JPH0787440A - Dubbing system for video signal, reproducing device and recording device and method for controlling them - Google Patents

Abstract

PURPOSE:To implement dubbing processing for a video signal without deteriorating picture quality. CONSTITUTION:A magnetic head 11 of the reproducing device being a component of the dubbing system reads a video signal recorded on a video tape 10, and a luminance signal is subject to processing such as FM demodulation and the resulting signal is given to a synchronizing separator circuit 18 and a slice circuit 30. The synchronizing separator circuit 18 extracts a synchronizing signal C.sync given to an output terminal 5. The slice circuit 30 eliminates the synchronizing signal from the luminance signal Y and the result is given to an output terminal 5. The synchronizing signal C.sync is added to the luminance signal Y at the recorder side of the dubbing system and the result is recorded on the video tape together with the chroma signal.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a video signal dubbing system for reproducing a video signal recorded on a first recording medium and recording it on a second recording medium, a recording device and a reproducing device, and a control method thereof. Regarding

[0002]

2. Description of the Related Art The so-called dubbing process of recording a video signal recorded on a recording medium such as a video tape on another recording medium is performed by reproducing an FM-modulated video signal recorded on the recording medium and reproducing FM modulation. A so-called FM-modulated video signal dubbing in which a video signal is directly output to a recording device without being demodulated and recorded in a recording medium, an FM-modulated video signal recorded in a recording medium is reproduced, and a luminance signal and a color difference signal are generated and recorded. There is so-called color difference signal dubbing in which the data is output to the apparatus and recorded in a recording medium.

In each of these dubbing processes, an analog video signal is input / output between a recording device and a reproducing device, and deterioration of a signal representing a video signal and a sync signal is inevitable. Therefore, the image quality of the reproduced video of the video signal obtained by the dubbing process may be significantly deteriorated as compared with the image quality of the reproduced video of the original video signal. In addition, the saturation and phase of the color signal deteriorate. Further, the synchronization signal may be rounded and the level may be lowered, resulting in loss of synchronization.

[0004]

DISCLOSURE OF THE INVENTION It is an object of the present invention to prevent a video signal from deteriorating even when dubbing is performed.

Another object of the present invention is to prevent the sync signal from being deteriorated by the dubbing process.

A first aspect of the present invention is a reproducing device for reproducing and outputting a video signal recorded therein from the first recording medium, and a second recording medium for inputting the video signal reproduced by the reproducing device. In a dubbing system including a recording device for recording on the recording medium, the reproducing device reads the analog video signal including the synchronization signal recorded on the first recording medium, and the reading device reads the analog video signal. A video signal separating means for separating the sync signal from the analog video signal containing the sync signal and outputting the analog video signal from which the sync signal has been removed, and a sync signal from the analog video signal containing the sync signal read by the reading means. A synchronizing signal which is provided with synchronizing signal separating means for separating and outputting the separated synchronizing signal, wherein the recording device is outputted from the video signal separating means. A combination for inputting the removed analog video signal and the sync signal output from the sync signal separating means, for synthesizing the analog video signal for which the sync signal has been removed and the sync signal, and outputting an analog video signal including the sync signal. Output from the circuit and the above-mentioned synthesis circuit,
A recording means for recording an analog video signal including a synchronization signal on the second recording medium is provided.

The first aspect of the present invention also provides a method of controlling the above dubbing system.

According to the first invention, the analog video signal containing the sync signal is separated into the analog video signal from which the sync signal is removed and the sync signal, and these signals are given to the recording device. An analog video signal including a synchronization signal is generated in the recording device and recorded on a recording medium.

Since the video signal and the sync signal are independent, the waveform of the sync signal can be shaped in the reproducing apparatus or the recording apparatus, and the deterioration of the sync signal due to the dubbing process can be corrected. Therefore, it is possible to prevent the loss of synchronization.

According to a second aspect of the present invention, a reproducing apparatus for reproducing the video signal recorded therein from the first recording medium and a video signal reproduced by this reproducing apparatus are inputted and recorded in the second recording medium. In a dubbing system including a recording device, the reproducing device reads an analog video signal containing a synchronization signal recorded on a first recording medium, and an analog video signal read by the reading device. Is converted into digital image data and output, analog / digital converting means, synchronizing signal separating means for separating a synchronizing signal from the analog video signal read by the reading means, and synchronizing with the synchronizing signal separated by the synchronizing signal separating means Then, the recording apparatus is provided with a pixel clock signal generating means for outputting a pixel clock signal,
The digital image data output from the analog / digital conversion means and the pixel clock signal output from the pixel clock signal generation means are input, and the input digital image data is converted into an analog video signal in synchronization with the input pixel clock signal. And a recording means for recording the analog video signal converted by the digital / analog converting means on the second recording medium.

