KR970019498A

KR970019498A - Input signal broadcasting mode discrimination circuit of composite video equipment

Info

Publication number: KR970019498A
Application number: KR1019950030929A
Authority: KR
Inventors: 강봉순; 곽말섭
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1995-09-20
Filing date: 1995-09-20
Publication date: 1997-04-30

Abstract

본 발명은 입력되는 영상 신호의 레벨과 기존 레벨을 비교하여 이에 해당된 데이터를 출력하는 레벨 검출 수단과, 상기 레벨 검출 수단에서 출력된 데이터의 레벨을 일정 기간 비교하여 입력 신호의 방송모드를 판단하는 방송 모드 판별 수단과, 상기 방송 모드 판별 수단에서 출력되는 데이터에 따라 방송 방식 선택 신호를 출력하는 방송 방식 선택 신호 출력 수단으로 이루어져, 재생된 영상 신호의 R-Y색차신호의 레벨 변화를 검출하여 입력되는 영상 신호의 방송 모드를 판단하여 복조회로의 작동을 방송 방식에 따라 선택 제어하므로 PAL 방식으로 기록된 영상 신호를 NTSC 모드로 재생하더라도 자동으로 복합영상기기의 복조회로 모드가 PAL 모드로 절환되어 재생되므로 화질이 떨어지는 종래의 문제점을 개선하는 복합 영상 기기의 입력 신호 방송 모드 판별 회로에 관한 것이다.The present invention compares a level of an input video signal with an existing level and outputs data corresponding thereto, and compares a level of data output from the level detecting means for a predetermined period to determine a broadcast mode of the input signal. A broadcast mode selection means and a broadcast mode selection signal output means for outputting a broadcast mode selection signal according to the data output from the broadcast mode discrimination means, and detecting and changing a level of the RY color difference signal of the reproduced video signal. Since the broadcasting mode of the signal is judged and the operation of the demodulation circuit is selectively controlled according to the broadcasting method, the demodulation circuit mode of the composite video device is automatically switched to the PAL mode even when the video signal recorded in the PAL method is played in NTSC mode. Therefore, the input signal broadcasting module of the composite video device improves the conventional problem of poor image quality. It relates to the determination circuit.

Description

Input signal broadcasting mode discrimination circuit of composite video equipment

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

제1도는 본 발명에 의한 복합 영상 기기의 입력 신호 방송 모드 판별 회로를 나타낸 블록도,1 is a block diagram showing an input signal broadcasting mode discrimination circuit of a composite video apparatus according to the present invention;

제2도는 제1도에 도시된 레벨 검출 수단의 작동을 설명하는 파형도,FIG. 2 is a waveform diagram illustrating the operation of the level detecting means shown in FIG.

제3도는 제1도에 도시된 방송 모드 판별 수단의 작동 원리를 나타낸 표.3 is a table showing the principle of operation of the broadcast mode discriminating means shown in FIG.

Claims

Level detection means for comparing the level of the input video signal and the existing level to output the corresponding data, and the broadcast mode discrimination to determine the broadcast mode of the input signal by comparing the level of the data output from the level detection means for a predetermined period Means and a broadcast mode selection signal output means for outputting a broadcast mode selection signal in accordance with the data output from the broadcast mode discriminating means.

2. The input signal broadcasting mode of claim 1, wherein the level detecting means is an RY color difference signal which is compared with a reference level TH supplied externally in synchronization with a period of an image signal. Discrimination circuit.

The composite image device according to claim 2, wherein the broadcast mode determination unit is configured to determine that the PAL broadcast mode is output when the level of the data output from the level detection unit is regularly inverted per cycle, and output the corresponding data. Input signal broadcasting mode discrimination circuit.

4. The composite video apparatus according to claim 3, wherein the broadcast method selection signal output means comprises an up / down counter for outputting a broadcast method selection signal by inverting the most significant bit according to the data output from the broadcast mode determination means. Input signal broadcasting mode determination circuit.

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