JPH06261294A - Wide television signal transmitter - Google Patents

Abstract

PURPOSE:To send a high-quality wide television signal while keeping the compatibility with the conventional television signal. CONSTITUTION:The sequence scanning wide television signal is applied to letter- box conversion by 4-3 converter 203 and 4-1 converter 204 on the side of transmission. A moving picture reinforcing picture is compressed into 120 horizontal scanning lines per field by vertical LPF 222 and 225 and 3-2 converters 223 and 226 while limiting a band in the vertical direction. These signals are multiplexed on upper and lower black parts and sent by an N7SC encoder 200. The transmitter on the side of reception is constituted by a decoder receiving the signal and reproducing the wide television signal of the original sequence scanning. Two types of moving picture strengthening signals are properly switched by detecting the vertical and time correlation and the switched signals are transmitted. The reception side detects the same correlation and reproduces the original two types of strengthening signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a high image quality and a high aspect ratio as compared with the current television while maintaining compatibility with the current television broadcasting within the transmission band used in the current television broadcasting. The present invention relates to a wide television signal transmission device capable of transmitting an image having a large ratio.

[0002]

2. Description of the Related Art Current color television broadcasting is based on the NTSC system of 525 scanning lines in Japan and the United States.
1 interlaced scanning, luminance signal horizontal bandwidth 4.2 MHz, aspect ratio 4: 3 (for example, refer to: Literature: Broadcasting Technology Sosho Color Television, Japan Broadcasting Corporation, Japan Broadcasting Publishing Association, 1961) However, more than 30 years have passed since it started in 1960.
Meanwhile, various new television systems have been proposed in response to the demand for high-definition screens and the improvement in performance of television receivers. In addition, the contents of the programs to be provided themselves are changing from simple studio programs and relay programs to programs with higher image quality and more realistic images, such as cinema-sized movie broadcasts.

Against this background, a wide television signal broadcasting system has been proposed which is compatible with the current broadcasting and has a wide screen. One of them is Figure 3.
This is known as the so-called letter box method shown in (b), and the number of effective scanning lines is 480 per frame.
The book is compressed into 360, and black portions (hereinafter, referred to as non-image portions) are left at the top and bottom. By doing so, the aspect ratio becomes 16: 9, but since the vertical resolution drops, it is separately transmitted as a vertical reinforcement signal to prevent this. Further, when a signal source using 1: 1 sequential scanning is used as a signal source, it is conceivable to transmit a so-called moving image reinforcement signal generated at the time of conversion into 2: 1 interlaced scanning. It is considered that this moving image reinforcement signal is transmitted in the upper and lower non-image parts. Further, in order to increase the horizontal resolution, the existing horizontal bandwidth of 4.2 MHz is expanded, and a band of more than that is multiplexed and transmitted as a horizontal reinforcement signal in the screen by some method.

FIG. 3 (b) shows an overview of an image of a wide-screen television signal subjected to letterbox conversion. In the upper and lower non-picture areas, there are 30 scanning lines per field, and the scanning lines in the center. The main screen has an aspect ratio of 16: 9 and 180 lines per field. Wide television signal has 525 horizontal scanning lines and 1: 1 sequential scanning,
The luminance signal horizontal frequency band is about 4.2 MHz to 6.0 MHz. The number of effective scanning lines is 480.
On the other hand, a normal television signal which has been conventionally used has a horizontal scanning frequency band of about 5.25 lines and a horizontal frequency band of about 4.2 MHz. It is mainly used in television broadcasting by the current NTSC system.

Wide television signals are currently available in NTSC
525 scanning lines to maintain compatibility with the transmission path when transmitting while maintaining compatibility with television broadcasting by the system,
Signal processing for conversion into 2: 1 interlaced scanning is required, but the signal generated by this conversion processing is a moving image reinforcement signal, and if this is transmitted using some means, it will be 2: 1 on the receiving side. There are advantages such as facilitating reverse conversion from interlaced scanning to 1: 1 sequential scanning. Usually, this moving image reinforcement signal is transmitted in the upper and lower non-image parts.

