JPH06268967A - Video signal recording and/or reproducing device - Google Patents

Abstract

PURPOSE:To prevent deterioration in the picture quality due to invasion of noises by replacing a predetermined DC level in place of a signal portion of an auxiliary signal from a switching point till a vertical blanking period. CONSTITUTION:A video signal recorder 1 records a pattern signal representing picture information, auxiliary signals dd1, dd2 relating to the pattern signal, and an EDTV signal as in which a DC reference level and the discrimination signal are subject to time division multiplex. A timing generating circuit 7 outputs position signals ii, jj corresponding to a specific position of the auxiliary signal dd2 (a signal portion of auxiliary signal dd2 estimated for head switching at reproduction). Then switches SW1, SW2 outputs a recording EDTV signal hh obtained by replacing the auxiliary signal portion dd2 with a predetermined DC level signal V for a period from a specific position till a vertical blanking period in response to the production of the position signals ii, jj. Then the recorded EDTV signal hh is outputted to a next stage luminance signal recording processing circuit 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording and / or reproducing apparatus (that is, a video signal recording apparatus, a video signal reproducing apparatus, and a video signal recording / reproducing apparatus).

[0002]

2. Description of the Related Art FIG. 5 is a diagram for explaining an image of a letter box system, and FIG. 6 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 landscape image having an aspect ratio of 16: 9, which is compatible with a conventional TV receiver having an aspect ratio of 4: 3, has been studied. As one of the methods, when displaying on a conventional television receiver, black portions are formed in the upper and lower portions of the screen as shown in FIG. 5, and a horizontally long (16: 9 aspect ratio) image is formed in the central portion. There is a letterbox system that displays the image, and this black part is used to obtain a high quality image when displayed on an EDTV receiver compatible with EDTV signals capable of reproducing a 16: 9 aspect ratio image in full size. It has been proposed to insert vertical and horizontal high-frequency components as auxiliary signals dd1 and dd2 in a period corresponding to. cc is a picture signal representing image information.

The auxiliary signals dd1 and dd2 may be so-called VSB-modulated signals in which the carrier is suppressed or digitally modulated (or encoded) signals. Hereinafter, this signal will be referred to as an EDTV signal,
It is illustrated in FIG. Incidentally, in order to make it possible to determine whether or not the signal is an EDTV signal, a 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 "PALplus" which is being studied in Europe.

However, when the above-mentioned EDTV signal is recorded / reproduced by a conventional video signal magnetic recording / reproducing apparatus such as a VTR, it does not correspond to the recording / reproducing of the EDTV signal. Since the video signal is recorded and reproduced in a format compatible with the device, the EDT has the following problems (1) to (3).
The above-mentioned auxiliary signals dd1 and dd2 of the V signal are signals that cannot be decoded by the decoder for obtaining a high quality image.

(1) Since the auxiliary signals dd1 and dd2 are not necessarily signals having line correlation, line correlation is performed by a comb filter using a predetermined line correlation for separating a luminance signal and a chrominance signal related to the EDTV signal. Auxiliary signal d without
Since a part of d1 and dd2 is removed, the auxiliary signals dd1 and dd2 are deteriorated at the output of the comb filter.

(2) When the auxiliary signals dd1 and dd2 are VSB modulated signals, the carrier that follows the jitter contained in the video signal reproduced from the conventional video signal magnetic recording / reproducing apparatus is reproduced during reproduction. Therefore, a good reproduction signal cannot be obtained because the VSB modulation signal cannot be well reproduced without complicated time base correction. In addition, since a VSB modulated signal generally requires a wide band transmission system capable of transmitting up to the vicinity of a carrier in a high frequency band, there is a drawback that a wide band video signal magnetic recording / reproducing apparatus cannot satisfactorily record / reproduce this signal.