The second aspect of the present invention also provides a method of controlling the above dubbing system.

According to the first aspect of the invention, the analog video signal read by the reproducing device is converted into digital image data, and the converted digital image data is given to the recording device. Further, a pixel clock signal is generated in synchronization with the synchronization signal, and the generated pixel clock signal is also given to the recording device, and is subjected to digital / analog conversion in synchronization with the pixel clock signal and recorded on the second recording medium. .

Since input / output between the recording device and the reproducing device is performed by digital image data, deterioration of the digital image data does not occur. Therefore, the quality of the image obtained from the analog video signal recorded by the dubbing process does not deteriorate as compared with the original image.

Further, since the synchronization signal is not deteriorated, the loss of synchronization can be prevented.

A pixel clock signal is generated in the reproducing apparatus, and the generated pixel clock signal is given to the recording apparatus and converted into analog in synchronization with the pixel clock signal. An image is obtained.

Also provided are a recording device and a reproducing device which constitute the above-mentioned dubbing system.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention and is a block diagram showing an electrical structure of a reproducing apparatus which constitutes a video signal dubbing system. FIG. 2 is a block diagram showing an electrical configuration of a recording device that constitutes a video signal dubbing system.

Referring to FIG. 1, a video signal Y + S including a synchronizing signal (hereinafter, a luminance signal including the synchronizing signal is represented by Y + S and a luminance signal from which the synchronizing signal is removed is represented by Y) is provided on the video tape 10. It is recorded by FM modulation. Playhead 11
The video signal recorded on the video tape 11 is read by. The reproduced video signal is given to the reproducing / amplifying circuit 12 to be amplified.

The reproduced video signal thus amplified is subjected to a luminance signal Y + in a luminance signal / color signal (Y / C) generation circuit (not shown).
S and the color signal C are generated, and the luminance signal Y + S is given to the FM demodulation circuit 13. The luminance signal Y + S is an FM demodulation circuit 13
The demodulated luminance signal Y + S is applied to the de-emphasis circuit 14.

When the luminance signal Y + S is recorded on the video tape, the luminance signal Y + S is added to improve the SN ratio.
The high frequency component of S is emphasized. The de-emphasis circuit 14 is a circuit that attenuates the high frequency component of the emphasized luminance signal Y + S. The luminance signal Y + S in which the high frequency component is attenuated in the de-emphasis circuit 14 is added to the addition circuit 1
5, applied to the sync separation circuit 18 and the slice circuit 30, respectively.

The color signal C is given to the FM demodulation circuit 16, and F
M demodulated. The demodulated color signal C is given to the de-emphasis circuit 17.

Like the luminance signal Y + S, the color signal C is also recorded with the high frequency component emphasized, so that the high frequency component is attenuated in the de-emphasis circuit 17.

The color signal C in which the high frequency component is attenuated in the de-emphasis circuit 17 is added to the adder circuit 15 and the output terminal 5.
Given to each.

In the adder circuit 15, the luminance signal Y + S and the color signal C are added and output as a video signal.

In the sync separation circuit 18, the hybrid sync signal C.sync including the vertical sync signal VD and the horizontal sync signal HD is separated from the luminance signal Y + S. Hybrid sync signal Cs
ync is given to the output terminal 5 and the signal oscillation circuit (SSG) 19, respectively.

In the signal oscillating circuit 19, only the horizontal synchronizing signal HD is output from the input hybrid synchronizing signal C.sync. The horizontal synchronizing signal HD output from the signal oscillation circuit 19 is given to the clamp circuit 20.

A concrete circuit example of the clamp circuit 20 and the slice circuit 30 is shown in FIG. In Figure 3,
Circuits omitted in FIG. 2 are also shown.

Referring to FIG. 3, clamp circuit 20 includes a power supply Vc. The electric potential Vc of the power source Vc (the electric potential is also represented by the reference symbol Vc) is a clamp electric potential, and the horizontal synchronizing signal HD input to the clamp circuit 20 is fixed to this clamp electric potential Vc.

The horizontal synchronizing signal HD output from the clamp circuit 20 is applied to the slice circuit 30.

The slice circuit 30 includes a power supply Vs. The potential Vs of the power supply Vs (the potential is also represented by the reference symbol Vs) is a slice potential, and the vertical synchronizing signal VD and the horizontal synchronizing signal HD are removed from the input luminance signal in the slice circuit 30 to obtain the synchronizing signal. The luminance signal Y from which is removed is obtained. Luminance signal Y from which the synchronization signal is removed
Is applied to the output terminal 5.

In addition to the color signal C, the mixed synchronizing signal C.sync and the luminance signal Y from which the synchronizing signal is removed are given to the output terminal 5 and output.

Referring to FIG. 2, when the recording apparatus is set to the dubbing mode, CPU 50 outputs dubbing signal DUB as a switch control signal to switch circuits 51 and 54. As a result, the switch circuit 51 and
54, when the dubbing mode is set, the a terminal side becomes conductive. When the dubbing mode is not set, the switch circuits 51 and 54 are both conductive on the terminal b side.

The input terminal 6 of the recording apparatus is supplied with the mixed synchronizing signal C.sync, the luminance signal Y from which the synchronizing signal is removed, and the chrominance signal C.

Hybrid sync signal C.s applied to input terminal 6
ync is given to the CPU 50 and the synchronizing signal adding circuit 40.

When the mixed sync signal C.sync is input to the CPU 50, the dubbing mode is set, the dubbing signal DUB is output from the CPU 50, and the switch circuits 51 and 54 become conductive on the a terminal side. However, an operator may operate the recording device to set the dubbing mode.

The luminance signal Y from which the synchronizing signal given to the input terminal 6 is removed is given to the synchronizing signal adding circuit 40.

FIG. 4 shows a concrete configuration example of the synchronization signal adding circuit 40.
Is shown in.

In the sync signal adding circuit 40, the hybrid sync signal C.s
By providing ync and the luminance signal Y from which the synchronizing signal is removed, the luminance signal Y + S to which the synchronizing signal is added is obtained.

The luminance signal Y + S output from the synchronization signal adding circuit 40 is given to the pre-emphasis circuit 52 via the switch circuit 51, and the high frequency component is emphasized.
Luminance signal Y + S output from the pre-emphasis circuit 52
Is supplied to the modulation circuit 53.

The luminance signal Y + S is supplied to F in the modulation circuit 53.
It is M-modulated and given to the adding circuit 57.

The color signal C applied to the input terminal 6 is input to the pre-emphasis circuit 55 via the switch circuit 54.
In the pre-emphasis circuit 55, the high frequency component of the color signal C is emphasized and given to the modulation circuit 56. The color signal C is FM-modulated in the modulation circuit 56 and given to the addition circuit 57.

In the adder circuit 57, the luminance signal Y + S including the synchronizing signal and the color signal C are added and given to the recording / amplifying circuit 58. This video signal is amplified in the recording / amplifying circuit 58 and given to the magnetic head 59, so that it is recorded on the video tape 61.

In the recording apparatus shown in FIG. 2, a video signal can be input and recorded on the video tape 61.

When a video signal is input to the recording device,
The video signal is supplied to a luminance signal / color signal (Y / C) separation circuit 60. The switch circuits 51 and 54 are both b
The terminal side is brought into conduction. The Y / C separation circuit 60 separates the luminance signal Y + S and the color signal C into a luminance signal Y.
To the pre-emphasis circuit 52, and the color signal C to the pre-emphasis circuit 55.

The subsequent processing is the same as when the mixed synchronizing signal C.sync, the luminance signal Y and the chrominance signal C from which the synchronizing signals have been removed are applied to the input terminal 6, and the description thereof will be omitted.

The reproducing apparatus shown in FIG. 1 and the recording apparatus shown in FIG. 2 constitute a video signal dubbing system.

In this dubbing system, since the sync signal is transmitted and received independently, it is possible to prevent the sync signal from deteriorating more than before. Further, even if the de-emphasis circuit 14 has a rounded waveform or a preshoot, the sync separation circuit 18 can perform waveform shaping.

FIGS. 5 to 7 show another embodiment,
It is a block diagram which shows the electric constitution of the recording / reproducing apparatus of a video signal. A video signal dubbing system can be configured by using two recording / reproducing devices.

The operation of the recording / reproducing apparatus is controlled by the CPU 90.

First, a case where this recording / reproducing apparatus is used on the reproducing apparatus side of a dubbing system will be described.
At this time, the operator sets the dubbing mode, and the CPU 90 outputs a dubbing signal.

Referring to FIG. 5, a switch circuit 72 is used to reproduce the video signal FM-modulated and recorded on the video tape 70.
Is made conductive on the a terminal side.

The video signal recorded on the video tape 70 is read by the magnetic head 71 and given to the reproduction / amplification circuit 73 through the switch circuit 72. The reproduced video signal is amplified in the reproduction amplifier circuit 73 and is given to a luminance signal / color signal separation circuit (not shown) to be separated into a luminance signal Y + S and a color signal C. The luminance signal Y + S including the synchronization signal is FM demodulated in the FM demodulation circuit 74A to be de-emphasis circuit 75.
The high frequency component is attenuated by being given to A. Luminance signal Y + S output from the de-emphasis circuit 75A
Are applied to the a terminal side of the switch circuits 77 and 81, respectively.

When reproducing the video signal recorded on the video tape 70, the terminals a of the switch circuits 77 and 21 are turned on. Therefore, the luminance signal Y + S output from the de-emphasis circuit 74 is analog /
It is applied to digital (A / D) conversion circuit 79 and sync signal separation circuit 82, respectively.

Referring to FIG. 6, a luminance signal Y including a synchronization signal
Only the sync signal of + S is separated in the sync signal separation circuit 82. The vertical synchronizing signal VD of the separated synchronizing signals is applied to the signal oscillation circuit 83 and the image processing integrated circuit 86, respectively. The horizontal synchronizing signal HD is the signal oscillation circuit 8
3, provided to the image processing integrated circuit 86 and the PLL circuit 85, respectively.

The recording / reproducing apparatus also includes a reference oscillating circuit 84, which is a signal 4f having a frequency four times as high as the video signal frequency fsc.
sc is applied to the PLL circuit 85 and the image processing integrated circuit 86, respectively.

The PLL circuit 85 generates and outputs a reference clock signal synchronized with the horizontal synchronizing signal HD from the horizontal synchronizing signal HD given from the synchronizing signal separating circuit 82 and the signal 4fsc having a frequency four times the video signal frequency fsc. It is a circuit to do.
This reference clock signal becomes the pixel clock signal. PL
The reference clock signal output from the L circuit 85 is output terminal 87.
And is output to the outside. Further, the reference clock signal is given to the a terminal side of the signal oscillating circuit 83 and the switch circuit 106.

The signal oscillation circuit 83 inputs the vertical synchronizing signal V
This is a circuit for inputting D, the horizontal synchronizing signal HD and the reference clock signal and generating and outputting various kinds of control signals. This control signal is given to the output terminal 87 and output to the outside. The control signal is given to the a terminal of the switch circuit 117. The control signals include a field / frame discrimination signal ODD / EVEN, a horizontal effective area signal HEN indicating an effective area within one horizontal scanning period, and a vertical effective area signal VEN indicating an effective area in the vertical direction.

The image processing integrated circuit 86 generates and outputs a memory read clock signal for the image memories 101 and 106, which will be described later, and a reproduction synchronizing signal.

Referring again to FIG. 5, the de-emphasis circuit
The brightness signal Y + S output from 75A is applied to the A / D conversion circuit 79 via the switch circuit 77 and converted into digital brightness data. This digital luminance data is given to the output terminal 87 and output to the outside.

The color signal of the reproduced video signal read from the video tape 70 is applied to the FM demodulation circuit 74B.
Demodulated. The FM demodulated color signal is given to the de-emphasis circuit 75B, the high frequency component is attenuated and given to the A / D conversion circuit 80 via the switch circuit 78. A / D
It is converted into digital color data in the conversion circuit 80, given to the output terminal 87, and outputted to the outside.

Next, a case where this recording / reproducing apparatus is used on the recording apparatus side of a dubbing system will be described.

Input terminal for dubbing processing with reference to FIG.
Digital luminance data, digital color data, a reference clock signal and a control signal are applied to 88.

When the recording / reproducing apparatus shown in FIGS. 5 to 7 is used as the recording apparatus side of the dubbing system, the switch circuits 100, 105, 116 and 117 are all in the conductive state on the b terminal side.

Digital luminance data and digital color data applied to the input terminal 88 are applied to the image memories 101 and 106 via the switch circuits 100 and 105, respectively. The reference clock signal is supplied to the image memories 101 and 106 via the switch circuit 106, and digital luminance data and digital color data are stored in the image memories 101 and 106 in synchronization with the reference clock signal.

The control signal applied to the input terminal 88 is applied to the image processing integrated circuit 86 via the switch circuit 107. In the image processing integrated circuit 86, image data processing is performed in accordance with field recording or frame recording and vertical and horizontal effective areas. Further, a memory read clock signal is output from the image processing integrated circuit 86 and applied to the image memories 101 and 106 and the digital / analog (D / A) conversion circuits 102 and 107, respectively.

Image memories 101 and 106 and A / D
When the memory read clock signal is applied to the conversion circuits 102 and 107, the digital brightness data stored in the image memory 101 is read out from the image memory 101 and applied to the D / A conversion circuit 102 to provide an analog brightness signal Y +.
Converted to S. Further, the digital color data stored in the image memory 106 is read from the image memory 106 and the D / A
It is supplied to the conversion circuit 107 and converted into an analog color signal C.

The luminance signal Y + S is the pre-emphasis circuit 10
3 is applied to the FM modulation circuit 104 and the high frequency component is emphasized. The luminance signal Y + S is an FM modulation circuit
In 104, it is FM-modulated and given to the adding circuit 110.

The color signal C is given to the pre-emphasis circuit 108 and subjected to high-frequency component emphasis processing to undergo FM modulation circuit 10.
Given to 9. The color signal C is FM-modulated in the FM modulation circuit 109 and given to the addition circuit 110.

In the adder circuit 110, the luminance signal Y + S and the color signal C are combined, and a recording amplifier circuit 11 is formed as a video signal.
It is given to 1 and amplified.

In the recording / reproducing apparatus, the video tape 70
When the video signal is recorded on the switch circuit 72, the b terminal side of the switch circuit 72 is made conductive. The video signal output from the recording / amplifying circuit 111 is given to the magnetic head 71 via the switch circuit 72 and recorded on the video tape 70.

The luminance signal and color signal output from the D / A conversion circuits 102 and 107 are also given to the encoder 112. Video signal and R at encoder 112
A GB signal is generated and given to the output terminal 113 together with the luminance signal Y and the color signal C. By connecting a monitor display device to the output terminal 113, the video signal recorded on the video tape can be monitored.

When a dubbing system is constructed using the recording / reproducing apparatus shown in FIGS. 5 to 7, a video signal can be converted into digital data and output for dubbing. The digital data can be input and converted into a video signal. Can be recorded on video tape. Therefore, the resolution of the video signal,
It is possible to prevent the deterioration of the SN ratio and prevent the deterioration of the saturation and phase of the color signal. Also, deterioration of the sync signal can be prevented, and dubbing processing can be performed without degrading image quality.

The recording / reproducing apparatus shown in FIGS. 5 to 7 can also reproduce the video signal recorded on the video tape 70 and display it on the monitor display device. In this case, a monitor display device is connected to the output terminal 113.

Referring to FIG. 5, the video signal recorded on the video tape 70 is read by the magnetic head 71, passes through the switch circuit 72, and is amplified in the reproducing / amplifying circuit 73.

The luminance signal of the video signal is the above-mentioned circuit 74.
It is given to the encoder 112 via A, 75A, 77, 79, 100, 101 and 102.

The color signal of the video signal is the above-mentioned circuit 74.
It is given to the encoder 112 via B, 75B, 78, 80, 105, 106 and 107.

A video signal or the like is generated by the encoder 112 and displayed on the monitor display device.

The recording / reproducing apparatus shown in FIGS. 5 to 7 can reproduce a video signal recorded on the video tape 70 to perform dubbing processing, and also can supply a video signal, a luminance signal and a color signal or RGB signals given from an external device. It is also possible to input a signal, convert it into digital data, and output it for dubbing.

In this case, referring to FIG. 5, the signal to be dubbed is applied to input terminal 94 and input to decoder 95. Further, the switch circuits 77, 78 and 81 are made conductive on the terminal b side.

In the decoder 95, a luminance signal Y + S including a sync signal, a color signal C and a sync signal C.sync are generated.

The luminance signal Y + S is given to the A / D conversion circuit 79 via the switch circuit 77 and output from the output terminal 87 as digital luminance data. The color signal C is given to the A / D conversion circuit 80 via the switch circuit 78 and output from the output terminal 87 as digital color data.

The synchronization signal is given to the synchronization signal separation circuit 82 via the switch circuit 81. Then, the reference clock signal is generated using the circuits 84 and 85 and output from the output terminal 87.

By applying the data and signals output from the output terminal 87 to the recording / reproducing apparatus as shown in FIGS. 5 to 7, even an analog video signal can be converted into digital data for dubbing processing. it can.

The recording / reproducing apparatus shown in FIGS. 5 to 7 can also reproduce a video signal or the like externally applied to the input terminal and display it on the monitor display device.

In this case, a video signal or the like is given to the decoder 95 via the input terminal 94. Switch circuit 77 and
78 is on the b terminal side, and switch circuits 100 and 105 are on the a terminal side.

Luminance signal Y + S output from the decoder 95
Is supplied to the encoder 112 via the circuits 77, 79, 100, 101 and 102.

The color signal C output from the decoder 95 is passed through the circuits 78, 80, 105, 106 and 107 to the encoder 112.
Given to.

A video signal is generated in the encoder 112, and is supplied to the monitor display device to be visually displayed.

The recording / reproducing apparatus can also record the video signal applied to the input terminal 94 on the video tape 70. In this case, the b terminal side of the changeover switch 72 is made conductive.

The luminance signal is passed through the circuits 77, 79 and 101 to D /
The luminance signal Y + S given to the A conversion circuit 102 and output from the circuit 102 is added to the addition circuit via the circuits 103 and 104.
Given to 110.

The color signal is given to the D / A conversion circuit 107 through the circuits 78, 80, 105 and 106, and the color signal C output from this circuit 102 passes through the circuits 108 and 109 and the addition circuit 11
Given to 0.

The signal output from the adder circuit 110 is the circuit 11
It is given to the magnetic head 71 via 1 and 72 and recorded on the video tape 70.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention and showing an electrical configuration of a reproducing apparatus which constitutes a dubbing system.

FIG. 2 is a block diagram showing an electrical configuration of a recording apparatus that constitutes a dubbing system.

FIG. 3 shows a specific circuit example of a clamp circuit and a slice circuit.

FIG. 4 shows a specific circuit example of a synchronization signal adding circuit.

FIG. 5 shows another embodiment, showing a part of the electrical configuration of the recording / reproducing apparatus which constitutes the dubbing system.

FIG. 6 shows a part of an electrical configuration of a recording / reproducing apparatus which constitutes a dubbing system.

FIG. 7 shows a part of an electrical configuration of a recording / reproducing apparatus which constitutes a dubbing system.

[Explanation of symbols]

 11, 59 Magnetic head 18 Sync signal separation circuit 20 Clamp circuit 30 Slice circuit 40 Sync signal addition circuit

Claims (12)

[Claims] 1. A reproducing apparatus for reproducing and outputting a video signal recorded therein from a first recording medium, and a recording for inputting a video signal reproduced by this reproducing apparatus and recording it in a second recording medium. In the dubbing system including a device, the reproducing device includes a reading unit that reads an analog video signal including a synchronization signal recorded on a first recording medium, and a synchronization signal that is read by the reading unit. Video signal separating means for separating the sync signal from the analog video signal and outputting the analog video signal from which the sync signal is removed, and separating and separating the sync signal from the analog video signal including the sync signal read by the reading means A sync signal separating means for outputting the sync signal generated by the recording device, wherein the recording device removes the sync signal output from the video signal separating means. Circuit for inputting the synced analog video signal and the sync signal output from the sync signal separation means, and for synthesizing the sync signal-removed analog video signal and the sync signal to output an analog video signal containing the sync signal. And a recording means for recording, on a second recording medium, an analog video signal including a synchronization signal, which is output from the synthesizing circuit, and a video signal dubbing system. 2. A reading means for reading an analog video signal containing a sync signal recorded on a recording medium, a sync signal is separated from an analog video signal containing the sync signal read by the reading means, and the sync signal is removed. A video signal separating means for outputting an analog video signal, and a sync signal separating means for separating the sync signal from the analog video signal including the sync signal read by the reading means and outputting the separated sync signal. Video signal playback device. 3. A synthesizing circuit for inputting a video signal from which a sync signal has been removed and a sync signal for this video signal, synthesizing the video signal and the sync signal and outputting an analog video signal including the sync signal, and A video signal recording apparatus, comprising: a recording unit for recording, on a recording medium, an analog video signal including a synchronization signal, which is output from the synthesizing circuit. 4. A reproducing device for reproducing and outputting a video signal recorded therein from a first recording medium, and a recording for inputting the video signal reproduced by this reproducing device and recording it on a second recording medium. In the dubbing system including the device, the reproducing device reads the analog video signal recorded on the first recording medium, the analog video signal including a synchronization signal, and the analog video signal read by the reading device. Based on the analog / digital converting means for converting into digital image data and outputting, the synchronizing signal separating means for separating the synchronizing signal from the analog video signal read by the reading means, and the synchronizing signal separated by the synchronizing signal separating means. And a pixel clock signal generating means for generating a pixel clock signal. / Digital inputting the digital image data output from the digital converting means and the pixel clock signal output from the pixel clock signal generating means, and converting the input digital image data into an analog video signal in synchronization with the input pixel clock signal / Analog conversion means, and recording means for recording the analog video signal converted by the digital / analog conversion means on a second recording medium, a video signal dubbing system. 5. A reading means for reading an analog video signal containing a synchronization signal recorded on a recording medium, and an analog / digital conversion means for converting the analog video signal read by the reading means into digital image data and outputting the digital image data. A sync signal separating means for separating a sync signal from the analog video signal read by the reading means, and a pixel clock signal generating means for generating a pixel clock signal based on the sync signal separated by the sync signal separating means, A video signal reproducing apparatus having a. 6. Digital / analog conversion means for inputting digital image data representing a moving image and a pixel clock signal of this digital image data, and converting the input digital image data into an analog video signal in synchronization with the input pixel clock signal. And a recording means for recording the analog image signal converted by the digital / analog converting means on a recording medium. 7. A reproducing device for reproducing a video signal recorded therein from a first recording medium, and a recording device for inputting the video signal reproduced by the reproducing device and recording it on a second recording medium. The present invention is applied to a configured dubbing system, and in the above reproducing apparatus, an analog video signal including a sync signal is read from a first recording medium and synchronized from an analog video signal including a sync signal read from the first recording medium. Outputting the analog video signal from which the sync signal has been removed by separating the signal, and separating the sync signal from the analog video signal read from the first recording medium and containing the sync signal to output the sync signal. In the recording device, the analog video signal with the sync signal removed and the analog video signal with the sync signal removed from the playback device are input No. and synthesizes the synchronization signal to obtain an analog video signal including a synchronizing signal, an analog video signal obtained is recorded to the second recording medium, the control method of dubbing system of the video signal. 8. An analog video signal including a sync signal is read from a recording medium, the sync signal is separated from the analog video signal including the sync signal read from the recording medium, and the analog video signal from which the sync signal is removed is output. Then, the sync signal is separated from the analog video signal including the sync signal read from the recording medium, and the separated sync signal is output. 9. A video signal from which a sync signal is removed and a sync signal for the video signal are input, the video signal and the sync signal are combined to obtain an analog video signal including the sync signal, and the analog video signal is obtained. A method for controlling a video signal recording device, wherein an analog video signal including a synchronization signal is recorded on a recording medium. 10. A reproducing apparatus for reproducing a video signal recorded therein from a first recording medium, and a recording apparatus for inputting a video signal reproduced by the reproducing apparatus and recording the same on a second recording medium. It is applied to a configured dubbing system, and in the above reproducing apparatus, an analog video signal including a sync signal is read from the first recording medium, the read analog video signal is converted to digital image data and output, and then read. The sync signal is separated from the analog video signal, the pixel clock signal synchronized with the separated sync signal is generated and output, and in the recording device, the digital image data and the pixel clock signal output from the reproducing device are input, The input digital image data is converted into an analog video signal in synchronization with the input pixel clock signal, and the converted analog Recording the image signal on the second recording medium, the control method of dubbing system of the video signal. 11. An analog video signal including a synchronization signal,
Reading from the recording medium, converting the read analog video signal into digital image data and outputting it, separating the sync signal from the read analog video signal, and generating and outputting the pixel clock signal synchronized with the separated sync signal. A control method of a video signal reproducing device. 12. Digital image data representing a moving image and a pixel clock signal of this digital image data are input, the input digital image data is converted into an analog video signal in synchronization with the input pixel clock signal, and the converted analog image A method for controlling a video signal recording device, which records a signal on a recording medium.