[0006]

In such a wide television signal transmission device, the upper and lower non-picture portions are 120 per frame, and the moving image reinforcement signals are 180 per frame. Therefore, all of this is insufficient for transmission in the non-picture part, and if it is multiplexed as it is, the interference when viewed with the current receiver becomes remarkable. Therefore, it is necessary to provide some kind of restriction such as band limitation without reducing the effect of the moving image reinforcement signal as much as possible.

The present invention has been made in view of such a problem, and the interference with the current receiver by the moving image reinforcement signal transmitted in the non-image portion is minimized while maintaining the compatibility with the current television broadcasting. , A wide television signal transmission device is provided.

[0008]

In order to solve the above problems, in the wide television signal transmission apparatus of the present invention, 240 scanning line difference signals (LD signals) per frame (120 per field) are used as moving image reinforcement signals. Band) to multiplex the upper and lower non-image areas. Further, if necessary, this signal is modulated and multiplexed on the upper and lower non-picture areas, thereby reducing the interference of the non-picture areas when received by the current receiver. Further, both the scanning line difference signal (LD signal) and the frame difference signal are adaptively switched according to the correlation coefficient of neighboring pixels and transmitted, so that the upper and lower non-image parts when received by the current receiver Reduce interference with.

[0009]

According to the present invention, by the above method, the number of scanning lines compatible with the conventional method is 525, 2: 1 interlaced scanning,
While maintaining the format of luminance signal horizontal bandwidth 4.2MHz,
A wide-screen television signal with high image quality can be transmitted. Further, the influence of the interference of the non-picture part when received by the current receiver is visually small, and the moving image reinforcement signal can be multiplexed and transmitted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wide television signal transmission apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an encoder in an embodiment of the wide television signal transmission apparatus of the present invention. A progressive scanning wide television signal source 100 having 525 horizontal scanning lines (480 effective scanning lines) and an aspect ratio of 16: 9 outputs a luminance signal Y and color difference signals I and Q. A vertical LPF (low pass filter) 201 converts the effective scanning lines from 480 lines to 360 lines.
The vertical resolution is limited to prevent aliasing, and the vertical resolution is limited to 360 TV lines or less. Next, this output signal is input to the 4-3 converter 203 and subjected to so-called letter box processing for converting from 480 scanning lines to 360 scanning lines. This processing is easily realized by generating four to three scanning lines. Specifically, it is realized by once increasing the number of scanning lines tripled to 1440, and then selecting one of the four scanning lines.

When such letterbox processing is applied to the main screen, the vertical resolution is reduced from 480 TV lines to 360 TV lines, and 120 TV lines are lost. Therefore, it is usually considered that this lost component is separately extracted and transmitted. That is, the vertical HPF 202 extracts vertical high-frequency components (components corresponding to 360 TV lines to 480 TV lines) of the luminance signal. Further 4-1 converter 20
At 4, 480 scanlines are converted to 120 without losing information. In this way, the vertical reinforcement signal VH of 120 luminance signals is generated at the output of the 4-1 converter 204. The vertical reinforcement signal VH is obtained only for the luminance signal, and is usually not processed for the color difference signal.

Although various methods of processing the vertical reinforcement signal VH can be considered, a method of time axis compression is shown here as an example. This VH signal is input to the horizontal LPF 205 and the horizontal band is limited to 2.1 MHz which is half of the main signal. Further, the time axis compression circuit 206 compresses the time axis in half. As a result, it is possible to transmit 60 upper and lower non-picture portions per field of the NTSC system signal.

Next, the output signal of the 4-3 converter 203 converted into 360 lines is the vertical LPF 207 and the vertical HPF 22.
0, and further input to the frame differentiator 224. First, the signal paths forming the main screen will be described. Vertical L
The PF 207 mainly aims to reduce flicker when the main screen is viewed by a current receiver. If flicker has already been reduced by the filter 201, this may be omitted. The progressive-interlacing converter 208 is for converting a progressive scanning signal into an interlaced scanning signal, and thins out 180 scanning lines from 360 scanning lines and extracts them. In this way, the output of the sequential-to-interlace converter 208 is 1 per field in the main screen section.
There will be 80 lines, and no signal will be present in each of the upper and lower 30 non-image parts, and the signals will be compatible with NTSC signals. The output of the sequential-to-interlace converter 208 is NTSC.
The luminance signal Y and the color difference signal I are input to the encoder 209.
And Q are combined into an NTSC signal.

