KR970012468A - Double speed playback mode judgment circuit of video cassette recorder - Google Patents
Double speed playback mode judgment circuit of video cassette recorder Download PDFInfo
- 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
- Authority
- KR
- South Korea
- Prior art keywords
- circuit
- mode
- double speed
- signal
- detecting
- Prior art date
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- Television Signal Processing For Recording (AREA)
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
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)
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)
Publication Number | Publication Date |
---|---|
KR970012468A true KR970012468A (en) | 1997-03-29 |
Family
ID=66596198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019950027017A KR970012468A (en) | 1995-08-29 | 1995-08-29 | Double speed playback mode judgment circuit of video cassette recorder |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR970012468A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20020017380A (en) * | 2000-08-30 | 2002-03-07 | 구자홍 | Apparatus for controlling capstan motor of tvcr |
-
1995
- 1995-08-29 KR KR1019950027017A patent/KR970012468A/en not_active Application Discontinuation
Cited By (1)
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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WITN | Withdrawal due to no request for examination |