KR0154012B1 - Improved video cassette recorder system having a plurality of stationary heads - Google Patents

Abstract

The present invention relates to an apparatus for recording and reproducing video signals, and more particularly, to a quasi-fixed head video cassette recorder capable of serially processing video signals of a plurality of quasi-fixed heads, that is, magnetic resistive heads. VIDEO CASSETTE RECORDER) system.

To this end, the present invention, a plurality of quasi-fixed head 12 connected in parallel; A video signal processor 14 for recording and outputting an input video signal in a recording mode, and reproducing and outputting an input video signal in a playback mode; A multiplexer 20 which multiplexes the image signals output from the plurality of quasi-fixed heads 12 and applies them to the image signal processor 14; The demultiplexer 30 outputs a plurality of quasi-fixed heads 12 by parallel processing the video signals output from the video signal processor 14, thereby reducing the number of terminals connected to the plurality of heads.

Description

Semi fixed head video cassette recorder system

1 is a block diagram showing the configuration of a conventional semi-fixed head video cassette recorder system.

2 is a block diagram showing the configuration of a quasi-fixed head video cassette recorder system according to the present invention.

* Explanation of symbols for main parts of the drawings

10: control command authorizing unit 11: control unit

12 head 13 connection

14: video signal processor 20: multiplexer

30: Demultiplexer H1 ~ Hn: Head

The present invention relates to an apparatus for recording and reproducing video signals, and more particularly, to a quasi-fixed head video cassette recorder capable of serially processing video signals of a plurality of quasi-fixed heads, that is, magnetic resistive heads. VIDEO CASSETTE RECORDER: hereinafter referred to as VRC) system.

In general, magnetic recording and reproducing methods such as V-Cal or audio tape recorder are made by sliding of the magnetoresistive element portion with a recording medium, for example, magnetic tape or magnetic disk. Unlike the audio head, V-Cal's video head is installed around the rotating head drum as needed to speed up the relative speed. Because of this requirement, the rotating head drum is structurally complex and bulky.

With the head array of this structure, the video signal has a recording format in which the video signal is recorded in most of the tape width direction and the audio signal and control signal are respectively recorded in the long width direction at the edge portion of the tape. In general, V-Cal uses a helical scanning method in which the rotation of the rotating head drum and the direction of tape travel are inclined to each other and the tape is brought into contact with the rotating head drum to scan. In this manner, obliquely long tracks are formed on a narrow tape, and a plurality of signals, for example, a video signal of one field, are sequentially recorded and reproduced in each track.

Such a typical helical scanning VRT system requires stable control of the head drum rotation in order to prevent possible changes in the time axis of the video signal during recording and playback, and precise tracking control during playback. In order to prevent the noise ratio from deteriorating, a drum servo circuit for controlling the rotation of the drum and a capstan servo circuit for controlling the tracking have to be used, which causes a complicated circuit and mechanical structure.

In order to overcome this problem, a quasi-fixed head VAL system in which a head array having a plurality of head gaps scans a tape without a rotating head drum is provided.

The quasi-fixed head BCAL system described above maintains compatibility with a conventional helical scanning BCLC system, and has a merit that the driving and control mechanism of the head array can be simplified and miniaturized.

FIG. 1 is a block diagram of a quasi-fixed head VRL system according to the prior art, which is output from a control command applier 10 and a control command applier 10 composed of conventional key metrics for applying a control command of a user. A control unit 11 for outputting a control signal corresponding to the signal, a plurality of heads 12 for recording and reproducing the video signal under the control of the control unit 11, the video signal output from the plurality of heads 12 The video signal processor 14, the plurality of heads 12, and the video signal processor 14 are connected to each other and have a connection part 13 having pin numbers corresponding to the plurality of heads.

In this case, the connection part 13 is connected to two signal lines for one head as shown in the drawing, so in the case of a plurality of heads, the number of output terminals of the connection part 13 is increased so that the area of the connection part 13 becomes large. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a quasi-fixed head VSR for reducing the number of output terminals connected to the head by serially processing the video signals of a plurality of quasi-fixed heads. have.

Features of the present invention for achieving the above object, a plurality of quasi-fixed heads connected in parallel; A video signal processor for recording and outputting an input video signal in a recording mode, and reproducing and outputting an input video signal in a playback mode; A multiplexer for multiplexing image signals output from a plurality of quasi-fixed heads and applying the multiplexed image signals to the image signal processor; And a demultiplexer configured to process the image signals output from the image signal processor in parallel and output them to a plurality of quasi-fixed heads.

Other objects and various features of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

2 is a block diagram showing the configuration of the quasi-fixed head VRL system according to the present invention, wherein the control command applying unit 10, the control unit 11, a plurality of heads 12, and a multiplexer (MUX) 20 are shown. And a video signal processor 14 and a demultiplexer (DMUX) 30.

The control command applier 10 is configured with key metrics to apply a VRC operation control command by the user, and the controller 11 outputs a control signal corresponding to the signal output from the control command applier 10. In addition, as can be seen in the following description, a signal for controlling the multiplexer 20 and the demultiplexer 30 is output.

As is known, the multiplexer 20 is composed of a circuit for multiplexing multiple independent information signals according to an enable signal of the control unit 11 and outputting them as one information signal. Accordingly, the multiplexer 20 multiplexes the number of terminals output from the plurality of heads 12 and outputs the image signals read out from the plurality of heads 12 through one output terminal under the control of the control unit 11. It is configured to output to 14.

At this time, the video signal processing unit 14 processes the video signal output through the output terminal of the multiplexer 20 and outputs it to the monitor in the playback mode.

Meanwhile, in the recording mode, the demultiplexer 30 demultiplexes the video signal output from the video signal processor 14 according to the enable signal of the controller 11 to connect the plurality of heads 12 to record the video signal. Consists of.

As described above, the device of the present invention is configured to multiplex and output a plurality of terminals connected to a plurality of heads by a multiplexer, thereby reducing the number of terminals connected to the head.

While the invention has been shown and described with respect to certain preferred embodiments, those skilled in the art will recognize that various modifications and changes can occur without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (1)

A plurality of quasi-fixed heads 12 connected in parallel; A video signal processor 14 for recording and outputting an input video signal in a recording mode, and reproducing and outputting an input video signal in a playback mode; A multiplexer (20) for multiplexing the image signals output from the plurality of quasi-fixed heads (12) and applying them to the image signal processor (14); Quasi-fixed head video cassette recorder system comprising a demultiplexer (30) for parallel processing the video signals output from the video signal processor (14) to output to the plurality of quasi-fixed heads (12).