Next, the signal path of the moving image reinforcement signal will be described in order. The moving image reinforcement signal is obtained by extracting components lost when converted by the sequential-to-interlace converter 208, and is particularly effective when transmitting a moving image. There are two types of moving image enhancement signals, FD signal and LD signal, and both types are transmitted in the present embodiment, but only the LD signal may be transmitted. Also, the moving image reinforcement signal is obtained only for the luminance signal.

The generation of the video enhancement signal LD begins in the vertical HPF 220. Here, LD is extracted as a vertical high frequency component. LD is originally to find a line difference in a frame, and is equivalent to finding a vertical high-frequency component with a vertical HPF. General vertical HP
The characteristics of F are shown in FIG. Next, the low frequency shift 221
Converts the signal component to the vertical low range with. This process is usually 3
This can be performed by selecting 60 to 180 scanning lines. Further, since the pass band is approximately 60 to 180 due to the characteristics of the vertical HPF 220, 120 scanning lines are sufficient. Therefore, next, the vertical LPF 222
Then, the band is limited to 120 lines, and the 3-2 converter 223 converts the scanning lines from 180 lines to 120 lines.

Next, the generation of the moving image reinforcement signal FD will be described. The output of the 4-3 converter 203 is the frame differentiator 2
It is input to 24 and the difference of 2 frames is calculated. There are various methods of obtaining the frame difference, but if the difference between the 180 scanning lines that are not transmitted and the scanning lines that are transmitted one frame before is calculated, the required number of scanning lines for the FD signal is 180. Next, the vertical LPF 225 limits the vertical band to 120 lines and the 3-2 converter 226 converts the vertical band to 120 lines. The moving image enhancement signals LD and FD are combined by the combiner 211. The synthesizing method in this synthesizer will be described later in detail as one embodiment of the present invention, but it also includes selecting only the LD and selecting either one for each field.

The 120 moving image reinforcement signals per field and the 60 vertical reinforcement signals per field thus combined are combined with the main signal by the combiner 210.
In the combiner 210, the NTSC-encoded main signal from the NTSC encoder 209 is switched during 180 letterbox periods, and either or both of the moving image reinforcement signal and the vertical reinforcement signal are switched and synthesized in the upper and lower non-image areas. It The output of the combiner 210 is transmitted like a normal NTSC signal. The details of the synthesizer 210 will also be described later in detail.

FIG. 3B shows an example of how the video signal output from the synthesizer 210 looks. This is a case where the video enhancement signal LD or FD is transmitted in the upper and lower non-image parts, and 120 video enhancement signals per field are multiplexed by compressing the horizontal band in half and the time axis in half. Is. As described above, if there are 180 video enhancement signals per field, both horizontal band and time axis are 1 /
It needs to be compressed to 3, but half here would be fine. In particular, if the time axis is greatly compressed, it is necessary to expand the data in reverse at the time of reproduction on the receiving side. However, if the expansion ratio is large, noise mixed during transmission is expanded laterally, which is not visually preferable. In this respect, in this embodiment, the number of vertical HPFs is set to 120 per field in consideration of the characteristics of the vertical HPF at the time of LD generation, so that the advantage can be utilized.

Next, the function of the moving image reinforcing signal will be described with reference to FIG. 4 including the processing on the receiving side. FIG. 4 illustrates an example of an LD signal as a moving image reinforcement signal, which describes a process in the sequential-to-interlace converter on the transmitting side and a corresponding process on the receiving side as a conventional example. Already 4-3
When converting the converted progressive scan signal to an interlaced signal in order to maintain compatibility with the current NTSC signal, the scan lines marked with ◯ are transmitted as they are, and the scan lines marked with x are not transmitted. For example, the scanning lines b and d marked with X take the difference from the average of the upper and lower scanning lines in the same frame, and the difference is calculated.
Transmit as D. That is, the moving image reinforcement signal t (i),
t (i + 1) is b- (a + c) / 2, d- (c
+ E) / 2. Here, i represents the i-th LD signal, and there are 180 LD signals for each frame. This process corresponds to the process in the vertical HPF 220 of FIG.

