JP2002208234A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device in which a frame synchronizing part is formed without using a voltage control type oscillator circuit, relating to a VTR for recording video signals of one frame on a magnetic tape by distributing them to N-tracks (N is an integer >=1). SOLUTION: A frame reference signal 118 generated on the basis of a vertical synchronous signal of a recording video signal is supplied to a phase comparator 122, and a phase error between the reference signal and a frame pulse 120 is measured, average-processed by an average-processing part 123, divided by the number of tracks in a frame to decide a period in the track. A track counter 124 uses the period in the track as the number of clocks in one track, and outputs a track pulse 121 in each track period. Moreover, every time when a counter 125 presenting a track number reaches the number clocks in one track of the track counter 124, it counts up and the frame pulse 120 is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording an input signal on a magnetic tape and reproducing a signal recorded on the magnetic tape.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus in which a video signal for one frame is divided into N tracks (N is an integer of 1 or more) and recorded on a magnetic recording tape, when a video signal is recorded, a recording video signal is recorded. And generates a frame reference signal, and supplies the frame reference signal to the phase comparator of the frame synchronization means. In the frame synchronization means, a frame pulse is generated by dividing the output of the voltage controlled oscillation circuit, and the voltage controlled oscillation circuit is controlled based on the phase comparison result between the frame pulse and the frame reference signal. As a result, the voltage-controlled oscillation circuit is controlled so that the frame pulse is synchronized with the frame reference signal, and a track pulse in which the frame pulse and the frame pulse period are equally divided by N is generated as a system reference signal. Also, various signal processing is performed using the output of the voltage control type oscillation circuit as an operation clock of the system.

A frequency of a frame reference signal generated based on a vertical synchronizing signal in a video signal such as a component signal or a composite signal input from the outside is detected, and the number of rotations of a rotary head is controlled in accordance with the frequency. A recording / reproducing apparatus for digitally recording a video signal has a configuration including an input / output processing block, a compression / expansion processing block, a recording / reproducing processing block, and a control block for supplying clocks having different frequencies to these processing blocks. It is proposed in Japanese Unexamined Patent Publication No. Hei 7-177469.

FIG. 5 shows a recording / reproducing apparatus according to a conventional embodiment.
2. The recording / reproducing processing block 203 detects a vertical synchronizing signal of a video signal supplied from the outside and detects a frame reference signal 2
04, an input synchronization processing unit 205, a phase comparator 206 that performs a phase comparison using the frame reference signal 204 and the frequency-divided frame pulse 213 as inputs, and performs an averaging process using the output of the phase comparator 206 as an input to generate an error signal 207. The averaging processing unit 208 that outputs the error signal
Voltage controlled oscillation circuit 20 for generating 8 MHz clock
It is composed of a frequency dividing counter 210 that divides the frequency of a 9 or 18 MHz clock and outputs a frequency divided frame pulse 213.

The operation of the conventional recording / reproducing apparatus configured as described above will be described below with reference to the drawings.

When recording a video signal, the input synchronization processing unit 20
5 detects a vertical synchronizing signal of a video signal supplied from the outside, generates a frame reference signal 204, and
06, the frame reference signal 204 and the divided frame pulse 2
13 are compared. The output of the phase comparator 206 is subjected to averaging processing by an averaging processing unit 208 to output an error signal 207. The error signal 207 controls the voltage-controlled oscillation circuit 209, and the frequency-divided frame pulse 213 is converted to the frame reference signal 204. The voltage controlled oscillation circuit 209 is controlled so as to be synchronized, and the output clock of the voltage controlled oscillation circuit 209 is used as the operation clock of the frequency dividing counter 210 and the compression / decompression processing block 202. The frequency division counter 210 is a counter that counts the output clock of the voltage control type oscillation circuit 209, and by decoding this, generates a frequency division frame pulse 213 and a frequency division track pulse 211 obtained by dividing the frame length by the number of tracks at equal intervals. , The divided frame pulse 213 and the divided track pulse 211 are used as reference signals for the system.

