KR970012468A - Double speed playback mode judgment circuit of video cassette recorder - Google Patents

Double speed playback mode judgment circuit of video cassette recorder Download PDF

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Publication number
KR970012468A
KR970012468A KR1019950027017A KR19950027017A KR970012468A KR 970012468 A KR970012468 A KR 970012468A KR 1019950027017 A KR1019950027017 A KR 1019950027017A KR 19950027017 A KR19950027017 A KR 19950027017A KR 970012468 A KR970012468 A KR 970012468A
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KR
South Korea
Prior art keywords
circuit
mode
double speed
signal
detecting
Prior art date
Application number
KR1019950027017A
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Korean (ko)
Inventor
곽철원
Original Assignee
배순훈
대우전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019950027017A priority Critical patent/KR970012468A/en
Publication of KR970012468A publication Critical patent/KR970012468A/en

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Abstract

본 발명은 8mm 및 Hi-8mm 자기테이프가 로딩 가능한 일반 8mm용 VCR에서 특수 재생 모드 시에 배속 모드를 검출하는 회로로서, 헤드(H)에 검출된 영상 신호의 엔펠로프 파형을 검출하는 회로로서, 헤드(H)에 검출된 영상 신호의 엔벨로프 파형을 검출하는 검출회로(1)와; 입력되는 스위칭 신호에 따라 구동하여 상기 검출 회로의 엔벨로프 파형의 전압 레벨을 변동시켜 출력하는 레벨 변환 회로(2)와; 상기 레벨 변환 회로(2)로부터 인가되는 전압 레벨에 따라 배속 모드를 판단하여 모드 신호를 출력하는 모드 판단 회로 (3)와; 상기Hi-8mm의 자기 테이프가 장착될 때에 스위칭 신호를 출력하며, 상기 모드판단회로(3)로부터 인가되는 상기 모드 신호에 따라 상기 배속 모드를 판단하여 상기 배속 모드에 대응하는 회전 신호를 출력하는 제어 회로(4)와; 상기 제어 회로(4)의 회전 신호에 대응하는 배속으로 테이프를 주행시키는 캡스턴 모터(5)를 구비한다. 따라서, 본 발명은 8mm용 VCR에서Hi-8mm용 테이프의 신호를 특수 재생시키는 경우에 그 엔벨로프 파형의 직류 레벨을 보상하여 준 후에 그 배속 모드를 판단함으로써, 배속 모드를 정확하게 판단할 수 있다는 효과가 있다.The present invention is a circuit for detecting a double speed mode in a special playback mode in a general 8mm VCR that can be loaded with 8mm and Hi-8mm magnetic tapes. A detection circuit (1) for detecting an envelope waveform of the video signal detected by the head (H); A level converting circuit (2) for driving in accordance with an input switching signal to vary and output a voltage level of an envelope waveform of the detecting circuit; A mode judging circuit (3) for judging a double speed mode according to the voltage level applied from said level converting circuit (2) and outputting a mode signal; A switching signal is output when the magnetic tape of the Hi-8mm is mounted, and the control mode determines the double speed mode according to the mode signal applied from the mode determining circuit 3 and outputs a rotation signal corresponding to the double speed mode. Circuit 4; The capstan motor 5 which drives a tape at the double speed corresponding to the rotation signal of the said control circuit 4 is provided. Therefore, when the signal of the Hi-8mm tape is specially reproduced in the 8mm VCR, the present invention has the effect of accurately determining the double speed mode by determining the double speed mode after compensating the DC level of the envelope waveform. have.

Description

비디오카세트 레코드의 배속 재생 모드 판단 회로Double speed playback mode judgment circuit of video cassette record

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

도면은 본 발명은 따른 비디오카세트 레코드의 배속 재생 모드 판단 회로도.Figure 2 is a circuit diagram of a double speed playback mode determination of a video cassette record according to the present invention.

