KR20000004435A - Recording/regenerating automatic recognition apparatus of a video cassette recorder - Google Patents

Abstract

PURPOSE: A recording/regenerating automatic recognition apparatus is provided to prevent an erroneous setting owing to an immaturity of a user. CONSTITUTION: The recording/regenerating automatic recognition apparatus comprises: a delay flip flop(22) for outputting a channel control signal according to a record mode of a video cassette recorder to a video signal processing part(21); a record select switch(23) for selectively switching an image switch trigger signal(VTi) from the video cassette recorder and a memory read signal(ROE) so as to be supplied to the delay flip flop; a record trigger signal processing part(24) for judging the record mode of the video cassette recorder according to the existence of an input of the image switch trigger signal(VTi) to switch an operation of the record select switch; a regeneration select switch(25) for selectively switching an S-VHS video signal and a normal video signal so as to be supplied to an image input terminal of the video signal processing part; and a synchronous signal detecting part(26) for judging the regeneration mode according to the existence of a synchronous signal for a video signal from the video cassette recorder at video signal regenerating.

Description

VRC's automatic recording / playback mode

The present invention relates to an apparatus for automatically recognizing a recording / playback mode of a VCR, and more particularly, to automatically recognize each selection mode setting state in a recording and playback mode when recording and playing back to a VCR using a multiplexer in a CCTV system. The present invention relates to a recording / playback mode automatic recognition device of a VCR.

Generally, closed circuit tele-vision (hereinafter referred to as CCTV) system is installed in general houses, department stores, banks, factories, and exhibition halls to prevent theft and to check the operation status and process flow of the machine easily. It is a device that is widely used for monitoring and installed in major intersections and used to identify traffic conditions. Such a CCTV system is composed of one or more video cameras for capturing a surveillance object, a monitor for outputting an image taken from a video camera to a screen, and a VCR for recording the image captured by the video camera for later playback.

In such a conventional CCTV system, an operation mode of a VCR that records and plays back images taken by a plurality of video cameras, that is, a time-lapse mode and a normal mode is selected for recording, and a type of VCR for playing. The playback operation is selected in the S-VHS mode and the normal mode. At this time, the method of selecting each operation mode is to set each selection mode of the recording mode and the playback mode on the main screen displayed on the monitor. However, there is a problem that recording / playback is not performed correctly when the user does not properly set each item in accordance with the type of VCR for each option on each operation mode. In addition, there is a problem that the after-service request is frequently generated due to the incorrect setting of each option according to the user's inexperience.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and an object thereof is to automatically set appropriately the selection of the recording / playback mode of the VCR according to the type of the VCR so that the VCR can operate normally. It is to provide a recording / playback mode automatic recognition device.

In order to achieve the above object, the automatic recording / playback mode recognizing apparatus of a VCR according to the present invention performs a predetermined signal processing on a video signal captured by a plurality of video cameras through a video signal processing unit, and then, In a CCTV system for recording in a normal mode and playing back a monitor in S-VHS mode and a normal mode according to a playback mode, the D flip-flop outputs a channel control signal according to the recording mode of the VCR to the video signal processor. And a recording selection switch for selectively switching the image switching trigger signal VTi and the memory read signal ROE output from the VCR to provide the clock signal of the D flip-flop, and the image switching trigger signal VTi. Recording trigger signal processing for switching the operation of the recording selection switch by determining the recording mode of the VCR according to the presence or absence of an input. A playback selection switch for selectively switching the S-VHS video signal and the normal video signal when the video signal is reproduced and outputting the video signal to the video input terminal of the video signal processing unit, and synchronizing the video signal output from the VCR when the video signal is reproduced. And a synchronizing signal detection unit for determining the regeneration mode according to the presence or absence of a signal and switching the regeneration selection switch.

1 is a system block diagram showing a schematic configuration of a CCTV system to which the present invention is applicable;

2 is a block diagram showing the configuration of a multiplexer for implementing an apparatus for automatically recognizing a recording / playback mode of a VCR according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: video camera, 20: multiplexer,

21: video signal processor, 22: D flip flop,

23: recording selection switch, 24: recording trigger signal processing unit,

25: regeneration selection switch, 26: synchronous detection unit,

30: VCR, 40: monitor.

Hereinafter, an apparatus for automatically recognizing a recording / playback mode of a VCR according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a system block diagram showing a schematic configuration of a CCTV system to which the present invention is applicable. As shown in FIG. 1, in a CCTV system to which the present invention is applicable, a plurality of channels of video signals input from a plurality of video cameras 10 for capturing a surveillance object are selectively switched to output to a monitor and a VCR to be described later. A multiplexer 20, a monitor 40 for displaying a plurality of channels of video signals input from the multiplexer 20 on a single screen or a split screen, and a plurality of channels of video signals input from the multiplexer 20 And a VCR 30 for recording in time-lapse mode and normal mode so as to be reproduced after recording, and reproducing in S-VHS mode and normal mode.

In the above-described configuration, the VCR 30 selectively receives a plurality of channel video signals from the multiplexer 20 through an image input terminal, records them in a time lapse mode or a normal mode, and then reproduces them through the monitor 40. The video output terminal outputs the video recorded by the multiplexer 20.

On the other hand, CCTV systems record a subject to be monitored by one or more video cameras, and then record it on a VCR. In order to reduce the amount of tape required for recording, a so-called time lapse VCR is adopted. Doing. Time Lapse VCR does not record a plurality of video signals input from one or more video cameras for the purpose of surveillance recording function, but instead repeats recording and stopping at regular intervals. Becomes

In a CCTV system using the time-lapse VCR, a video signal of a plurality of channels input from a video camera is multiplexed by a multiplexer or a frame switcher. / 30 seconds) in order to record multiple times on the time-lapse VCR. In this case, when the operation mode of the time-lapse VCR is set to the time-lapse mode, video signals input from multiple channels are recorded by one field or one frame, and then recording is stopped and video switching trigger signals are output by the multiplexer to output video signals of other channels. Will be recorded. On the other hand, in the normal mode, video signals input from a plurality of channels are sequentially switched by one field or one frame to perform recording.

2 is a block diagram illustrating a schematic configuration of a multiplexer for implementing an apparatus for automatically recognizing a recording / playback mode of a VCR according to the present invention. As shown in Fig. 2, the multiplexer 20 for implementing the present invention includes a microprocessor (not shown) that collectively controls the overall operation, and predetermined signals for video signals captured by a plurality of video cameras. D flip-flop which performs the processing and outputs the video signal processor 21 for outputting to the VCR 30 and the monitor 40 and the channel count signal output from the microphone processor and outputs the channel control signal according to the recording mode of the VCR. (22), a recording select switch (23) for selectively switching a trigger signal (VTI) and a memory read signal (ROE) output from the VCR 30 to provide the clock signal of the D flip-flop 22; A recording trigger signal processor 24 for switching the operation of the recording selection switch 23 by determining the recording mode setting state of the VCR by receiving the trigger signal, and a ratio output from the S-VHS VCR; A playback selection switch 25 for selectively switching a false signal and a normal video signal and outputting the video signal to the video input terminal of the video signal processor 21, and determining whether there is a synchronization signal with respect to the normal video signal reproduced and output from the VCR. And a synchronization signal detection unit 26 for controlling the switching operation of the reproduction selection switch 25 to set the reproduction mode of the VCR.

Hereinafter, operations and effects of the automatic recording / playback mode recognition apparatus of the VCR according to the present invention will be described in detail with reference to the accompanying drawings.

First, when a user wants to record a multi-channel video signal shot from a video camera using the normal VCR or a time-lapse VCR to the VCR 30 in the normal mode, the trigger signal of the recording selection switch 23 when the recording mode is set. The trigger signal is not input to the input terminal, and the field signal of 1/30 second period is input to the memory read signal (ROE) terminal. Accordingly, as the trigger signal is not input in the recording trigger signal processing unit 24, the contact point of the switch is provided so that the memory read signal ROE of the recording selection switch 23 can be provided as a clock signal of the D flip-flop 22. It is switched. At this time, the D flip-flop 22 receives the channel count signal output from the microprocessor and the memory read signal ROE output from the recording selection switch 23 to receive the video signals captured by the plurality of video cameras 10. The channel control signal is output to the video signal processor 21 so as to sequentially record the VCR for each channel.

On the other hand, when recording in time-lapse mode using the time-lapse VCR, the VCR outputs an image switching trigger signal to the multiplexer 20 through the trigger signal output terminal to switch the video channel input from the multiplexer 20. Done. At this time, when the trigger signal is input from the VCR 30, the multiplexer 20 switches the video channels input from the plurality of video cameras and outputs them to the image input terminal of the VCR 30. Therefore, the recording trigger signal processing unit 21 outputs a control signal to switch the contact point of the recording selection switch 23 to the trigger signal input side as the trigger signal is input from the trigger output terminal of the VCR 30 to the trigger signal input terminal. Done.

At this time, in the D flip-flop 22, the recording trigger signal output from the VCR 30 is input as a clock signal, so that the recording cycle according to the time-lapse recording mode, that is, the maximum 960 hours, switches the channel every 8 seconds. The channel control signal is output to the video signal processor 21 to perform recording of the signal.

In addition, when the video signal recorded on the VCR 30 is to be reproduced and output, the synchronization detection unit 26 detects the presence or absence of a synchronization signal from the normal video signal output from the VCR 30, and when the synchronization signal is detected. It is determined that the video is in normal mode playback, and outputs a signal of 'high' level as a predetermined level, and when the synchronization signal is not detected, it is determined to play in S-VHS mode and outputs a signal of 'low' level to select playback. The contact point of the switch 25 is switched. Therefore, the video signal processing unit 21 reproduces the video signal input from the VCR 30 to the video input terminal according to the contact switching of the reproduction selection switch 25 and outputs it to the monitor 40.

The apparatus for automatically recognizing a recording / playback mode of a VCR according to the present invention is not limited to the above-described embodiments, and may be modified in various ways within the scope of the technical idea of the present invention.

As described above, the VCR and the multiplexer are automatically set by the VCR according to the present invention by automatically setting the recording / playback mode of the VCR by the video signal input from the VCR during recording and playback of the video signal. By matching the mode settings of, recording and playback can be performed accurately. In addition, since the user does not need to set the recording / playback mode through the program menu, the user's convenience can be improved.

Claims (1)

After the video signals shot by multiple video cameras have been processed through the video signal processor, they are recorded on the VCR in the Type Labs mode and the Normal mode, and then played back on the monitor in the S-VHS mode and Normal mode depending on the playback mode. In CCTV system that outputs A D flip-flop for outputting a channel control signal according to a recording mode of the VCR to the video signal processor; A recording selection switch for selectively switching an image switching trigger signal VTi and a memory read signal ROE output from the VCR to provide a clock signal of the D flip-flop; A recording trigger signal processor configured to switch the operation of the recording selection switch by determining a recording mode of the VCR according to whether the image switching trigger signal VTi is input; A playback selection switch for selectively switching an S-VHS video signal and a normal video signal to an image input terminal of the video signal processor; Automatically recognize the recording / playback mode of the VCR, characterized in that it comprises a synchronization signal detection unit for determining the playback mode according to the presence or absence of a synchronization signal for the video signal output from the VCR to switch the playback selection switch when the video signal is played back. .