In the input / output processing block 201, 13.5 is used.
A video signal supplied from the outside is converted into a digital signal based on the MHz clock, and a digital luminance signal and a digital chrominance signal are formed. Compression / decompression processing block 20
2, the digital luminance signal and the digital chrominance signal are divided into blocks each having a predetermined number of pixels based on 18 MHz.
DCT (discrete cosine transform), quantization, and variable length encoding are performed, and the resultant is supplied to the recording / reproducing processing block 203. The 43 MHz clock that is the operation clock of the recording / reproducing processing block 203 is generated based on the 18 MHz clock.
Based on the clock of Hz, a modulation process is performed by adding an error correction code, and is supplied to the recording head 212 and recorded on a recording medium. By controlling the number of rotations of the recording head 212 based on the frequency-divided track pulse 211, the number of rotations can be varied according to the frequency of a vertical synchronization signal of a video signal supplied from the outside. As a result, video data is obliquely recorded on the magnetic tape.

[0008]

The conventional recording / reproducing apparatus is configured as described above. The voltage-controlled oscillation circuit changes the frequency of the system operation clock to synchronize with the vertical synchronizing signal of the recording video signal. It is carried out.

However, in the above-mentioned recording / reproducing apparatus, since the frequency of the operation clock of the system is changed by the voltage-controlled oscillation circuit, when the phase difference between the frame reference signal and the frame pulse is large, the clock frequency fluctuates greatly and the system becomes inoperable. There was a problem of becoming stable. In addition, in order to stabilize the system of the recording / reproducing apparatus by appropriately setting the characteristics of the frame synchronization means, it is necessary to select the upper and lower limits of the clock frequency oscillated by the voltage-controlled oscillation circuit to appropriate values. There has been a problem that the oscillation range changes due to variations in the characteristics of the constituent boards and components. further,
The voltage-controlled oscillation circuit generally has a problem that it is very susceptible to noise with respect to the control voltage and fluctuations in the power supply voltage, and has been particularly sensitive in constructing a system.

The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a recording / reproducing apparatus having a frame synchronizing means without using a voltage-controlled oscillation circuit. .

[0011]

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention converts a one-frame video signal into N frames.
What is claimed is: 1. A recording / reproducing apparatus for dividing a track (N is an integer equal to or greater than 1) into a recording medium and detecting the frame reference of a recording video signal and outputting a frame reference signal; A phase comparator that measures a phase shift between a reference signal and a frame pulse and outputs a phase error, an averaging unit that averages and outputs an output of the phase comparator, and an output of the averaging unit as an input. Calculating means for dividing the output into N equal parts, adding means for inputting an output of the calculating means as an input and adding a fixed value, an in-track clock number counter for counting the output of the adding means as a track period, and an in-track clock number A track number counter that counts up for each track cycle of the counter and resets for each upper limit of the number of tracks to count the number of tracks in one frame; Frame pulse output means for decoding the clock number counter in the track and the track number counter and outputting the frame pulse phase-locked to the frame reference signal; and the period of the frame pulse by decoding the clock number counter in the track To N
Track pulse output means for outputting a track pulse divided equally, and recording means for operating based on the frame pulse and the track pulse to record the recording video signal on a recording medium.

With such a configuration, it is possible to provide a recording / reproducing apparatus in which a frame synchronizing means is formed without using a voltage control type oscillation circuit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a recording / reproducing apparatus for dividing a video signal of one frame into N tracks (N is an integer of 1 or more) and recording the divided video signal on a recording medium. A frame reference signal generating means for detecting a frame reference of a recording video signal and outputting a frame reference signal; a phase comparator for measuring a phase shift between the frame reference signal and a frame pulse to output a phase error; Averaging means for averaging the output of the comparator as an input and outputting the result, calculating means for receiving the output of the averaging means as an input and dividing the output into N equal parts, and adding an output of the calculating means as an input and adding a fixed value An adding means, an intra-track clock number counter that counts the output of the adding means as a track cycle, and a track number that is counted up for each track cycle of the intra-track clock number counter. A track number counter that counts the number of tracks in one frame by resetting for each upper limit; a frame pulse that decodes the clock number counter in the track and the track number counter and outputs the frame pulse phase-locked to the frame reference signal An output unit, a track pulse output unit for decoding the clock counter in the track and outputting a track pulse obtained by dividing the cycle of the frame pulse by N, and operating the recording based on the frame pulse and the track pulse. A recording means for recording a video signal on a recording medium, whereby a frame synchronizing means can be configured without using a voltage-controlled oscillation circuit. Is divided into N tracks (N is an integer of 1 or more) and recorded on the magnetic tape. The VTR to be realized.