The scanning line marked with ○ is NT.
It is directly applied to the main screen portion of each field of the interlaced scanning signal compatible with the SC system signal. on the other hand,
Since there are 60 non-image parts in the upper and lower fields, L
The D signal needs to be band-compressed to 1/3 and compressed on the time axis. In the conventional example, as shown in FIG.
After the band was limited to MHz, the time axis was compressed to 1/3 and multiplexed, so that the upper and lower non-image parts are divided into three parts. On the receiving side, an untransmitted X signal is generated from the LD signal and the transmitted O signal to reproduce the original progressive scanning signal. However, the LD signal is 1.
Since it is band-limited at 4 MHz, the original signal cannot be completely restored at frequencies higher than that.

Next, the types of moving image reinforcement signals will be described with reference to FIG. FIG. 5 illustrates a method of generating four types of moving image reinforcement signals by comparing them. In the figure, (a) is the LD signal already described, and (b) is the first FD signal, which is characterized in that it is processed across frames, and is at the same vertical position between frames. The difference between scan lines is determined. Further, (c) is the second FD signal, and although the difference in the same position between frames is also obtained, the difference direction is always the same. (D) weights the LD signal and the FD signal by the correlation coefficient k,
When the vertical correlation coefficient is large, only the scanning line difference signal LD is transmitted, and when the time correlation coefficient is large, the frame difference signal FD is transmitted. As a result, the signal power to be transmitted can be reduced, so that there is little interference in existing receivers.

FIG. 6A shows the combiner 2 shown in FIG.
11 shows a configuration example of 11. 120 moving image reinforcement signals per field can be switched for each pixel between the FD signal and the LD signal by the correlation coefficient k detected from the main screen. Further, if k = 1 or 0 is forcibly set, either the FD signal or the LD signal is selected regardless of the correlation. The moving image reinforcement signal thus obtained can be transmitted in the upper and lower non-image parts of 60 lines per field by compressing the band and time axis in half. Further, as a method of further reducing interference, for example, quadrature modulation can be performed using a carrier of 4/7 fsc (where fsc is a color subcarrier). In this case, the video reinforcement signal needs to be halved in band,
It is not necessary to halve the time axis. When modulated with a carrier wave, the component near DC where the energy of the reinforcement signal is large is 2M.
Since it is in the vicinity of Hz, there is an advantage that it is hard to see. Further, since the time axis is not halved, it is not necessary to expand the time axis on the receiving side, and it is possible to eliminate the drawback that noise is expanded laterally and expands so that it is easily noticeable.

Next, the principle of detection by the correlation detector 2112 shown in FIG. 6A will be described with reference to FIG. 5D. Now, let us say that the scanning line of interest is b, and ki is obtained as the correlation coefficient. ki is a correlation coefficient in the time direction, and takes a value from 0 to 1, and the correlation coefficient in the time direction becomes maximum at 1. First, for the vertical correlation, the absolute value of the difference between the scanning lines a and c is obtained. There are two ways to obtain the correlation coefficient in the time direction: the absolute value of the difference between v and b ′ or the average of the absolute value of the difference between a and u ′ and the difference between c and x ′. Conceivable. In the latter case, there is an advantage that a frame memory for detecting the correlation is unnecessary. When the time correlation is larger than the vertical correlation, ki is set close to 1, and in the opposite case, ki is set close to 0. When the vertical correlation and the time correlation are almost the same, ki may be set to 0.5.

FIG. 6B is a synthesizer 210 shown in FIG.
A configuration example of is shown. A total of three signals, that is, the moving image reinforcement signal supplied from the synthesizer 211, the vertical reinforcement signal input from the time axis compressor 206, and the main screen signal from the NTSC encoder 209 are input to this synthesizer. In this synthesizer, the motion detector 2102 detects from the input main screen signal whether the entire screen is moving or stationary. If a part of the screen is moving, it is determined to be moving. This motion information is the first switching circuit 210.
1 and the video enhancement signal and the vertical enhancement signal are normally switched in field units. The video augmentation signal is selected when moving, and the vertical augmentation signal is selected when stationary,
It is supplied to the second switching circuit 2103. In the second switching circuit 2103, the main screen signal is selected in the main screen portion, and the reinforcement signal from the first switching circuit 2101 is selected in the upper and lower non-image areas. The output of the second switching circuit 2103 becomes a desired wide television video signal.

