KR100191207B1 - Apparatus for recording and playing image signal - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

A technique of recording and reproducing a synchronization signal from a video signal when recording a video signal captured by a camera or reproducing the recorded video signal.

2. Technical problem to be solved by the invention

The video signal is recorded and reproduced by extracting the sync signal from the video signal without a separate sync signal generator.

3. Summary of Solution to Invention

In recording and reproducing a video signal, a sync signal is separated from a video signal output from a camera, and a vertical sync signal of the separated sync signals is used as a start address and an end address for recording, and a complex sync signal or a horizontal sync signal is used. Using the sampling clock signal, analog video signal is converted into digital signal and recorded, and during playback, the camera is driven to separate the sync signal from the video signal output from the camera, and the vertical sync function signal, horizontal sync signal, and composite The digital video signal recorded using the synchronization signal is read out to convert and reproduce the analog signal.

4. Important uses of the invention

Video signal recording and playback device.

Description

Video signal recording and playback device

1 is a block diagram of a conventional video signal and playback apparatus.

2 is a block diagram of a video signal recording and reproducing apparatus according to the present invention.

Figure 3 is a waveform diagram of each part operation according to the present invention.

The present invention relates to a video signal recording and reproducing apparatus, and more particularly, to a video signal recording and reproducing apparatus for recording and reproducing a sync signal from a video signal when recording or reproducing a video signal photographed from a camera. It is about.

In general, an image signal processing apparatus requires a synchronization signal in order to convert and record an image signal input from a camera, convert the digital signal, and reproduce the recorded signal on a monitor.

1 is a block diagram of a conventional video signal recording and reproducing apparatus, wherein the controller 10 generates an address and a chip select signal, an A / D enable, and a D / A enable signal, respectively, for recording and reproducing the video signal. It controls the recording and playback of the video signal by receiving the composite sync signal (C-Sync), horizontal sync signal (H-Sync), vertical sync signal (V-Sync), and field signals. The switching circuit 14 is a video signal captured by the camera according to the selection of the recording / playback signal (REC / PLAY SIGNAL) from the control unit 10 or a playback image converted into analog from the D / A converter 18. Select and switch the signal. At this time, when a recording (REC) signal is applied from the control unit 10 to the switching circuit 14, the switching circuit 14 selects an image signal output from the camera, thereby converting the A / D converter 16 and the synchronization signal separator 20. Is applied. The synchronizing signal separator 20 separates the synchronizing signal from the video signal and applies it to the sampling clock of the A / D converter 16. At the same time, the synchronizing signal (C-Sync) and the horizontal synchronizing signal are supplied to the control unit 10. (V-Sync), vertical sync signal (H-Sync) is applied. The D / A converter 16 receives the video signal and converts the digital video signal to a memory 12 by using a sampling clock signal applied from the synchronization signal separator 20. At this time, the controller 10 supplies an address to the memory 12 to record the digital video signal in the memory 12.

As described above, the operation of reproducing the image signal recorded in the memory 12 after recording the image signal, the synchronization signal generator 28 is a composite synchronization signal (C-Sync), horizontal synchronization signal (V-Sync), vertical synchronization A signal (H-Sync) is generated and applied to the control unit 10 and provided to the D / A converter 18 as a sampling clock signal. Then, the controller 10 applies an address to the memory 12 to read the digital video signal recorded and to apply it to the D / A converter 18. As a result, the D / A converter 18 converts the read digital video signal into an analog video signal by the sampling clock signal and outputs the analog video signal to the switching circuit 14. At this time, the switching circuit 14 outputs the analog video signal changed from the D / A converter 18 to the video output terminal VIEDO OUT to display on the monitor.

Such a conventional video signal recording and reproducing apparatus separates the synchronous signal from the input video signal during recording, thereby sampling sampling, complex synchronous signal (C-Sync), horizontal synchronous signal (V-Sync), and vertical synchronous signal (H-). Sync), so there is no problem, but at the time of reproduction, since the synchronization signal is generated by using a separate synchronization signal generator 18, the video signal is reproduced by the generated synchronization signal, which complicates the circuit configuration and generates the image according to high frequency generation. There was a problem that interferes with the signal.

Accordingly, an object of the present invention is to provide an apparatus for recording and reproducing a video signal by extracting the sync signal from the video signal without a separate sync signal generator to solve the above problems.

The present invention for achieving the above object, in the recording and playback of the video signal, by separating the synchronization signal from the video signal output from the camera to use the vertical synchronization signal of the separated synchronization signal as the start address and end address for recording The analog video signal is converted into a digital signal and recorded using a composite synchronization signal or a horizontal synchronization signal as a sampling clock signal, and the synchronization signal is separated from the image signal output from the camera by driving the camera during playback. The digital video signal recorded using the vertical synchronizing signal, the horizontal synchronizing signal, and the composite synchronizing signal is read out, and converted into an analog signal for reproduction.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a video signal recording and reproducing apparatus according to the present invention, wherein the control unit 10 provides an address and chip select signal, an A / D enable, and a D / A enable signal for recording and reproducing the video signal. Each of them is generated and controls the recording and reproducing of the video signal by receiving the composite synchronization signal (C-Sync), the horizontal synchronization signal (H-Sync), the vertical synchronization signal (V-Sync), and the field signal. The memory 12 records the video signal by the control signal of the controller 10. The switching circuit 14 is a video signal captured by the camera according to the selection of the recording / playback signal (REC / PLAY SIGNAL) from the control unit 10 or a playback image converted into analog from the D / A converter 18. Select and switch the signal. The synchronizing signal separator 20 separates the composite synchronizing signal, the vertical synchronizing signal, the horizontal synchronizing signal, the field signal, and the like from the image signal input from the camera. The sampling clock generator 22 generates a sampling clock fs in synchronization with the composite synchronization signal or the horizontal synchronization signal separated from the synchronization signal separation unit 20 to convert the A / D converter 16 and the D / A conversion. Output to section 18. The address generator 24 receives the sampling clock signal, increases the address, supplies the address to the controller 10, generates an address start signal, and applies it to the valid image data detector 26. The valid video signal detector 26 receives the address start signal and detects the start and end of the valid video signal and applies it to the controller 10. The A / D converter 16 converts the analog signal in the effective video signal area into a digital video signal in accordance with the sampling clock. The D / A converter 18 converts the analog video signal from the digital video signal read out from the memory 12 under the control of the controller 10 by the sampling clock signal.

3 is an operation waveform diagram of each part according to the present invention.

One preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3 described above.

The controller 10 generates an address, a chip select signal, an A / D enable signal, and a D / A enable signal for recording and reproducing the video signal, respectively, and the composite synchronization signal (C-Sync) and the horizontal synchronization signal (H−). Sync), V-Sync, and field signals to control recording and playback of video signals. The synchronizing signal separator 20 separates the synchronizing signal from the video signal and applies it to the sampling clock of the A / D converter 16. At the same time, the synchronizing signal (C-Sync) and the horizontal synchronizing signal are supplied to the control unit 10. The V-Sync, H-Sync and FIELD signals are applied to the sampling clock generator 22. The sampling clock generator 22 generates the sampling clock fs as shown in FIG. 3 in synchronization with the horizontal synchronous signal as shown in FIG. 32 separated from the sync signal separator 20 to generate the A / D converter. And output to the D / A converter 18. At this time, the address generator 24 receives the sampling clock signal, increases the address, supplies it to the controller 10, generates an address start signal, and applies it to the effective video signal detector 26. The valid video signal detector 26 receives the address start signal and senses the start and end of the valid video signal as shown in FIG. 31 and applies it to the controller 10.

Then, the switching circuit 14 is a video signal output from the camera according to the selection of the recording / playback signal (REC / PLAY SIGNAL) from the control unit 10 or the playback video signal converted to analog from the D / A converter 18 Select to switch. At this time, when a recording (REC) signal is applied from the control unit 10 to the switching circuit 14, the switching circuit 14 selects an image signal output from the camera, thereby converting the A / D converter 16 and the synchronization signal separator 20. Is applied. The A / D converter 16 receives the video signal, converts the video signal into a digital video signal by using the sampling clock signal generated by the sampling clock generator 22, and applies it to the memory 12. At this time, the controller 10 supplies an address to the memory 12 to record the digital video signal in the memory 12.

As described above, when the video signal is recorded and the video signal recorded in the memory 12 is reproduced, the sampling clock generator 22 generates the sampling clock signal and provides it to the D / A converter 18. Then, the controller 10 receives the address generated from the address generator 24, applies the address to the memory 12, reads out the recorded digital video signal, and applies it to the D / A converter 18. FIG. As a result, the D / A converter 18 converts the read digital video signal into an analog video signal by the sampling clock signal and outputs the analog video signal to the switching circuit 14. At this time, the switching circuit 14 outputs the analog video signal converted from the D / A converter 18 to the video output terminal VIEDO OUT to display on the monitor.

As described above, the present invention separates the synchronous signal from the video signal output from the camera and is used when recording or reproducing the video data, thereby eliminating the use of a separate synchronous signal generating circuit, thereby simplifying the circuit and causing the synchronous signal to be generated. There is an advantage to reduce the interference of high frequency.

Claims (1)

A video signal recording and reproducing apparatus having a memory for recording a video signal, comprising: generating address and chip select signals, A / D enable signals, and D / A enable signals, respectively, for recording and reproducing video signals, Control means for receiving the synchronous signal (C-Sync), the horizontal synchronous signal (H-Sync), the vertical synchronous signal (V-Sync), and the field signal to control the recording and reproducing of the video signal, and by the control of the control means. D / A converting means for converting an analog video signal read out from the memory into the analogue video signal by the sampling clock signal, and captured by the camera according to selection of a recording / playback signal (REC / PLAY SIGNAL) from the control means. Switching means for selectively switching an input video signal or a playback video signal converted into analog from the D / A conversion means, and a composite synchronous signal, a vertical synchronous signal, and a horizontal motion signal from a video signal input from a camera. Synchronizing signal separating means for separating signals, field signals, and the like, sampling clock generating means for generating a sampling clock fs in synchronization with the composite synchronizing signal or horizontal synchronizing signal separated from the synchronizing signal separating means, and the sampling clock signal Receiving the address and increasing the address to the control means, applying an address start signal to the effective video data detecting means, and detecting the start and end of the valid video signal and applying it to the control means. And an A / D conversion means for converting an effective video signal detection means and an analog signal in the effective video signal area into a digital video signal in accordance with a sampling clock.