(3) When the auxiliary signals dd1 and dd2 are digital signals that are digitally modulated (encoded), an error correction code addition circuit and an error correction circuit are required for recording and reproduction, and further for decoding. It is also necessary to regenerate the clock signal, and there is a drawback that the device 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.

[0011]

On the other hand, in a helical scan type video tape recorder (hereinafter referred to as a VTR), EDTV signals are alternately recorded by a plurality of heads for each field and the helical shape is recorded on a magnetic tape. The signal tracks are sequentially formed on the head, and at the time of reproduction, the respective signal tracks are sequentially and alternately reproduced by the plurality of heads.

Further, the head switching point during reproduction (hereinafter referred to as a switching point) is in the auxiliary signal dd2 as shown in FIG. 6, and more specifically, the vertical synchronizing signal Vsync starting from the 3rd H in the vertical blanking period. For example, 5H before to 8H before (H represents a line period) is set. As a result, there is a problem that noise due to switching points is mixed in the auxiliary signal dd2.

Then, when the EDTV receiver having the video / audio input terminal connected to the video / audio output terminal of the VTR is used, E when receiving the reproduced EDTV signal
In the signal processing in the DTV receiver, since the auxiliary signal dd1 and dd2 1 line corresponding to the upper and lower portions of the screen shown in FIG. 5 are combined with the picture signal cc3 line, noise due to the switching point mixed in the auxiliary signal dd2 is generated. Since it is mixed in one line of the auxiliary screen signal, this switching point moves to a higher position on the screen as compared with the conventional position of the switching point on the screen. For example, the switching point is the vertical synchronization signal Vsy.
If it is 8 H before nc, it will be about 8% from the bottom in the vertical direction on the screen with an aspect ratio of 16: 9, so there is a problem that dot-like noise due to switching points is more noticeable on the screen than before. It was

Since the continuity of the auxiliary signal dd2 at the rear is impaired by the presence of the switching point, the auxiliary signal dd2 after the switching point is the pattern signal cc.
A combination processing circuit (memory) for performing the above combination processing with
There is a problem that the writing timing at the time of writing is shifted from the pattern signal, and as a result of performing the synthesizing process with the pattern signal by using the time-shifted auxiliary signal, the image quality is returned and deteriorated.

[0015]

In order to solve the above problems, the present invention provides a video signal recording and / or reproducing apparatus having the following configuration.

A video signal recording device for recording an EDTV signal in which a picture signal representing image information and an auxiliary signal related to this picture signal are time-division multiplexed, and a position signal corresponding to a specific position of the auxiliary signal is recorded. A position signal output circuit for outputting and a recorded EDTV signal obtained by replacing the auxiliary signal portion with a predetermined level signal for a period from the specific position to a vertical blanking period in response to the generation of the position signal. A video signal recording apparatus comprising a video signal recording processing circuit including a recording switching circuit.

Of the EDTV signal in which a picture signal representing image information, an auxiliary signal related to this picture signal, and a reference level signal related to this auxiliary signal are time-division multiplexed, the signal portion of the auxiliary signal is the reference level signal. And a holding circuit for outputting a holding level signal obtained by holding the reference level signal, and a period from a switching point to a vertical blanking period. A video signal reproduction processing circuit having a reproduction switching circuit for switching and outputting the auxiliary signal to the holding level signal.

A video signal recording processing circuit for recording a recorded EDTV signal in which a picture signal representing image information, an auxiliary signal related to this picture signal, and a reference level signal related to this auxiliary signal are time-division-multiplexed is the auxiliary signal. A position signal output circuit that outputs a position signal according to a specific position of the signal, and, in response to the generation of the position signal, replaces the auxiliary signal portion with a predetermined level signal during a period from the specific position to a vertical blanking period. And a recording switching circuit for outputting a recorded EDTV signal obtained by replacing the signal portion of the auxiliary signal of the EDTV signal with the reference level signal. The processing circuit includes a holding circuit that outputs the holding level signal obtained by holding the reference level signal, and the auxiliary signal during the period from the switching point to the vertical blanking period. Video signal recording and reproducing apparatus, wherein a and a playback switching circuit for switching output to the holding level signal.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A video signal recording and / or reproducing apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram showing an embodiment of a main part of a video signal recording system which is a main part of the device of the present invention, FIG. 2 is a time chart for explaining a recording operation of the video signal recording system, and FIG. 3 is a device of the present invention. FIG. 4 is a time chart for explaining the reproducing operation of the video signal reproducing system, which is an embodiment of the main part of the video signal reproducing system, which is the main part of FIG.

