JPS63232785A - Time base compressing and recording signal processing system and time base compressing signal recording medium - Google Patents

Abstract

PURPOSE:To generate a correct clock signal by compressing only a color difference signal with a time base without compressing a luminance signal and inserting it in the horizontal blanking period of a component video signal. CONSTITUTION:Only a color difference line sequential signal is compressed with a time base, inserted in the horizontal blanking period of a component video signal and recorded to a recording medium. A color difference sequential signal inserts a color difference signal and a luminance signal in one horizontal period, a horizontal synchronizing signal is provided for the discrimination of a color difference signal at the interval of one line and this is made into the discriminating signal of the color difference signal. A pilot signal to generate a reproducing clock signal is overlapped into the luminance signal by the relation of the band sharing interleave and it is recorded to a recording medium. Namely, a pilot signal to generate a reproducing clock signal, which is a frequency of 2 MHz or above and a luminance signal band or below, the frequency of a horizontal frequency 1/2.(2n-1) of a luminance signal and further, the frequency in the prescribed relation with a clock signal for compressing a color difference signal, is overlapped into the video signal of the period excluding a compressed chrominance component period and recorded to the recording medium.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a time axis compression recording signal processing method and a time axis compression signal recording medium, and particularly relates to a time axis compression recording signal processing method and a time axis compression signal recording medium, and particularly to a video tape recorder (VTR).
), video disk players, etc., and recording media such as magnetic tapes and various disks on which the processed signals are recorded.

(Prior art) Conventionally, there has been a component signal baseband compression signal system called Timeplex, which was proposed before the 8IllIlIl video standard was decided, and MAC (Hutple Analol; 1C), which was being experimented in Europe.
In the component television broadcasting system J3 called "component", there is a method in which color difference signals and luminance signals are compressed in the time axis and transmitted in series on the same line.

(Problems to be Solved by the Invention) However, since each of the above-mentioned methods also compresses the luminance signal, the luminance signal band becomes wider, and a wider transmission band is required compared to the conventional method. There is.

This is a major disadvantage, especially in home video tape recorders, video disc players, etc., which have a limited recording frequency band.

Furthermore, during normal playback, a clock signal must be generated from the video synchronization signal to expand the compressed signal, but in video tape recorders and video disk players, which have jitter, it is not possible to correct the horizontal period, making it less accurate. The problem is that it is difficult to generate a lock signal.

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems of the conventional technology (means for solving the problems). In order to achieve the above-mentioned object, the present invention compresses only the color difference line sequential signal in the time axis and converts it into a component video signal. This is a time-base compression recording signal processing method in which the signal is recorded on a recording medium by inserting the signal into the horizontal blanking period, and the signal is recorded at a frequency of 2M1lz or more and less than or equal to the luminance signal band, and the horizontal frequency of the luminance signal is equal to (2n-1). ) [However, n-1, 2, 3,...
], and further superimposes a pilot signal for creating a reproduced clock signal, which has a frequency in a predetermined relationship with the color difference signal compression glue lock signal, on the video signal of the period excluding the compressed color signal period. The present invention provides a time-axis compressed recording signal processing method characterized in that the component video signal is recorded on the recording medium with a horizontal synchronization signal provided every 1 horizontal line, and differentiated color difference lines. A sequential signal is inserted, and only the color difference line sequential signal is time-axis compressed and inserted within the horizontal blanking period of the component video signal and recorded. , and 1·(2n-1) of the horizontal frequency of the luminance signal [however, n
= 1.2.3,...], and a pilot signal for generating a reproduced clock signal, which has a frequency that has a predetermined relationship with the clock signal for color difference signal compression, except for the compressed color signal period. The present invention provides a time-open axis compressed signal recording medium characterized in that the signal is recorded superimposed on a video signal of a period of time.

(Embodiment) First, as an embodiment of the time axis compression recording signal processing method according to the present invention, a case will be described in which the present recording signal method is applied to a video disk of a capacitance reproduction method.

In this recording signal system, the luminance signal is not compressed, and only the color difference signal is time-axis compressed so that it is inserted within the horizontal blanking period of the component video signal. Furthermore, the color difference signal is a line sequential signal, a color difference signal and a luminance signal are inserted in one horizontal period (line), and a horizontal synchronization signal is provided every other line for color difference signal discrimination. Signal.

In addition, Pyrower 1- for creating a regeneration lock signal.
The signal is superimposed (embedded transmission) on the luminance signal in a band-sharing interleaving relationship and is recorded on a recording medium.

In other words, when the frequency is higher than 2M1lz and lower than the luminance signal band, and the horizontal frequency of the luminance signal is (2n-1) [however, n-1, 2, 3,...], the color difference signal is further compressed. of a frequency that has a predetermined relationship with the glue lock signal.
Pilot signal (Vel) for creating regeneration zero signal
ocimv Pilot) is superimposed (embedded transmission) on the video signal of the period excluding the 11 compressed color signals and recorded on the recording medium.

Note that in the line-sequential color difference signal period, since there is no correlation in the vertical direction when the pilot signals are separated using a comb filter during reproduction, it is preferable to remove the superposition of the pilot signals. It is also possible not to superimpose the pilot signal on the horizontal synchronization signal portion and the vertical blanking portion.

FIG. 2 is a diagram showing a baseband waveform between two horizontal bright areas of the component video signal processed as described above.

In the NTSC system, one Iti trace signal has one horizontal period (
63,556 μsec), the remaining period is a blanking period. In addition, in this embodiment, since the time axis compression rate of the color difference signal is taken as the standard, the color signal area is calculated to be approximately 10.6 μsec, and it is assumed that both do not fall within one horizontal period (hereinafter referred to as H). become. Therefore, here, by widening the blanking period and narrowing the luminance signal area to about 50 μsec,
Arrange each signal as shown in the figure.

In FIG. 2, 1 is a horizontal synchronizing signal with a width of approximately 2 μsec, which is present every other day for the purpose of determining color difference signals.

2 is a period in which there is no horizontal synchronizing signal provided every 1H (line), and this level is the pedestal level, which is the clamp level of the video signal.

3 is a reference level period of a color difference signal having a width of about 1.5 μsec following the period of horizontal synchronizing signal 1 (or period 2 without horizontal synchronizing signal). 50 IRE is appropriate for this level. Note that this reference level is naturally required even for lines without horizontal synchronization signals.

4 is a time-axis compressed color difference signal period that follows the reference level period 3 of the color difference signal. This color difference signal is a line sequential signal, and the color difference signal of the line with the synchronization signal is (R
-Y) signal, and the color difference signal of the line without synchronization signal is (
B-Y) signal.

This is determined by the system, and in the embodiment, the color difference signal of the line with the synchronization signal is the (RY) signal, but this does not limit the selection method in other examples. Since the luminance signal period is 50 μsec as described above, the color difference signal period 4 is 10 μsec. The color difference signal level is set to 100% at ±501RE with 5018E as the center.

5 is a luminance signal period, and although it is not compressed on the time axis, the left and right sides of the picture (image) are removed by about 5%. ! The white peak level of the 9 degree signal is 1001RE, which is the same as the NTSC signal.

During the luminance signal period 5, as indicated by diagonal lines 6 in FIG. 2, a velocity pilot signal fv is superimposed to create a clock signal for time-base compression/expansion of the color difference signal. Also,
In the embodiment, the frequency of this velocity byte signal fv is set to the frequency of the color subcarrier of the NTSC signal, 3.58 Ml.
lz, but this velocity pilot signal f
The frequency of v must satisfy the following conditions.

a) To make the influence of the comb filter during playback less noticeable, set it to 2M1 [1 or more.

b>i Since the signal is embedded in the signal and transmitted, the frequency is set within the luminance signal band.

C) 1/1 of the horizontal frequency so that it can be separated by an I-type filter.
2n-1) [However, the frequency should be n-1, 2, 3°...].

d) To create a clock signal for time axis compression/expansion, set the frequency to a predetermined linear relationship with the clock signal.

The frequency of the velocity pilot signal fv other than the above embodiments is 2,5 which is 5/7 of 3.58 Mllz.
6 Mllz and 13.5M1lZ blue 4, 5MI
Iz is considered. In either case, it is necessary to have a close relationship with the clock signal for time axis compression/expansion, and it is desirable that the write clock signal during recording be the frequency of the velocity pilot signal fv.

The conditions of the clock signal for time axis compression/expansion are determined, in part, from the band of the color difference signal. That is, since the band is limited by the write clock signal, for example, IMI
If a band of 1z or more is required, the frequency of the sneak check signal must be 2M11z or more.

In the example, 3.58 Ml is used as the A input clock signal.
Since lz is used, the color difference signal band is 1.7M1
It is possible to secure lz or more.

On the other hand, if the frequency of the read zero check signal becomes too high, problems will arise with the elements used, so it is necessary to keep it below 20 MIIZ. In the embodiment, the read clock signal is 17.9M11Z, and there is no particular problem.

FIG. 3 is a diagram showing the baseband frequency spectrum of the converted component video signal, where both the luminance signal and the compressed color difference line sequential signal have a band of 6MIIz. Therefore, the band after expansion of the color difference line sequential signal is approximately 1.2M11z.

The component of the luminance signal around 3.58 Mtlz has been filtered in advance by a comb filter, and the velocity pilot signal fv is embedded in that part.

FIG. 1 is a block system diagram showing an embodiment of the time axis compression recording signal processing method according to the present invention.

The input video signals are luminance signal Y2 color difference signal (RY), (B
-Y), and when the program source (input signal) is an NTSC signal, it must be decoded (converted) to the triple code by an external device.

In FIG. 1, a luminance signal Y (hereinafter, Y
signal) is input. As mentioned above, the Y signal is 3.
58 In order to filter the vicinity of MIIZ with a comb filter, 1
A comb filter is composed of circuits 2 to 18.

12 is the 1-day delay line of 3.58 MIIZ, and this 1
Y delayed by F-1 delay line 12 (8@ is 3.58 M
Bandwidth limited by llz narrowband BPF13 to 3.5
8 MIIZ only Y signal.

On the other hand, the undelayed Y signal is also 3.58, which is similar to BPF13.
MIIZ (7) Narrow band 14
3 and the adder 16. Therefore, adder 1
The output of 6 is only the component interleaved with the horizontal frequency.

17 is a correction delay line for correcting the amount of delay by 3PL" 13.14, and the output of this correction delay line 11 is added to the output of the adder 1G in an adder 18, and as a result, the horizontal frequency is interleaved. Thus, a Y signal in which only the component near 3.58 MIIZ is waved is obtained.

Reference numeral 19 denotes a Y signal switch, which switches between a test signal generated by an instruction from an external control terminal 22 and a test signal generator 23 provided inside for checking the disc to be recorded. be.

Note that the details are not particularly relevant to this patent and will therefore be omitted.

The Y signal output from the Y signal switcher 19 is processed by a Y signal processing circuit 20, such as deleting a synchronizing signal, and is then processed by a home VTR or the like in order to change the S/N during playback. The signal is outputted through the dynamic emphasis circuit 21 which is connected to the dynamic emphasis circuit 21.

On the other hand, the color difference signals (R-Y) and (B-Y) respectively input to the input terminals 24 and 25 are converted into line sequential signals by switching circuits 26 and 27 for converting them into line sequential signals, and are converted into 8-bit 8-bit signals. The signal is supplied to the A/D converter 34.

In addition, as a method of line sequentialization, color difference signals of the same line (
There is also a method of A/D converting each of R-Y) and (B-Y) and then delaying one line by one line and switching. In this case, the advantage is that the angle change phenomenon that occurs when there is no line correlation can be avoided. .

Further, blackverse 1~ signals are inputted from the input terminal 28 as reference signals for each circuit, and the sync signal separation circuit 29.
Synchronization signal generator 31. NTSC with subcarrier generation circuit 30
A synchronization signal and a subcarrier of the signal are respectively generated.

32 is a control signal generator for converting the color difference signal into a line sequential signal, and 33 is a clock generation circuit for color difference signal compression. Both circuits 32 and 33 are synchronized signal generators 3
1. NT respectively supplied from the subcarrier generation circuit 30
Necessary signals are generated based on the synchronization signal and subcarrier of the SC signal.

As mentioned above, the A/D conversion clock in the A/D converter 34 and the write clock to the memory 35 are 3.58 V.
t+z, and the read clock from the memory 35 is 3
．． It is 17.9 MItz, which is five times that of 58 MIIZ.

In addition, as another way to select a clock, the clock for fortune-telling on the mechiri is 3.58 2.86 which is 415 times as much as Mllz.
Mllz and read clock 3.58 Mll
It is also possible to set it to 14.3 Mtlz, which is four times z.

The memory 35 is a register or FIFO (Firs) to shift 1.
tIn rirst 0ut), which includes the reference level of the color difference signal, is written in real time at 3.58 HIIZ, and is read out at five times the clock frequency after an appropriate lock pause period.

Although the details of this timing will not be discussed, it is necessary at least to accurately match the timing at which the tif degree signal ends and the timing at which the color difference signal ends. This timing is the re-created horizontal synchronization signal and the velocity pylon 1-signal "V" which is superimposed on the luminance signal.
, 58Ml1z.

Digital data read from memory 35 is D/A
It is returned to a time-base compressed analog signal by a converter 36,
The test signal generator 2 uses the color signal (0M number) switching circuit 40.
It is switched with the test signal output from 3.

Reference numeral 38 denotes an address signal generator, which generates an instruction C from an external control terminal 3γ, such as the track number and time of the disc to be recorded. In addition, this address signal generator 3
8 drives the mode generator 39 at a predetermined time;
C signal switch 40T: Also has the role of issuing a command to create a switching control signal for switching between the test signal and the video signal.

The compressed color difference signal output from the C signal switch 40 is clamped by a clamp circuit & level adjuster 41, and further a blanking signal is added so that the reference level becomes 501RE, and the signal is adjusted to an appropriate level. .

Reference numeral 42 denotes a 1~racking signal generator for reproducing unfilled flat tracks on the disk while tracking, and the tracking pylon 1~signal [pl] has a different number of cycles for each rotation period of the disk.

rp2 and this tracking pilot signal Q r D
A tracking index signal fp3 indicating the switching timing of +*fl)2 is generated.

The tracking pylon l-signal fp+, [;)2 is recorded on the main track of the disc (the sub-track located between the main tracks), so the main signal (luminance signal, color difference signal) recorded on the main track is In addition to the output terminal 43
is output from.

44 is a V pilot signal generator that generates a velocity pilot signal fv for creating a clock for expanding the color difference signal during reproduction, and the generated BeD City Byron 1 to signal fv simultaneously corrects reproduction jitter. It is also used for purposes. Note that this velocity pilot signal tv cannot form a comb filter if it is superimposed on the color difference line sequential signal portion, so it is superimposed on the color difference line sequential signal portion except for the color difference line sequential signal portion.

Note that this is also possible by excluding the horizontal synchronization signal.

The luminance signal processed as above, the compressed color difference line sequential signal, the address signal, the velocity pilot signal (V
, pilot signal) 1 reworked synchronization signal and tracking pylon l-signal [pl.

A tracking index signal fp3 indicating the switching timing of fp2 is superimposed by a mixer 45 to become a component baseband signal. Although the details of J3 and Zon are omitted, the tracking index signal fp3
．． Since the address signal is also superimposed on the vertical blanking period, it does not affect the video portion.

The component baseband signal obtained from the output of the mixer 45 is approximately 6M1lzLPF & equalizer 4G.
After being band-limited by M1lZ and further subjected to delay correction, it is subjected to pre-emphasis for frequency modulation ("M") in a pre-emphasis circuit 47, clamped in a clamp circuit 48, and frequency modulated by a frequency modulator 49. Modulated.

In addition, in this embodiment, the audio signal is recorded as a CM baseband signal;
A single voice signal is input. This PCM fame signal is, for example, like the EFM signal used in the well-known Compact Disc (CI).

The human-generated PCM1i voice signal is band-limited by L P F & Ikora and Isa 51, and after further delay correction,
Duty 4 noise (video FM by durator 52)
The signal is made into a pulse width modulated signal using a PCMg voice signal. This signal is then outputted from the output terminal 53 and becomes the RF multiplied signal which becomes the main recording signal.

FIG. 4 is a diagram showing the frequency spectra of the recording signal and the tracking byte signal.

In the figure, the video FM signal has a sync chip frequency of 13.8M + 12. The pedestal frequency is 7.3 MIIz, and the white peak frequency is 8.6 M11Z.

62 and 63 are velocity pilot signals (V
, pilot signal) f■ sideband (1'5tsB
-, 2'ndsB), and the levels are -22, 2'ndsB, respectively.
3dB, -50, 4dB.

64 is a PCM audio signal transmitted with duty cycle modulation, which is multiplied by f with a level relationship of about -20 dB to an unmodulated FM key 11 rear.

65, 6G is a tracking pilot signal (fp+ is 1
, 3M llz, 1p2 is 1.6MH2), and this is recorded on a sub-track, which is located between the main tracks and the main track, which is different from the main track of the disc. However, for convenience, the frequency relationship is This is shown to clarify.

Next, an embodiment of the t+', 'i axis compressed signal recording medium according to the present invention will be described. Then, the component video signal (including the PCM audio signal) by the time-domain compression recording signal processing method according to the present invention described above is output to the time-domain compression signal recording medium described below, that is, to the output terminal 53 in FIG. An RF multiplied signal such as a video FM signal pulse-width modulated with a PCM audio signal is recorded.

FIG. 5 is a diagram showing the shape of an embodiment of the time-base compressed signal recording medium according to the present invention.

In the figure, a time axis compressed signal recording medium (disk) 5
4 is a conductive disk, on which signals are recorded spirally from the outer circumference to the inner circumference for a maximum of one hour on one side. The starting position is from a position with a diameter of 244 mm, and the outer circumference 3a
+m, 25h+m in diameter is the part where the sensor (needle with electrodes for reading signals) descends first, which is called the lead-in section. This lead-in section has a playback time of 2 minutes and 30 seconds. Therefore, after the sensor lands on this part with the mechanical precision of the playback device, it searches for the beginning of the program (signal), that is, the Oth page (Oth track), and starts playback. . Therefore, the start of playback always begins at the same position, ie at the beginning of 70 grams.

Also, the pitch of the track on which the signal is recorded is 135μ
m, there will be up to 54,000 lines lined up in a one-hour program. The number of revolutions is 90,000 revolutions per minute, or 15 revolutions per second. Therefore, four fields corresponding to two frames of the television signal are recorded in one rotation. exactly 9
One field is recorded every 0 degrees. For a disc containing an entire hour of programs, the end portion will have a diameter of 98.2III11. Therefore, the diameter is 24
It starts with 4u+ and ends with diameter 98, 2mm, so 7
One hour's worth of video signals and two channels of audio signals are recorded within a width of 3 mm. The portion after the program ends is called a program end signal section.

Signals recorded on a disk are expressed by the size of holes (pits) made on the surface of a flat 41 disk, the presence or absence of holes, and the ratio of the area without holes.

In addition, in the part where the horizontal synchronization signal of the video signal (television signal) is recorded, a dragging signal (fp+, fp2) is recorded so that the sensor can correctly trace one track. has been done.

This tracking signal is recorded between an information signal track on which a video signal or an audio signal is recorded and an adjacent information signal track. As shown in FIG. 6, the senna electrode accurately traces the information signal track 1- while simultaneously reading the tracking signals recorded on both sides of the track. In this way, even if the disk surface is flat and has no grooves for sensor tracing, it will be electrically tracked by this tracking signal.

Now, if the sensor shifts to the right and the center of the sensor's electrode deviates from the center of the information signal track and moves to the right, then the tracking signal on the right side will be read more often than the 1~racking signal on the left side. . Therefore, the position of the sensor may be controlled so that the left and right tracking signals are always read equally. As mentioned before, the tracking signal is I'D+ (1,3MIIZ) and rf1
2 (1,6 MIIz), and these two tracking signals are recorded alternately between the information signal tracks. That is, in one rotation, [pl
, there is rD2 on the left side, and in the next rotation, it is the other way around, with [p2° on the right side and fpl on the left side. Therefore,
1 rotation per rotation at the position where the left and right tracking signals are swapped.
A tracking index signal fo3 (2,0 MIIZ) indicating that the data is replaced twice is recorded superimposed on the vertical blanking period of the video signal.

In addition, the width of the information signal hole (pit) is 0.68 to 0.9
5 μm, depth 0.22 to 0.38 μm, and tracking signal hole (bit) width 0.46 to 0.54
μm, and the depth is 0.085 to 0.155 μm. The tracking signal has approximately half the width and depth of the information signal.

In normal playback, the tracking signal fp1. Trace according to the spiral track while reading fp2. At this time, the polarity of V-bo with respect to fp+ and "t)2 is changed every time fp3 is obtained once per rotation.

Furthermore, still image playback is possible by moving the senna back one track per revolution. Note that the track is returned to the fp+ position. Furthermore, slow motion playback can be achieved by alternately repeating still image playback and normal playback.
The speed is determined by the ratio between still image playback and normal playback. Quick motion playback is possible by forcing the sensor to move forward.

In addition, signals recorded on the disk are read by electrically picking up changes in capacitance between the disk, which is made of plastic mixed with carbon particles to make it conductive, and the sensor electrode. It is something. And the hole (
The capacitance value decreases in areas where there are holes (pits).
The capacitance value increases in the part where there is no bit). In addition,
At this time, the change in capacitance value is only about 10-4 pF, but it is about 1 G fiz (1000 M tlz
), the resonance frequency changes by about 150kllz (1/1000).

This change is then detected by an electronic circuit and further amplified.
A video signal and an audio signal are obtained. Additionally, a tracking signal can also be obtained at the same time.

The above is an embodiment of the time axis compressed signal recording medium according to the present invention, and the component video signal by the time axis compressed recording signal processing method according to the present invention described above is recorded on the information signal track of such a recording medium (disk). (including the PCM audio signal), that is, an RF multiplied signal in which the video FM signal outputted to the output terminal 53 in FIG. 1 is pulse width modulated with the PCM audio signal is recorded.

Note that the time axis compressed signal recording medium of the present invention is not limited to the one in which the information signal is recorded by changing the capacitance value as described above, but also the one in which the information signal is recorded by changing the reflectance or transmittance of laser light, for example. It may be recorded or recorded by magnetic change.

Next, another embodiment of the time axis compression recording signal processing method according to the present invention will be described.

This signaling system can also be applied to home VTRs. In this case, unlike the case of the audio disc of the above-described embodiment, there is an advantage that the RFI range can be narrower because a tracking pilot signal is unnecessary.

In addition, the luminance signal band is set to about 5M11Z, and the audio P
If the CM signal is deeply recorded like the high-fidelity audio of a well-known VTR, the FM carrier of the video signal can be recorded at 4.8 MIIZ.
It can be lowered from 6.6M1lz to about 6.6M1lz, and if tape characteristics are taken into consideration, it can be recorded even on current home VTRs.

(Effect of the invention) As described above, the present invention has the following features.

■Since the luminance signal is not time-based compressed, the circuit configuration can be simplified.

(2) By superimposing the pilot 1~ signal (velocity pilot signal) for creating a reproduction clock signal on the luminance signal, jitter removal during reproduction can be easily performed with high viscosity.

■Clock signals can be easily generated during playback.

■Since the velocity pilot signal is interleaved and embedded with the luminance signal, extra bandwidth is unnecessary.

■By providing a horizontal synchronization signal every 11 horizontal intervals,
Color difference signals can be easily discriminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the time axis compression recording signal processing method according to the present invention, and FIG. 2 is a base of two horizontal periods of a combo-screw l-video signal processed by the processing method of the present invention. Figure 3 is a diagram showing the baseband frequency spectrum of the converted component video signal, Figure 4 is a diagram showing the frequency spectrum of the recording signal and tracking pilot signal, and Figure 5 is a diagram showing the baseband frequency spectrum of the converted component video signal. FIG. 6 is a diagram showing the shape of an embodiment of a time-base compressed signal recording medium according to the present invention. FIG. It is a figure for explaining. 1...Horizontal synchronization signal, 2...7-period of horizontal synchronization signal, 3...Reference level period of color difference signal, 4...Time axis compressed color difference signal period, 5... Luminance signal period, 6...diagonal line, 11, 24.25.28.5
0...Input terminal, 12...3.58 Mllz
11-1 delay line, 13, 14... 3.58 Mll
zNarrowband BPF. 15... Inverting amplifier, 16.18... Adder, 17
...Correction delay line, 19...Y signal switch, 20...
・Y signal process circuit, 21...Dynamic emphasis circuit, 22, 37
...External control terminal, 23...Des1~signal generator,
2G, 27...Switching circuit, 29...Sync signal separation circuit, 3G...Subcarrier generation circuit, 31...Sync signal generator, 32...Control signal generator, 33...Color difference Signal compression clock generation circuit, 34...
・A/DI converter, 35...Memory, 36...D/A
Converter, 38...Address signal generator, 39...D
- code generator, 40...C signal switcher, 41...clamp circuit & level adjuster, 42...tracking signal generator, 43, 53...output terminal, 44...V, pilot Signal generator, 45...Mixer, 46...6Ml1zLPF&I] riser, 47.
...Pre-emphasis circuit, 48...Clamp circuit,
49... Frequency modulator, 51... LPF & equalizer, 52... Duty cycle modeler, 54... Time axis compressed signal recording medium (disk), 6
1...Video FM signal, G2.63...V, sideband of pilot signal fv, 64...PCM audio signal, 65,06...Tracking pilot signal. Figure 5

Claims (3)

[Claims] (1) A time-axis compressed recording signal processing method that compresses only the color difference line sequential signal and records it on a recording medium by inserting it into the horizontal blanking period of the component video signal, which is 2MHz or higher and lower than the luminance signal band. and 1/2·(2n-1) of the horizontal frequency of the luminance signal [however,
n=1, 2, 3,...] and a pilot signal for generating a reproduced clock signal having a frequency that has a predetermined relationship with the clock signal for color difference signal compression, and the compressed color signal period. A time axis compression recording signal processing method characterized in that the video signal of the excluded period is superimposed on the video signal and recorded on the recording medium. (2) The time-base compression recording signal processing method according to claim 1, wherein the component video signal is provided with a horizontal synchronization signal every other horizontal period, and a discriminated color difference line sequential signal is inserted. (3) Only the color difference line sequential signal is time-axis compressed and inserted into the horizontal blanking period of the component video signal to be recorded, and the horizontal frequency of the luminance signal is 2 MHz or more and less than or equal to the luminance signal band. 1/2・(
2n-1) [however, at the frequency of n=1, 2, 3,...],
Further, a pilot signal for generating a reproduced clock signal having a frequency having a predetermined relationship with the clock signal for color difference signal compression is recorded superimposed on the video signal for a period excluding the compressed color signal period. A time axis compressed signal recording medium characterized by: