatus of claim 90, wherein when the video color signal occupies the first and third quadrants of the color carrier, the auxiliary signal occupies second and fourth quarantines of the subcarrier, and the video color signal is the color carrier. And the auxiliary signal occupies the first and third quadrants of the subcarrier when occupying the second and fourth quadrants of the subcarrier. The video signal processing apparatus according to claim 90, wherein the color carrier is the same as the subcarrier. 93. The video signal processing apparatus of claim 90, wherein the auxiliary signal is a dynamic signal representing a degree of motion picture in a video image. 93. The apparatus of claim 90, wherein the mixing means comprises: color signal modulating means for modulating the video color signal on the color carrier, auxiliary signal modulating means for modulating the auxiliary signal on the auxiliary carrier, and the modulated video color signal and the modulated video color signal; And means for adding an auxiliary signal. 101. The apparatus of claim 100, wherein the color signal modulating means is a downconversion mixer for converting a color component signal modulated with a high frequency carrier into a lower carrier frequency. A video signal processing apparatus according to claim 100, wherein said color signal modulation means and said auxiliary signal modulation means are four-phase modulators. 102. The apparatus of claim 100, wherein the video color signal is an NTSC color component modulated to a color carrier with a frequency of about 3.58 MHz, and wherein the color signal modulating means is about 4.21 MHz to downconvert the video color signal carrier frequency to about 629 KHz. And a four-phase modulator having a carrier frequency. A video signal processing apparatus according to claim 100, wherein said auxiliary signal modulating means is a four-phase modulator having a carrier frequency of about 250 KHz. A video color signal is transmitted from a complex color / auxiliary signal, and the video color signal is modulated into a subcarrier and a video color signal occupying at most two quadrants in opposite directions of the modulated color carrier at a given time. Separating an auxiliary signal component such that the modulated auxiliary signal occupies only the opposite quadrant of the auxiliary carrier complementary to the opposite quadrant of the color carrier occupied by the video color signal at the predetermined point in time; A video signal processing apparatus in which a predetermined auxiliary signal is mixed with the video color signal component as an intercomponent of the complex color / auxiliary signal, wherein the color is received by the video color signal at the time point by receiving the complex color / auxiliary signal. Select from the opposite quadrant of the carrier the video color signal, and In the video signal processing apparatus characterized in that it comprises a separating means for selecting the auxiliary signal from the complementary respective opposite quadrant of the sub-carrier occupied by the auxiliary signal. 107. The apparatus of claim 105, wherein the video color signal is a killer-under color component signal. 107. The apparatus of claim 105, wherein the color carrier is a four-phase carrier wave having a frequency of about 629 MHz, and wherein the video color signal is orthogonally amplitude modulated with the color carrier. 107. The apparatus of claim 105, wherein the secondary carrier is a four-phase carrier wave having a frequency of about 629 KHz, and wherein the secondary signal is amplitude modulated on the secondary carrier. 107. The apparatus of claim 105, wherein the secondary carrier is a four-phase carrier wave having a frequency of about 250 KHz, and wherein the secondary signal is amplitude modulated on the secondary carrier. 107. The apparatus of claim 105, wherein the color carrier is moved 90 [deg.] In the same phase in an alternating video field. 107. The apparatus of claim 105, wherein the color carrier and the subcarrier are moved 90 [deg.] In the same phase in a complementary manner in an alternating video field. 107. The apparatus of claim 105, wherein the auxiliary signal occupies second and fourth quadrants of the subcarrier when the video color signal occupies the first and third quadrants of the color carrier, and the video color signal occupies the color carrier. And the auxiliary signal occupies the first and third quadrants of the subcarrier when occupying the second and fourth quadrants. 107. The apparatus of claim 105, wherein the color carrier and the subcarrier are the same. 105. The video signal processing apparatus according to claim 105, wherein the auxiliary signal is a moving signal representing a degree of motion picture in a video image. 107. The apparatus of claim 105, wherein the separation means receives the complex color / auxiliary signal and passes a signal occupying a pair of opposite quadrants of the complex color / auxiliary signal and in a diagonal direction of the complex color / auxiliary signal. Quadrant select filter means for blocking a signal occupying the inverse quadrant positioned, discriminating means for separating and distinguishing the complex color / auxiliary signal from the output signal passed by the quadrant select filter means, and the quadrant in video field rate And multiplexing means for switching a pair of output signals between the output signal passed by the selection filter means and the distinctive output signal of the discriminating means. A method for processing a wideband video signal into a limited band video signal, comprising: receiving a wideband video signal including at least a baseband video luminance signal and generating a low frequency luminance component having a limited bandwidth in the limited bandwidth and a high frequency luminance component; A first step of reducing the amplitude of the high frequency luminance component by an amount varying according to the amplitude of the high frequency luminance component to de-emphasize the high frequency luminance component, the high frequency luminance component to provide a folded high frequency luminance component A third step of shifting the frequency spectrum of the component to the frequency spectrum of the low frequency luminance component, and adding to the low frequency luminance component having the folded high frequency luminance component to provide a folded video luminance signal having a bandwidth limited to the limited bandwidth; Fourth stage How to process the video signal, characterized by consisting of a. 117. The method of claim 116, wherein the amount of de-emphasis of the high frequency luminance component varies in proportion to the amplitude of the high frequency luminance component. 118. The method of claim 116, wherein the amount of de-emphasis of the high frequency luminance component varies monotonically in relation to the average energy of the high frequency luminance component. 118. The method of claim 116, wherein the de-emphasing of the high frequency luminance component comprises: generating a absolute value signal representing an absolute value of the high frequency luminance component; low-pass filtering the absolute value signal to obtain an average energy of the high frequency component; A second step of providing an average energy signal, a third step of generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy signal, and applying the emphasis gain control signal to the high frequency luminance band component. And a fourth step of multiplying the video signal. A method of processing a wideband video luminance signal as a limited band video luminance signal, the method comprising receiving a wideband video luminance signal, a low frequency luminance component having a limited bandwidth to the limited bandwidth, and a high frequency luminance component having a bandwidth not exceeding the limited bandwidth; A first step of generating, a second step of reducing the amplitude of the high frequency luminance component by an amount varying according to the amplitude of the high frequency luminance component to de-emphasize the high frequency luminance component, to provide a folded high frequency luminance component A third step of moving the high frequency luminance component to the frequency spectrum of the low frequency luminance component, and adding the folded high frequency luminance component to the low frequency luminance component to provide the folded video luminance signal having the limited bandwidth with the limited bandwidth; Phrase as the fourth step to Video signal processing method characterized in that. 124. The method of claim 120, wherein an amount of de-emphasis of the high frequency luminance component varies in proportion to an amplitude of the high frequency luminance component. 124. The method of claim 120, wherein the amount of de-emphasis of the high frequency luminance component varies monotonically in relation to the average energy of the high frequency luminance component. 124. The method of claim 120, wherein the de-emphasing the high frequency luminance component comprises: generating a absolute value signal representing an absolute value of the high frequency luminance component; low-pass filtering the absolute value signal to obtain an average energy of the high frequency component A second step of providing an average energy signal, a third step of generating a de-emphasis gain control signal that is monotonically reduced in relation to the average energy signal, and the de-emphasis gain control in the high frequency luminance band component. And a fourth step of multiplying the signal. A method for converting a limited band video luminance signal to a wideband baseband video luminance signal, the method comprising: a low frequency luminance component having a limited bandwidth in a limited bandwidth and a frequency spectrum of the low frequency luminance component and having an amplitude related to an original amplitude; A first step of receiving a limited band video luminance signal having an emulated high frequency luminance component, having the low frequency luminance component of the limited band video luminance signal together with the high frequency luminance component of the limited band video luminance signal in a folded form A second step of unfolding the limited band video luminance signal to provide an unfolded baseband luminance signal such that a bandwidth of the unfolded baseband luminance signal is greater than the limited bandwidth, and the unfolded high frequency luminance The unfolded high frequency by an amount that varies with the amplitude of the component A third step of increasing the amplitude of the luminance component to provide a wideband baseband video luminance signal having the low frequency luminance component and the unfolded high frequency luminance component, whereby the amplitude of the unfolded high frequency luminance component is emulated; Video signal processing method characterized in that consisting of. 124. The video signal processing method according to claim 124, wherein an amount of emphasization of the unfolded high frequency luminance component is changed in proportion to an amplitude of the unfolded high frequency luminance component. 124. The method of claim 124, wherein the amplitude of the unfolded high frequency luminance component is increased by a monotonically increasing amount associated with the average energy of the unfolded high frequency luminance component. Converts a full-band video luminance signal into a limited-band video luminance signal that holds the luminance information of the full-band luminance signal within the limited bandwidth, and converts the limited-band video luminance signal into a broadband baseband luminance signal corresponding to the full-band video luminance signal. A method for converting, the method comprising: receiving a full-band video luminance signal and generating a low frequency luminance component having a limited bandwidth to a limited bandwidth and a high frequency luminance component having a bandwidth not exceeding the limited bandwidth; A second step of reducing the amplitude of the high frequency luminance component by an amount determined by the amplitude of the second step; moving the high frequency luminance component to the frequency spectrum of the low frequency luminance component to generate a folded high frequency luminance component; Folded high frequency luminance component A fourth step of generating a limited band video luminance signal by adding to a low frequency luminance component; unfolding the limited band video luminance signal and unfolding the low frequency luminance component and the limited band of the limited band video luminance signal A fifth step of generating an unfolded baseband luminance signal having the folded high frequency luminance component of the video luminance signal, and varying the amplitude of the unfolded high frequency luminance component determined by the amplitude of the unfolded high frequency luminance component Increasing by an amount to provide a wideband baseband video signal having the low frequency luminance component and the unfolded high frequency luminance component, whereby the amplitude of the unfolded high frequency luminance component is emulated; A video signal conversion method. 118. The method of claim 117, wherein the amount of de-emphasis of the high frequency luminance component and the amount of emphasization of the unfolded high frequency luminance component vary in proportion to their respective amplitudes. 129. The method of claim 128, wherein the amount of de-emphasis of the high frequency luminance component monotonically increases in relation to the average energy of the high frequency luminance component, and the amount of the emphasis of the unfolded high frequency luminance component is increased. And a monotone decreases in relation to the average energy of the high frequency luminance component. In a limited band video signal capable of moving to a narrow band video medium, a low frequency luminance band component that carries luminance information of an original wideband luminance signal, corresponds to a low frequency band of the original wideband luminance signal, and has a limited bandwidth in the narrowband video signal. And a high frequency luminance band component corresponding to a high frequency band of the original wideband luminance signal, folds into a frequency spectrum of the low frequency luminance band component, and whose amplitude is de-emphasized with respect to the high frequency band of the original wideband luminance signal. A limited band video signal comprising a limited band luminance signal component. 133. The limited band video signal of claim 130, wherein an amount of de-emphasis of the high frequency luminance band component is changed in proportion to an amplitude of the high frequency band of the original wideband luminance signal. 133. The limited band video signal of claim 130, wherein the amount of de-emphasis of the high frequency luminance band component varies monotonically in relation to the average energy of the high frequency band of the original wideband luminance signal. 133. The limited band video signal of claim 130, further comprising a dynamic signal component that carries information indicating a degree of moving image in the original wideband luminance signal. 133. The limited band video signal of claim 130, further comprising a color signal component that carries color information. In a limited band video signal capable of moving to a narrow band video medium, a low frequency luminance band carrying luminance information of an original wideband video signal and corresponding to a low frequency luminance band of the original wideband video signal and having a limited bandwidth in the narrowband video signal A high frequency luminance band component corresponding to a high frequency luminance band of the original wideband video signal, folds into a frequency spectrum of the low frequency luminance band component, and whose amplitude is de-emphasized with respect to the high frequency luminance band of the original wideband video signal. And a limited band luminance signal component having at least a color signal component for carrying the color information of the original wideband video signal, and a copper signal component for carrying information indicating the degree of motion picture in the raw broadband video signal. Limited band video signal. 137. The limited band video signal of claim 135, wherein an amount of de-emphasis of the high frequency luminance band component is changed in proportion to an amplitude of the high frequency band of the original wideband video signal. 137. The limited band video signal of claim 135, wherein the amount of de-emphasis of the high frequency luminance band component varies monotonically in relation to the average energy of the high frequency band of the original wideband video signal. 137. The limited band video signal of claim 135, wherein the color signal component is a color-under-color signal. 137. The limited band video signal of claim 135, wherein the color signal component and the same signal component are mixed to form a composite color / motion signal. 137. The color under component of claim 135, wherein the color signal component is a quadrant amplitude-modulated color-under color signal, and wherein the same signal component comprises a quadrant of the color-under luminance signal complementary to the quadrant occupied by the color signal component at a given point in time. Limited band video signal characterized in that it is carried.