JPH0720262B2 - Video signal recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording / reproducing apparatus, and more particularly to a video signal recording / reproducing apparatus for recording / reproducing without setting a composite color video signal.

2. Description of the Related Art FIG. 3 shows a block system diagram of an example of a conventional video signal recording / reproducing apparatus. First, the operation during recording will be described. The composite color video signal input from the input terminal 1 is supplied to the Y / C separation circuit 2 and separated into a luminance signal Y and a carrier color signal C, respectively. The separated luminance signal is passed through an emphasis circuit 3, an FM modulator 4, and a high-pass filter (hereinafter referred to as HPF) 5 to be a frequency-modulated luminance signal (FM luminance signal) and supplied to an adder 6.

On the other hand, the separated carrier color signal is supplied to the ACC circuit 8 through the switch circuit 7 connected to the terminal R side at the time of recording, the level is adjusted, and then the balanced modulator 9. The horizontal sync signal obtained by sequentially passing the separated luminance signal through the switch circuit 10 and the sync separation circuit 11 connected to the terminal R at the time of recording is used as a phase comparator 12, an adder 13, and a voltage controlled oscillator ( VCO) 14 and counter 15 are supplied to a phase-locked loop (PLL), where the frequency is set to a predetermined frequency, and then the PS processing circuit 16 sets 90 for each horizontal scanning period.
A known phase shift process (Phase Sh
ift processing) is performed and the balanced modulator 17 is supplied. Since the switch 24 is opened during recording, the adder 13 does not perform addition operation during recording.

The balanced modulator 17 uses the color subcarrier frequency of the reference system color video signal from the oscillator 18 (thus 3.5795 for the NTSC system).
45MHz, in the case of the APL method, for example, a signal of frequency f _S equal to 4.433679MHz) and, for example, a frequency of 40f _H from the PS processing circuit 16.
In the above, the signal is subjected to balanced modulation with the signal subjected to the phase shift processing described above, and the output signal is supplied to the balanced modulator 9 through the bandpass filter (hereinafter referred to as BPF) 19 as a signal having a frequency of (f _S + 40f _H ). To do. As a result, the low-pass conversion carrier color signal having the color subcarrier frequency of 40 f _H and having undergone the above-mentioned phase shift processing is taken out from the balanced modulator 9 through the low-pass filter (hereinafter referred to as LPF) 20. This low-frequency converted carrier color signal is frequency-division-multiplexed with the FM luminance signal by the adder 6, and then supplied to the head 22 through the recording amplifier 21 and recorded on the magnetic tape 23.

Next, the operation during reproduction will be described. The recorded frequency division multiplexed signal of the magnetic tape 23 is reproduced by the head 25 and supplied to the LPF 27 and HPF 28 through the reproduction amplifier 26, respectively.
The reproduced FM luminance signal separated by the HPF 28 is supplied to the adder 31 through the de-emphasis circuit 30 after being converted into the reproduced luminance signal by the FM demodulator 29, and is also supplied to the synchronous separation circuit 11 through the switch circuit 10. It During reproduction, the switch circuits 7 and 10 are switched and connected to the terminal P side, respectively, and the switch 24 is closed. Therefore, the output phase error voltage of the phase comparator 32 corresponding to the phase difference between the output signal of the oscillator 18 and the output reproduction color burst signal of the burst sampling circuit 35 described later is supplied to the adder 13 in the PLL through the switch 24. To be done. From this PLL, a signal that is phase-synchronized with the reproduction horizontal synchronization signal having jitter from the synchronization separation circuit 11 and that responds to the phase shift of the reproduction color burst signal is taken out, and sent to the balanced modulator 17 through the PS processing circuit 16. It is provided and is then balanced-modulated with the output signal of the oscillator 18. The output signal of the balanced modulator 17 is supplied to the balanced modulator 9 through the BPF 19 as a conversion signal having a frequency (f _S + 40f _H ) according to the jitter or a frequency very close to this, where the LPF 27, the switch circuit 7 and the ACC circuit. The signal is subjected to balanced modulation (frequency conversion) with the reproduced low-frequency conversion carrier color signal having jitter, which is sequentially passed through 8.

As a result, the reproduced carrier chrominance signal that has been returned to the original phase in the original band is extracted from the balanced modulator 9 through the BPF 33, and further, through the comb filter 34 for canceling crosstalk from the adjacent track. While being supplied to the burst sampling circuit 35, it is supplied to an adder 31 where it is multiplexed with a reproduction luminance signal to form a reproduction composite color video signal and output to an output terminal 36.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional video signal recording / reproducing apparatus having the above-mentioned configuration, Y / C
As the separation circuit 2, the circuit having the configuration shown in FIG. 4 (A) or (B) was used. The Y / C separation circuit shown in FIG. 4 (A) is a circuit that separates the luminance signal from the input composite color video signal by the LPF 40 and separates and outputs the carrier color signal by the BPF 41, but it is the same as the carrier color signal. The high frequency component of the luminance signal that occupies the band cannot be separated and output, and the low frequency component of the carrier color signal is LPF40 at the color boundary.
May remain in the output luminance signal of and output a little,
The image quality was degraded.

On the other hand, the Y / C separation circuit shown in FIG.
The composite video signal from the carrier color signal is separated and waved through the comb filter composed of the 1H delay line 43 and the subtractor 44, and this is output to the output terminal 48 through the BPF 45.
The input composite color video signal is subtracted by the subtractor 47 through the level adjuster 46 to separate the luminance signal and output to the output terminal 49.

However, this Y / C separation circuit uses a comb filter consisting of a 1H delay line 43 and a subtractor 44 to generate f _H / 2 (however,
Since f _H is designed to extract only frequency components in odd multiples of the horizontal scanning frequency) and its vicinity, in the case of a composite color video signal having vertical correlation to the image, it occupies the same band as the carrier color signal. Although the high frequency component of the luminance signal can be generated,
There is a problem in that the Y / C separation cannot be performed accurately for a composite color video signal related to a pattern having a low vertical correlation, and the image quality deteriorates.

Further, since the reproduced composite color video signal output from the output terminal 36 is a so-called composite signal in which the luminance signal and the carrier color signal are each multiplexed, the reproduced composite color video signal is displayed on the display device as a monitor. , Other VT
When performing dubbing recording with R, it is necessary to perform Y / C separation again in these devices, so the above-mentioned problems occur.

As described above, since the composite color video signal input to the input terminal 1 and the reproduced composite color video signal output from the output terminal 36 are both composite signals in the past, even if a comb filter is used, It is said that dot interference to the luminance signal and cross color interference to the color signal due to the luminance signal are unavoidable, and the image quality deteriorates. Especially, the deterioration of the image quality is noticeable in large-screen monitor television receivers, which have become popular recently. There was a problem.

Therefore, an object of the present invention is to provide a video signal recording / reproducing apparatus which solves the above problems by recording / reproducing a luminance signal and a carrier color signal without multiplexing them.

Means for Solving the Problems The video signal recording / reproducing apparatus according to claim 1,
A first input terminal dedicated to a luminance signal, a second input terminal dedicated to a carrier color signal, and a third input terminal dedicated to a composite video signal;
A first output terminal dedicated to a reproduction luminance signal, a second output terminal dedicated to a reproduction carrier color signal, and a third output terminal dedicated to a reproduction composite video signal, and a luminance signal input to the first input terminal; Means for generating a frequency-modulated luminance signal from a luminance signal separated from the composite video signal input to the third input terminal, and a carrier color signal input to the second input terminal or an input to the third input terminal Means for generating a low-frequency conversion carrier color signal occupying a band lower than the frequency-modulated luminance signal band from the carrier color signal separated from the composite video signal, and the frequency-modulated luminance signal and the low-frequency conversion carrier color signal Means for frequency-division-multiplexing and recording the frequency-division-multiplexed signal on a recording medium, and for reproducing the frequency-division-multiplexed signal from the recording medium, from which the frequency-modulated luminance signal and the low-frequency conversion carrier color signal are separated and filtered. Means to do Demodulation means for demodulating the separated frequency-modulated luminance signal to obtain a reproduction luminance signal, frequency conversion means for returning the separated low-frequency conversion carrier color signal to the reproduction carrier color signal in the original band, and reproduction luminance signal And a reproduction carrier color signal are output from the first and second output terminals, respectively, and a reproduction composite video signal obtained by adding the reproduction luminance signal and the reproduction carrier color signal is output from the third output terminal. Consists of means.

The video signal recording / reproducing apparatus according to claim 2 has a first input terminal dedicated to a luminance signal, a second input terminal dedicated to a carrier color signal, and a third input terminal dedicated to a composite video signal. , A composite video input to the third input terminal, comprising a first output terminal dedicated to the reproduction luminance signal, a second output terminal dedicated to the reproduction carrier color signal, and a third output terminal dedicated to the reproduction composite video signal A Y / C separation means for separating the signal into a luminance signal and a carrier color signal, and a first for selectively outputting the luminance signal input to the first input terminal and the luminance signal output from the Y / C separation means. The selection means, the carrier color signal and the Y /
Second selection means for selectively outputting the carrier color signal output from the C separation means, means for generating a frequency-modulated luminance signal from the luminance signal passed through the first selection means, and first selection means Sync separation means for separating the synchronization signal from the luminance signal, and a low-frequency conversion carrier color signal that occupies a band lower than the band of the frequency-modulated luminance signal from the carrier color signal that has passed through the second selecting means based on the synchronization signal. Means for frequency-division-multiplexing the frequency-modulated luminance signal and the low-frequency conversion carrier color signal, means for recording the frequency-division multiplexed signal on a recording medium, and reproducing the frequency-division multiplexed signal from the recording medium, From this, means for separating and filtering the frequency-modulated luminance signal and the low-frequency conversion carrier color signal respectively, demodulation means for demodulating the separated frequency-modulated luminance signal to obtain a reproduction luminance signal, and separated low-frequency conversion Transport color And a reproduction luminance signal and a reproduction carrier color signal respectively from the first and second output terminals, and a reproduction luminance signal and a reproduction carrier color signal. And output means for outputting the reproduced composite video signal obtained by adding and from the third output terminal.

The video signal recording / reproducing apparatus according to claim 3 has a first input terminal dedicated to a luminance signal, a second input terminal dedicated to a carrier color signal, and a third input terminal dedicated to a composite video signal. , A composite video input to the third input terminal, comprising a first output terminal dedicated to the reproduction luminance signal, a second output terminal dedicated to the reproduction carrier color signal, and a third output terminal dedicated to the reproduction composite video signal A Y / C separation means for separating the signal into a luminance signal and a carrier color signal, and a first for selectively outputting the luminance signal input to the first input terminal and the luminance signal output from the Y / C separation means. The selection means, the carrier color signal and the Y /
Second selection means for selectively outputting the carrier color signal output from the C separation means, means for generating a frequency-modulated luminance signal from the luminance signal passed through the first selection means, and first selection means A third for selectively outputting the luminance signal and the reproduction luminance signal
The selection means, the separation means for separating the synchronization signal from the signal that has passed through the third selection means, and the second based on the synchronization signal.
Means for generating a low-frequency conversion carrier chrominance signal that occupies a band lower than the frequency-modulated luminance signal band from the carrier chrominance signal that has passed through the selection means, and frequency-modulated luminance signal and low-frequency conversion carrier chrominance signal Means for performing division multiplexing, recording the frequency division multiplexed signal on a recording medium, and means for reproducing the frequency division multiplexed signal from the recording medium, and separating and filtering the frequency-modulated luminance signal and the low-frequency conversion carrier color signal from this And demodulation means for demodulating the separated frequency-modulated luminance signal to obtain a reproduction luminance signal, and based on the synchronization signal, the separated low-frequency conversion carrier color signal is returned to the reproduction carrier color signal in the original band. The frequency conversion means, the reproduction luminance signal and the reproduction carrier color signal
The output means outputs the reproduction composite video signal obtained by adding the reproduction luminance signal and the reproduction carrier color signal from the second output terminal, and outputs the reproduction composite video signal from the third output terminal.

The luminance signal and the carrier chrominance signal, which have been separately input to the one set of input terminals, are generated into the frequency-modulated luminance signal and the low frequency conversion carrier chrominance signal, and then frequency division multiplexed by the recording means. Is recorded on the recording medium. Therefore, in the recording system, the input signal is recorded after being converted into the frequency division multiplexed signal without passing through the Y / C separation circuit.

On the other hand, in the reproducing system, the reproduced frequency-modulated luminance signal of the reproduced frequency-modulated luminance signal and the reproduced low-frequency-converted carrier color signal reproduced after being reproduced from the recording medium is demodulated by the demodulating means and reproduced. Become a signal. Further, the reproduced low frequency conversion carrier color signal is returned to the reproduced carrier color signal of the original band by the frequency conversion means. These reproduction luminance signal and reproduction carrier color signal are respectively supplied to the output means,
The signals are separately output from the first and second output terminals.

Therefore, even in the reproduction system, the reproduction signal is output in the form of the component signal without outputting the component signal such as the multiplexed signal (composite signal) of the luminance signal and the carrier color signal or the color difference signal.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block system diagram of an embodiment of the present invention. In the figure, the same components as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 1, the first set of input terminals
51-1, 51-2 and 51-3 have a luminance signal Y and a color difference signal (R
-Y) and (B-Y) come in separately. Further, the red signal R, the green signal G, the blue signal B and the synchronizing signal are separately input to the second set of input terminals 52-1, 52-2, 52-3 and 52-4. Further, the luminance signal Y and the carrier color signal C are input to the third set of input terminals 53-1 and 53-2 in the state of being separated separately. That is, 53-1 is an input terminal dedicated to the luminance signal, and 53-2 is an input terminal dedicated to the carrier color signal.

The matrix circuit 54 uses the three primary color signals input from the input terminals 52-1 to 52-3 and the synchronization signal input from the input terminal 52-4 to determine the luminance signal Y and two types of color difference signals (RY) and ( BY) are generated respectively. The switch circuit 55-1 selectively outputs one of the brightness signal from the matrix circuit 54 and the brightness signal from the input terminal 51-1 to the switch circuit 56. Also,
The switch circuit 55-2 is a color difference signal (RY) from the matrix circuit 54 and a color difference signal (RY) from the input terminal 51-2.
One of them is supplied to the balanced modulator 58. Switch circuit 55-3
Selects and outputs either the color difference signal (BY) from the matrix circuit 54 or the color difference signal (BY) from the input terminal 51-3 to the balanced modulator 59.

On the other hand, the color subcarrier frequency extracted from the oscillator 18
A signal having a frequency equal to f _S is phase-adjusted by the phase adjuster 62, converted into two types of signals having a predetermined phase and frequencies f _S different in phase by 90 °, and then the balanced modulators 58 and 59. Are separately supplied as carrier waves. As a result, the carrier frequency f _S is supplied from the balanced modulators 58 and 59 to the color difference signal (R−
The balanced modulated waves obtained by the balanced modulation in Y) and (B-Y) are taken out and supplied to the adder 60. As a result, the carrier color signal obtained by subjecting the carrier frequency f _S to the quadrature two-phase modulation with the color difference signals (RY) and (BY) is taken out from the adder 60 as the output signal of the encoder 61, and the switch circuit. Supplied to 57.

The switch circuit 57 selects one of the carrier color signals generated by the encoder 61 and the carrier color signals from the Y / C separation circuit 2 and the carrier color signal dedicated input terminal 53-2. When outputting, it outputs to the balanced modulator 9 through the switch circuit 7 and the ACC circuit 8 during recording. Further, the switch circuit 56 includes the Y / C separation circuit 2 and the luminance signal dedicated input terminal 53-1.
And one of the three luminance signals from the switch circuit 55-1 is selectively output to the emphasis circuit 3. Normally, the switch circuits 56 and 57 are switched together, and the switch circuits 55-1 to 55-3 are also switched together.

The low-frequency conversion carrier color signal obtained by the balance modulation by the balance modulator 9 and the FM luminance signal extracted from the HPF 5 are frequency-division multiplexed by the adder 6 as in the conventional case, and then the head.
It is recorded on the magnetic tape 23 by 22.

As a result, for example, by inputting the output signals of the VTR that outputs the reproduction luminance signal and the reproduction carrier color signal to the input terminals 53-1 and 53-2, respectively, without making the composite signal during reproduction, Magnetic tape as a frequency division multiplexed signal of a predetermined standard
Dubbing recording can be performed on the image recording medium 23, and in this case, dubbing recording can be performed with good image quality without deterioration of image quality due to the Y / C separation.

Also, to the input terminals 51-1 to 51-3, or 52-1 to 52-4,
By supplying a predetermined signal from a television camera, a telecine, or the like, it is possible to convert the signal to the predetermined frequency division multiplexed signal and record it on the magnetic tape 23 without converting it to a composite signal even once. Good image quality can be recorded without image quality deterioration due to Y / C separation. Furthermore, the frequency division multiplexed signal recorded by this recording system is compatible with the existing low frequency conversion color recording / reproducing system.
Compatible playback can also be done with VTR.

Next, the operation at the time of reproduction will be described. The reproduced carrier color signal which has been subjected to the same signal processing as that of the conventional apparatus and taken out from the comb filter 34 is supplied to the RY demodulation circuit 63 and the BY demodulation circuit 64, respectively. Supplied.

On the other hand, as described above, the oscillator 18 oscillates and outputs the signal for generating the frequency conversion signal in order to restore the reproduction low frequency conversion carrier color signal to the reproduction carrier color signal of the original band. The signal frequency is a frequency equal to the color subcarrier frequency f _S.

Therefore, in the present embodiment, the output signal of the oscillator 18 is branched and supplied to the phase adjuster 62, where the RY axis and BY
The phase adjustment necessary for demodulation on the axis is performed, and the two output signals from the phase adjuster 62 having a phase difference of 90 ° are separately supplied to the RY demodulation circuit 63 and the BY demodulation circuit 64. To be supplied as a demodulation reference carrier.

As a result, the demodulated baseband color difference signal RY is extracted from the RY demodulation circuit 63, and the BY demodulation circuit is obtained.
Similarly, the baseband color difference signal B-
Y is taken out. These color difference signals (RY) and (BY) are supplied to the matrix circuit 65, respectively, while being output to the output terminals 67-1 and 67-3.

The matrix circuit 65 is supplied with the above-mentioned two kinds of color difference signals and the reproduction luminance signal from the de-emphasis circuit 30, respectively, and performs well-known matrix processing from these signals to obtain a red signal (R), a green signal (G) and a blue signal. (B) The three primary color signals are generated and separately output to the output terminals 68-1, 68-2 and 68-3, and the composite synchronizing signal (SYNC) is output to the output terminal 68-4.

Some recent television receivers are provided with video input terminals for three primary color signals, and ones are provided with video input terminals for color difference signals and luminance signals. It is possible to display a high-quality color image by supplying the above. That is,
Since the reproduced video signal is a component signal form in which the three primary color signals or the luminance signal and the two types of color difference signals are transmitted separately and simultaneously without combining, the conventional combination of the luminance signal and the carrier color signal There is no mutual interference due to.

Also, the reproduction luminance signal extracted from the de-emphasis circuit 30 is output terminals 66-1 and 67-1 dedicated to the reproduction luminance signal.
Is output to. The reproduction carrier color signal from the comb filter 34 is also output to the output terminal 66-2 dedicated to the reproduction carrier color signal. The reproduction luminance signal and the reproduction carrier color signal taken out in parallel from the output terminals 66-1 and 66-2 are, for example, different VTRs.
Is output for dubbing recording.

Input signals from the input terminals 67-1 to 67-3 and the input terminals
Dubbing recording may be performed using the input signals of 68-1 to 68-4, and since dubbing recording of good image quality is possible because it is not converted into a composite signal even once, input terminal 53-1 dedicated to the luminance signal, transport By providing the color signal dedicated input terminal 53-2, there is no possibility of color change due to an error of the encoder 61, the matrix circuit 54, and the matrix circuit 65, and dubbing recording more faithful with respect to color reproducibility can be performed.

By the way, in the above embodiment, the carrier color signal of the standard color television system is generated by the encoder 61 from the three primary color signals or the two kinds of color difference signals, but the signal to be recorded is the low frequency conversion carrier color signal. Therefore, the low-frequency conversion carrier color signal may be directly generated. This is realized by the second embodiment of the present invention shown in FIG. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In Fig. 2, during recording
From the PS processing circuit 16, the phase shifts in a fixed direction by 90 ° for each horizontal scanning period at the same frequency as the color subcarrier frequency of the low-frequency conversion carrier color signal (for example, 40 · f _H ), and the phase shift A signal whose direction is inverted every field is extracted.

Therefore, in this embodiment, the output signal of the PS processing circuit 16 is
It is fed to the phase adjuster 69, where
The phase is adjusted so that two types of signals with different 90 ° phases are obtained. The frequency 40, which is extracted from the phase adjuster 69
At f _H , the two types of signals that are 90 ° out of phase with each other at the same time are supplied to the balanced modulators 58 and 59 as carrier waves, respectively. As a result, the color difference signal (RY) from the adder 60
And (B−Y), the low-frequency conversion carrier color signal obtained by quadrature-phase modulating the carrier wave 40 · f _H is taken out, the unnecessary high frequency component is removed by the LPF 70, and then supplied to the adder 6.

The circuit for directly generating the low-frequency conversion carrier color signal from the two kinds of color difference signals is not limited to the above-mentioned embodiment, and for example, the present inventor has proposed it in Japanese Patent Application No. 60-33330. A processing circuit can also be applied. Processing circuit according to this proposal, two to four different 40 · f 2 kinds of color difference signals by a total of two selected outputs every horizontal scanning period low-frequency carrier wave _H is the 90 ° out of phase with each other are supplied These are supplied to the balanced modulators, respectively.

Further, the present invention is not limited to the VTR of the above-described embodiment, but can be applied to other video signal recording / reproducing apparatus using a recordable / reproducible optical disk or a magnetic disk as a recording medium.

Further, the PS process may be a known PI (Phase Invent) process, and in the case of a recording / reproducing system other than the azimuth recording / reproducing system, this process is unnecessary.

EFFECTS OF THE INVENTION As described above, according to the present invention, a composite signal in which a luminance signal and a carrier color signal are band-shared and multiplexed based on an input signal (luminance signal, carrier color signal, primary color signal, color difference signal, etc.). Since a predetermined frequency division multiplex signal is generated and recorded without being separated even once, it is possible to completely eliminate the signal deterioration due to Y / C separation, thus recording or dubbing a signal with good image quality. Can also,
Since it has an input terminal dedicated to the luminance signal and an input terminal dedicated to the carrier color signal, an encoder and a matrix circuit for generating the luminance signal and the carrier color signal from the three primary color signals and color difference signals are not required, and the current VTR can be simply improved. , It is possible to configure at extremely low cost, and there is no possibility of color change due to errors in the matrix circuit. It is possible to perform more faithful recording in terms of color reproducibility. The entire band of the luminance signal including the high frequency component of the luminance signal can be effectively used, and the image quality can be further improved. Also, since the reproduction luminance signal and the reproduction carrier color signal are output separately without Y / C separation,
Despite the simple structure, it does not require a configuration to generate a component signal such as a color difference signal, a line-sequential color difference signal, or a three-primary-color signal from a reproduction luminance signal and a reproduction carrier color signal. It is suitable for dubbing because it can output a signal with characteristics like a component signal without deterioration or mutual interference due to the synthesis of two signals, and interference such as cross color and dot interference caused by imperfect Y / C separation. Since there is no such thing, it is possible to reproduce and display a high-quality color image with no noticeable deterioration of image quality even on a large-screen monitor television receiver, and at the time of dubbing, it is possible to use a video signal recording device on the input side. The configuration for generating the carrier color signal from the luminance signal and the color difference signal or the line-sequential color difference signal can be eliminated. Further, since the reproduced carrier color signal having the high frequency component around the color subcarrier is output, the output means or the input side is different from the case where the color difference signal or the line-sequential color difference signal having the frequency component from the low frequency is output. Since the coupling capacitor of 2) requires a small capacity, it has a feature that the video signal recording / reproducing apparatus can be downsized.

According to the invention described in claim 1, the reproduction luminance signal and the reproduction carrier color signal for dubbing are respectively output from the first and second output terminals to another VTR and at the same time. Since the reproduced composite video signal can be output to the monitor from the output terminal of 3, there is an effect that dubbing can be performed while confirming the reproduced image quality.

Further, in particular, according to the invention described in the second aspect of the invention, the recording system used for the luminance signal, the carrier color signal, and the composite video signal with a simple configuration is provided by the first and second selecting means. In addition to the effect that they can be used in common, the first selection means and the sync separation means record the luminance signal and the carrier color signal coming into the first and second input terminals at the time of recording, and the third terminal. There is an effect that the sync separation means can be used also when the composite video signal coming in is recorded, and the low-pass conversion color signal can be generated by using the separated sync signal.

Further, in particular, according to the invention described in claim 3, it is possible to serve as the sync separating means not only at the time of recording but also at the time of reproducing, and the low frequency conversion carrier is carried out by using the separated sync signal. There is an effect that the color signal can be returned to the reproduction carrier color signal of the original band.

[Brief description of drawings]

FIGS. 1 and 2 are block system diagrams showing respective embodiments of the present invention, FIG. 3 is a block system diagram showing an example of a conventional device, and FIGS. 4 (A) and 4 (B) are inside the conventional device. It is a block system diagram of each example of a Y / C separation circuit. 9,17,58,59 …… Balance modulator, 27 …… Low-pass conversion Low-pass filter (LPF) for carrier color signal separation, 28 …… High-pass filter (HPF) for frequency-modulated luminance signal separation, 29… … FM demodulator, 51
-1 to 51-3 ... the first set of input terminals, 52-1 to 52-4
...... Second set of input terminals, 53-1,53-2 ...... Third set of input terminals, 54,65 …… Matrix circuit, 61 …… Encoder, 62,69 …… Phase adjuster, 63 ... RY demodulator circuit, 64
...... BY demodulator circuit, 66-1,67-1 ...... Reproduction luminance signal output terminal, 66-2 ...... Reproduction carrier color signal output terminal, 67-2,67
-3: reproduction color difference signal output terminal, 68-1 to 68-3 ... reproduction primary color signal output terminal, 68-4 ... synchronization signal output terminal.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location H04N 9/79 H04N 5/782 K

Claims (3)

[Claims] 1. A first input terminal dedicated to a luminance signal, a second input terminal dedicated to a carrier color signal, and a third input dedicated to a composite video signal.
Input terminal, a first output terminal dedicated to the reproduction luminance signal, a second output terminal dedicated to the reproduction carrier color signal, and a third output terminal dedicated to the reproduction composite video signal, and the first input terminal Means for generating a frequency-modulated luminance signal from an incoming luminance signal or a luminance signal separated from the composite video signal coming into the third input terminal; and a carrier color signal coming into the second input terminal, or Means for generating a low-frequency conversion carrier chrominance signal occupying a band lower than the band of the frequency-modulated luminance signal from the carrier chrominance signal separated from the composite video signal input to the third input terminal; Means for frequency-division-multiplexing the modulated luminance signal and the low-frequency-converted carrier color signal, and recording the frequency-division-multiplexed signal on a recording medium; and reproducing the frequency-division-multiplexed signal from the recording medium, from which the frequency Modulated luminance signal and the low frequency conversion Means for separately filtering the carrier color signal, demodulation means for demodulating the separated frequency-modulated luminance signal to obtain a reproduced luminance signal, and means for separating the low-frequency-converted carrier color signal in the original band. Frequency conversion means for returning to the reproduction carrier color signal, the reproduction luminance signal and the reproduction carrier color signal are output from the first and second output terminals respectively, and the reproduction luminance signal and the reproduction carrier color signal are output. A video signal recording / reproducing apparatus comprising: output means for outputting the reproduced composite video signal obtained by addition from the third output terminal. 2. A first input terminal dedicated to a luminance signal, a second input terminal dedicated to a carrier color signal, a third input terminal dedicated to a composite video signal, a first output terminal dedicated to a playback luminance signal, and a playback. A second output terminal dedicated to the carrier color signal and a third output terminal dedicated to the reproduction composite video signal are provided, and the composite video signal input to the third input terminal is separated into a luminance signal and a carrier color signal. Y / C separation means, first selection means for selectively outputting the luminance signal input to the first input terminal and the luminance signal output from the Y / C separation means, and the second input terminal Second selection means for selectively outputting the carrier color signal that has entered the first and the carrier color signal output from the Y / C separation means, and the frequency-modulated luminance signal from the luminance signal that has passed through the first selection means. Generating means, and a sync separator for separating the sync signal from the luminance signal that has passed through the first selecting means. And means for generating a low-frequency conversion carrier chrominance signal occupying a band lower than the band of the frequency-modulated luminance signal from the carrier chrominance signal that has passed through the second selecting means, based on the synchronization signal, Means for frequency-division-multiplexing the frequency-modulated luminance signal and the low-frequency-converted carrier color signal, and recording the frequency-division-multiplexed signal on a recording medium; and reproducing the frequency-division-multiplexed signal from the recording medium, from which the target signal is reproduced. Means for separating and filtering the frequency-modulated luminance signal and the low-frequency conversion carrier color signal, demodulation means for demodulating the separated frequency-modulated luminance signal to obtain a reproduction luminance signal, and the separated low-frequency conversion Frequency conversion means for returning the carrier color signal to the reproduced carrier color signal in the original band, the reproduced luminance signal and the reproduced carrier color signal are respectively output from the first and second output terminals, and the reproduced luminance signal is outputted. Signal and the reproduction carrier color signal Video signal recording and reproducing apparatus for the regeneration composite video signal obtained by said more becomes possible output means for outputting from the output terminal of the third. 3. A first input terminal dedicated to a luminance signal, a second input terminal dedicated to a carrier color signal, a third input terminal dedicated to a composite video signal, a first output terminal dedicated to a reproduction luminance signal, and a reproduction. A second output terminal dedicated to the carrier color signal and a third output terminal dedicated to the reproduction composite video signal are provided, and the composite video signal input to the third input terminal is separated into a luminance signal and a carrier color signal. Y / C separation means, first selection means for selectively outputting the luminance signal input to the first input terminal and the luminance signal output from the Y / C separation means, and the second input terminal Second selection means for selectively outputting the carrier color signal that has entered the first and the carrier color signal output from the Y / C separation means, and the frequency-modulated luminance signal from the luminance signal that has passed through the first selection means. Generating means, and a first selecting means for selectively outputting the luminance signal and the reproduction luminance signal which have passed through the first selecting means. Selecting means, a synchronizing separating means for separating a synchronizing signal from the signal passed through the third selecting means, and the frequency-modulated luminance signal from the carrier color signal passing through the second selecting means based on the synchronizing signal. Means for generating a low-frequency conversion carrier chrominance signal occupying a band lower than the band, frequency-division-multiplexing the frequency-modulated luminance signal and the low-frequency conversion carrier chrominance signal, and recording the frequency-division multiplexed signal. Means for recording the frequency-division multiplexed signal from the recording medium, and means for separately separating and filtering the frequency-modulated luminance signal and the low-frequency conversion carrier color signal from the recording medium; Demodulation means for demodulating the modulated luminance signal to obtain a reproduction luminance signal, and frequency conversion means for returning the separated low-frequency conversion carrier color signal to the reproduction carrier color signal of the original band based on the synchronization signal, The reproduction luminance signal and the The raw carrier color signal is output from the first and second output terminals, respectively, and the reproduced composite video signal obtained by adding the reproduced luminance signal and the reproduced carrier color signal is output to the third output terminal. A video signal recording / reproducing apparatus comprising: an output unit for outputting more.