FIG. 2 is a block diagram of a decoder on the receiving side in an embodiment of the wide television signal transmitting apparatus of the present invention. Hereinafter, description will be made in order with reference to the drawings.

The wide television signal encoded on the transmitting side is received, and the baseband signal demodulated by the tuner and the video detection circuit is input to the reinforcing signal separator 301. The separator 301 separates the vertical reinforcement signal VH, the moving image reinforcement signal, and the main screen and outputs them. The output signal including the main screen is input to the NTSC decoder 309 and separated into a luminance signal Y and color difference signals I and Q. On the other hand, the vertical reinforcement signal VH is input to the time axis expander 305 and the time axis is doubled. Further, the signal expanded in the time axis has a horizontal band of 2.1M by the horizontal LPF 308.
Limited to Hz.

The moving image reinforcing signal is doubled in the time axis by the time axis expander 318, and then the FD signal and the L signal are separated by the separator 302.
It is separated into D signals. If only the LD signal is transmitted, the separator 302 is unnecessary. Further, when the moving image reinforcement signal is not time-axis processed, the time-axis expander 318 is not necessary. If the signals are quadrature-modulated and multiplexed, the quadrature demodulator is required at the position of the time-base expander 318. In this case, the reproduction of the carrier is easily realized by using the color subcarrier.

The separated LD signal and FD signal have 120 scanning lines, but usually from low frequency (DC) to 120T.
It includes up to V signal components. Both are vertical LPF
It is input to 303 or 304 and the band other than the signal band is removed. These signals are then sent to the 2-3 converter 306.
Or input to 307 and scan lines from 180 to 180
Convert to a book. This 2-3 conversion is well known,
This is realized by the process of once increasing the number of input scanning lines from 120 to 360 to 360 by inserting 0 between them and then selecting one out of two after passing through the LPF. The LD signal which has become 180 scanning lines by such processing is converted by the high frequency shift circuit 317 into a signal band from 60 TV lines to 180 TV lines. The other FD signal remains unchanged.

A moving image reinforcement signal subjected to such processing,
The LD signal and the FD signal are supplied to the interlace-sequential converter 310 and used there. The operation of the jump-sequential converter 310 has already been described with reference to FIG. 4, but from the 180 main screen signals and 180 LD or FD signals, 360
The original progressive scan signal of the book is reproduced. The original 360 progressive scanning signals reproduced in this manner are subjected to 3-4 conversion by the scanning line converter 311, and 480 progressive scanning wide television signals are reproduced. The vertical reinforcement signal output from the horizontal LPF 308 is supplied to the scanning line converter 311, and serves to add components corresponding to 360 TV lines to 480 TV lines to the main signal. Vertical reinforcement signals are usually
In many cases, it is transmitted by switching to the moving image reinforcement signal by the identification signal for each field, but in that case, it may not be transmitted by the field.

FIG. 7 shows a detailed structure of the separator 302 shown in FIG. When the moving image reinforcement signal is transmitted by the identification signal for each field, it is considered that the LD signal and the FD signal are mixed and transmitted. The separator shown here shows the configuration of a circuit for separating the LD signal and the FD signal by detecting the correlation between the vertical direction and the time direction based on the signal transmitted on the main screen. NTSC decoder 3
09 input the signal of the main screen to the correlation detector 3022,
Corresponding to the scanning line of the moving image reinforcing signal transmitted mainly from the luminance signal, it is determined which of the vertical correlation and the temporal correlation is dominant, and the correlation coefficient k is obtained. Here, k takes a value from 0 to 1.
Further, k may take only a value of 0 or 1. The moving image reinforcement signal separator 3021 selects an LD signal or an FD signal from the input reinforcement signal according to the correlation coefficient k. This choice presupposes that the sender and the receiver promise in advance.

