KR19990042764A - How to Synchronize VRF Copy System - Google Patents

Abstract

The present invention relates to a synchronization method of a VCR copying system which simultaneously copies and outputs video and audio signals reproduced by a reproduction VCR from a plurality of copy VCRs connected to the reproduction VCR. Providing a VCR, the system clock for matching the copy timings of the plurality of copy VCRs, from the reproduction VCR; Determining each of the plurality of copy VCRs based on the system clock provided by the playback VCR; The plurality of copy VCRs may include copying video and audio signals provided from the playback VCR at the determined copy timing.

Description

How to Synchronize VRF Copy System

The present invention relates to a VCR copying system composed of a playback VCR (Video Cassette Recorder) for playing video and audio signals and a plurality of copy VCRs connected to the playback VCR. The present invention relates to a synchronization method for making copy timings coincide with each other when copying from a VCR.

In general, VCR copying systems are classified into two types according to their functions, for example, a system for copying video and audio signals recorded on one playback tape to a plurality of recording tapes, and a plurality of playback tapes. The video and audio signals contained in can be divided into a system for editing and recording on a single recording tape.

Herein, a VCR copying system for copying video and audio signals recorded on one playback tape to a plurality of recording tapes will be described with reference to FIG.

In Fig. 1, the VCR copying system is composed of a playback VCR 100 and a plurality of copy VCRs 200, 300, 400 connected to the playback VCR 100.

Meanwhile, the playback VCR 100 includes a key input unit 110, a playback unit 120, and a microcomputer 130, and each copy VCR 200, 300, and 400 includes a recording unit 210, 310, 410, and a sub micom 220, 320, 420. In addition, the reproducing unit 120 and the recording units 210, 310, and 410 are connected to the signal transmission line L1, and the microcomputer 130 and the submicrocoms 220, 320, and 420 are connected to the control line L2.

In the VCR copy system configured as described above, when the user provides the copy key signal to the microcomputer 130 using the key input unit 110, the microcomputer 130 provides a copy instruction signal on the control line L2. The controller 120 controls the playback unit 120 to reproduce the video and audio signals recorded on the playback tape.

The copy instruction signal on the control line L2 is transmitted to each of the sub-microcoms 220, 320, and 420, and each sub-microcom 220, 320, 420, which has received the copy instruction signal, provides an operation signal to the corresponding recorder 210, 310, 410, and the recorder 210, 310, 410. To work.

On the other hand, the playback unit 120 reproduces the video and audio signals recorded on the playback tape under the control of the microcomputer 130 and provides them on the signal transmission line L1, and the video and audio signals on the signal transmission line L1. Are distributed to and supplied to the recording units 210, 310, and 410, respectively.

Therefore, the recording units 210, 310, and 410 record the video and audio signals input through the signal transmission line L1 on the recording tape, respectively.

Here, each of the recording units 210, 310, and 410 described above is composed of a plurality of constituent members, although not shown in the drawing. Therefore, when the sub-microcoms 220, 320, and 420 provide the operation signals to the corresponding recording units 210, 310, and 410, the component members inside the recording units 210, 310, and 410 provide the operation signals with precise timing such that they are organically driven with each other. The timing for providing the operation signal in the sub-microcoms 220, 320 and 420 is based on the system clock generated inside each of the sub-microcoms 220, 320 and 420.

That is, when each sub micom 220, 320, 420 receives a copy instruction signal generated by the microcomputer 130, the sub micoms 220, 320, and 420 do not immediately provide an operation signal to the recording units 210, 310, and 410, but are actually generated inside each sub micom 220, 320, 420. Based on the clock, the constituent members of the recording units 210, 310, and 410 provide an operation signal in accordance with the timing at which they can be organically driven with each other.

However, since the system clocks generated by the sub-microcoms 220, 320 and 420 operate independently of each other, the system clocks generated by the sub-microcoms 220, 320 and 420 may not coincide in phase with each other. For example, the system clock generated in the sub-microcom 220 and the system clock generated in the sub-microcom 320 may be slightly out of phase with each other.

Therefore, due to the phase difference between the system clocks generated in the sub-microcoms 220, 320, and 420, a time difference exists between the operation signals provided to the corresponding recording units 210, 310, and 410 in the sub-microcoms 220, 320, and 420.

As a result, even if the same video signal and audio signal are input to the recording units 210, 310, and 410, there is a problem that the contents of the recording start portion do not exactly match because the recording start time is slightly different.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a synchronization method in which the copy timings of the video and audio signals reproduced in the reproduction VCR are matched with each other.

In order to achieve the above object, the present invention provides a synchronization method of a VCR copying system which simultaneously copies video and audio signals reproduced and output from a reproduction VCR in a plurality of copy VCRs connected to the reproduction VCR. Providing the reproduced video and audio signals to the plurality of copy VCRs, and outputting a system clock at the playback VCR to match the copy timing of the plurality of copy VCRs; Determining each of the plurality of copy VCRs based on the system clock provided by the playback VCR; The plurality of copy VCRs may include copying video and audio signals provided from the playback VCR at the determined copy timing.

1 shows a prior art VCR copying system,

2 is a block diagram of a VCR copying system for performing a synchronization method of the present invention;

3 is a detailed flowchart illustrating a preferred embodiment of the synchronization method of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: Playback VCR 200,300,400: Copy VCR

110: key input unit 120: playback unit

130: micom 210,310,410: record

220,320,420: Sub Micom

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

2 is a block diagram of a VCR copying system for implementing the synchronization method of the present invention.

As shown in Fig. 2, the VCR copying system for implementing the synchronization method of the present invention may be substantially similar to the configuration of Fig. 1 showing the prior art. When the video and audio signals are copied from each copy VCR, a clock line L3 is further provided to directly provide a system clock to the copy VCR from the playback VCR so that the copy timings of each other match.

Therefore, in FIG. 2, the same constituent members performing substantially the same functions as those of FIG. 1 are shown with the same reference numerals for easy understanding.

FIG. 3 is a detailed flowchart showing a preferred embodiment of the synchronization method of the present invention performed using the VCR copying system configured as shown in FIG. 2.

First, when a user provides a copy key signal to the microcomputer 130 using the key input unit 110 (S1), the microcomputer 130 provides a copy instruction signal on the control line L2 (S2), The system clock is provided on the clock line L3 (S3), and the playback unit 120 is controlled to reproduce the video and audio signals recorded on the playback tape (S4).

Therefore, the copy instruction signal on the control line L2 and the system clock on the clock line L3 are transmitted to each of the sub-microcoms 220, 320 and 420, respectively, and the reproducing section 120 controls the playback tape under the control of the microcomputer 130. The video and audio signals contained in are reproduced and provided on the signal transmission line L1.

Video and audio signals on the signal transmission line L1 are distributed to and provided to the recording units 210, 310, and 410, respectively.

Each sub micom 220, 320, and 420 receives a copy instruction signal through the control line L2 (S5) and then inputs a system clock through the clock line L3 (S6). The operation signals are provided to the corresponding recording units 210, 310, and 410 according to timings at which the constituent members of the 210, 310, and 410 are organically driven (S7).

When the operation signals are applied from the corresponding sub-microcoms 220, 320, and 420, the recording units 210, 310, and 410 start the operation and record the video and audio signals input through the signal transmission line L1 on the recording tape, respectively (S8).

As described above, the present invention relates to a VCR copying system composed of a playback VCR that plays back video and audio signals and a plurality of copy VCRs connected to the playback VCR, wherein the video and audio signals distributed and provided by the playback VCR are distributed to each copy VCR. When copying, a system clock to match the copy timing is simultaneously provided to each copy VCR in the playback VCR, and each copy VCR copies video and audio signals in synchronization with the system clock provided in the playback VCR. There is an effect that the contents of the recording start portion of the mounted recording tape are exactly matched.

Claims (1)

A synchronization method of a VCR copying system for simultaneously copying video and audio signals played back on a playback VCR and outputting from a plurality of copy VCRs connected to the playback VCR: Providing the video and audio signals reproduced in the reproduction VCR to the plurality of copy VCRs, and outputting a system clock at the reproduction VCR to match the copy timings of the plurality of copy VCRs; Determining each of the plurality of copy VCRs based on the system clock provided by the playback VCR; And said plurality of copy VCRs comprises copying video and audio signals provided from said playback VCR at said determined copy timing.