KR930006884Y1 - Initial picture stabilization circuit for vtr - Google Patents

Initial picture stabilization circuit for vtr Download PDF

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Publication number
KR930006884Y1
KR930006884Y1 KR2019880018591U KR880018591U KR930006884Y1 KR 930006884 Y1 KR930006884 Y1 KR 930006884Y1 KR 2019880018591 U KR2019880018591 U KR 2019880018591U KR 880018591 U KR880018591 U KR 880018591U KR 930006884 Y1 KR930006884 Y1 KR 930006884Y1
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South Korea
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recording
signal
head
output
transistor
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KR2019880018591U
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Korean (ko)
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KR900010688U (en
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김정호
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삼성전자 주식회사
안시환
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing

Abstract

내용 없음.No content.

Description

비디오 테이프의 초기화면 안정화 회로Initial screen stabilization circuit of video tape

제1도는 본 고안에 따른 회로도.1 is a circuit diagram according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

HRP1, HRP2: 녹화재생헤드 HE: 소거헤드H RP1 , H RP2 : Recording playback head H E : Erasing head

SW1, SW2: 녹화재생 선택스위치 SR: 녹화신호SW 1 , SW 2 : Record play select switch S R : Record signal

SE: 소거신호S E : Cancel signal

본 고안은 비디오 테이프 레코더(VTR : Video Tape Recorder)의 자기 녹화·재생부의 회로에 관한 것으로서, 특히 녹화가 시작되는 비디오 테이프의 초기화면 부분까지도 완전히 소거하여 녹화될 수 있도록 함으로써 재생되는 초기화면을 안정화 시킬 수 있는 회로를 제공코자 한 것이다.The present invention relates to the circuit of the magnetic recording and reproducing section of a video tape recorder (VTR), and particularly stabilizes the initial screen to be reproduced by completely erasing even the initial screen portion of the video tape where recording starts. To provide a circuit that can be made.

일반적으로 비디오 테이프 레코더는 테이프의 공급릴로부터 일정 간격을 두고 소거헤드가 장치되어 있고 이 소거헤드로부터 소정의 간격을 두고 회전헤드 실린더가 장착되어 있는데 이 실린더상에는 녹화재생헤드가 장치되어 있다.In general, a video tape recorder is provided with an erasing head at a predetermined interval from a supply reel of tape, and a rotating head cylinder is provided at a predetermined interval from the erasing head.

이와 같은 비디오 테이프 레코더로 녹화를 행하는 동작 과정을 대략 다음과 같다.An operation process of recording with such a video tape recorder is as follows.

녹화를 하겠다는 녹화신호와 테이프상에 이전에 녹화되어 있는 정보를 소거하겠다는 소거신호가 동시에 출력되어 녹화재생헤드와 소거헤드가 동시에 구동되어진다. 공급릴로부터 공급되어지는 비디오 테이프는 소거헤드에 의해 먼저 소거되어지고 계속되는 릴의 작동에 의해 테이프는 녹화재생헤드로 옮겨져서 녹화되어진다. 즉 녹화 동작을 행하면 이전의 정보가 소거되어지면서 그 소거되어진 부분에 녹화하고자 하는 정보들이 기록되어지는 것이다.The recording signal for recording and the erasing signal for erasing information previously recorded on the tape are output at the same time so that the recording reproduction head and the erasing head are driven simultaneously. The video tape supplied from the supply reel is first erased by the erasing head, and by subsequent reel operation, the tape is transferred to the recording / reproducing head and recorded. That is, when the recording operation is performed, the previous information is erased and the information to be recorded is recorded in the erased portion.

그런데 소거헤드와 녹화재생헤드는 어느 정도의 거리를 두고 장착되어 있기 때문에 녹화 시작시에 소거헤드와 녹화재생헤드사이에 걸쳐있는 부분의 테이프는 소거가 되지 않은 상태에서 녹화가 이루어진다. 따라서 녹화시작 부분의 테이프상에는 이전에 녹화되어 있던 정보와 현재 녹화되는 정보가 겹쳐지게 되어 재생시에 이 부분은 이중 화면을 발생시키는 문제점을 초래하게 한다.However, since the erasing head and the recording / reproducing head are mounted at a certain distance, the tape in the portion between the erasing head and the recording / reproducing head at the start of recording is recorded without being erased. Therefore, the previously recorded information and the currently recorded information are superimposed on the tape at the beginning of the recording, which causes a problem of generating a dual screen during playback.

본 고안은 상술한 바와 같은 비디오 테이프상의 녹화 초기 부분까지도 완전히 소거한 상태에서 녹화할 수 있도록 하여 재생시에 초기 부분의 이중화면을 제거시킬 수 있는 녹화 동작 회로를 제공하는데 그 목적이 있다.It is an object of the present invention to provide a recording operation circuit capable of removing a double picture of an initial portion at the time of reproduction by enabling recording in a completely erased state even in the initial recording portion on a video tape as described above.

상기 목적을 달성하기 위한 본 고안은 외부 마이콤(MICOM)으로부터 녹화신호가 출력되더라도 일단 녹화동작을 중지시켜 놓고, 동시에 녹화신호로써 소거헤드를 먼저 구동시킨 다음 소거헤드에 의해 테이프상의 소거되어진 부분이 녹화재생헤드에 이르를 때에 비로소 녹화를 시작할 수 있도록 구성되어 있는 것이 특징이다.In order to achieve the above object, the present invention stops the recording operation even when the recording signal is output from the external MICOM, and simultaneously drives the erasing head as the recording signal, and then the portion erased on the tape by the erasing head is recorded. It is characterized by being configured to start recording only when the playhead is reached.

이하 본 고안의 구성 및 작용, 효과를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the configuration, operation, and effects of the present invention will be described in detail.

제1도는 본 고안에 따른 비디오 테이프의 녹화 동작 회로도로서, 소거헤드(HE)의 일측 구동단자에는 외부 마이콤(MICOM)으로부터 출력되는 녹화신호(SR)에 의해 턴온되는 트랜지스터(Q1)의 콜렉터단자가 접속되고 녹화 재생헤드(HRP1, HRP2)의 각 구동단자에는 트랜지스터(Q3,Q4)의 콜렉터단자가 각기 접속되고 그 트랜지스터(Q3, Q4)의 각 베이스단자에는 트랜지스터(Q2)의 에미터단자가 접속되어 있으며 이 트랜지스터(Q2)의 베이스단자에는 녹화신호(SR)를 지연시키기 위한 저항(R2) 및 캐패시터 (C)로 구성된 지연회로가 접속되어 있다. 그리고 녹화재생헤드(HRP1, HRP2)의 가 타측 단자에는 녹화신호(SR)에 따라 비디오신호(VIN)의 입력단자(REC1, REC2)또는 출력단자(PB1,PB2)가 접속되도록 되어 있다.1 is a circuit diagram illustrating an operation of recording a video tape according to the present invention, and on one driving terminal of the erasing head H E , the transistor Q 1 is turned on by the recording signal S R output from an external microcomputer MICOM. The collector terminal is connected, and the collector terminals of the transistors Q 3 and Q 4 are respectively connected to the driving terminals of the recording and playback heads H RP1 and H RP2 , and the transistors are connected to the respective base terminals of the transistors Q 3 and Q 4 . An emitter terminal of Q 2 is connected, and a delay circuit composed of a resistor R 2 and a capacitor C for delaying the recording signal S R is connected to the base terminal of the transistor Q 2 . . The other terminal of the recording / playback heads H RP1 and H RP2 has an input terminal REC 1 , REC 2 or an output terminal PB 1 , PB 2 of the video signal V IN according to the recording signal S R. Is to be connected.

이상과 같이 구성된 녹화 재생 회로의 동작 관계를 설명하면 다음과 같다.The operation relationship of the recording / reproducing circuit configured as described above is as follows.

외부에서 녹화를 수행하기 위한 조작을 하게 되면 외부 마이콤(MICOM)으로부터 H레벨의 녹화신호(SR)가 출력된다. 이 H레벨의 녹화신호(SR)는 녹화재생 선택스위치(SW1, SW2)의 제어단자(CON1,CON2)에 인가되어 녹화재생헤드(HRP1, HRP2)의 각 입출력단자(RP1, RP2)를 녹화단자(REC1, REC2)에 접점시켜 비디오 신호(VIN)를 입력 즉 녹화할 수 있는 상태로 되게 하는 한편, 저항(R2) 및 캐패시터(C)로 구성된 지연회로에 인가되어 시정수(R2XC)에 따른 소정의 시간동안 트랜지스터(Q2)를 턴오프시켜 트랜지스터(Q3,Q4)를 턴오프시킴으로써 녹화 재생헤드(HRP1,HRP2)가 일단 구동되지 않도록 한다.When an operation for recording is performed externally, a recording signal S R having a high level is output from the external MICOM. The recording signal S R of this H level is applied to the control terminals CON 1 and CON 2 of the recording / playback selection switches SW 1 and SW 2 so that each input / output terminal of the recording / playback heads H RP1 and H RP2 is applied. RP 1 , RP 2 ) is connected to the recording terminals REC 1 , REC 2 to make the video signal V IN available for input, that is, recording, while consisting of resistor R 2 and capacitor C. be applied to the delay circuit time constant (R 2 X C) is turned off by the recording playback head for a predetermined time while the transistor (Q 2) is turned off by a transistor (Q 3, Q 4) to according to (H RP1, H RP2) Is not driven once.

또한 이와 동시에 H레벨의 녹화신호(SR)는 트랜지스터(Q1)를 턴온시켜 소거헤드(HE)를 구동시킨다.At the same time, the H-level recording signal S R turns on the transistor Q 1 to drive the erase head H E.

여기서 H레벨의 녹화신호(SR)가 출력되는 시점으로부터 녹화재생헤드(HRP1, HRP2)가 구동되는 시간, 즉 지연회로의 지연간을 테이프가 계속 전진하여 소거되어진 부분이 녹화재생헤드(HRP1, HRP2)를 지나갈 때까지의 시간과 일치시키도록 한다.In this case, the portion of the tape which is erased by continuously advancing the time during which the recording / reproducing heads H RP1 and H RP2 are driven from the time at which the recording signal S R of the H level is output, that is, the delay of the delay circuit is recorded. Match the time to pass H RP1 , H RP2 ).

지연회로에 의한 소정의 시간이 지난 후 캐패시터(C)가 충전완료되면 트랜지스터(Q2)가 턴온되고 트랜지스터(Q2)의 턴온에 의해 녹화재생헤드(HRP1, HRP2)측의 각 트랜지스터(Q3,Q4)가 턴온되어 녹화재생헤드(HRP1,HRP2)가 비로소 구동되어진다.When the capacitor C is fully charged after a predetermined time by the delay circuit, the transistor Q 2 is turned on and the transistor Q 2 on the recording / reproducing heads H RP1 and H RP2 is turned on by the transistor Q 2 . Q 3 and Q 4 ) are turned on to start the recording / playback heads H RP1 and H RP2 .

이와 같이 본 고안은 외부 마이콤으로부터 녹화신호가 출력되더라도 캐패시터가 충전되는 시간만큼 녹화를 일시 중지시키고, 동시에 그 녹화신호(SR)로써 소거헤드 (HE)를 구동시켜 소거되어진 부분의 테이프가 녹화재생헤드(HRP1, HRP2)를 통과할 때부터 녹화를 실시할 있도록 된 것이다.In this way, even if the recording signal is output from the external microcomputer, recording is paused as long as the capacitor is charged, and at the same time, the erasing head H E is driven by the recording signal S R to record the tape of the erased portion. Recording starts when the playback heads H RP1 and H RP2 pass.

이에 따라, 비디오 테이프는 그 녹화 초기 부분까지도 소거되어진 상태에서 녹화가 되어지므로 녹화상태가 양호하게 되어 재생시에 초기 화면이 안정화되는 효과를 얻을 수 있는 것이다.As a result, the video tape is recorded in a state where even the initial recording portion is erased, so that the recording state is satisfactory, and the initial screen is stabilized at the time of reproduction.

Claims (1)

외부 마이콤(MICOM)으로부터 출력되는 소거신호(SE)의 출력에 의해 소거헤드(HE)가 구동되고 녹화신호(SR)의 출력에 의한 녹화재생 선택스위치(SW1,SW|2)의 선택에 따라 녹화재생헤드(HRP1, HRP2)를 구동시켜 비디오신호(VIN,VOUT)를 입출력하도록 된 것에 있어서, 녹화신호(SR)는 저항(R1) 및 다이오드(D1)를 거쳐 트랜지스터 (Q1)를 턴온시켜 소거헤드(HE)를 구동시키고 그 녹화신호(SR)는 저항(R2) 및 캐패시터(C)로 구성된 지연회로에 의해 녹화재생헤드(HRP1, HRP2)의 구동을 일시 중시시킨 후 캐패시터(C)가 충전완료되면 트랜지스터(Q2)가 턴온되어 트랜지스(Q3,Q4)를 턴온시켜 녹화재생헤드(HRP1,HRP2)를 구동시키도록 하여서 된 것을 특징으로 하는 비디오 테이프의 초기화면 안정화 회로.The erasing head H E is driven by the output of the erasing signal S E output from the external MICOM, and the recording reproduction selection switches SW 1 , SW | 2 of the recording signal S R are driven. Optionally, the recording and playback heads H RP1 and H RP2 are driven to input and output the video signals V IN and V OUT . The recording signal S R is a resistor R 1 and a diode D 1 . The transistor Q 1 is turned on to drive the erase head H E , and the recording signal S R is recorded by the recording and playback head H RP1 , by a delay circuit composed of a resistor R 2 and a capacitor C. When the capacitor C is fully charged after the driving of H RP2 ) is temporarily charged, the transistor Q 2 is turned on to turn on the transistors Q 3 and Q 4 to drive the recording / playback heads H RP1 and H RP2 . An initial screen stabilization circuit of a video tape, characterized in that it is intended to be.
KR2019880018591U 1988-11-15 1988-11-15 Initial picture stabilization circuit for vtr KR930006884Y1 (en)

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KR2019880018591U KR930006884Y1 (en) 1988-11-15 1988-11-15 Initial picture stabilization circuit for vtr

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KR930006884Y1 true KR930006884Y1 (en) 1993-10-09

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