The separation method using such a correlation coefficient has a great advantage in reducing the interference in the non-image area. This is because the time correlation is generally low in the case of a moving image and the FD signal is large in that case, so the LD signal is transmitted. On the other hand, when the image is close to a still image, the vertical correlation is low, and in that case the LD signal is large, so the FD signal is multiplexed. Whichever signal is transmitted, it is possible for the receiving side to restore the original progressive scan signal. Adaptive processing by motion detection is considered as a method close to the correlation coefficient. This is F when the movement is large
Since the D signal is large, the LD signal is transmitted, and when the motion is small, the LD signal is large and therefore the FD signal is transmitted. In the case of this motion detection, since it can be said that motion detection generally detects a correlation in the time direction, there is a drawback in that vertical correlation is not observed. By detecting both the time correlation and the vertical correlation on the transmitting side and the receiving side, it is possible to perform transmission with higher accuracy than mere motion detection and to be strong against distortion such as transmission noise.

FIG. 8 is a block diagram of an encoder on the transmission side of a wide television signal transmission apparatus according to another embodiment of the present invention. Hereinafter, description will be given with reference to the drawings.

This encoder is characterized in that both the LD signal and the FD signal transmitted as a moving image reinforcement signal have 180 scanning lines, and both are subjected to adaptive processing based on correlation detection. The block is the same as the encoder shown in FIG. A wide television signal source 100 is used as a signal source and is characterized by 525 scanning lines and a 1: 1 sequential scanning with an aspect ratio of 16: 9. The output of the signal source 100 is the vertical LPF 201 and the vertical H.
It is input to both of the PFs 202. The vertical HPF 202 extracts vertical high-frequency components from 360 TV lines to 480 TV lines, and further converts the scanning lines into 120 lines by the 4-1 converter 204 to form the high-frequency reinforcing signal VH. This high frequency reinforcement signal has a horizontal LPF 205 and a horizontal band of 2.1 MHz.
And the time axis compressor 206 compresses the time axis in half.

On the other hand, the vertical LPF 201 has a vertical band of 36.
After being limited to 0 TV lines, the number of scanning lines is converted from 480 to 360 by the 4-3 converter 203. This output is supplied to the vertical LPF 207 that constitutes the main screen, the frame difference unit 224 that generates the FD signal, and the vertical HPF 20 that generates the LD signal. Main screen system is vertical LPF
At 207, the band is further limited to reduce flicker, and then converted to an interlace signal by a sequential-interlace converter 208.

Frame differencer 2 for generating the FD signal
At 24, the difference between the frames is calculated. At this point, there are 180 scanning line signals per frame. An LD signal is generated by the vertical HPF 220 for generation of the LD signal, but at this point, it becomes a signal of 180 scanning lines. In the weighting circuit 211, the FD is calculated based on the output of the correlation detector 227.
The signal and the LD signal are weighted and added. Various methods can be considered for this method, but one example is as already described. The luminance signal of the output signals from the sequential-to-interlace converter 208 is input to the correlation detector 227.

The moving image reinforcement signal generated in this manner is a mixed signal for each pixel of the FD signal and the LD signal, but can be separated on the receiving side without transmitting the correlation coefficient, and if necessary, the original signal can be obtained. It is also possible to directly obtain the signal of. The above vertical reinforcement signal and this moving image reinforcement signal are switched by the first switch 230 under the control of the motion detector 228. The motion detector 228 determines the motion (binary) for each field based on the output signal of the sequential-to-interlace converter 208, and determines which of the moving image reinforcement signal or the vertical reinforcement signal is to be multiplexed in the non-image part. To do.

Signals including the main screen are sequentially-interlaced converter 20.
It is converted into an interlaced signal in 8 and inputted to the NTSC encoder 209, where it is encoded into an NTSC signal. N
The TSC-encoded signal is input to the second switch 210, and the reinforcing signal from the first switch 230 is switched so as to be multiplexed in the non-image portion. Finally, the second switch 21
The 0 output is transmitted as a wide television signal compatible with NTSC signals.

FIG. 9 is a block diagram of the receiving side of a wide television signal transmitting apparatus according to another embodiment of the present invention.
2 is different from FIG. 2 in that LD signals are not limited to 120 lines, and LD signals and FD signals are adaptively mixed by a correlation coefficient and transmitted. Hereinafter, description will be given with reference to the drawings.