The video signal recording and / or reproducing apparatus according to the present invention generally has a video signal recording system and / or a video signal recording system, as will be described later.
Alternatively, in the video signal reproducing system (in particular, the luminance signal recording system and / or the luminance signal reproducing system), a constant portion is used instead of the signal portion of the auxiliary signal dd2 in the period ee from the position where the switching point e exists to the vertical blanking period. The EDTV signal obtained by eliminating the noise generated in the auxiliary signal dd2 due to the influence of the switching point e by the configuration for replacing the DC level is recorded and reproduced, and the switching point e
The image quality is prevented from being deteriorated due to the noise mixing.

Now, the video signal recording apparatus 1 according to the present invention.
As shown in FIGS. 1 and 2, respectively, is a picture signal cc representing image information and auxiliary signals dd1 and d2 related to the picture signal cc.
A device for recording an EDTV signal aa in which d2, a DC reference level, and a discrimination signal bb are time-division multiplexed, and a specific position of the auxiliary signal dd2 (an auxiliary signal dd2 which is assumed to be subjected to head switching at the time of reproduction). Timing signal generating circuit (position signal output circuit) 7 for outputting a position signal ii, jj corresponding to the signal position), and a period from the specific position to the vertical blanking period in response to the generation of the position signal ii, jj. ee, a luminance signal processing circuit (video signal recording processing circuit) including switches (recording switching circuits) SW1 and SW2 for outputting a recording EDTV signal hh obtained by replacing the auxiliary signal portion dd2 with a predetermined DC level signal V Have 4.

In FIG. 1, the luminance signal processing circuit 4 is composed of a demodulation circuit 5, a sync signal separation circuit 6, a timing generation circuit 7, switches SW1 and SW2, and a DC power supply Vcc. 2 is a luminance signal input terminal, 3 is a color signal input terminal, 8 is a luminance signal recording processing circuit, 9 is a color signal recording processing circuit, 10 is a frequency multiplexing circuit, 11 is a recording amplifier, 1
Reference numeral 2 is a magnetic head, and 13 is a magnetic tape.

The above-mentioned luminance signal processing circuit 4 is a luminance signal obtained by frequency-separating a composite video signal from a color signal with a band pass filter (not shown), or a set of a color signal and a luminance signal (so-called Y / C signal). ) Of the EDTV signal a through the luminance signal input terminal 2 to which the luminance signal of
a is supplied. Here, since the EDTV signal aa is composed of a horizontal / vertical synchronizing signal and a luminance signal component including a grayscale picture signal, this is processed by the luminance signal processing circuit 4.

As described above, the luminance signal processing circuit 4 has a position signal ii, which corresponds to a specific position of the auxiliary signal dd2 (a signal portion of the auxiliary signal dd2 in which head switching is assumed to be performed during reproduction). The timing generation circuit 7 for outputting jj and the period e from the specific position to the vertical blanking period in response to the generation of the position signals ii, jj.
e, a switch S for outputting the recorded EDTV signal hh obtained by replacing the auxiliary signal portion dd2 with a predetermined DC level signal V
W1 and SW2 are provided, and the recorded EDTV signal hh output from the luminance signal processing circuit 4 is output to the luminance signal recording processing circuit 8 in the next stage.

The luminance signal recording processing circuit 8 is a known luminance signal recording processing circuit composed of a pre-emphasis circuit, a clamp / clip circuit, a frequency modulation circuit, a high-pass filter circuit, etc., and is output from the luminance signal processing circuit 4 described above. The frequency-multiplexing circuit 1 outputs the FM-modulated EDTV signal obtained by subjecting the recorded EDTV signal hh to known luminance signal recording processing.
Output to 0.

The color signal related to the above-mentioned EDTV signal aa supplied to the color signal input terminal 3 is directly supplied to the color signal recording processing circuit 9, where ACC is set.
(Auto color control) processing, frequency conversion processing,
The low-frequency conversion color signal obtained by the well-known color signal recording processing such as the unnecessary high-frequency component removal processing is output to the frequency multiplexing circuit 10 described above.

The frequency multiplexing circuit 10 timing-matches the FM-modulated EDTV signal from the luminance signal recording processing circuit 8 and the low frequency conversion color signal from the color signal recording processing circuit 9, and then frequency-multiplexes both signals. The recorded video signal thus obtained is output to the recording amplifier 11. Recording amplifier 11
Supplies the recorded video signal supplied from the frequency multiplexing circuit 10 to a required level, and then supplies it to a pair of magnetic heads 12 for recording only or for recording / reproducing. The magnetic heads 12 and 12 sequentially and alternately record the recorded video signal on the magnetic tape 13 for each field. Thus, signal tracks are sequentially formed on the magnetic tape 13 in a helical shape.

When the auxiliary signal of the EDTV signal aa supplied through the luminance signal input terminal 2 is modulated (or encoded), the demodulation circuit 5 constituting the luminance signal processing circuit 4 described above modulates it. Baseband auxiliary signals dd1 and dd2 (illustrated in FIG. 2A) obtained by demodulating the auxiliary signal are output (the demodulation circuit 5 does not output signals other than the baseband auxiliary signals dd1 and dd2). Further, the sync signal separation circuit 6 separates and outputs the horizontal sync signal and the vertical sync signal of the EDTV signal aa to the timing creation circuit 7.

This timing generation circuit 7 outputs the signal ff
A logical product of (shown in FIG. 2B) and a pulse that is at the “H” level in a period other than the horizontal blanking period of the EDTV signal aa is output to the switch SW1 as the first switching control signal ii. Further, the timing generation circuit 7 uses the signal gg (see FIG.
A logical product of (shown in (C)) and a pulse of the EDTV signal aa which is at the “H” level in a period other than the horizontal blanking period is output to the switch SW2 as the second switching control signal jj.

The switch SW1 is connected to the contact A to which the direct current level V from the DC power source Vcc is constantly supplied, the output side of the demodulation circuit 5 described above, and the baseband auxiliary signal dd1.
It has a terminal B to which dd2 is supplied and a movable contact connected to the contact A of the switch SW2. Contact A of switch SW1
The DC level V supplied to the demodulation circuit 5 is equal to the output level appearing on the output side of the demodulation circuit 5 when the input level of the modulation auxiliary signal supplied to the demodulation circuit 5 is zero.

When the switch SW1 receives the first switching control signal ii from the timing generation circuit 7, its movable contact is switched to the contact A side.
During the switching period of, the DC level V is supplied to the switch SW2. This first switching period corresponds to the period ee from the rising of the “H” level of the signal ff to the vertical blanking period.

Further, the switch SW1 switches its movable contact from the contact A side to the contact B side when the first switching control signal ii is not supplied, and the output from the demodulation circuit 5 is output during the second switching period. The contact B is supplied to the contact A of the switch SW2 through the movable contact, and all of the baseband auxiliary signal dd1 and most of the baseband auxiliary signal dd2 except for the signal portion of the first switching period described above are supplied to the switch S.
It is supplied to W2. This second switching period corresponds to one field period of the EDTV signal excluding the above-mentioned period ee (corresponding to the "L" level period of the signal ff).

The switch SW2 has a contact A connected to the movable contact of the switch SW1, a terminal B to which the EDTV signal aa supplied through the above-mentioned brightness signal input terminal 2 is applied, and a brightness signal recording in the next stage. And a movable contact connected to the input side of the processing circuit 8.

When the second switching control signal jj is supplied from the timing generation circuit 7, the movable contact of the switch SW2 is switched to the contact A side.
Of the baseband auxiliary signal dd1 and the new baseband auxiliary signal dd3 (that is, during the generation period of the baseband auxiliary signal dd2, the first switching period is the DC level V, and the baseband auxiliary signal is in other periods. Signal d
The auxiliary signal of d2) is supplied to the contact A of the switch SW2 (the third switching period is substantially the baseband auxiliary signals dd1 and dd2 corresponding to the "H" level period of the detection signal gg).
(Auxiliary signal period corresponding to (dd3)).

When the second switching control signal jj is not supplied, the switch SW2 has its movable contact switched from the contact A side to the contact B side, and through the luminance signal input terminal 2 during the fourth switching period. EDTV signal aa supplied by
Is a contact B, and the vertical synchronizing signal Vsync, the DC reference level, the discrimination signal bb, and the picture signal cc in the vertical blanking period are sequentially supplied to the input side of the luminance signal recording processing circuit 8 via the movable contact (the first). The switching period of 4 is substantially the detection signal gg
Corresponding to the "L" level period of the).

Here, the above-mentioned switch SW1 is connected to the output side of the demodulation circuit 5, but this switch SW1
Is connected to the input side of the demodulation circuit 5 (the contact A is supplied with a DC level signal corresponding to the black level of the video signal, the contact B is connected to the luminance signal input terminal 2 and the movable contact is connected to the demodulation circuit 5). And connect the output side of the demodulation circuit 5 to the contact A of the switch SW2.
Even if the connection is made again, the same effect as described above can be obtained.

Furthermore, the rising timing of the above-mentioned detection signal ff (illustrated in FIG. 2B) from the timing generation circuit 7 is slightly longer than the beginning of the timing at which head switching at the time of reproduction described later is assumed to be performed. It is set to the previous timing and to include the switching point at the time of reproduction. For example, a rotary drum switching pulse (Fig. 4) that causes a switching point during reproduction.
(Illustrated in (B)) When the rising timing position of the 11 switching pulse is determined to be 5H to 8H before the vertical synchronizing signal Vsync, the rising timing of this detection signal ff is 8H before the vertical synchronizing signal Vsync. Is set for the horizontal retrace line period.

Now, the video signal reproducing apparatus 21 according to the present invention.
As shown in FIGS. 3 and 4, respectively, a picture signal cc representing image information and auxiliary signals dd1 and d2 related to the picture signal cc.
Of the EDTVaa signal in which d2 and the reference level signal (DC reference level) related to the auxiliary signals dd1 and dd2 are time-division multiplexed, the signal portion of the auxiliary signal dd2 related to the switching point is obtained by switching to this reference level signal. Which is a device for reproducing the reproduced and recorded EDTV signal pp, and which outputs a holding level signal oo obtained by holding the reference level signal 28.
And a luminance signal processing circuit (video signal reproduction processing circuit) 26 including a switch (reproduction switching circuit) SW3 for switching and outputting the auxiliary signal dd2 during the period ee from the switching point e to the vertical blanking period to the holding level signal oo. Have.

In FIG. 3, reference numeral 22 is a reproducing magnetic head, 23 is a reproducing preamplifier, 24 is a luminance signal reproducing processing circuit, 25 is a color signal reproducing processing circuit, 26 is a color signal output terminal, and the above-mentioned luminance signal processing circuit 27 is provided. Is composed of a sample hold circuit 28, a timing pulse generating circuit 29, an AND circuit 30, and a switch SW3. 31 is a reproduction reference level signal input terminal, 32 is a horizontal synchronization signal input terminal, 3
3 is a vertical synchronizing signal input terminal, 34 is a drum switching pulse input terminal, 35 is an EDTV signal recording detection pulse input terminal,
Reference numeral 36 is a luminance signal output terminal. 13 is a magnetic tape.

