KR940008462A

KR940008462A - VRT playback screen quality stabilization circuit

Info

Publication number: KR940008462A
Application number: KR1019920017276A
Authority: KR
Inventors: 김영길
Original assignee: 이헌조; 주식회사 금성사
Priority date: 1992-09-22
Filing date: 1992-09-22
Publication date: 1994-04-29

Abstract

본 발명은 브이씨알 재생화면 화질 안정화 회로에 관한 것으로, 종래회로는튜너 모드시 튜너 신호와 라인신호의 간섭을 방지하기 위해서 상기 무신호가 출력되면 비디오 신호 뮤트를 시켜주는 모드 간섭에 관한 회로만 있어서 노이즈 신호가 색신호로 인식되어 판별에러가 발생되며 색신호가 지연되고 뮤트되는 문제점이 있었다. 본 발명은 이와같은 종래 회로의 문제점을 감안하여 비디오 테이프 재생초기에 발생하는 검출에러에 의한 컬러(Color)무감현상 및 색상이 위조되는 것을 방지하기 위하여 버스트 게이트 펄스신호를 이용하여 노이즈를 뮤트시킴으로써 재생화면을 안정시킨 브이씨알 재생화면 화질 안정화 회로를 창안한 것이다.The present invention relates to a BCD playback picture quality stabilization circuit, and the conventional circuit is only in a circuit related to the mode interference to mute the video signal when the signal is output to prevent the interference of the tuner signal and the line signal in the tuner mode noise There is a problem in that the signal is recognized as a color signal and a discrimination error occurs and the color signal is delayed and muted. In view of the problems of the conventional circuit, the present invention reproduces by muting the noise using a burst gate pulse signal in order to prevent color insensitivity and color forgery due to a detection error occurring at the beginning of videotape playback. It is the invention of a stabilized picture quality stabilization circuit.

Description

VRT playback screen quality stabilization circuit

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

제2도는 본 발명 브이씨알 재생화면 화질 안정화 회로의 블럭도.2 is a block diagram of the VR playback picture quality stabilization circuit of the present invention.

제3도는 제2도 동기 분리부 각 지점의 파형도.3 is a waveform diagram of each point of FIG.

제4도는 제2도의 판별부 각 지점의 파형도.4 is a waveform diagram of each point of the discriminating unit of FIG. 2;

제5도는 버스트 게이트 펄스 뮤트 파형도.5 is a burst gate pulse mute waveform diagram.

Claims

A switch 21 for switching between a tuner video signal and a line video signal, and a synchronization separator 22 for separating the synchronization signal included in the tuner video signal input when the switch 21 is switched to the terminal TU. And a video signal muting unit 31 for preventing interference of the tuner / line signal when the signal is not inputted to the tuner, and a tuner video signal output from the switch 21 is separated from the sync signal included in the line video signal. A luminance / color signal section 46 for processing and erasing color signals in accordance with a control signal input from the discriminating section, a delay section 35 for delaying the synchronous signal output separately from the luminance / color signal section 46, A signal input from the delay unit 35 and a color unit 41 for receiving the color signal from the luminance / color signal unit 46 and discriminating the arm / secam signal, and a synchronization signal and the input from the luminance / color signal unit 46. If not, sync signal or burst gate V CR playback display image quality stabilization circuit, characterized in that the noise consists of a mute unit 36 for muting switch and noise.

※ Note: The disclosure is based on the initial application.