[0014] The invention described in claim 2 of the present invention provides:
The recording means outputs an in-track processing completion signal notifying that the processing in the track is completed, and starts clock supply to the recording means on the basis of a track pulse. And clock supply means for stopping the supply of the clock, whereby the clock can be supplied only to the operating range of the recording means, so that the video signal of one frame can be supplied to the N track without increasing the power consumption. (N is an integer of 1 or more) to realize a VTR that records data on a magnetic tape.

The invention according to claim 3 of the present invention provides:
A mode setting unit for instructing a recording operation or a reproducing operation, and when the mode setting unit instructs a reproducing operation, operates based on a frame pulse and a track pulse to reproduce data from a recording medium and output a video signal. A video signal output means for switching the output of the reproduction means and a recorded video signal by the mode setting means and outputting the output. The arithmetic means when the instruction of the mode setting means indicates a reproduction operation. And the frame pulse and the track pulse are output at a fixed period and in a continuous phase with the recording operation, whereby the mode setting means for instructing the recording operation or the reproducing operation can perform the recording operation. When the instruction changes from the operation to the reproduction operation, the frame pulse for synchronizing the frame of the device Therefore, the continuity of the synchronizing signal of the output video signal output from the video signal output means is maintained, and therefore, when the video signal to be displayed on the monitor is switched from the recorded image to the reproduced image, the screen is prevented from being disturbed. Can be.

[0016] The invention described in claim 4 of the present invention provides:
An input frame cycle measuring unit that measures the cycle of the frame reference signal and outputs an input frame cycle, and a comparison unit that determines whether the input frame cycle is within a predetermined range and outputs a frame cycle determination result, A selector that outputs a fixed value when the frame cycle determination result indicates outside the predetermined range and outputs an output of the arithmetic means when the frame cycle determination result indicates that the frame period is within the predetermined range; and the adding means adds the fixed value to the output of the selector. And a storage unit having a capacity of one frame of the recording video signal, writing the recording video signal in the storage unit, reading and outputting the recording video signal from the storage unit based on the frame pulse, and The data read from the storage means is recorded as an input on a recording medium, and when the frame period of the recording video signal exceeds a predetermined range, The can output of the averaging means is limited up to the upper limit or lower limit, limiting the variable range of the frame pulse and the track pulse period. As a result, the fluctuation range of the reference signal of the system can be limited, so that the stability of the system can be ensured.

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

(Embodiment 1) FIG. 1 is a block diagram of a recording / reproducing apparatus having a basic configuration according to Embodiment 1 of the present invention. The first embodiment corresponds to the first to second and third aspects of the present invention.

In FIG. 1, reference numeral 101 denotes a mode setting unit which is mode setting means for instructing a recording operation or a reproducing operation;
102 is a recording video signal input unit, 103 is a recording unit which is a recording means for processing the recording video signal input from the recording video signal input unit 102 and records it on a magnetic tape which is a recording medium, and 104 is a recording unit which is recorded on a magnetic tape. The reproducing unit 105 is a reproducing unit that reproduces the reproduced data by the reproducing head 131 and outputs a reproduced video signal. 105 is a clock control unit that is a clock control unit that supplies a clock to each block. 106 is a unit that generates an operation reference of the apparatus. A frame synchronizing unit 107 is a video signal output unit for outputting a video signal from the recording video signal input unit 102 or the reproducing unit 104 to the outside.

When recording a video signal supplied from the outside in such a recording / reproducing apparatus, the recorded video signal 108 is supplied to the recording unit 103. The recording unit 103
Input synchronization processing section 109, input video signal processing section 110, shuffle section 111, compression section 112, error correction code adding section 1
13, a modulation unit 114, a recording signal generation unit 115, a recording head 116, and a mechanical control unit 117.

The input synchronizing section 109 controls the recording video signal 10
8 as an input, performs sync separation processing and sync signal detection, and outputs a frame reference signal 118 and a horizontal sync signal 119. The frame reference signal 118 is supplied to the frame synchronization section 106 and is supplied with a frame pulse 120 and a track pulse 121.
Is output.

FIG. 2 shows the internal configuration of the frame synchronization section 106. That is, to explain each block and its operation, the frame reference signal 118 detected by the input synchronization processing unit 109 is supplied to the phase comparator 122,
The phase error with the frame pulse 120 is measured. The phase error measured by the phase comparator 122 is averaged by the averaging unit 12.
3 and performs an averaging process, divides by the number of tracks in the frame, and outputs the in-track period.

The period within the track is determined by the track counter 124.
, And uses the intra-track period as the number of clocks in one track.
Outputs 1. Further, a counter 1 indicating a track number
Each time 25 reaches the number of clocks in one track of the track counter 124, the count is incremented.

A track counter 124 and a counter 125 indicating a track number constitute a frame counter. The frame counter is decoded to output a frame pulse 120.

The shuffle section 111, compression section 112,
The error correction code addition unit 113, the modulation unit 114, and the mechanical control unit 117 receive the frame pulse 120 and the track pulse 121, and use them as a reference for the operation of each block.
That is, the recording video signal 108 is input to the input video signal processing unit 1.
A / D conversion is performed at 10 to form a digital luminance signal and a digital chrominance signal. The digital luminance signal and the digital chrominance signal are supplied to the shuffle section 111 and the frame reference signal 11
8 and the horizontal synchronizing signal 119 are written in the shuffling memory.

The shuffle unit 111 performs a read process from the shuffling memory 132 based on the frame pulse 120 and the track pulse 121 while performing a rearrangement process for each block of 8 pixels × 8 pixels. The data read from the shuffling memory 132 is transmitted to the compression unit 11
In 2, DCT transformation, quantization and variable length coding are performed, an error correction code adding section 113 adds an error correction code, and a modulation section 114 performs modulation processing.

The mechanical control unit 117 controls the frame pulse 12
The recording head 116 is tracked by rotating the rotary drum in synchronization with 0 and the track pulse 121, and is recorded on the magnetic tape via the recording head 116.
The operation clocks of the shuffle unit 111, the compression unit 112, and the error correction code addition unit 113 are supplied from the clock control unit 105, respectively, and start to be supplied when the track pulse 121 becomes active. Is output to When receiving the processing completion signal, the clock control unit 105 stops the clock supplied to the corresponding block.

As described above, the clock supplied to each block is intermittently stopped so that the power consumption does not increase.

On the other hand, when a reproduction operation is instructed by the mode setting unit 101, the in-track period output from the averaging unit 123 outputs a fixed value.

As a result, the frame pulse 120 and the track pulse 121 have the same continuous phase as in the recording operation. The reproducing unit 104 operates on the basis of the frame pulse 120 and the track pulse 121, performs a reproducing process on the data recorded on the magnetic tape, and outputs a reproduced video signal 126.

The video signal output unit 107 is a mode setting unit 10
1, when the recording operation is instructed, the recording video signal 10
8 is output, and when the instruction from the mode setting unit 101 is a playback operation, a playback video signal 126 is output. Playback video signal 1
Since the frame pulse 120 and the track pulse 121, which are the operation reference of the reproducing unit 104 that outputs the signal 26, have the same phase as that during the recording operation, the continuity of the synchronization signal of the video signal output from the video signal output unit 107 is maintained. Therefore, when the video signal projected on the monitor is switched from the recorded video signal 108 to the reproduced video signal 126, it is possible to prevent the screen from being disturbed.

Embodiment 2 Hereinafter, Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram of a recording / reproducing apparatus having a basic configuration according to the second embodiment of the present invention. The second embodiment corresponds to the fourth aspect of the present invention.

The recording / reproducing apparatus shown in FIG. 3 processes a recording video signal input from a mode setting unit 101 for instructing a recording operation or a reproducing operation, a recording video signal input unit 102, and a recording video signal input unit 102, and performs magnetic processing. A recording unit 103 for recording on a tape; and a reproducing unit 10 for reproducing data recorded on a magnetic tape by a reproducing head 131 and outputting a reproduced video signal
4, a clock control unit 105 that supplies a clock to each block, and a frame synchronization unit 1 that generates an operation reference of the device.
06, a video signal output unit 107, and a memory 127 as storage means for storing a capacity of one frame of the video signal.

When recording a video signal supplied from the outside in such a recording / reproducing apparatus, the recorded video signal 108 is supplied to the recording unit 103. The recording unit 103 includes an input synchronization processing unit 109, an input video signal processing unit 110, a shuffle unit 111, a compression unit 112, and an error correction code adding unit 11.
3, a modulation unit 114, a recording signal generation unit 115, a recording head 116, and a mechanical control unit 117.

The input synchronizing processing unit 109 outputs the recording video signal 10
8 as an input, performs sync separation processing and sync signal detection, and outputs a frame reference signal 118 and a horizontal sync signal 119. The frame reference signal 118 is supplied to the frame synchronization section 106 and is supplied with a frame pulse 120 and a track pulse 121.
Is output.

FIG. 4 shows the internal configuration of the frame synchronization section 106. That is, the blocks and the operation will be described. The frame reference signal 118 detected by the input synchronization processing unit 109 is input frame period measurement unit 128
After measuring the input frame period supplied to the
It is determined whether it is within 1% and the frame cycle determination result 12
9 is output.

The frame reference signal 118 is also supplied to a phase comparator 122, and a phase error from the frame pulse 120 is measured. When the frame cycle determination result 129 is ± 1% or more, the averaging processing unit 123 outputs a fixed value as the in-track cycle, and outputs the frame cycle determination result 129 as ± 1.
If the difference is within%, the phase error measured by the phase comparator 122 is averaged, divided by the number of tracks in the frame, and output as an in-track period.

The period within the track is determined by the track counter 124.
, And uses the intra-track period as the number of clocks in one track.
Outputs 1. Further, a counter 1 indicating a track number
Each time 25 reaches the number of clocks in one track of the track counter 124, the count is incremented. Then, the track counter 124 and the counter 12 indicating the track number
5 constitutes a frame counter, and the frame pulse is output by decoding the frame counter.

The shuffle section 111, the compression section 112,
The error correction code addition unit 113, the modulation unit 114, and the mechanical control unit 117 receive the frame pulse 120 and the track pulse 121, and use them as a reference for the operation of each block.
That is, the recording video signal 108 is input to the input video signal processing unit 1.
A / D conversion is performed at 10 to form a digital luminance signal and a digital chrominance signal.

The digital luminance signal and digital chrominance signal are supplied to the memory 127, and are written into the memory 127 based on the frame reference signal 118 and the horizontal synchronization signal 119. The shuffle unit 111 reads out a digital luminance signal and a digital chrominance signal from the memory 127 based on the frame pulse 120 and the track pulse 121, writes the read digital luminance signal and the digital chrominance signal into the shuffling memory 132, and performs rearrangement processing for each block of 8 × 8 pixels. , The frame pulse 120 and the track pulse 12 from the shuffling memory 132.
Read processing is performed on the basis of 1.

The data read from the shuffling memory 132 is subjected to DCT conversion, quantization and variable length coding by the compression unit 112, and an error correction code addition unit 113 adds an error correction code to the data, Performs modulation processing. The mechanical control unit 117 rotates the rotating drum in synchronization with the frame pulse 120 and the track pulse 121 to adjust the tracking of the recording head 116, and is recorded on the magnetic tape via the recording head 116.

As described above, by configuring the frame synchronization unit, the frame reference signal 1
18 are within ± 1%, the phase comparator 122
The frame pulse 120 is locked to the frame reference signal 118 so that the output becomes zero, the digital luminance signal and the digital chrominance signal are delayed by a predetermined time in the memory 127, supplied to the recording unit 103, and recorded on the magnetic tape.

When the deviation of the frame reference signal 118 of the recording video signal 108 is ± 1% or more, the output of the averaging section 123 becomes a fixed value, so that the frame pulse 12
The variable range of the cycle of 0 and the track pulse 121 can be limited. As a result, the fluctuation range of the reference signal of the system can be limited, so that the stability of the system can be ensured.

Further, the deviation of the frame reference signal 118 of the recording video signal 108 from within ± 1% to ± 1% or more, and the frame pulse 120 and the track pulse 121
Even if the generation method is switched from external synchronization to self-running, the frame pulse 120 and the track pulse 121, which are the reference signals of the system, can be continuously generated in the same phase, so that the stability of the system can be secured.

[0046]

As described above, according to the present invention, a frame synchronizing unit can be formed without using a voltage-controlled oscillation circuit, and a video signal of one frame is divided into N tracks (N is an integer of 1 or more). Thus, there is an effect that a VTR for recording on a magnetic tape can be realized.

Further, since it is possible to supply a clock only in the operation range of the recording unit, a video signal of one frame is divided into N tracks (N is an integer of 1 or more) without increasing power consumption, and the divided signals are recorded on a magnetic tape. There is an effect that a VTR for recording can be realized.