The reproduction magnetic head 22 described above outputs a reproduction signal corresponding to the reproduction EDTV signal hh by sequentially and alternately performing helical scanning of signal tracks formed in a helical shape on the magnetic tape 13. The reproduction signal thus obtained is supplied to the reproduction preamplifier 23, where it is amplified to a required level and then supplied to the luminance signal reproduction processing circuit 24 and the color signal reproduction processing circuit 25, respectively.

The luminance signal reproduction processing circuit 24 is a well-known luminance signal reproduction processing system composed of a high-pass filter circuit, an equalizer amplifier circuit, a limiter circuit, a frequency demodulation circuit, a de-emphasis circuit, and the like. 8 and a circuit operation complementary thereto are performed. That is,
After the unnecessary low frequency component removal processing, the equalization processing, the limiter processing, the frequency demodulation processing, and the de-emphasis processing of the reproduction signal supplied from the reproduction preamplifier 23 are sequentially performed, the recording EDT is performed.
The V signal hh is output to the luminance signal processing circuit 27.

The luminance signal processing circuit 27 at the next stage supplies the reproduced EDTV signal hh supplied from the luminance signal reproduction processing circuit 24 to the sample hold circuit 28 and the switch SW3, respectively. The sample hold circuit 28 reproduces the reproduction reference level signal kk supplied from the reproduction reference level signal input terminal 31.
In synchronization with (shown in FIG. 4D), the DC reference level (FIG. 4) in the reproduced EDTV signal hh supplied here.
The holding level signal oo obtained by sampling and holding (shown in (A)) for one field period is applied to the contact A of the switch SW3.
Supply to. The contact B of the switch SW3 is supplied with the reproduced EDTV signal hh supplied from the luminance signal reproduction processing circuit 24.

The switch SW3 is a luminance signal reproduction processing circuit 2
The reproduced EDTV signal hh supplied from No. 4 and the holding level signal oo from the sample hold circuit 28 are switched and selected as follows to output the reproduced EDTV signal pp to the luminance signal output terminal 36. That is, the switch SW3 is movable when the switching control signal from the AND circuit 30 is at the "H" level (that is, the period ee from the switching point e in the auxiliary signal dd2 of the reproduction EDTV signal hh to the vertical blanking period). The contact is switched to the contact A, and during this period, the reproduced EDTV signal hh is used instead of the auxiliary signal dd2.
The DC reference level of is output to the luminance signal output terminal 36. Further, the switch SW3 has its movable contact at the contact B when the switching control signal mm (illustrated in FIG. 4C) from the AND circuit 30 is at the “L” level (a period other than the period ee described above). Switched, play E during this period
The discrimination signal bb of the DTV signal hh, the DC reference level, the auxiliary signal dd1, and the picture signal cc are sequentially output to the luminance signal output terminal 36.

The color signal reproduction processing circuit 25 described above is a well-known color signal reproduction system composed of a low-pass filter circuit, an ACC circuit, a frequency conversion circuit, a dropout compensation circuit, and the like. Complementary configurations and circuit operations are performed. That is, after the unnecessary high frequency component removal processing, ACC processing, frequency inverse conversion processing, and dropout compensation processing of the reproduction signal supplied from the reproduction preamplifier 23 are sequentially performed, the reproduction signal is output from the color signal output terminal 26 as a reproduction color signal. .

The timing pulse generating circuit 29 which constitutes the above-mentioned luminance signal processing circuit 27 is reproduced through the horizontal / vertical synchronizing signal input terminals 32 and 33.
A horizontal / vertical sync signal, which is sync-separated by a sync separation circuit (not shown), is supplied from the DTV signal hh, and a control track on the magnetic tape 13 is controlled by a control head (not shown) via the drum switching pulse input terminal 34. A rotary drum switching pulse 11 (shown in FIG. 4 (B)) having a switching point is supplied based on a reproduction control signal obtained by scanning and reproducing the control signal recorded in (1).

Then, the timing pulse generation circuit 29
Is a horizontal / vertical synchronizing signal and a rotary drum switching pulse ll
And a detection signal which is obtained by ANDing
Output to one of the input terminals.

At the other input terminal of the AND circuit 30, E
EDT indicating that the reproduced EDTV signal hh is an EDTV signal via the DTV signal recording detection pulse input terminal 35.
A V signal detection signal is supplied. And EDT not shown
When the V signal discrimination circuit discriminates that the signal is an EDTV signal, the EDTV signal detection signal becomes "H" level.
Here, the EDTV signal discrimination information can be easily obtained by varying the duty ratio of the recording control signal at the time of recording and comparing and discriminating it with the reproduction control signal having a normal duty ratio. .

Here, the DC reference level of the reproduced EDTV signal hh mentioned above is a reference level when synthesizing the baseband auxiliary signals dd1 and dd2 and the picture signal cc, which is, for example, a vertical return. The place to be inserted within the line period shall be determined, and it shall be inserted and recorded at the time of recording. As a result, it becomes possible to record / reproduce the composite video signal obtained by combining the new auxiliary signals dd1 and dd3, which have the time lag due to the influence of the discontinuity of the time axis in the switching point period e, with the picture signal cc. Since the picture signal cc is not affected by the discontinuity of the time axis in head switching, deterioration of image quality can be prevented.

Further, the above description separately describes the video signal recording apparatus 1 shown in FIG. 1 and the video signal reproducing apparatus 21 shown in FIG. 3, but the video signal recording / reproducing according to the present invention is described. It goes without saying that the apparatus may be configured by using the above-mentioned video signal recording device 1 in its video signal recording system and by using the above-mentioned video signal reproducing device 21 in its video signal reproducing system. Is.

[0051]

As described above, the video signal recording apparatus of the present invention is a video signal recording apparatus for recording an EDTV signal in which a picture signal representing image information and an auxiliary signal related to the picture signal are time division multiplexed. And a position signal output circuit that outputs a position signal according to a specific position of the auxiliary signal, and, in response to the generation of this position signal, the auxiliary signal portion is predetermined for a period from the specific position to a vertical blanking period. EDT because it has a video signal recording processing circuit including a recording switching circuit for outputting a recorded EDTV signal obtained by replacing
There is an effect that it is possible to provide a video signal recording device capable of always recording video signals of various signal forms including V signals with good image quality.

Further, the video signal reproducing apparatus of the present invention, among the EDTV signals in which the picture signal representing the image information, the auxiliary signal related to this picture signal and the reference level signal related to this auxiliary signal are time-division multiplexed, A video signal reproducing device for outputting a reproduced EDTV signal obtained by replacing the signal portion of the auxiliary signal with the reference level signal, comprising: a holding circuit for holding the reference level signal and outputting the obtained holding level signal. ,
Since it has a video signal reproduction processing circuit including a reproduction switching circuit for switching and outputting the auxiliary signal for the period from the switching point to the vertical blanking period to the holding level signal,
There is an effect that it is possible to provide a video signal reproducing device that can always reproduce video signals of various signal forms including EDTV signals with good image quality.

Furthermore, the video signal recording / reproducing apparatus of the present invention provides a recorded EDTV signal in which a picture signal representing image information, an auxiliary signal related to this picture signal, and a reference level signal related to this auxiliary signal are time-division multiplexed. The video signal recording processing circuit for recording processing includes a position signal output circuit that outputs a position signal corresponding to a specific position of the auxiliary signal, and a period from the specific position to a vertical blanking period in response to the generation of the position signal. A recording switching circuit for outputting a recorded EDTV signal obtained by replacing the auxiliary signal portion with a predetermined level signal,
A video signal reproduction processing circuit for reproducing the reproduced EDTV signal obtained by replacing the signal portion of the auxiliary signal in the EDTV signal with the reference level signal is a holding level signal obtained by holding the reference level signal. And a reproduction switching circuit for switching and outputting the auxiliary signal during the period from the switching point to the vertical blanking period to the holding level signal. Therefore, video signals of various signal types including EDTV signals can be generated. There is an effect that it is possible to provide a video signal recording / reproducing apparatus capable of always recording with a good image quality, and capable of always reproducing a video signal of various signal forms including the EDTV signal thus recorded with a good image quality.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a main part of a video signal recording system which is a main part of a device of the present invention.

FIG. 2 is a time chart for explaining a recording operation of a video signal recording system.

FIG. 3 is a diagram showing an embodiment of a main part of a video signal reproducing system which is a main part of the device of the present invention.

FIG. 4 is a time chart for explaining a reproducing operation of a video signal reproducing system.

FIG. 5 is a diagram for explaining a letterbox type image.

FIG. 6 is a diagram for explaining an EDTV signal.

[Explanation of symbols]

 1 Video Signal Recording Device 4 Luminance Signal Processing Circuit (Video Signal Recording Processing Circuit) 7 Timing Creation Circuit (Detection Circuit) 21 Video Signal Reproducing Device 26 Luminance Signal Processing Circuit (Video Signal Reproducing Processing Circuit) 28 Sample Hold Circuit (Holding Circuit) aa EDTV signal cc picture signal dd1, dd2 auxiliary signal e switching point hh reproduction EDTV signal ii, jj detection signal kk reproduction reference level signal oo holding level signal SW1, SW2, SW3 switch V level signal

Claims (3)

[Claims] 1. A video signal recording device for recording an EDTV signal in which a picture signal representing image information and an auxiliary signal relating to the picture signal are time-division multiplexed, and a position corresponding to a specific position of the auxiliary signal. A position signal output circuit for outputting a signal, and a recorded EDTV signal obtained by replacing the auxiliary signal portion with a predetermined level signal during a period from the specific position to a vertical blanking period in response to the generation of the position signal. A video signal recording apparatus comprising a video signal recording processing circuit having a recording switching circuit for outputting. 2. An EDTV signal in which a picture signal representing image information, an auxiliary signal related to this picture signal, and a reference level signal related to this auxiliary signal are time-division multiplexed, and the signal portion of the auxiliary signal is the reference. A video signal reproducing device for outputting a reproduced EDTV signal obtained by replacing with a level signal, comprising: a holding circuit for outputting a holding level signal obtained by holding the reference level signal; and a vertical retrace period from a switching point. A video signal reproduction apparatus having a video signal reproduction processing circuit having a reproduction switching circuit for switching and outputting the auxiliary signal for the period up to the holding level signal. 3. A video signal recording processing circuit for recording a recorded EDTV signal in which a picture signal representing image information, an auxiliary signal related to this picture signal and a reference level signal related to this auxiliary signal are time-division multiplexed. A position signal output circuit that outputs a position signal according to a specific position of the auxiliary signal, and, in response to the generation of the position signal, outputs a position signal from the specific position to a vertical blanking period to a predetermined level signal of the auxiliary signal portion. And a recording switching circuit that outputs a recorded EDTV signal obtained by replacing the signal portion of the auxiliary signal of the EDTV signal with the reference level signal. The signal reproduction processing circuit includes a holding circuit that outputs the holding level signal obtained by holding the reference level signal, and the supplementary circuit during the period from the switching point to the vertical blanking period. Video signal recording and reproducing apparatus characterized by comprising a playback switching circuit for switching output signals to the holding level signal.