Claims (2)

8mm 및 Hi-8mm 자기테이프가 로딩 가능한 일반 8mm용 VCR시에 특수 재생 모드에서 배속 모드를 검출하는 회로로서, 헤드(H)에 검출된 영상 신호의 엔벨로프 파형을 검출하는 검출 회로(1)와; 입력되는 스위칭 신호에 따라 구동하여 상기 검출 회로의 엔벨로프 파형의 전압 레벨을 변동시켜 출력하는 레벨 변환 회로(2)와; 상기 레벨 변환 회로(2)로부터 인가되는 전압 레벨에 따라 배속 모드를 판단하여 모드 신호를 출력하는 모드 판단 회로(3)와; 상기 Hi-8mm의 자기테이프가 장착될때에 스위칭 신호를 출력하여, 상기 모드판단회로(3)부터 인가되는 상기 모드 신호에 따라 상기 배속 모드를 판단하여 상기 배속 모드에 대응하는 회전 신호를 출력하는 제어 회로(4)와; 상기 제어 회로(4)의 회전 신호에 대응하는 배속으로 테이프를 주행시키는 캡스턴 모터(5)를 구비하는 비디오카세트 레코드의 배속 재생 모드 판단 회로.1. A circuit for detecting a double speed mode in a special playback mode in a general 8 mm VCR capable of loading 8 mm and Hi-8 mm magnetic tapes, comprising: a detection circuit 1 for detecting an envelope waveform of a video signal detected by a head H; A level converting circuit (2) for driving in accordance with an input switching signal to vary and output a voltage level of an envelope waveform of the detecting circuit; A mode determination circuit (3) for judging a double speed mode according to the voltage level applied from the level conversion circuit (2) and outputting a mode signal; A control signal for outputting a switching signal when the magnetic tape of the Hi-8mm is mounted, determining the speed mode according to the mode signal applied from the mode determining circuit 3, and outputting a rotation signal corresponding to the speed mode Circuit 4; A double speed reproduction mode determination circuit of a video cassette record having a capstan motor (5) for driving a tape at a double speed corresponding to a rotation signal of said control circuit (4). 제1항에 있어서, 상기 레벨 변환 회로(3)는, 상기 검출 회로(1)에 연결되는 바이어스용 저항(R1,R2)와; 상기 바이어스용 저항(R1,R2)에 연결된 증폭용 트랜지스터(Q1)와; 상기 트랜지스터(Q1)에 연결되는 전압 분배용 저항(R3,R4)과; 상기 제어 회로(4)의 스위칭 신호에 따라 구동하는 스위칭용 트랜지스터(Q2)와; 상기 트랜지스터(Q1,Q2) 사이에 연결된 전압 분배용 저항(R5)을 구비하는 비디오카세트 레코드의 배속 재생 모드 판단 회로.2. The circuit according to claim 1, wherein said level converting circuit (3) comprises: bias resistors (R1, R2) connected to said detecting circuit (1); An amplifying transistor Q1 connected to the bias resistors R1 and R2; Voltage distribution resistors R3 and R4 connected to the transistor Q1; A switching transistor (Q2) for driving in accordance with the switching signal of the control circuit (4); A double speed reproduction mode determination circuit of a video cassette record having a voltage distribution resistor (R5) connected between the transistors (Q1, Q2). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950027017A 1995-08-29 1995-08-29 Double speed playback mode judgment circuit of video cassette recorder KR970012468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950027017A KR970012468A (en) 1995-08-29 1995-08-29 Double speed playback mode judgment circuit of video cassette recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950027017A KR970012468A (en) 1995-08-29 1995-08-29 Double speed playback mode judgment circuit of video cassette recorder

Publications (1)

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KR970012468A true KR970012468A (en) 1997-03-29

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KR1019950027017A KR970012468A (en) 1995-08-29 1995-08-29 Double speed playback mode judgment circuit of video cassette recorder

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020017380A (en) * 2000-08-30 2002-03-07 구자홍 Apparatus for controlling capstan motor of tvcr

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020017380A (en) * 2000-08-30 2002-03-07 구자홍 Apparatus for controlling capstan motor of tvcr

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