The transmitted wide television signal is input to the reinforcement signal separator 301 as a baseband signal via the tuner and the detector. Reinforcement signal separator 3
At 01, the vertical reinforcement signal VH, the moving image reinforcement signal, and the main screen are separated. Signals including the main screen are NTSC decoder 3
09, and is separated into a luminance signal Y and color difference signals I and Q. On the other hand, the vertical reinforcing signal VH has its time axis doubled by the time axis expander 305, and the horizontal band is limited to 2.1 MHz by the horizontal LPF 308. The moving image reinforcement signal is input to the vertical LPF 303, and is limited to the vertical band of the transmitted signal, 180 TV lines. Next, the time axis compressor 3
It is input to 12 and the time axis is compressed three times, and the horizontal LPF 315 further limits the horizontal band to 1.4 MHz.
The correlation coefficient is detected by the correlation detector 313 to obtain the correlation coefficient ki. The correlation coefficient is detected from the luminance signal in the output signal of the NTSC decoder 309, and the calculator 314 calculates an interpolation signal in advance from the correlation coefficient and the scanning line transmitted. In the adder 316, the horizontal LPF 31
The motion picture reinforcement signal ti output from 5 and this interpolation signal are added to obtain the original signal. However, since there are 180 moving image reinforcement signals and 60 lines can be transmitted, the time axis is compressed to ⅓, so that the horizontal band is transmitted only up to 1.4 MHz. Therefore, the original signal cannot be completely restored.

In the interlace-sequential converter 310, the original 360 progressive scanning signals are formed from the 180 transmitted scanning lines and the 180 untransmitted scanning lines reproduced by the adder 316. . This progressive scanning signal is subjected to so-called 3-4 conversion in which 360 lines are converted into 480 lines by the scanning line converter 311. In this converter, horizontal LP
The vertical reinforcement signal supplied from F308 is added to reproduce the original wide television signal having a vertical resolution of up to 480 TV lines.

[0042]

As is apparent from the above description, the so-called letterbox type wide EDTV which widens the screen while maintaining compatibility with the current television broadcasting system.
In the present invention, the present invention reduces the required number of scanning lines of the moving image reinforcement signal to 120 and reduces the compression rate to 1/2.
, Or by quadrature modulation without compression, or by adaptively multiplexing with a correlation coefficient, the required video reinforcement signal is interfered as much as possible by using the upper and lower non-image parts of the letterbox screen. So as to reduce the amount of noise, and reproduce it on the receiving side to restore the original progressive scan wide television signal. Further, even when a moving image is reproduced, an excellent image with less flicker can be transmitted due to the effect of the moving image reinforcement signal.

[Brief description of drawings]

FIG. 1 is a block diagram of an encoder on a transmission side of a wide television signal transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a decoder on the receiving side of the wide television signal transmission apparatus according to the embodiment of the present invention.

FIG. 3A is an explanatory diagram of a vertical HPF, and FIG. 3B is a diagram illustrating a method of multiplexing moving image reinforcement signals according to the present invention.

4A is an explanatory diagram related to generation and reproduction of a moving image enhancement signal LD according to a conventional example, and FIG. 4B is an explanatory diagram related to generation and reproduction of a moving image enhancement signal LD according to a conventional example.

5A is an explanatory diagram related to generation of a moving image enhancement signal of an LD method, FIG. 5B is an explanatory diagram related to generation of a moving image enhancement signal of a first FD method, and FIG. 5C is a description related to generation of a moving image enhancement signal of a second FD method. FIG. 6D is an explanatory diagram regarding generation of a video enhancement signal of the LD / FD mixed method.

6A is a detailed block diagram of a combiner 211 used in the embodiment of the present invention shown in FIG. 1, and FIG. 6B is a detailed block diagram of a combiner 210 used in the embodiment of the present invention shown in FIG. Block Diagram

FIG. 7 is a detailed block diagram of a separator used in the embodiment of the present invention shown in FIG.

FIG. 8 is a block diagram of a transmitter encoder of a wide television signal transmission device according to another embodiment of the present invention.

FIG. 9 is a block diagram of a decoder on the receiving side of a wide television signal transmission device according to another embodiment of the present invention.

[Explanation of symbols]

 100 Wide Television Signal Source 208 Sequential-Interlace Converter 210, 211 Combiner 220 Vertical HPF 222, 225, 303, 304 Vertical LPF 310 Jump-Sequential Converter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Handa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hideyo Kamihata, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Takaya Hayashi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yasushi Ogata, 1006 Kadoma, Kadoma City Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Akira Kisoda 1006 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (12)

[Claims] 1. A wide television signal having an aspect ratio of 16: 9 is transmitted while being compatible with the current television signal standard having an aspect ratio of 4: 3. All the information of the wide television signal is inserted into the upper and lower sides of the screen, and between the scanning lines of 120 lines among the information lost when the wide television signal is converted from the progressive scanning to the interlaced scanning. A wide television signal transmission device on the transmission side, which multiplexes and transmits a difference signal. 2. The wide television signal transmission device on the transmission side according to claim 1, wherein the time axis of the scanning line difference signal is compressed and transmitted. 3. A wide television signal transmission apparatus on the transmitting side according to claim 1, wherein the scanning line difference signal is transmitted by orthogonal modulation of the subcarrier without compressing the time axis. 4. The wide television signal transmission apparatus on the transmitting side according to claim 1, wherein the frequency of the subcarrier for modulating the scanning line difference signal is 4/7 times that of the color subcarrier. 5. A wide television signal having an aspect ratio of 16: 9 is transmitted while being compatible with the current television signal standard having an aspect ratio of 4: 3. 4 has all the information of the wide television signal inserted therein, and among the information lost when the wide television signal is converted from the progressive scanning to the interlaced scanning in the upper and lower 1/8 parts of the screen respectively, A wide television signal transmission device on the transmitting side, which multiplexes and transmits both inter-frame difference signals. 6. An inter-scan line difference signal and an inter-frame difference signal are judged by both vertical correlation and temporal correlation at a scanning line position of interest and the difference signal having the stronger correlation is transmitted. The wide television signal transmission device on the transmitting side according to claim 5. 7. A wide television signal having an aspect ratio of 16: 9 is sequentially scanned from approximately 3/4 of the central portion in the vertical direction of the screen and from approximately 1/8 of the upper and lower portions of the screen by the wide television signal. A device for receiving a signal compatible with the current method, which is multiplexed with 120 scanning line difference signals among information lost when converting to interlaced scanning, and 120 scanning lines transmitted It has a first converting means for converting the inter-difference signal into 180 lines and a second converting means for converting a wide television signal transmitted as a vertical center portion of the screen into a progressive scanning signal. A wide television signal transmission device on the receiving side, which is configured. 8. The time axis of the scanning line difference signal for 120 lines is set to 2
8. The wide television signal transmitting device on the receiving side according to claim 7, wherein the original signal is restored by expanding the signal twice. 9. The receiving wide television signal transmission apparatus according to claim 7, wherein the original signal is restored by orthogonally demodulating the scanning line difference signal orthogonally modulated by the subcarrier. 10. The reception according to claim 7, wherein the frequency of the reproduction subcarrier for quadrature demodulating the scanning line difference signal quadrature-modulated by the subcarrier is 4/7 times that of the color subcarrier. Side wide television signal transmission device. 11. A wide television signal having an aspect ratio of 16: 9 is sequentially scanned from approximately 3/4 of the vertical center of the screen to approximately ⅛ of the upper and lower portions of the screen. A device for receiving a signal compatible with the current system, in which both a scanning line difference signal and a frame difference signal are multiplexed among information lost when converting to interlace scanning, said scanning line difference signal And a wide-screen television signal transmitted as a central portion in the vertical direction of the screen corresponds to the lost information. A wide television signal transmission device on the receiving side, comprising: a conversion means for converting a signal into a progressive scanning signal. 12. A current method in which a difference signal having a strong correlation is multiplexed by judging a difference signal between scanning lines and a difference signal between frames by both correlation in the vertical direction and correlation in the time direction at a scanning line position of interest. It has a means for receiving a signal compatible with, and for obtaining the correlation coefficient by the receiving side independently, and by the obtained correlation coefficient, the original signal of the transmitted scanning line difference signal and frame difference signal. The wide-side television signal transmission device on the receiving side according to claim 11, wherein