JPH06268970A - Video signal processor - Google Patents

Abstract

PURPOSE:To process video signals in the various kinds of signal forms including EDTV signals with improved picture quality at all times. CONSTITUTION:This processor is for discriminating the kinds of the multiple kinds of the video signals including the EDTV signals for which picture pattern signals for indicating picture information and auxiliary signals relating to the picture pattern signals are time-division-multiplexed and performing a video signal processing corresponding to the discriminated kind of the video signals and is provided with a detection means for detecting that the incoming video signals are the video signals supplied from a video signal recorder 1 and/or a reproducing device 2 and a video signal processing means for performing the video signal processing with only the EDTV signals for which the auxiliary signals are turned to a base band as the EDTV signals when the detection means detects the video signals supplied from the video signal recorder 1 and/or the reproducing device 2 and performing the video signal processing with the EDTV signals for which the auxiliary signals are modulated or encoded as the EDTV signals when the detection means detects the video signals supplied other than from the video signal recorder 1 and/or the reproducing device 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing device.

[0002]

2. Description of the Related Art FIG. 10 is a diagram for explaining an image of a letterbox system, and FIG. 11 is a diagram for explaining an EDTV signal. A conventional technique will be described below with reference to the drawings.

In recent years, a method of transmitting a high-quality horizontal image having an aspect ratio of 16: 9, which is compatible with a conventional television receiver having an aspect ratio of 4: 3 (hereinafter referred to as a TV receiver), has been studied. Has been done. As one of them, when displaying on a conventional TV receiver, black portions are formed in the upper and lower portions of the screen as shown in FIG. 10 and a horizontally long (16: 9 aspect ratio) image is formed in the central portion. There is a letterbox system for displaying, and in order to obtain a high quality image when displaying it on a TV receiver having an aspect ratio of 16: 9, the high frequency component in the vertical direction or It has been proposed to insert a high frequency component in the horizontal direction and a high frequency component in both directions as auxiliary signals dd1 and dd2. As this auxiliary signal, a so-called VSB-modulated modulation auxiliary signal in which the carrier is suppressed or a digitally modulated (encoded) modulation auxiliary signal can be considered. From this point on, signals of this type will be sent to the EDT.
It will be referred to as a V signal and is illustrated in FIG. In addition, EDT
In order to make it possible to determine whether or not it is the V signal aa, the determination signal bb is inserted in a predetermined line within the vertical blanking period as shown in FIG. An example of such an EDTV signal is the "PAL p" which is being studied in Europe.
lus ”and the like.

However, the above-mentioned EDTV signal aa
When recording / reproducing data on / from the conventional video signal magnetic recording / reproducing apparatus (VTR), since this recording / reproducing apparatus is not a recording / reproducing apparatus compatible with the EDTV signal, this EDTV signal is not an EDTV signal but a format of the conventional recording / reproducing apparatus. It becomes a video signal to be recorded and played back. At this time, the following (1)
Due to the problem of (3), EDTV recorded in this way
When the signal is reproduced, the reproduced auxiliary signal is a signal that cannot be demodulated (decoded) by the modulation auxiliary signal demodulator (decoder).

(1) Since the auxiliary signal is not limited to a signal having a line correlation, the reproduced video signal to the luminance signal (EDT
There is a drawback that deterioration occurs due to the luminance signal comb filter using a predetermined line correlation used when separating the V signal).

(2) When the auxiliary signal is a VSB-modulated auxiliary signal, a carrier that follows jitter for demodulating the auxiliary signal is required at the time of reproduction, and a correction circuit having a complicated structure for jitter correction is required. Without it, no good auxiliary signal was obtained. Further, the VSB-modulated modulation auxiliary signal generally requires a wideband transmission system capable of transmitting up to a high frequency band near the carrier, and has a drawback that it cannot be recorded / reproduced by a wideband video signal magnetic recording / reproducing apparatus.

(3) When the auxiliary signal is a digitally modulated (encoded) auxiliary signal, an error correction code addition circuit and an error correction circuit are required for recording and reproduction, and a clock signal is reproduced. It is also necessary, and there is a drawback that the recording / reproducing apparatus becomes complicated.

Therefore, in order to solve the problems (1) to (3) described above, Japanese Patent Application No.
There is No. 30146 "Video signal magnetic recording device". This is a video signal magnetic recording device for recording a video signal in which a picture signal representing image information and an auxiliary signal relating to the picture signal are time-division multiplexed, and a luminance signal is separated and output from the video signal. No. 1 filter means, demodulation means for converting the auxiliary signal into a base band without passing through the first filter means, a signal related to the output of the demodulation means at least during the period when the auxiliary signal exists, and a luminance signal during the other periods. And a second filter means for separating and outputting a color signal from the video signal, and a color signal recording means for low-frequency converting the color signal. A video signal magnetic recording device characterized by frequency-multiplexing and recording a signal related to the output and a signal related to the output of a recording color signal system.

[0009]

A recording system for performing the same recording signal processing as the recording system of the above-mentioned "video signal magnetic recording apparatus", and a reproduction signal processing of a structure complementary to this recording system at the time of reproduction will be described below. And a video signal magnetic recording / reproducing apparatus which performs a recording / reproducing process compatible with an EDTV signal.
It is called a "new recording / reproducing device".

Further, the recording / reproducing process corresponding to the EDTV signal cannot be performed like the above-mentioned "new recording / reproducing apparatus", and the EDTV signal is recorded as a video signal having an aspect ratio of 4: 3 without being distinguished from the conventional TV signal. A conventional video signal magnetic recording / reproducing apparatus that performs a reproducing process will be referred to as a “conventional recording / reproducing apparatus”.

By the way, with the "new recording / reproducing apparatus" or "conventional recording / reproducing apparatus" connected to an EDTV-compatible receiver (hereinafter referred to as EDTV receiver) compatible with EDTV signals, a video tape (recording) currently being reproduced is recorded. It is determined whether the used recording medium) is a new recording / reproducing apparatus or a conventional recording / reproducing apparatus for recording the EDTV signal.
Correctly detected on the DTV receiver side, and corresponding EDTV
If the corresponding image receiving process is not performed, the EDTV signal reproduced from the "new recording / reproducing device", which is the baseband auxiliary signal already demodulated and converted into the baseband in the auxiliary signal processing circuit in the EDTV receiver. There is a problem in that the image quality is deteriorated by performing an erroneous image receiving process such as further demodulating the baseband auxiliary signal.

[0012]

In order to solve the above problems, the present invention provides a video signal processing device having the following configuration.

A plurality of types of video signals including an EDTV signal in which a picture signal representing image information and an auxiliary signal related to the picture signal are time-division multiplexed are discriminated, and the types of the discriminated video signals are determined. A video signal processing device for performing video signal processing, wherein an incoming video signal is a video signal recording and / or reproducing device (that is, a video signal recording device, a video signal reproducing device, a video signal recording / reproducing device, Detection means for detecting that it is a video signal supplied from a recording / reproducing system of a VTR including a recording section 1 and a reproducing section 2 thereof of a new recording / reproducing apparatus which will be described later, and the detecting means records and / or records a video signal. When it is detected that the video signal is supplied from the reproducing apparatus, only the EDTV signal in which the auxiliary signal is band-banded is processed as the EDTV signal, and the detecting means records and records the video signal. And / or video signal processing means for performing video signal processing using the EDTV signal in which the auxiliary signal is modulated or encoded as the EDTV signal when it is detected that the video signal is supplied from other than the reproducing device. Video signal processing device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A video signal processing apparatus according to the present invention will be described below with reference to FIG.
~ It demonstrates along FIG. Figure 1 shows the new recording and playback device and ED
FIG. 2 is a diagram for explaining a connection state between TV receivers, and FIG.
FIG. 3 is a diagram for explaining the discrimination signal of the DTV signal and the signal position of the reference level, FIG. 3 is a diagram showing the configuration of an embodiment of an extraction circuit for extracting the discrimination signal and the reference level, and FIG. 4 is a PLL circuit constituting the extraction circuit. 6 is a diagram showing an example configuration of a recording unit in the new recording / reproducing apparatus, and FIG.
FIG. 7 is a diagram showing a configuration of an embodiment of a reproducing unit in the new recording / reproducing apparatus, FIG. 7 is a diagram for explaining a supply state of a baseband auxiliary signal identifying signal between the new recording / reproducing apparatus and an EDTV receiver, and FIG. 8 is a new recording. FIG. 9 is a signal waveform diagram for explaining the operation of identifying the baseband auxiliary signal between the reproducing device and the EDTV receiver, and FIG. 9 is a diagram for explaining the operation of the recording section in the new recording / reproducing device.

First, the video supply state between the new recording / reproducing apparatus and the EDTV receiver will be described. In FIG. 1, 1 is an EDTV
A recording section of the above-mentioned "new recording / reproducing apparatus" which is a video signal magnetic recording / reproducing apparatus for performing recording / reproducing processing corresponding to a signal, 2 is a reproducing section of the "new recording / reproducing apparatus", and 3 is an EDTV equipped with an auxiliary signal processing circuit. The above-mentioned EDT that performs the corresponding image reception processing
V receiver, 4 VHF, UHF, satellite broadcasting receiving antenna, 5 magnetic tape loaded inside the tape cassette,
Reference numerals 6 and 7 are connection cables for supplying video signals.

As the input video signal of the recording unit 1 of the "new recording / reproducing apparatus", the antenna video signal obtained by video detection of the reception signal from the antenna 4 by a tuner (not shown), the connection cable 6 and There is an external video signal supplied from an external video device (not shown) such as another "new recording / reproducing device" or the above-mentioned "conventional recording / reproducing device" via the connector A. In the recording unit 1, the magnetic tape 5 on which the video signal obtained by selecting the input video signal by an unillustrated video selection switch is recorded together with the audio signal is the reproducing unit of the "new recording / reproducing apparatus". 2 is reproduced, and the reproduced video signal and reproduced audio signal are supplied from the "new recording / reproducing apparatus" side to the EDTV receiver 3 via the connection cable 7 and the connector B, where they are received as a desired image and reproduced sound. It becomes an output. The above-mentioned connector B that supplies various information signals such as video / audio signals to the EDTV receiver 3 is often a multi-pin connector of, for example, 21 pins which is frequently used in Europe.

Here, problems caused by using the connector B will be described. If the device connected to the EDTV receiver 3 via the connection cable 7 and the connector B is a video tape recorder (hereinafter referred to as VTR), this VT
There are two kinds of cases where R is the above-mentioned "new recording / reproducing apparatus" and "conventional recording / reproducing apparatus", and when using it, the following (1) to (3) Can be considered.

(1) When the recording / reproducing of the EDTV signal is performed by the "new recording / reproducing apparatus" The reproduced signal output from the "new recording / reproducing apparatus" has a demodulated baseband auxiliary signal. This makes E
The DTV receiver 3 receives, as a full-size image, a composite video (a pattern image related to the pattern signal with improved image quality) obtained by combining the baseband auxiliary signal and the pattern signal.

(2) When the recording / reproducing of the EDTV signal is performed by the "conventional recording / reproducing apparatus" Since the recording / reproducing process corresponding to the EDTV signal like the "new recording / reproducing apparatus" is not performed, the "conventional recording / reproducing apparatus" is used. The output playback signal is a conventional TV signal with the auxiliary signal remaining modulated (or encoded). As a result, the EDTV receiver 3 receives the picture image related to the picture signal of the conventional TV signal as a full size image.

(3) When the EDTV signal is recorded by the "conventional recording / reproducing apparatus" and is reproduced by the "new recording / reproducing apparatus", the recording processing corresponding to the EDTV signal like the "new recording / reproducing apparatus" is performed. However, since the conventional TV signal having the auxiliary signal which is still modulated (or encoded) is reproduced by the "new recording / reproducing apparatus", such auxiliary signal in the reproduced signal is correctly demodulated (or encoded). Was)
I cannot guarantee that you can do it. As a result, the EDTV receiver 3 receives the picture image related to the picture signal of the conventional TV signal as a full size image.

In the cases (1) to (3) described above, the case where the external device connected to the EDTV receiver 3 via the connection cable 7 and the connector B is a VTR has been described, but a VTR such as a scramble decoder is described. It is also possible that a video device other than the above is connected to the EDTV receiver 3.

(4) When the EDTV signal is directly supplied: The EDTV receiver 3 is supplied from a scramble decoder or the like and the auxiliary signal is modulated (or encoded) E
The DTV signal is demodulated (or decoded). As a result, the EDTV receiver 3 receives, as a full-size image, a composite image (a pattern image related to the pattern signal with improved image quality) obtained by combining the baseband auxiliary signal and the pattern signal.

As in the cases (1) to (4) described above, the EDTV receiver 3 performs complicated image receiving processing according to the device connected to the EDTV receiver 3 via the connection cable 7 and the connector B. It must be made. Therefore, the following (A) ~
By using any of the methods of (C), it is possible to provide a video signal processing system without confusion in any of the above cases (1) to (4).

(A) Use of "VTR-dedicated connector" EDTV receiver 3 via the connection cable 7 and the connector B
When connecting the VTR to the VTR, a connector designated as a VTR dedicated connector is used instead of the connector B which is a general-purpose multi-pin connector. And this "VTR
The video signal coming from the "dedicated connector" into the EDTV receiver 3 is a composite video obtained by combining the baseband auxiliary signal and the picture signal only when it is identified as having the baseband auxiliary signal. EDT as (full size image) (a design image related to a design signal with improved image quality)
The V receiver 3 can receive an image. "VTR dedicated connector"
Even if it is a video signal coming from the EDTV receiver 3 to
When it is determined that the baseband auxiliary signal is not included, the EDTV receiver 3 receives only the picture signal as a full size image.

In this case, in order to avoid confusion between the "VTR-dedicated connector" and other general-purpose multi-pin connectors having the same structure, the "VTR-dedicated connector" is colored differently from the general-purpose multi-pin connector so as to be a general-purpose multi-pin connector. It should be possible to identify the user by the appearance, and alert the user.

(B) Use of "connector application changeover switch" In order to enable the above-mentioned connector B to be used also as "VTR-dedicated", "VTR-dedicated" and "devices other than VTR"
And a switch (not shown) for switching the purpose thereof is provided on the connector B or on the input side of the EDTV receiver 3. When this switch is switched to the "VTR-only" side, the video signal supplied to the EDTV receiver 3 via the connection cable 7 and then output to the EDTV receiver 3 has a baseband auxiliary signal. Only when it is identified, the EDTV receiver 3 uses the composite image (the picture image relating to the picture signal whose image quality has been improved in high quality) obtained by combining the base band auxiliary signal and the picture signal as a full size image. Can receive images. Even if a video signal coming into the EDTV receiver 3 from the "VTR dedicated connector" is identified as having no baseband auxiliary signal, the EDTV receiver 3 receives only the picture signal as a full-size image. To do.

(C) Detection of "VTR playback signal" VTR supplied to connector B via connection cable 7
Or from the characteristics of video signals from devices other than VTR, VT
The reproduction video signal from R is detected by a method described later, and the connector B is regarded as a “VTR dedicated connector”.

As described above, by detecting the "VTR reproduction signal", the above-mentioned (2) EDTV signal recording / reproduction is performed by the "conventional recording / reproducing apparatus", and the above-mentioned (3) EDTV signal recording / reproduction is performed. Recording is performed by the "conventional recording / reproducing device", and the reproduction is performed by the "new recording / reproducing device," and the processing is performed by demodulating (or decoding) the auxiliary signal that is not guaranteed to be correctly modulated (or decoded). As a result, the ED will deteriorate the image quality.
It is possible to prevent the TV receiver 3 from receiving an image.

Here, the following (first method) to (third method) are given as examples of the baseband auxiliary signal discrimination method added to the above-mentioned (A) method of using the "VTR dedicated connector". is there.

(First Method) In the connector B which is a multi-pin connector, an unused pin (for example, the tenth pin of the European CENELEC standard multi-pin connector) which is not currently used and is not used is newly added. It is for supplying the baseband auxiliary signal discrimination signal ". When the "baseband auxiliary signal discrimination signal" supply pin is at the "H" level, the video signal coming into the EDTV receiver 3 via the connector B is a reproduced video from the VTR having the baseband auxiliary signal. It is defined as a signal. In this case, the above-mentioned (1) EDTV signal recording / reproducing is performed by the "new recording / reproducing apparatus".
This is the case when you go to.

When the "baseband auxiliary signal discrimination signal" supply pin is at the "L" level, E is output via the connector B.
It is specified that the video signal coming into the DTV receiver 3 is a reproduced video signal from a VTR which does not include a baseband auxiliary signal. In this case, when (2) EDTV signal recording / reproducing is performed by the "conventional recording / reproducing apparatus", (3) EDTV signal recording is performed by the "conventional recording / reproducing apparatus" and the reproduction is performed by "new recording". This is the case when it is performed by the "reproduction device".

"Baseband auxiliary signal discrimination signal"
It is also possible to superimpose and add a "VTR special reproduction discrimination signal" described later to the baseband auxiliary signal discrimination signal applied to the supply pin. That is, in the above cases (1) to (3), the playback state of the VTR is “still (still image)”,
When the VTR special playback state such as "slow" or "search (high speed)", the "baseband auxiliary signal discrimination signal" supply pin is set to "H" level and the level of the "baseband auxiliary signal discrimination signal" is set to 1 / 2 (that is, 1/2 "H" level).

As a result, when the level of the "baseband auxiliary signal discrimination signal" supply pin is 1/2 "H" level, the video signal from the VTR coming into the EDTV receiver 3 via the connector B is It is possible to inform the EDTV receiver 3 side that the signal has the baseband auxiliary signal and is specially reproduced.

In this special reproduction, the signal waveform is different from that of the EDTV signal in the normal reproduction, and the discrimination signal bb in the EDTV signal cannot be extracted at a normal level. Therefore, a high image quality using the auxiliary signal is obtained. Signal processing for optimization cannot be performed. In addition to the baseband auxiliary signal discrimination, the discrimination signal bb is, for example, as shown in FIG. In the case of using the transmission method determination such that the image is transmitted by 360 lines and the margin image (or the auxiliary signal) at the bottom of the screen is transmitted by 120 lines, the EDTV receiver 3 side is used during this special reproduction. This determination signal bb may not be extracted.

Therefore, even if the discrimination signal bb cannot be extracted on the EDTV receiver 3 side, the level of the "baseband auxiliary signal discrimination signal" supply pin is 1/2 as described above.
When the EDTV receiver 3 identifies that it is at the “H” level, the EDTV receiver 3 stops the image receiving process for improving the image quality using the auxiliary signal, and also the pattern when the image was received before the special reproduction. By displaying the signal period, it is possible to solve the problem that the image quality during special reproduction deteriorates as compared with the image quality during normal reproduction.

Now, "baseband auxiliary signal discrimination signal"
The above-described method of superimposing and adding the "VTR special reproduction discrimination signal" to the baseband auxiliary signal discrimination signal applied to the supply pin effectively utilizes the empty connector pin. For example, when this empty pin is used for other purposes, it is necessary to set the “VTR special reproduction determination signal” to, for example, TTL logic in order to prevent the EDTV receiver 3 side from being damaged due to incorrect connection. As described above, in some cases, only the "H" level or the "L" level can be supplied. In this case, the EDTV receiver 3 receives this alternating signal by using an alternating signal (AC signal) that alternates between the "H" level and the "L" level at a predetermined cycle as the "VTR special reproduction signal". By passing it through a low-pass filter (not shown),
It can be set to 1/2 level of the "baseband auxiliary signal discrimination signal" similar to the "TR special reproduction signal". Therefore,
The "VTR special reproduction signal" can be supplied to the EDTV receiver 3 side.

Here, the cycle change of the alternating signal, which alternates between the "H" level and the "L" level at a predetermined cycle,
It should be an integer multiple of the line period, field period or frame period of the VTR playback video signal, and
By setting the changing points of the “H” level and the “L” level within the horizontal blanking period or the vertical blanking period of the reproduced video signal, the alternating signal becomes a video signal (that is, an auxiliary signal period and a pattern signal period). It is possible to prevent occurrence of image interference (degradation of image quality) in the EDTV receiver 3 due to jumping.

(Second Method) In the connector B, which is a multi-pin connector of the European CENELEC standard, it is another purpose to supply a DC signal for another pin (8th pin). When the AC signal of a level smaller than that described above is added to the signal of the above, and the alternating signal is not added, for example, the reproduced video signal of the VTR coming into the EDTV receiver 3 through the connector B is the base signal. It is stipulated that the band auxiliary signal is not provided, and when the alternating signal is added, the reproduced video signal of the VTR is provided with the base band auxiliary signal, and the form (cycle, duty ratio, etc.) of this alternating signal is Depending on the difference, it defines whether the video signal including the baseband auxiliary signal is in the normal reproduction state or the special reproduction state. For example, a rectangular wave whose level changes every line during normal reproduction of a video signal including a baseband auxiliary signal, and a rectangular wave which changes every two lines during special reproduction may be used.

As for the superposition and addition of the small-level alternating signal, the cycle of the alternating signal alternating between the "H" level and the "L" level in a predetermined cycle is the same as in the above (first method). Is set to an integer multiple of the line cycle, field cycle or frame cycle of the VTR playback video signal, and the change points of "H" level and "L" level are also within the horizontal blanking period or vertical blanking period. By doing so, it is possible to prevent the occurrence of image interference (deterioration of image quality) in the EDTV receiver 3 due to the alternating signal jumping into the video signal (that is, the auxiliary signal period and the pattern signal period).

The above-mentioned (first method), (second method)
In the VTR, it is identified that the video signal currently being reproduced in the VTR is a signal having a baseband auxiliary signal, and the information ("baseband auxiliary signal" is given to a predetermined pin (8th pin) of the multi-pin connector. It is necessary to superimpose a discrimination signal ").

An example of this method is Japanese Patent Application No. 3-360624 "Video signal transmission input and / or output device" previously proposed by the present applicant. This is V of the VHS system
In order to maintain compatibility with the so-called VISS / VASS system used for TR, the control signal "L" of 62.5% and 30% duty ratio used for preventing back track reproduction and the control signal of 57.5% and 25% duty ratio are used. A so-called "LL" which is an identification information word having a plurality of bits by utilizing the control signal "S" and combining them.
LS ". And, it is defined that when this" LLLS "is present, it is an EDTV signal having a baseband auxiliary signal.

Therefore, according to the duty ratio pattern of the servo control signal, "LLLS" information indicating that the baseband auxiliary signal has been recorded on the portion other than the video track (control track, for example) on the magnetic tape 5 during VTR recording. That is, the "TRLS" information reproduced together with the video signal may be detected on the VTR side at the time of reproduction. As another example of the alternating signal, the servo control signal itself may be a level-adjusted signal.

(Third method) As a method of identifying the baseband auxiliary signal, identification is performed by utilizing the characteristics of the baseband discrimination signal bb inserted in the video signal or the video signal in which the baseband auxiliary signal is inserted. There is a way to do it. An example will be described below.

Now, a discrimination signal b that the signal is an EDTV signal
b is one line within the vertical blanking period (for example, 625 lines / 50)
2nd line of the field broadcasting system)
As shown in (A), a certain period h at the rear of the one line
It is inserted leaving one. On the other hand, the auxiliary signals dd1 and d
When d2 is converted to a base band, a "reference level" that is a reference of the DC level of the base band auxiliary signal is required within the vertical blanking period.

Therefore, the reference level ee is used as the discrimination signal b.
By inserting during the remaining period h1 of b as shown in FIG. 7B, the discrimination signal bb can be inserted together with the reference level ee in the same line (23rd line). And
The discrimination signal bb and the reference level ee are both extracted from the video signal inserted in a specific line within the vertical blanking period, whereby the VTR side identifies the baseband auxiliary signal. In order to do so, only one line (for example, the 23rd line) within the vertical blanking period needs to be detected, which simplifies the extraction circuit (shown in FIG. 3 described later) for extracting the discrimination signal and the reference level. Can be obtained in configurations. Although not described in detail here, it goes without saying that the reference level ee may be inserted in a line different from that of the discrimination signal bb.

Here, the discrimination signal bb is not necessarily the EDTV.
It does not have to have a bit to indicate that it is a signal. For example, when the auxiliary signal is a VSB-modulated auxiliary signal, the auxiliary signal in the EDTV signal can be provided by providing only a bit indicating the horizontal letterbox method for displaying an image with an aspect ratio of 16: 9. The period corresponding to the auxiliary signal period when there is no signal is generally a constant black level, and since there is no signal component here, the modulation auxiliary signal demodulation process for demodulating the modulation auxiliary signal to obtain the baseband auxiliary signal is performed. Even if it is carried out, the demodulated output obtained corresponding to the period corresponding to this auxiliary signal period is the reference level ee. Therefore, the synthesized image obtained by synthesizing the reference level ee and the picture signal cc is It is substantially the same as the picture image with only the picture signal cc, and the image quality is not deteriorated by such a combining process.

Therefore, only the information of the horizontally long letterbox system for displaying an image with an aspect ratio of 16: 9 is sent, and when this is detected, the EDTV receiver 3 is sent.
May have a configuration for performing the above-described combining processing. Here, the information of the horizontally long letterbox system for displaying an image with an aspect ratio of 16: 9 and the like is also regarded as an auxiliary signal determination signal of the EDTV signal.

Since the above-mentioned reference level ee is necessary for the baseband auxiliary signal, when the auxiliary signal is converted into the baseband and recorded, this reference level ee is added to the video signal and recorded.

On the other hand, in the case of the video signal having the modulated auxiliary modulation signal, the DC level in the period corresponding to this reference level ee is the black level, and therefore the presence of the reference level ee in this period is detected. By doing so, it is possible to identify that the incoming video signal is one with a baseband auxiliary signal.

Therefore, when it is detected by the discrimination signal bb that the signal is an EDTV signal, and it is detected by this method that the signal has a baseband auxiliary signal, ED is detected.
The TV receiver 3 may identify the presence of the baseband auxiliary signal in the incoming video signal. It should be noted that this identification may be performed by the VTR reproduction system and used for controlling a predetermined pin of the multi-pin connector in the above (first method) and (second method). In this case, as compared with the case where the servo control signal is used, a circuit for extracting the discrimination signal bb is required in the reproducing system (especially in a device corresponding to the baseband auxiliary signal only during reproduction, the discrimination signal bb during recording is not extracted). Since it is unnecessary, it will be a completely new addition).

Here, the above (first method) to (third method)
(Third method), the (third method) is that the reproduction signal of the VTR is obtained from the characteristics of the input video signal supplied by utilizing the characteristics of the video signal having the discrimination signal bb and the baseband auxiliary signal. Since it is a method of detecting the signal, it is excellent in that it is not necessary to use pins other than the video signal pin of the multi-pin connector.

However, this (third method) is used when a dropout or the like occurs in the reproduction signal of the VTR or when the VTR is reproduced.
In the special reproduction of, the discrimination signal bb and the reference level ee are partially omitted or become a small level according to this, so that the detection of the discrimination signal bb and the reference level ee is extremely uncertain. (First method), (Second method)
Method) is better.

Therefore, first, the above (first method),
(Second method) is used to detect the ID supplied to a predetermined pin of the multi-pin connector (that is, "baseband auxiliary signal discrimination signal", "VTR special reproduction discrimination signal" detection)),
When the ID is detected, it is treated as an EDTV signal and I
When D is not detected, the reference level ee is detected by (third method), and when it is determined that the baseband auxiliary signal is included, it is treated as an EDTV signal,
Otherwise, it may not be treated as an EDTV signal.

Further, the (second method) is characterized in that the receiver 3 currently connected to the reproducing section 2 of the above-mentioned new recording / reproducing apparatus can be discriminated as described below. . That is, the input capacity of the EDTV receiver 3 connected to the eighth pin of the multi-pin connector of the CENELEC standard mentioned above is further increased. The CENELEC standard specifies that the input capacitance of pin 8 is 220 pF or less, so
A new capacitance (for example, about 0.03 μF to 0.1 μF; >>) 220 pF) is added to this.

Thus, the reproducing section 2 of the new recording / reproducing apparatus is supplied to the EDTV receiver 3 through the connecting cable 7 and the connecting connector B which is a multi-pin connector of the CENELEC standard.
In this connection state, as shown in FIG. 7, when the reproducing unit 2 of the new recording / reproducing apparatus reproduces the video signal having the baseband auxiliary signal, the rectangular baseband auxiliary signal identification signal (see FIG. 8).
(See (A)) ee is output. And this signal ee
Is supplied to the input side of the EDTV receiver 3 connected to the 8th pin of the connector B via the buffer 8 and the connecting cable 7, and is connected in series to the next stage of the capacitor C1 having the standard input capacitance of 220 pF. The transient characteristic is changed by the capacitance (additional capacitance) of the equalization impedance circuit 11 and becomes a signal (illustrated in FIG. 8B) ff in which the essence of rising and falling of the signal is greatly delayed. 12
Is a DC detection circuit for detecting the DC discrimination signal on the EDTV receiver 3 side, and 13 is an AC / DC detection circuit for detecting the alternation discrimination signal on the EDTV receiver 3 side. A signal gg obtained by waveform-shaping this signal ff by the buffer 9 (illustrated in FIG. 8C) is a signal delayed by a certain time compared with the original signal ee. The comparison circuit 10 compares the delay amount (phase difference) of the signal gg supplied from the EDTV receiver 3 side with respect to the signal ee output from the reproducing unit 2 side of the new recording / reproducing apparatus, and the signal gg is delayed with respect to the signal ee. By outputting a detection signal for detecting that the reproduction is performed to a receiver discriminating circuit (not shown), the reproducing unit 2 of the new recording / reproducing apparatus.
It is determined that the receiver connected to is an EDTV receiver.

When the receiver connected to the reproducing section 2 of the new recording / reproducing apparatus is a normal TV receiver which is not an EDTV compatible receiver, this TV receiver is equipped with the above-mentioned equalizing impedance circuit 11 provided in the EDTV receiver. Because it does not have
Even if the identification signal ee is supplied to the input side of the receiver connected to the eighth pin of the connector B via the buffer 8 and the connection cable 7, the signal on the output side of the buffer 8 changes in transient characteristics due to the addition of capacitance. Since the original signal ee is not received, the comparison circuit 10 does not output the above-mentioned detection signal to the receiver discriminating circuit (not shown), so that the receiver connected to the reproducing unit 2 of the new recording / reproducing apparatus normally operates. It can be determined that the TV receiver. In the above detection, the signal f
The duty ratio due to f also changes, but this does not affect the detection of the AC level.

Next, from the characteristics of the input video signal supplied to the connector B through the connection cable 7 as described above (third method), it is detected that it is a VTR reproduction signal, and the connector B is automatically detected. The automatic detection method for considering the connector as a "VTR dedicated connector" is described below.

Now, in general, a "discrimination signal bb" (illustrated in FIG. 2A) which is a digital data signal inserted in a specific line within a vertical blanking period in a video signal, or "discrimination signal bb, reference level" ee ”(illustrated in FIG. 2B) are extracted respectively, the discrimination signal detection circuit 2 having the configuration shown in FIG.
0 is performed (for example, a teletext decoder). In the figure, 21 is a video signal input terminal, 22 is a data sampling circuit, 23 is a data content identification circuit, 24 is a horizontal sync separation circuit, 25 is a vertical sync separation circuit, 26 is a PLL circuit, 27
Is a timing pulse generation circuit. The PLL circuit 26 includes a phase comparison circuit 28 and a VCO (voltage controlled variable oscillator) 2
9 and a counter circuit 30.

The video signal supplied from the video signal input terminal 21 is supplied to the horizontal sync separation circuit 24, the vertical sync separation circuit 25, and the data sampling circuit 22, respectively. The horizontal sync signal Hsync supplied from the horizontal sync separation circuit 24 via the terminal 24a and obtained by separating the video signal is PL.
It is output to the L circuit 26 and the timing pulse generating circuit 27, respectively.

The PLL circuit 26 outputs to the timing pulse generating circuit 27 and the data content identifying circuit 23 as a clock obtained by multiplying the horizontal synchronizing signal Hsync obtained by locking the frequency based on the supplied horizontal synchronizing signal Hsync. To do. The vertical sync separation circuit 25 outputs a signal corresponding to a vertical blanking period obtained by separating the supplied video signal to the timing pulse generation circuit 27. In the timing pulse generation circuit 27, as described above, the determination signal bb indicating that it is an EDTV signal is shown on a specific one line (for example, 625 lines / 50th field / 23rd line of the broadcasting system) within the vertical blanking period. So that a certain period h at the rear of the line
Since it is inserted with 1 left (shown in FIG. 2A) or with the reference level ee inserted in a certain period h1 (shown in FIG. 2B), the vertical blanking period and the horizontal synchronization are performed. By combining with the signal Hsync, the timing pulse generated here is supplied to the data sampling circuit 22 in accordance with a period corresponding to a specific one line in the vertical blanking period. The data extraction circuit 22 extracts the video signal in the period synchronized with the timing pulse supplied from the timing pulse generation circuit 27, and the data content identification circuit 2 of the next stage.
Supply to 3. The data content identification circuit 23 uses the "discrimination signal bb" from the video signal supplied from the data extraction circuit 22.
Alternatively, the "discrimination signal bb, the reference level ee" is discriminated.

Thus, it is detected from the following characteristics of the input video signal supplied from the video signal input terminal 21 that the video signal is a reproduced video signal of the VTR, and the connector B is automatically set to "VT".
It can be regarded as an “R dedicated connector”.

Here, the PLL circuit 26 shown by the broken line in FIG. 3 is locked according to the state of the input video signal supplied from the video signal input terminal 21 (two states of whether VTR reproduction or not). It may or may not lock.

Therefore, in order to determine whether or not VTR reproduction is performed by using this phenomenon, the configuration of the PLL circuit 26 is set as shown in FIG. That is, the PLL circuit 26 includes a first loop C in which the external constant of the voltage controlled variable oscillator is a crystal oscillator and a narrow lock range, and a second loop D in which the external constant is an LC circuit and a wide lock range. And a switch SW for switching between two loops.

The first loop C comprises a phase comparison circuit 30, a counter 31, a VXO (voltage controlled crystal oscillator) 32 having a crystal oscillator 32A, a double wave rectification circuit 33, a low pass filter 34, and a level detection circuit 35. . The second loop D is composed of a phase comparison circuit 36, a counter 37, and a VCO 38 having an LC time constant 38A. Switch S
The clock from the first loop C is supplied to the contact L side of W, the clock from the first loop C is supplied to the contact H side thereof, and this movable contact is supplied to the timing pulse generating circuit 27 described above. To be done. The switching of the movable contact of the switch SW is performed by the level detection signal from the level detection circuit 35 of the first loop C. When the level detection signal is at "H" level, the movable contact of the switch SW is switched to the contact H side (at this time, the VTR is determined to be in the reproduction state). When the level detection signal is at "L" level, the movable contact of the switch SW is switched to the contact L side (at this time, it is determined that the VTR is not in the reproducing state).

The phase comparison output of the phase comparison circuit 30 of the first loop C uses the oscillator output of the second loop D as a clock when a large AC component appears (that is, is not locked). Consider as "reproduction". First
When a large AC component does not appear (that is, is locked) in the phase comparison output of the loop (1), it is regarded as "not VTR reproduction", and the oscillator output of the first loop C may be used as a clock.

Here, the phase comparison circuit 3 of the first loop C
When the phase comparison output of 0 is a large AC component (that is, it is not locked), this AC component is detected by first removing the DC component of the phase comparison signal with a coupling capacitor (not shown) and then performing double-wave rectification. The circuit 33 performs double-wave rectification,
A method may be used in which an unnecessary high frequency component is removed by the low-pass filter 34, and the AC signal level is detected by the level detection circuit 35 by discriminating the level from the reference level.

The interface between the EDTV-compatible VTR (playback section 2 of the "new recording / playback apparatus") and the EDTV receiver 3 has been described above. Regarding the connector A) connected to the recording unit 1, when the output of another VTR is connected here (that is, when performing dubbing), whether the auxiliary signal is demodulated (or decoded) at the time of recording is determined. Whether or not it is the recording unit 1 of the "new recording / reproducing device" on the slave side
This is also required for the connector B, and therefore, for the connector B as well, it is necessary for the connector A to perform any one of the contents respectively described in the above (first method) to (third method).

The configuration of one embodiment of VTR recording / reproducing will be described below. First, the recording unit 1 of the "new recording / reproducing apparatus"
FIG. 5 shows the configuration of one embodiment. The recording section 1 of the above-mentioned "new recording / reproducing apparatus" shown in FIG. 1 is composed of the following parts. That is, a set of a brightness signal and a color signal (so-called Y / C separation) input brightness signal input terminal 41, a color signal input terminal 42 to which the color signal is supplied, and a composite video signal are supplied. A composite video signal input terminal 43, a modulation auxiliary signal demodulation circuit 44 that demodulates the modulation auxiliary signal in the luminance signal and outputs a baseband auxiliary signal,
The reference level adding circuit 45 for adding the reference level ee to the baseband auxiliary signal as described above, the luminance signal comb filter circuit 46 for extracting the luminance signal from the composite video signal, and the color signal separating circuit 47 for extracting the color signal from the composite video signal. , A luminance signal recording processing circuit 48 having the same configuration as the known VTR luminance signal recording system, and a color signal recording processing circuit 49 having the same configuration as the known VTR color signal recording system 49, F
Outputs an input signal of a frequency multiplexing circuit 50 for frequency-multiplexing an M-modulated luminance signal and a low-frequency conversion color signal, a recording amplifier 51, a pair of (recording-only or recording / reproducing) video heads 52, and a luminance signal recording processing circuit 48. Output terminal 53,
An output terminal 54 for outputting an input signal of the color signal recording processing circuit 49, an input terminal 55 to which the above-mentioned ID signal is supplied from a pin of the multi-pin connector to which a baseband auxiliary signal identification signal is transmitted, and an antenna 4. An identification signal detection circuit 5 for identifying an ID signal supplied from an input switching signal input terminal 56 and an input terminal 55 to which an input switching signal for determining whether it is an antenna input or an external input from the connector A is supplied.
7, input switching signal input terminal 56, identification signal detection circuit 5
7. Discrimination signal detection circuit 59 An EDTV mode determination circuit 58 that determines the mode of the EDTV signal based on the output signals from each, a discrimination signal detection circuit 59 that detects the determination signal of the output signal of the switch SW3, and an EDTV mode determination circuit 58. A baseband auxiliary signal identification signal generating circuit 60 for outputting a baseband auxiliary signal identification signal based on a command signal from
Baseband auxiliary signal identification signal output terminals 61, E for outputting the baseband auxiliary signal identification signal to a predetermined pin for transmitting the baseband auxiliary signal identification signal in the multi-pin connector
A switching pulse generation circuit 62 that generates a switching pulse based on a command signal from the DTV mode determination circuit 58, a servo control pulse generation circuit 63 that generates a known servo control pulse based on a command signal from the EDTV mode determination circuit 58, Servo control pulse recording amplifier 64, control head 65, switch SW1 having three contacts A, B and C, and SW having two contacts A and B respectively
2, SW3, SW4, SW5.

Here, the switches SW3, SW4 and SW5
Is a switch which is switched depending on whether the input video signal is the Y / C separated input coming from the above-mentioned input terminals 41 and 42 or the composite video signal coming from the input terminal 43. Servo control pulse generating circuit 6 for switching and recording each signal output from the switches SW1 and SW2
The change of the duty ratio of the servo control pulse output from No. 3 is based on whether the external device (not shown) connected to the above-mentioned input terminals 41 to 43 is another VTR (first method). To (third method), the EDTV mode determination circuit 58 determines based on the determination signal bb in the video signal (luminance signal) and the ID signal of the connector A which is a multi-pin connector, Figure 9
It can be switched as shown in.

In FIG. 9, "not EDTV" is EDTV.
Normal TV signal that is not a signal, "not LLLS" is "
It means a control signal having no identification signal of "LLLS", respectively.

The switching pulse generating circuit 62 in FIG. 5 uses the vertical / horizontal synchronizing signal Vsync.V as a timing pulse representing the auxiliary signal period and the picture signal period (shown in FIG. 11). It is generated by using Hsync respectively, and is switched at the timing shown in FIG. The output of the switch SW1 is subjected to known luminance signal recording processing in the luminance signal recording processing circuit 48, and the output of the switch SW2 is subjected to known color signal recording processing in the color signal recording processing circuit 49 to perform FM modulation. The luminance signal and the low-frequency converted color signal are frequency-multiplexed by the frequency multiplexing circuit 50, and then recorded in a helical shape on the magnetic tape 5 by the video head 52 via the recording amplifier 51. Further, as shown in FIG. 9, the servo control pulse output from the servo control pulse generating circuit 63 is subjected to a duty change according to each case, and a magnetic tape is passed through the servo control pulse recording amplifier 64 and the control head 65. A control track is formed on the recording medium 5 and recorded.

Next, FIG. 6 shows the construction of an embodiment of the reproducing section 2 of the "new recording / reproducing apparatus". The reproducing section 2 of the above-mentioned "new recording / reproducing apparatus" shown in FIG. 1 is composed of the following parts. That is, the set of the video head 52 (only for reproduction or for both recording and reproduction), the control head 65, the reproduction preamplifier 66, the high-pass filter 67, and the well-known VTR luminance signal reproduction system have the same configuration and have the above-mentioned luminance signal recording processing circuit 48.
A luminance signal reproduction processing circuit 68 having a configuration complementary to the luminance signal output terminal 6 for outputting the output signal of the switch SW6.
9, low-pass filter 70, the same configuration as the well-known VTR color signal reproduction system and the color signal recording processing circuit 49 described above.
A color signal reproduction processing circuit 71 having a configuration complementary to
A color signal output terminal 72 for outputting an output signal of the switch SW7, a video output control circuit 73 for switching and controlling each movable contact of the switches SW6 and SW7, a servo control pulse reproduction amplifier 74, and a duty ratio of reproduced servo control pulses are detected. Based on the "LLLS" sequence detection circuit 75, the "LLLS" sequence detection signal and the special reproduction mode pulse supplied from the outside, a superimposed wave is output to a predetermined pin output for transmitting the baseband auxiliary signal identification signal in the multi-pin connector ( For example, a superimposed wave generating circuit 76 for generating and outputting an alternating signal, a superimposing circuit 77 for superimposing this superimposed wave on a predetermined pin output for transmitting a baseband auxiliary signal identification signal in the multi-pin connector, a base band in the multi-pin connector Predetermined pin (CE
Superimposing circuit 7 on the NELEC standard multi-pin connector 8th pin)
An output terminal 78 for supplying an output signal from the switch 7, a switch S
It is composed of W6 and SW7.

This is an example using the (second method) of the identification of the above-mentioned baseband supplementary symbols, and the control head 6
5. A change in the duty of the reproduction control pulse obtained via the servo control pulse reproduction amplifier 74 is detected, and when the change coincides with "LLLS", a predetermined pin of the connector B (for example, a multi-pin connector) (for example, AC component (for example, horizontal scanning period (H
A rectangular wave of a period) is generated, and during normal reproduction, this is added to the DC level of the logic of the eighth pin and output to a predetermined pin of the connector B.

At the time of special reproduction, an AC component (for example, a square wave having a period twice the H period) indicating special reproduction is added to the DC level and output to a predetermined pin of the connector B.

The video signal processing performed by the above-mentioned high-pass filter 67, low-pass filter 70, luminance signal reproduction processing circuit 68, and color signal reproduction processing circuit 71 is performed by a luminance signal reproduction system and a color signal reproduction system in a known VTR. This is similar to the video signal processing performed. The switches SW6 and SW7, which are the preceding stages of the luminance signal output terminal 69 and the color signal output terminal 72,
When connecting to a conventional TV receiver with an aspect ratio of 4: 3, the baseband auxiliary signal converted into a baseband becomes conspicuous as an interference on the screen.
6 and 7 are for replacing the auxiliary signal with a DC signal of a constant level in the auxiliary signal period. Here, instead of the signal of a constant level, color may be added, the graphic image may be replaced, or information such as the date may be displayed. Further, whether or not to perform the above switching by the switches SW6 and SW7 may be selected by a manual switch (not shown), or may be selected by the automatic detection of the connection partner.

[0076]

As described above, the video signal processing apparatus according to the present invention is capable of processing various types of video signals including an EDTV signal in which a picture signal representing image information and an auxiliary signal related to the picture signal are time-division multiplexed. A video signal processing device for determining a type and performing a video signal processing according to the determined type of a video signal, wherein an incoming video signal is a video signal supplied from a video signal recording and / or reproducing device. And a detecting means for detecting that the auxiliary signal is an EDTV signal in which the auxiliary signal is band-banded, when the detecting means detects the image signal supplied from the image signal recording and / or reproducing apparatus.
When the video signal is processed as a TV signal and the detecting means detects that the video signal is supplied from a device other than the video signal recording and / or reproducing device, the EDTV signal in which the auxiliary signal is modulated or encoded is used as the EDTV signal. Since it is provided with a video signal processing means for performing signal processing, for example, when it is regulated that a modulation auxiliary signal is converted into a base band in recording of an EDTV signal and recorded by a VTR compatible with EDTV, EDTV is used in a recording case involving a conventional VTR. There is an effect that it is possible to provide a video signal processing device that can prevent the image quality from being deteriorated by returning as a result of processing and can always record and reproduce a video signal of various signal forms including an EDTV signal with good image quality. .

[Brief description of drawings]

FIG. 1 is a diagram for explaining a connection state between a new recording / reproducing device and an EDTV receiver.

FIG. 2 is a diagram for explaining a discrimination signal of an EDTV signal and a signal position of a reference level.

FIG. 3 is a diagram showing a configuration of an embodiment of an extraction circuit for extracting a discrimination signal and a reference level.

FIG. 4 is a diagram showing a configuration of an embodiment of a PLL circuit that constitutes an extraction circuit.

FIG. 5 is a diagram showing a configuration of an embodiment of a recording unit in the new recording / reproducing apparatus.

FIG. 6 is a diagram showing a configuration of an embodiment of a reproducing section in the new recording / reproducing apparatus.

FIG. 7 is a diagram illustrating a supply state of a baseband auxiliary signal identification signal between a new recording / reproducing device and an EDTV receiver.

FIG. 8 is a signal waveform diagram illustrating an operation of identifying a baseband auxiliary signal between a new recording / reproducing device and an EDTV receiver.

FIG. 9 is a diagram illustrating an operation of a recording unit in the new recording / reproducing apparatus.

FIG. 10 is a diagram for explaining a letterbox type image.

FIG. 11 is a diagram for explaining an EDTV signal.

[Explanation of symbols]

 1 Recording unit of new recording / reproducing device 2 Reproducing unit of new recording / reproducing device 3 EDTV receiver 4 Antenna 5 Magnetic tape 6,7 Connection cable A, B connector

Claims (1)

[Claims] 1. A type of a plurality of types of video signals including an EDTV signal in which a picture signal representing image information and an auxiliary signal related to the picture signal are time-division multiplexed is discriminated, and the discriminated video signal is classified into A video signal processing device for performing video signal processing according to the above, wherein the detecting means detects that the incoming video signal is a video signal supplied from a video signal recording and / or reproducing device, and the detection means is a video signal. When the video signal supplied from the signal recording and / or reproducing device is detected, only the EDTV signal in which the auxiliary signal is band-banded is processed as the EDTV signal, and the detecting means records and / or records the video signal. When it is detected that the video signal is supplied from other than the playback device, the video signal processing is performed using the EDTV signal in which the auxiliary signal is modulated or encoded as the EDTV signal. A video signal processing apparatus characterized by comprising a Cormorant video signal processing means.