Further, when the mode setting unit for instructing the recording operation or the reproducing operation changes the instruction from the recording operation to the reproducing operation, the frame pulse for synchronizing the frame of the apparatus has the same phase as that of the recording operation. The continuity of the synchronizing signal of the output video signal output from the video signal output unit is maintained, so that the screen can be prevented from being disturbed when the video signal to be displayed on the monitor is switched from a recorded image to a reproduced image. There is.

When the frame period of the recording video signal exceeds a predetermined range, the output of the averaging unit is limited to the upper limit or the lower limit, and the variable range of the frame pulse and track pulse periods may be limited. There is an effect that can be done. As a result, the fluctuation range of the reference signal of the system can be limited, and thus there is an effect that the stability of the system can be ensured.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an internal configuration of a frame synchronization unit according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a block diagram of an internal configuration of a frame synchronization unit according to a second embodiment of the present invention;

FIG. 5 is a block diagram showing a configuration of a conventional recording / reproducing apparatus.

[Explanation of symbols]

 101 Mode setting section 102 Recorded video signal input section 103 Recording section 104 Playback section 105 Clock control section 106 Frame synchronization section 107 Video signal output section 108 Recorded video signal 109 Input synchronization processing section 110 Input video signal processing section 111 Shuffle section 112 Compression section 113 Error correction code adding unit 114 Modulation unit 115 Recording signal generation unit 116 Recording head 117 Mechanical control unit 118 Frame reference signal 119 Horizontal synchronization signal 120 Frame pulse 121 Track pulse 122 Phase comparator 123 Averaging processing unit 124 Track counter 125 Track Counter 126 indicating the number 126 Playback video signal 127 Memory 128 Input frame period measurement unit 129 Frame period determination result

Claims (4)

[Claims] 1. A video signal of one frame is transmitted to N tracks (N
A frame reference signal generating means for detecting a frame reference of a recorded video signal and outputting a frame reference signal; A phase comparator for measuring a phase shift of a frame pulse and outputting a phase error; an averaging means for averaging and outputting the output of the phase comparator as an input; Calculating means for inputting and outputting the output of the calculating means as an input, adding a fixed value, an in-track clock number counter for counting the output of the adding means as a track period, and a track of the in-track clock number counter. A track counter for counting the number of tracks in one frame by counting up for each cycle and resetting for each upper limit of the number of tracks; Frame pulse output means for decoding the clock number counter and the track number counter and outputting the frame pulse phase-locked to the frame reference signal; and decoding the clock number counter in the track to set the period of the frame pulse to N or the like. A recording / reproducing apparatus comprising: a track pulse output unit that outputs a divided track pulse; and a recording unit that operates based on the frame pulse and the track pulse to record the recording video signal on a recording medium. 2. The recording means outputs an in-track processing completion signal for notifying that the processing in the track has been completed, and starts supplying a clock to the recording means on the basis of a track pulse. 2. The recording / reproducing apparatus according to claim 1, further comprising clock supply means for stopping supply of the clock to the recording means. 3. A mode setting means for instructing a recording operation or a reproducing operation, wherein when the mode setting means instructs a reproducing operation, data is reproduced from a recording medium by operating based on a frame pulse and a track pulse. And a video signal output means for switching and outputting the output of the reproduction means and the recorded video signal by the mode setting means, wherein an instruction of the mode setting means instructs a reproduction operation. 3. The recording / reproducing apparatus according to claim 2, wherein in such a case, the frame pulse and the track pulse are output at a fixed period and in a continuous phase with the recording operation by setting the output of the arithmetic unit to a fixed value. 4. An input frame period measuring means for measuring a period of a frame reference signal and outputting an input frame period,
A comparison unit that determines whether the input frame period is within a predetermined range and outputs a frame period determination result, and outputs a fixed value when the frame period determination result indicates outside the predetermined range, and outputs a fixed value within the predetermined range. In the case shown, the selector that outputs the output of the arithmetic unit, and the adding unit adds a fixed value to the output of the selector, and includes a storage unit having a capacity of one frame of the recording video signal, 3. The method according to claim 2, wherein a signal is written in said storage means, read out from said storage means on the basis of said frame pulse and output, and said recording means records the data read out from said storage means as an input and records it on a recording medium. The recording / reproducing apparatus as described in the above.