JPS61219283A - Picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the S/N of a reproducing MUSE signal by recording the frequency multiplex of a horizontal burst signal with a MUSE signal to a medium and generating a synchronizing signal from this horizontal burst signal. CONSTITUTION:A multiple signal that is added to the output HPF12 of a reproducing amplifier 11 with eliminating the horizontal burst signal by transiting the HPF12 is added and demodulated at an FM demodulator 13 and a MUSE signal B is reproduced. On the other hand, the multiple signal that is added to a BPF14, by transiting the BPF14, outputs a reproducing horizontal burst signal that has a fitter and the zero-cross of the reproducing horizontal burst signal is detected at a zero-cross detector 15. A gate signal circuit 16 generates a gate signal and this gate signal is added at a horizontal gate pulse generating circuit 17 and arranged and added to a horizontal synchronizing detector 18 and the zero-cross point of the horizontal burst signal is taken out. Thus, a reproducing horizontal synchronizing signal (i) that represents the position of a positive electrode horizontal synchronizing signal of the MUSE signal B is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording and reproducing apparatus that records and reproduces a MUSE signal obtained by band-compressing a high-definition television (TV) signal.

[Conventional technology]

FIG. 7 is a diagram illustrating a method for recording the MUSE signal in a #& picture replay device such as a video tape recorder, which has already been developed by the applicant. is compressed in time in units of one horizontal period (IH), and a negative horizontal synchronization signal (hereinafter referred to as a negative polarity synchronization signal) and a burst signal for jitter detection are placed in the temporally vacant part, as shown in the figure, for example. In the inserted figure, C indicates a color signal, Y indicates a luminance signal, and CQ and YQ indicate a time-compressed color signal and a luminance signal, respectively. The positive horizontal synchronization signal consists of two signal levels, the high level being 3/4 of the white level. The low level is 1/4 of the white level. The MUSE signal subjected to the above processing is hereinafter referred to as MUSE signal A, and after being modulated by the signal wave of this MUSE signal A, it is recorded on tape.

Then, during playback, the MUS is played back from the tape by the head.
The E signal A signal wave/D conversion is performed, the negative polarity synchronization signal and the burst signal are removed, and the time is expanded, and the signal is returned to the original MUSE signal. In this case, it is necessary to clamp and A/D convert the MUSE signal A signal wave D before converting it. Furthermore, the reproduced MUSE signal A signal wave has jitter caused by uneven rotation of the drum, etc., and in order to remove this jitter, the aforementioned burst signal for jitter detection is used. That is, this burst signal for jitter detection is
Jitter detection is performed in a well-known time base collector by separating the SE signal A signal wave or by detecting the signal position during the MUSE signal A signal. The burst signal is separated by synchronously separating the MUSE signal A signal and the eclipsing synchronization signal to generate a burst flag signal, and then extracting the burst signal. Further, the position of the burst signal is detected based on the leading edge or trailing edge of the synchronously separated negative synchronous signal. For this reason, the method shown here uses the seventh
As shown in Figure (b), a negative synchronization signal is inserted together with the burst signal.゛Here, the MUSE signal A into which the negative synchronization signal is inserted is
7th frequency allocation when signal wave FM modulation
In Figure (C), fS indicates the FM carrier frequency at the tip of the negative synchronization signal, fB and fW indicate the FM carrier frequency of the black level and white level of the MUSE signal, respectively. 0 Normally, negative synchronization signal level vs. video signal Since the black to white level ratio of the FM-modulated M
The breakdown of the USE signal A signal wave number deviation Δf is (
fB-fS): (fW-fB)=3 near.

[Problem that the invention seeks to solve]

In this way, in the system shown in Fig. 7, 3/10 of the FM frequency deviation Δf must be allocated to the negative synchronization signal, and the frequency deviation from the black level to the white level of the MUSE signal A is 77 of Δf
It becomes 1O. Therefore, the frequency deviation Δf is MU
Compared to the case where the SE signal is assigned from the black level to the white level, the SLN of the reproduced MUSE signal A will be 3 dB lower, so in order to achieve the same SLN, a head with electromagnetic conversion characteristics with 3 dB better sensitivity is prepared. There is a need to.

In addition, the MUSE signal is time-compressed in order to insert a negative synchronization signal, so the wave number band of the MUSE signal A becomes correspondingly wider, resulting in problems such as an increase in the band to be recorded on the video tape recorder. Ta.

This invention was made to solve the above-mentioned problems, and it is possible to easily clamp the reproduced MUSE signal A without inserting a negative synchronization signal into the MUSE signal, and also to separate burst signals for jitter detection. It is easy to detect the position of the burst signal, and the position of the burst signal can be easily detected.
It is an object of the present invention to obtain a recording/playback device that can improve the SIN of signal A.

[Means for solving problems]

The recording/playback device according to the present invention converts a horizontal burst signal having position information of a positive horizontal synchronization signal of a MUSE signal into an FM
Adding means for frequency multiplexing the modulated MUSE signal;
A reproduction horizontal burst signal processing circuit is provided which extracts the horizontal burst signal and generates a synchronization signal during reproduction, and this synchronization signal is used for detecting the position of the positive horizontal synchronization signal in the MUSE signal. be.

[Effect]

In this invention, the horizontal burst signal is frequency-multiplexed on the MUSE signal and recorded, and the horizontal burst signal is extracted during playback, thereby detecting the position of the positive horizontal synchronization signal of the MUSE signal and generating the horizontal synchronization signal. and at the same time MU
Generates SE signal A signal wave pump pulse, burst signal extraction pulse, burst signal position detection, signal, etc., making it unnecessary to insert a negative synchronization signal as in conventional devices.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is an input terminal into which the MUSE signal is input;
2 is an A/D converter, 3 is a burst insertion circuit,
This method compresses the time of the digitized MUSE signal using a memory (not shown), inserts a burst signal for jitter detection, and then converts it into a D/A. signal (hereinafter referred to as MUS)
E signal B) is obtained. 4 is A/D converted M
This clock generator 4 generates a 16.2 MHz sample clock from the USE signal, and generates various clocks necessary for inserting the burst signal from this resample clock.
It also detects the positive horizontal synchronization signal in the USE signal. Further, 5 is an FM modulator, 6 is a horizontal burst signal generator that generates a horizontal burst signal using the horizontal synchronization signal from the clock generator 4, and 7 is a frequency multiplexer for frequency-multiplexing the FM-modulated MUSE signal B signal and the child burst signal. Adder, 8.
1 is a recording amplifier, SL is a changeover switch connected to an R terminal during recording and a P terminal during playback, 9 is a head, and 10 is a tape.

Further, 11 is a reproduction amplifier, 12 is a bypass filter (HPF) that removes the horizontal burst signal, 13 is an FM demodulator, 14 is a band pass filter (BPF) that extracts the horizontal burst signal, and 15 is a zero-crossing filter for the horizontal burst signal. 16 is a gate signal circuit that generates a signal for gating the zero cross position of the horizontal burst signal from the horizontal burst signal, 17 is a horizontal gate pulse generation circuit, 18 is a horizontal synchronization detection circuit, and 19 is a horizontal synchronization signal output. This is the terminal for Further, 20 is a clamp pulse generation circuit, 21 is a clamp circuit, 22 is an output terminal of the clamp circuit 21, 23 is a burst flag circuit, 24 is a burst gate circuit, and 25 is a terminal for outputting a burst signal for shifter detection.

Figure 2 shows the time base collector, in which 2
6 is an input terminal connected to the output terminal 22 of the clamp circuit, 27 is an A/D converter, 28 is a memory, and 29 is a D/D converter.
A converter, 30 is a reproduction MUSE from which time axis fluctuations have been removed.
This is the terminal from which the signal is output. 31 is a terminal to which a horizontal synchronizing signal is input, and this is connected to the terminal 19 shown in FIG. 32 is a terminal into which a burst signal for jitter detection is input, and this is connected to the terminal 25 shown in FIG. 33 is a write clock circuit, and 34 is a read clock circuit.

Next, the operation will be explained.

A MUSE signal to be recorded is input to the input terminal 1.

The waveform of this MUSE signal is shown in Figure 3 (al).
The USE signal is digitized by the A/D converter 2 and sent to the burst insertion circuit 3 and also to the clock generator 4 at the same time. In the clock generator 4, as described above, <16.
Memory circuit, memory control circuit, and D/A that generates a 2MHz sample clock and performs time axis compression to insert a burst signal into the digitized MUSE signal.
converter (these circuits are not shown) and A/D converter 2
various clocks synchronized with the sample clock are generated, and a horizontal synchronization signal is detected. These various clocks are sent to the burst insertion circuit 3, and the output of the burst insertion circuit 3 is a MUSE signal into which a jitter detection burst signal converted into an analog signal is inserted, ie, a MUSE signal B signal. This MUSE signal B signal is shown in diagram (b).

On the other hand, the horizontal synchronization signal detected by the clock generator 4 is sent to the horizontal burst signal generator 6, and a horizontal burst signal having a burst frequency of fHB is generated. Figure 3 (C
1 shows the waveform of this horizontal burst signal. The horizontal burst signal consists of one cycle, and its zero-crossing point coincides with the midline horizontal synchronization signal position (point P) of the MUSE signal B signal shown in the figure (bl). The polarity of the horizontal synchronization signal of the MUSE signal is as shown in Fig. 4 for 1125 scanning lines, and the polarity is reset at the 607th line.Therefore, the time-compressed MUSE signal B Here, the polarity of horizontal burst No. 16 is similar to the MUSE signal B signal in Fig. 3(b).When the polarity of the synchronization signal changes from low level to high level, it changes from negative level to positive level. When the horizontal burst signal changes from a high level to a low level, the horizontal burst signal is configured to change from a positive level to a negative level.This horizontal burst signal is sent to an adder 7.

The 1usE signal B which is the output of the burst insertion circuit 3 is F
The signal is FM modulated by the M modulator 5, and frequency components below the lower first sideband are removed by an HPF (not shown) and added to the adder 7, where it is frequency multiplexed with the horizontal burst signal.

Figure 5(a) shows the FM-modulated MUSE signal B signal-like spectrum, where fB and fW are the FM-modulated MUSE signal B signal-like spectrum, respectively.
USE signal B signal-like bell, white level FM carrier frequency, and Δf indicates frequency deheation, MUS
If the E signal B signal-like frequency is fM, then the MUSE signal B
For signal-like components, the modulation index is sufficiently smaller than 1, so the occupied band of the FM signal only needs to be considered in the first sideband, and the lower limit frequency of the FM signal is (fB - fM).
become.

The frequency spectrum of the horizontal burst signal is shown in Part 5). The frequency spectrum of the horizontal burst signal is distributed over fBH (n: a positive integer) around fBH. If the bandwidth of the horizontal burst signal is f'N, the lower and upper frequencies of the horizontal burst signal are [SH-(fN/2), fB
It becomes H+ (fN/2). The frequency spectrum of the horizontal burst signal is selected so as to be distributed between the lower limit frequency that can be recorded and reproduced by the video tape recorder and the frequency (fB-fM). In the figure (d), the output signal of the adder 7,
That is, it shows the frequency spectrum of a signal frequency-multiplexed with the FM-modulated MUSE signal B signal-like burst signal,
This multiplexed signal is amplified by a recording amplifier 8, applied to a head 9 via a switch S1 connected to a terminal R, and recorded on a tape 10.

Next, the operation during playback will be explained.

The multiplexed signal recorded on the tape 10 is reproduced by the head 9, and is applied to the reproduction amplifier 11 via the switch S1 connected to the terminal P, where it is amplified.

The output of the reproducing amplifier 11 is applied to the HPF 12 and BPF 14. The multiplexed signal applied to HPF 12 is
The horizontal burst signal is removed by passing through the PF12. The output signal of this HPF 12 is then applied to an FM demodulator 13, where it is demodulated and converted into a MUSE signal B signal.

On the other hand, the multiplexed signal applied to the BPF 14
14, the horizontal burst signal is extracted, and a reproduced horizontal burst signal having the same waveform jitter as shown in FIG. 3(C) is output. This reproduced horizontal burst signal is applied to a zero cross detector 15 and a gate signal circuit 16. A zero cross detector 15 detects a zero cross of the reproduced horizontal burst signal. FIG. 3(d) shows the zero cross signal which is the output of the zero cross detector 15. The black part is the amplitude of the reproduced horizontal burst signal is zero, and noise from the tape etc. is included.
The detector output during this period is due to noise ranging from L level to H level. The gate signal circuit 16 is
From the input reproduced horizontal burst signal, gate signal e (shown in Fig. 3 te)) gates the zero-crossing point where the reproduced horizontal burst signal changes from negative level to positive level and gates the zero-crossing point where the reproduced horizontal burst signal changes from positive level to negative level. A gate signal f (shown in FIG. 3(f)) is created.

These gate signals are sent to the horizontal gate pulse generation circuit 17.
and shaped into a horizontal gate pulse g that gates the zero-crossing point of the reproduced horizontal burst signal as shown in FIG. 3(g). This horizontal gate pulse signal g is applied to the horizontal synchronization detection circuit 18, and the zero cross point of the zero cross signal d applied from the zero cross detector 15, that is, the zero cross point of the reproduced horizontal burst signal is extracted.

In this way, a reproduced horizontal synchronization signal i indicating the horizontal synchronization signal position of the MUSE signal B signal bar is obtained at the output terminal 19. This is shown in Figure 3 (11).

Next, the clamping operation of the reproduced MUSE signal B will be described.

The gate signal C that gates the zero-crossing point where the reproduced horizontal burst signal changes from negative level to positive level, which is one output of the gate signal circuit 16, and the zero-crossing signal d from the zero-crossing detector 15 are also applied to the clamp pulse generating circuit 20. A clamp pulse h as shown in FIG. 3 is generated. This clamp pulse h and the reproduced MUSE signal B demodulated by the FM? Like, MU
When the polarity of the positive horizontal synchronization signal in SE signal B signal bar diagram (b) changes from low level to high level, it changes from negative level to positive level, and when it changes from high level to low level, it changes from positive level to positive level. Since the level changes from a negative level to a negative level, the clamp pulse h operates to clamp the high level part where the polarity of the MUSE signal B signal bar horizontal synchronization signal changes from a low level to a high level.
MUSE signal in which the E signal is time-compressed B signal Similar to the case of the MUSE signal shown in the bar diagram, the polarity of the horizontal synchronization signal is 6.
Although it is reset at the 07th line, the high level of the horizontal synchronizing signal can always be clamped by the above-mentioned clamp pulse h. At this time, the reproduced MυSE signal B
has jitter, but the jitter at the zero-crossing point of the reproduced horizontal burst signal and the horizontal synchronization signal position of the MUSE signal B signal bar has the same jitter because it is frequency-multiplexed. A predetermined position of the bar horizontal synchronization signal can be clamped. The output of the clamp circuit 21 is connected to an output terminal 22, and a clamped reproduced MUSE signal B is obtained at the output terminal 22.

Next, the operation for extracting the burst signal for pinching out the shifter will be explained.

The reproduced horizontal synchronization signal i which is the output of the horizontal synchronization detection circuit 18
is also added to the burst flag circuit 23, which delays the reproduced horizontal synchronizing signal i and pulse-shapes the burst flag signal j at the timing to extract the burst signal of the reproduced MUSE signal B (shown in FIG. 3 (J)). is created. This burst flag signal j is sent to the burst gate circuit 24.
added to.

The burst gate circuit 24 is supplied with the clamped re-4MUSE signal B which is the output of the clamp circuit 21, and the burst signal k shown in FIG. 3(k) is extracted by the burst flag signal j, and the burst gate circuit circuit 24
It is output to the output terminal 25 of.

In this way, the clamped reproduced MUSE signal B output to the output terminal 22, the reproduced horizontal synchronization signal i output to the output terminal 19, and the burst signal for jitter detection output to the output terminal 25 are The data is sent to the time base collector shown in Figure 2.

The reproduced MUSE signal B is applied to the input terminal 26, and
A/D converter 27 performs A/D conversion. This A/D converted signal is applied to memory 28. Further, the burst signal for shifter detection and the reproduced horizontal synchronizing signal l are applied to input terminals 31 and 32, respectively. Here, the frequency of the burst signal for shifter detection is n7m of the sampling clock of the A/D converter 27 that converts the signal ratio D of the MUSE signal B.
(n, m are positive integers and m > n).

In the write clock circuit 33, these input signals generate a sampling clock for the A/D converter 27 and a write clock for the memory 28, which have a time axis variation in the MUSE signal B signal ratio, which is accompanied by a time axis variation. Therefore, the reproduced MUSE signal B is sampled by the A/D converter 27 using a sampling clock that matches its time axis fluctuation, and the data is transferred to the memory 28 using the write clock.
will be written to. Therefore, the time axis fluctuation has been corrected at the time the data is written to the memory 28. In the read clock circuit 34, a stable read clock is created, and the read clock circuit 34 generates a stable read clock.
The USE signal B signal is converted back to an analog signal by the D/A converter 29. In this way, a time-base stabilized MUSE signal is obtained at the output terminal 30. Note that processing for removing the burst signal for shifter detection inserted in the memory 28 is also performed.

In this way, the time base collector corrects the jitter of the reproduced MUSE signal B, and at the same time removes the burst signal for jitter detection, and the MUSE signal B, which had been time-base compressed, is
Signal B signal ratio horizontal synchronization signal, color signal CI, luminance signal Y1
is expanded on the time axis, and a MUSE signal having the same waveform as that shown in FIG. 3(a) is reproduced.

In this embodiment, since the reproduced horizontal synchronization signal can be detected without inserting a negative horizontal synchronization signal into the MUSE signal, frequency deviation assigned to the negative horizontal synchronization signal level is not required when FM modulating the MUSE signal. Become. Since the deviation of the MUSE signal can be increased accordingly, the S/H can be easily improved without improving the characteristics of the tape head system such as the playback sensitivity of the head.

If the ratio of the negative synchronizing signal level to the video black to white level, which is usually adopted, is 3 near, the S/N can be improved by as much as 3 dB. In addition, since the change in polarity of the positive horizontal synchronization signal of the MUSE signal corresponds to the change in polarity of the horizontal burst signal, even if there is a dropout, as soon as the dropout disappears, the clamp pulse will be created accurately and it will be reliable. The lamp operation can be performed with a simple configuration, and the burst signal for jitter detection can also be extracted reliably with a simple configuration.

Also, since it is recorded in the form of a horizontal burst signal,
The burst frequency can be freely selected, and there is no need to expand the lower limit of the recording and transmission band of a given recording/playback device.
When recording signals of 5K)12) or harmonics in the vicinity thereof, the lower limit recording transmission band must be expanded.

In addition, the recording wavelength of the horizontal burst signal is sufficiently longer than that of the conventional FM-modulated negative horizontal synchronization signal.
A stable playback horizontal synchronization signal that is extremely resistant to dropouts can be obtained.

Next, another embodiment of the present invention will be described with reference to FIG.

When recording the MUSE signal on a video tape recorder,
As is well known, there is a method in which one channel of the MUSE signal is time-expanded in LHH units of 2H, and the signal is divided into two channels and recorded. Figure 6(a) shows the H unit MUSE.
The H unit MUSE signals of Hl, H2゜H3, H4, .
Converted to H2, H3, H4゜..., odd numbered Hl,
8 guns... are on channel A, even numbers H2, H4,
... are rearranged in channel B as shown in the figure (b).Compared to the case of 1-channel recording, by recording 2 channels in this way, the recording band per channel is halved. ing.

FIG. 2C shows the MUSE signal. This MUSE signal is time-expanded to 2H in units of H, and is further compressed in time to insert a burst signal for jitter detection. The MUSE signal, which is divided into two channels with the time compression rate α (0<α×1) and into which a burst signal for jitter detection is inserted, is shown in FIG. y
2 indicates the color signal and luminance signal which have been subjected to the above-mentioned time processing, respectively.

In this case as well, the polarity of the horizontal burst signal is changed to a negative level as shown in FIG. When the polarity of the positive horizontal synchronizing signal changes from a high level to a low level, it changes from a positive level to a negative level. This 2H cycle horizontal burst signal is frequency-multiplexed with the FM-modulated MtJSE signal and recorded.

At the time of playback, the frequency multiplexed signals recorded in these two channels are played back from the respective tapes, and on the same operating principle as in the above embodiment, the playback horizontal synchronization signal of 2H period is detected and clamped in each channel. ,
A burst signal for jitter detection is extracted.

Hereinafter, the jitter of the reproduced MUSE signal which has been time-expanded to 2H by the time base collector provided in each channel is corrected using the same procedure as in the above-mentioned embodiment.
The burst signal inserted MUSE signal which has been time-expanded to 2H of each channel has the burst signal for jitter detection removed, and is further time-compressed to IH and returned to the original 1-channel MUSE signal.

Such an embodiment also provides the same effects as the above embodiment.

In each of the above embodiments, the horizontal burst signal is one cycle, but it may be multiple cycles, and the timing of the horizontal burst signal with respect to the positive horizontal synchronization signal may be arbitrarily selected. , and the same effects as in the above embodiment can be achieved. Further, the insertion position of the burst signal for jitter detection is not limited to the above embodiment.

Further, in each of the above embodiments, a video tape recorder is used as the recording/playback device, but this may be a recording/playback device using magneto-optical recording or optical recording, and the same effects as in the above embodiments can be obtained.

〔Effect of the invention〕

As described above, according to the recording/playback device according to the present invention, M
A horizontal burst signal having the position information of the positive horizontal synchronization signal of the USE signal is frequency-multiplexed with the MUSE signal and recorded on a medium, and during playback, a synchronization signal is created from this horizontal burst signal, and thereby the positive horizontal synchronization signal in the MUSE signal is Since the position of the synchronization signal is detected, the MUSE signal can be easily and reliably clamped without inserting a negative synchronization signal.

It is also possible to perform burst signal position detection, first separation, etc., which has the effect of improving the S/N of the reproduced MUSE signal.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a recording/playback device according to an embodiment of the present invention, FIG. 2 is a block diagram of its time corrector, FIG. 3 is a signal waveform diagram for explaining the operation of the device, and FIG.
The figure shows the polarity of the positive horizontal synchronization signal of the MUSE signal,
FIGS. 5(a) to 5(d) respectively show FM-modulated MUSE signals of a recording/playback device according to an embodiment of the present invention;
A frequency spectrum diagram of a horizontal burst signal and a frequency spectrum diagram when both signals are frequency multiplexed, FIG. 6 is a signal waveform diagram for explaining the operation of another embodiment of the present invention, and FIG. 7 is a diagram of the present application. FIG. 2 is a signal waveform diagram for explaining the operation of a recording/playback device developed by someone else. 3... Burst insertion circuit, 5... FM modulator, 6...
...Horizontal burst signal generator, 7...Adder, 9...
Head, 12... Bypass filter, 14... Band pass filter, 17... Horizontal gate pulse generation circuit, 18... Horizontal synchronization detection circuit, 20... Clamp pulse generation circuit, 21... Clamp circuit, 23...
Burst flag circuit, 24... Burst gate circuit.

Claims (7)

[Claims] (1) MU made by band-compressing high-definition television signals
A recording and playback device that records and plays back SE signals, the input M
MUS that processes signals so that USE signals can be recorded on media
E signal processing circuit and N/H period (N is a positive integer, H is MU
horizontal burst signal generating means for generating a horizontal burst signal (horizontal period of the SE signal); addition means for frequency multiplexing this horizontal burst signal and the output of the MUSE signal processing circuit; and recording both of the frequency multiplexed signals. 1. A recording and reproducing apparatus comprising: recording and reproducing means for reproducing; and a reproducing horizontal burst signal processing circuit that extracts the horizontal burst signal from the reproduced signal and thereby generates a synchronizing signal of N·H period. (2) The MUSE signal processing circuit compresses the input MUSE signal in the time axis for each horizontal period and outputs the compressed MUSE signal.
The recording/playback device according to claim 1, characterized in that the recording/playback device includes a burst insertion circuit for inserting a burst signal for jitter detection into a signal, and an FM modulation circuit for FM modulating the output of the burst insertion circuit. Device. (3) The MUSE signal processing circuit expands the time axis of the input MUSE signal by N times in units of one horizontal period, divides the signal into N channels in units of one horizontal period, and compresses the time axis to obtain the compressed signal. The recording device according to claim 1, characterized in that it includes a burst insertion circuit that inserts a burst signal for jitter detection into the MUSE signal, and an FM modulation circuit that modulates the output of the burst insertion circuit into an FM signal. playback device. (4) The horizontal burst signal generating means includes the MUSE
Recording according to any one of claims 1 to 3, characterized in that it generates a horizontal burst signal with a polarity that has a certain relationship with the polarity of a signal output from a signal processing circuit. playback device. (5) A patent claim characterized in that the reproduced horizontal burst signal processing circuit has a clamp pulse generation circuit that generates a clamp pulse for clamping the reproduced MUSE signal based on a synchronization signal obtained by the circuit. The recording/playback device according to any one of items 1 to 4. (6) The reproduced horizontal burst signal processing circuit has a burst flag circuit that generates a burst flag signal for extracting the burst signal for jitter detection from the reproduced signal based on the synchronization signal obtained by the circuit. A recording/playback device according to any one of claims 2 to 5, characterized in that: (7) The reproduced horizontal burst signal processing circuit has a horizontal synchronization detection circuit that detects the horizontal synchronization signal of the MUSE signal from the zero crossing point of the horizontal burst signal based on the synchronization signal obtained by the circuit. A recording/playback device according to any one of claims 1 to 6, characterized in that: