JPH0586710B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention can be used for recording and reproducing devices such as VTRs,
This is particularly effective for performing good time axis correction.

Conventional technology VTRs currently used for broadcasting are
Tapes with a width of 1 inch or 2 inches are mainstream, and their video signal recording method is to directly frequency modulate the composite video signal. During this recording/reproducing process, fluctuations in the time axis occur due to uneven rotation of the head, uneven running of the tape, and the like. This fluctuation is caused by the time base corrector (TBC) during playback.
Correction is made using the horizontal synchronization signal and burst signal in the reproduced video signal. However, in this method, in the case of the NTSC method, the color signal is quadrature two-phase modulated using a 3.58 MHz subcarrier, and is superimposed on the luminance signal. Therefore, when frequency modulated, the color signal is
Because it is separated from the FM modulation carrier, noise reduction, which is a characteristic of FM, is not sufficient.Also, the color subcarrier has a phase fluctuation due to the residual jitter of TBC, which becomes phase noise, and the convergence of the color vector is not sufficient. Not.

From this point of view, as a recording method that improves the S/N in the amplitude and phase directions of the color signal and improves the degree of convergence, the two components of the color signal are also frequency modulated and recorded, and the time axis is adjusted during playback. After correction, to create a composite video signal, it is modulated (encoded) with a reference subcarrier and added to the luminance signal. According to this method, the color signal (component signal) is also recorded as FM in the baseband, so it can be reproduced with good S/N. Also, since it is encoded with the standard subcarrier, it does not have phase noise and has good performance. It is possible to obtain a reproduced color signal.

An example of this method is shown in FIG. 7 and will be described. 7th
In the figure, 1, 2, and 3 are input terminals for the luminance signal Y, R-Y signal, and B-Y signal, respectively; 25 is a synchronization signal generator; 5 is a time-base compressor; 4 and 6 are frequency modulators; 7 and 8 are heads, 9 and 10 are frequency demodulators, 11 and 12 are TBCs, 14 is a reference signal input terminal, 15 is a sync generator, 16 is an encoder, 18, 19, 20, and 21 are respectively,
This is an output terminal for Y, R-Y, B-Y signals, and composite video signals. The Y signal applied to the terminal 1 is modulated by a frequency modulator 4 and recorded on a tape by a hardware 7. On the other hand, the two color signal components R-Y signal and B-Y signal applied to terminals 2 and 3 are
The synchronization signal generated by the synchronization signal generator 25 is added to the horizontal synchronization signal in the signal by the adder 26 (Fig. 8 a, b), and the time is reduced by half in line units by the time axis compressor 5. Axial compression, R-Y・B-Y・R-
After being converted into one signal (RY represents the R-Y signal compressed to 1/2 line) as Y, B-Y... (Fig. 8c), it is modulated by the frequency modulator 6. and recorded on tape by head 8. The luminance signal and the color signal form separate tracks by heads 7 and 8 and are recorded on the tape. When playing,
The Y signal reproduced from the head 7 is demodulated by the frequency demodulator 9, and then the time axis is corrected by the TBC 11. In addition, the color signal reproduced from the head 8 is
After being demodulated by the frequency demodulator 10, the time axis is corrected by the TBC 12 and expanded to the original time axis. The TBCs 11 and 12 write a signal into the memory using a write clock generated from a horizontal synchronization signal in the reproduced and demodulated signal, and write a read clock 2 generated by a sync generator 15 from a reference signal applied to a terminal 14.
2 and 23, time axis correction and expansion operations are performed by reading signals from the memory.
In addition, the synchronization signal is removed here, and the Y signal is
A reference synchronization signal 24 created by a sync generator 15 is added by an adder 13. In this way, the synchronization signal is replaced with a noise-free synchronization signal, and reproduced Y, R-Y, B-Y signals are obtained at the terminals 18, 19, and 20. On the other hand, the output R-Y of TBC12,
The B-Y signal is encoded by the encoder 16 using the reference subcarrier 27 created by the sync generator 15, and added to the Y signal by the adder 17, so that a reproduced composite video signal is obtained at the terminal 21.

Problems to be Solved by the Invention However, in this method, the TBC creates a write clock only with the horizontal synchronization signal in the reproduced signal, so it is difficult to completely follow the jitter of the signal. Furthermore, during dubbing, a synchronization signal is added to the R-Y signal output from terminal 19 by the adder 26 in the VTR to be recorded next, so if dubbing is repeated, the coupling error at this time will accumulate. There is a problem in that the time axis correction characteristics during dubbing are deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to satisfactorily remove time axis fluctuations that occur during recording and reproduction of video signals, and to obtain stable and good component outputs and composite video signal outputs.

Means for Solving the Problems The present invention provides means for adding a burst signal to at least one of three component signals constituting a video signal and recording it on a recording medium, and reproducing the three component signals from the recording medium. and a memory for storing the three reproduced component signals, write the reproduced signal in the memory using a clock generated from the added burst signal, and read it using the reference clock, thereby adjusting the time axis of the reproduced signal. and a first synchronization signal that generates a color subcarrier and a synchronization signal constituting the composite video signal in synchronization with the reference signal when the reference signal is applied and free-running when the reference signal is not applied. a signal generating means, an output synchronization signal of the first synchronization signal generation means, and a signal obtained by encoding the three time-axis corrected component signals with a color subcarrier created by the first synchronization signal generator; a second synchronizing signal generating means for generating a burst signal synchronized with the output signal of the first synchronizing signal generating means and a read clock for the memory from the output signal of the first synchronizing signal generating means; and means for adding a burst signal generated by the second synchronizing signal generating means to the three time-base corrected component signals and outputting the resultant signal.

Function In the recording and reproducing apparatus of the present invention, a burst signal added to a component signal during reproduction,
The same synchronization signal generation means generates the read clock used in the memory for time axis correction of the reproduced component signal, and this synchronization signal generation means also generates a synchronization signal to be added to the composite video signal. The frequency of each generating means can be set appropriately, and the position of the mutual signal and synchronization signal of the component signal output and composite video signal output can be adjusted independently. . Furthermore, during dubbing, a burst signal that is precisely timed with the component output signal added by the playback VTR is recorded and played back together with the video signal, and during playback, highly accurate time axis correction can be performed based on this burst signal. .

Embodiment A recording system of a recording/reproducing apparatus according to an embodiment of the present invention is shown in FIG. 1a, and a reproducing system is shown in FIG. 1b. In the figure, components that operate in the same way as in FIG. 7 are given the same numbers.

In FIG. 1a, 28 is a burst detector that detects a burst signal in the Y signal applied from terminal 1. 29 and 30 are this burst detector 2
This is a switch controlled by the output of 8. 3
1 and 32 are adders. A synchronization signal/burst generator 46 generates a horizontal synchronization signal to be added to the color signal and a burst signal to be added to the Y signal and the color signal from the horizontal synchronization signal in the Y signal.

FIG. 2 shows details of one embodiment of this synchronization signal/burst generator 46. In Figure 2, 461
is a horizontal sync signal separator, and Y applied to terminal 1
Separate the horizontal sync signal from the signal. 462 is a variable oscillator, and 463 is a frequency divider that divides the output of the variable oscillator 462 by n. The phase comparator 464 is
The phase of the horizontal synchronizing signal separated from the Y signal and the output signal of the variable oscillator 462 divided by n is compared, and the variable oscillator 462 is controlled by the output.
As a result, a signal with a frequency n _H (n: integer, _H : horizontal frequency) is obtained as the output of the variable oscillator 462. A burst flag generator 465 creates a burst flag signal from the horizontal synchronization signal separated from the Y signal. The output of the variable oscillator 462 is
The gate circuit 466 is activated by the burst flag signal.
A burst for the Y signal is obtained at terminal 467. 468 converts the output of variable oscillator 462 to 1/
This is a frequency divider that divides the frequency into two. This 1/2 frequency-divided signal is gated by the gate circuit 469 using the burst flag signal, and a burst for the RY signal is obtained at the terminal 470. In addition, the terminal 460 has n
A synchronizing signal for the RY signal, which is the output of the frequency divider 463, is obtained.

In FIG. 1a, the Y signal applied to terminal 1 is guided to a burst detector 28, where the presence or absence of a burst signal is detected. When the burst detector 28 determines that there is no burst, the switch 29
and 30 are closed, the adder 31 adds a burst signal to the Y signal, and the adder 32 adds R-Y
A horizontal synchronization signal and a burst signal are added to the signal. Here, when the burst signal is superimposed on the input Y signal, the horizontal synchronization signal and the burst signal are also superimposed on the input R-Y signal, and when the burst signal is not superimposed on the input Y signal, the R-Y signal is superimposed on the input Y signal. There is no horizontal synchronization signal or burst signal on the signal either. Therefore, the detection of the burst signal may be performed using the RY signal. The frequency of the burst signal is
It is set to a convenient frequency (for example, an integer fraction of the clock frequency) for creating a write clock in the TBC. To give an example, TBC clock frequency _C = 13.5MHz (for NTSC system)
858 _H : When _H is the horizontal frequency), the burst signal of the Y signal _{is BY} = 2.25 MHz (= 143 _H = _C / 6),
_BC = 1.125MHz (=
_BY /2 = 143 _H /2 = _C /12). In this way, the Y signal to which the burst signal has been added is modulated by the frequency modulator 4 and recorded on a tape by the head 7. On the other hand, the R-Y signal to which the horizontal synchronization signal and the burst signal have been added and the B-Y signal applied to the terminal 3 are processed by the time base compressor 5 as shown in FIG. 8c, as in the case of FIG. After being compressed into a single signal, it is modulated by a frequency modulator 6 and recorded on tape by a head 8.

In FIG. 1b, 51 is a sink generator, which is comprised of circuits 39 to 45. Details of this sink generator 51 will be described later.

During reproduction, the signal reproduced by the head 7 is demodulated by the frequency demodulator 9 and time-base corrected by the TBC 11. This time axis corrected Y signal is sent to the adder 3
3, the synchronization signal created by the sync generator and the burst signal 37 are added and output to the output terminal 18. Further, the time axis corrected Y signal is
The adder 35 adds the color signal encoded by the encoder 16 and the synchronization signal 36 created by the sync generator 51, and outputs it to the terminal 21 as a decoded video signal. On the other hand, the signal reproduced by the head 8 is demodulated by the frequency demodulator 10,
The time axis is corrected and expanded by the TBC 12, and then expanded to the original time axis. Of the two expanded color signals, the R-Y signal is sent to the adder 34.
The horizontal synchronization signal and burst signal 38 created by the sync generator 51 are added to the output terminal 19.
is output to. Further, the B-Y signal is output to the terminal 20. Also, the output R-Y, B- of TBC12
The Y signal is encoded by the encoder 16 using the subcarrier 27 created by the sync generator 51.

The write clock applied to TBCs 11 and 12 in FIG. It is created by setting its phase using a burst signal. Therefore, it is possible to create a clock that more accurately follows the time axis fluctuations of the reproduced video signal than in the case of FIG. 7, and it is possible to perform good time axis correction in the TBCs 11 and 12.

Next, for details of TBC11 and 12, see Figure 3.
This will be explained using FIG.

TBC11, 12 are A/D converters 52,
It is composed of a WRITE PLL 53, a MEMORY 54, and D/A converters 55 and 56. D/A converter 56 is used only in TBC 12. From the output Y and C signals of the frequency demodulators 9 and 10,
TBC write clock 63 with WRITE PLL53
(13.5MHz) is created. The write clock is synchronized with the output signals 9 and 10. The output signals of the frequency demodulators 9, 10 are the write clock 63.
The signal is converted into a digital signal by the A/D converter 52 and written to the MEMORY 54.
The signals written in the MEMORY 54 are read out by the reference read clocks 22 and 23 created by the sync generator 51, time axis fluctuations are removed, and the signals are returned to analog signals by the D/A converters 55 and 56. At this time, the C signal is
Written at 13.5MHz, R-Y, B- at 6.75MHz
It is read out in Y parts and expanded twice.

WRITE PLL53 is horizontal synchronization signal separator 5
7. Burst gate 58, VXO59, frequency divider 6
0, a phase comparator 61, and a phase setter 62. A horizontal synchronizing signal is separated from the output Y and C signals of the frequency demodulators 9 and 10 by a horizontal synchronizing signal separator 57. This horizontal synchronization signal and the variable oscillator VXO
A signal whose frequency is divided by n by a frequency divider 60 is sent to a phase comparator 61, where the phases are compared. The VXO 59 is controlled by the output error signal of the phase comparator 61, and a continuous signal of frequency n _H ( _H : horizontal frequency) is obtained as its output. If n=858, n _H =13.5MHz. On the other hand, a burst signal is separated from the outputs of the frequency demodulators 9 and 10 by a burst gate 58 and guided to a phase setter 62. The output signal of the VXO 59 is led to the other input of the phase setter 62,
The phase of this signal is set to the phase of the burst signal. In this way, the 2.25MHz burst signal
By setting the phase of the WRITE clock,
A more accurate clock can be obtained than with an AFC-only configuration using a 15.73KHz horizontal synchronization signal. VXO
59 is an integral multiple (for example, 4 times) of 13.5MHz, and when setting the phase with the phase setter 62,
For example, it is also effective to select the phase closest to the burst out of four phases obtained by dividing the output of the VXO by four, and to further match the phase to the burst phase.

Next, the sink generator 51 will be explained. A burst signal is separated from the reference video signal applied to the terminal 14 by the burst gate 39,
The signal is guided to a phase comparator 40. On the other hand, the output signal of the variable oscillator 41 composed of a stable element such as a crystal resonator (the oscillation frequency is
14.3MHz [=910 _H = _SC : _SC is the NTSC color subcarrier frequency 3.58MHz]) is the sync generator 4
4, color subcarrier 27, composite synchronization signal 3
6. A horizontal synchronization signal 48, a burst flag signal, a blanking signal, etc. are created. The output color subcarrier 27 of the sync generator 44 is transmitted to the phase comparator 4.
0, the phase is compared with the burst signal output from the burst gate 39, and the variable oscillator 41 is controlled by the error signal 49. In this way,
A continuous signal synchronized with the reference video signal is obtained at the output of the oscillator 41. Although the burst signal in the reference video signal is used to configure this loop, a loop configuration using a horizontal synchronization signal may also be used. Also,
If the reference video signal is not applied to terminal 14,
The oscillator 41 oscillates in free running, and is frequency-divided and decoded by the sync generator 44 to create various reference signals. The sink generator 51 has one more loop. A horizontal synchronizing signal 47 is generated by a sync generator 45 from an output signal (for example, a frequency of 13.5 MHz [=858 _H : NTSC system]) of a variable oscillator 43 composed of a stable element such as a crystal resonator, and a sync generator Nerator 4
The horizontal synchronizing signal 48 which is the output of phase comparator 4
2 and their phases are compared, and the variable oscillator 43 is controlled by the error signal 50, and its output is synchronized with the output signal of the sync generator 44, that is, synchronized with the reference video signal from the terminal 14. A continuous signal is obtained. This signal is led to the sync generator 45, frequency-divided and decoded,
The read clock 22 of the TBC 11 (eg, frequency 13.5 MHz [=858 _H = _C ]), the read clock 23 of the TBC 12 (eg, frequency 6.75 MHz [=
429 _H = _C / 2]), horizontal synchronization signal 47, synchronization signal and burst signal 3 to be added to the Y output signal
7. A horizontal synchronizing signal and a burst signal 38 to be added to the R-Y output signal, a blanking signal for TBC, a control signal, etc. are created. The color signal is
Write _C / with _C clock at TBC12
It is expanded by two times by reading it with two clocks. In this way, among the signals created by the two loops, the color signal is encoded 16 using the color subcarrier 27 created by the first loop (sync generator 44) (a burst signal is also added). , the synchronization signal 36 and the Y signal, also created by the sync generator 44, are added 35, and a composite video signal is obtained at the terminal 21. Furthermore, the synchronization signal and burst signals 37 and 38 created by the second loop (sync generator 45) are
Adders 33 and 34 are added to the Y signal and the R-Y signal.
and output to terminals 18 and 19.

By configuring two loops in this way, the oscillator and TBC clocks for creating color subcarriers for encoding and the oscillator frequency for creating burst signals added to component signals can be independently set to the most appropriate frequency. You can choose any value. Furthermore, the positional relationship between the positions of the synchronization signal and burst signal of the encode output and those of the component output can also be adjusted independently. In addition, by creating the synchronization signal and burst signal for encode output in one loop and the component output in another loop, even if the relative positional relationship between the two loops shifts due to temperature etc. Also, the positional relationship between the synchronization signal of the encode output itself and the burst signal, and the Y and R between component signals
- Since the positional relationship between the synchronization signal of the Y signal and the burst signal does not deviate, there is no positional deviation between the component Y signal and the color signal, and good timing can always be obtained.

In the embodiment shown in FIG. 1, a method was explained in which a synchronization signal and a burst signal to be added to a component signal are created in the second loop. However, the synchronization signal is created in the first loop, and only the burst signal is created in the second loop. You may create more. This is because, in this case, the stability of the positional relationship between the synchronization signal added to the component signal and the burst signal is lower than in the case of FIG. - Since it is set by the burst signal added to the Y signal, at least the burst signal should be created from the second loop and be sure to maintain a stable positional relationship with the output Y signal and R-Y signal. Good. Since the synchronization signal is used for creating a continuous signal by AFC when creating a write clock and for separating burst signals, the purpose of the TBC according to the present invention can be achieved even if the synchronization signal is not in a completely fixed positional relationship with the burst signal. .

Here, details of the sink generators 44 and 45 in the sink generator 51 will be explained.

The sink generator 45 includes a 6 frequency divider 64, 2
It is composed of a frequency divider 65, gate circuits 66, 67, 429 frequency divider 68, 2 frequency divider 69, burst flag generator 70, 525 frequency divider 71, and decoder 72. The output signal of VXO43 (13.5MHz) is 429
The frequency is divided by a frequency divider 68 to obtain a signal with a frequency of _2H . This _2H signal is further divided by a frequency divider 69 to obtain a signal of frequency _H (horizontal frequency). From this signal, a burst flag for gating the burst signal section is created by the burst flag generator 70. Also, the _2H signal is
The frequency is divided by a 525 frequency divider 71, and a signal of frequency _V (vertical frequency) is obtained. These _2H , _H , and _V signals are decoded by a decoder 72 to obtain a composite synchronization signal. This composite synchronization signal is used as a synchronization signal for the Y signal. Further, _{the H} signal is used as a RY synchronization signal. On the other hand, the output signal of the VXO 43 is frequency-divided by a 6-frequency divider 64 and further by a 2-frequency divider 65, and gated by gate circuits 66 and 67 using the burst flag. The output of the gate circuit 66 is a burst for Y (frequency 2.25MHz), and the output of the gate circuit 67 is a burst for R-Y (frequency 2.25MHz).
1.125MHz) is obtained.

When the synchronization signal added to the component output signal is the output signal of the sync generator 44, the sync generator 45 does not require the broken line portion 73, and can be simplified in configuration.

Note that the synchronizing signal generating section of the sync generator 44 is a 455 frequency divider instead of the frequency divider 68 in FIG.

FIG. 6 shows a block diagram of another embodiment of the sink generator 51 and will now be described. In FIG. 6, the same numbers as in FIG. 1b represent the same things and perform the same operations. 421, 422, 431, 432, 45
1,452 are 42, 43, and 4 in Figure 1b, respectively.
It is the same as 5 and performs the same operation. The first loop is composed of a burst gate 39, a phase comparator 40, a variable oscillator 41, and a sync generator 44.
It is exactly the same as FIG. 2b. phase comparator 421,
A second loop composed of a variable oscillator 431 and a sync generator 451 generates a synchronization signal to be added to the output Y signal of the component, a burst signal 37, and an output R, in the same manner as in FIG. 1b.
A horizontal synchronization signal and a burst signal 38 are created to be added to the -Y signal. In addition, the phase comparator 42
2. Variable oscillator 432, sink generator 45
2, TBC11,
Twelve read clocks 22 and 23 are created. In this way, by separating the loop for creating the synchronization signal and burst signal to be added to the component output and the loop for creating the TBC readout clock, the phase of the TBC readout clock can be changed to the second loop. can be changed independently and the position of the output signal can be adjusted. In this case as well, since the signals 37 and 38 are created in one loop, the relative positional relationship does not shift, and good timing can always be obtained.

In the first and second embodiments described above, the synchronization signal and the burst signal are added only to the R-Y signal, but by adding the synchronization signal and the burst signal or the burst signal to the B-Y signal as well. , B
-Time axis fluctuations in the Y signal can be removed more accurately.

Further, in the second embodiment, the second and third loops are controlled by the output horizontal synchronizing signal of the first loop, but there are other methods in which all the loops are controlled by the reference video signal, and the second and third loops are controlled by the reference video signal. Various modifications are possible, such as a method in which the first loop is controlled by the output horizontal synchronizing signal.
Furthermore, in the first and second embodiments described above, a method was described in which two components of a color signal are compressed in the time axis into one signal, frequency modulated, and recorded.
The present invention is also effective in a method in which two color signal components are frequency-modulated separately and frequency-multiplexed and recorded, and in a method in which two color signals are frequency-modulated line-sequentially and recorded. In addition to the method of recording the Y signal and color signal by forming separate tracks in separate heads as explained above, it is also possible to record the frequency-modulated color signal in the low frequency region of the frequency-modulated Y signal. The present invention is also effective in a method of recording data in a superimposed manner using one (or one pair) of heads.

Effects of the Invention According to the present invention, color signals can be recorded and reproduced with good S/N not only in the amplitude direction but also in the phase direction, and good time axis correction can be performed not only in self-recording and playback but also in dubbing. This allows for stable time axis correction and timing alignment of the Y signal and color signal even against temperature changes. In addition, the synchronization signal and burst signal created by the standard sync generator are added to the output of the Y signal and R-Y signal, and since these signals are recorded as they are during dubbing, the Y signal is reused during recording. There is no accumulation of coupling errors unlike when the horizontal synchronization signal is created using horizontal synchronization signals, and excellent time axis correction can be performed even during dubbing.

[Brief explanation of the drawing]

FIG. 1a is a block diagram of the recording system of a recording and reproducing apparatus according to an embodiment of the present invention, b is a block diagram of the reproducing system, and FIG. 2 is a detailed diagram of the synchronization signal/burst generator in the recording and reproducing apparatus of FIG. Figure 3 is a block diagram showing details of TBC11 and 12 in Figure 1, Figure 4 is a block diagram showing details of TBC11 and 12 in Figure 3.
FIG. 5 is a block diagram showing details of the WRITE PLL, FIG. 5 is a block diagram showing details of the sync generator in FIG. 1, and FIG. 6 is a block diagram showing another embodiment of the sync generator in the recording/reproducing apparatus shown in FIG. , FIG. 7 is a block diagram showing a conventional recording and reproducing apparatus, and FIGS. 8a, b, and c are waveform diagrams for explaining the operation of the time axis compressor in the recording and reproducing apparatus of FIG. 7. 4, 6... Frequency modulator, 5... Time axis compressor, 9, 10... Frequency demodulator, 11, 12...
TBC, 16... Encoder, 28... Burst detector, 29, 30... Switch, 31-35...
... Adder, 39 ... Burst gate, 40, 42
... Phase comparator, 41, 43 ... Variable oscillator, 4
4, 45, 51... sink generator, 46...
...Sync signal/burst generator.

Claims (1)

[Scope of Claims] 1. A means for adding a burst signal to at least one of three component signals constituting a video signal and recording it on a recording medium, a means for reproducing the three component signals from the recording medium, and a means for reproducing the three component signals from the recording medium; means for correcting the time axis of the reproduced signal by writing the reproduced signal into the memory using a clock generated from the added burst signal and reading it using the reference clock; , which generates a color subcarrier constituting a composite video signal and a synchronization signal to be added to the composite video signal, in synchronization with the reference signal when it is applied, and free-running when the reference signal is not applied. a synchronization signal generation means, an output synchronization signal of the first synchronization signal generation means, and the three time-axis corrected component signals are encoded with a color subcarrier generated by the first synchronization signal generator. a second synchronization circuit that generates a burst signal synchronized with the output signal of the first synchronization signal generation means and a read clock of the memory; A recording/reproducing apparatus comprising: a signal generating means; and a means for adding and outputting a burst signal generated by the second synchronizing signal generating means to the three time-base corrected component signals. . 2 The second synchronization signal generating means includes a burst signal,
The means for generating a synchronization signal to be added to the component signal in addition to the memory read clock, and adding and outputting the burst signal is configured to combine the burst signal generated by the second synchronization signal generating means and the synchronization signal with three synchronization signals. 2. The recording/reproducing apparatus according to claim 1, wherein the recording/reproducing apparatus is added to at least one of the component signals. 3. The recording/reproducing apparatus according to claim 1, wherein the memory write clock is created based on a horizontal synchronization signal and a burst signal in the reproduction component signal. 4 The three component signals are the luminance signal and
The recording and reproducing apparatus according to claim 1, characterized in that the recording and reproducing apparatus comprises two color signal components, multiplexes and records the two color signal components, and separates the two multiplexed color signal components at the time of reproduction. . 5. The means for multiplexing the two color signal components is a means for compressing the time axis and multiplexing, and the means for separating during reproduction is a means for expanding and separating the two color signal components compressed and multiplexed in the time axis. A recording/reproducing apparatus according to claim 1, characterized in that: