KR970029597A

KR970029597A - Automated Quality Correction Circuit

Info

Publication number: KR970029597A
Application number: KR1019950046566A
Authority: KR
Inventors: 김정호
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-11-30
Filing date: 1995-11-30
Publication date: 1997-06-26

Abstract

본 발명은 현재의 테이프의 상태에 따라 화질을 자동으로 보정하는 자동화질 보정회로에 관한 것으로서, 특히 비데오 헤드에서 재생된 미약한 재생신호를 증폭하여 고주파 신호를 검출하는 증폭부와, 상기 증폭부에서 검출된 고주파 신호에서 엔벨로프를 검출하는 엔벨로프 검출부와, 상기 엔벨로프 검출부에 연결되어 시시각각으로 변화하는 에벨로프 신호의 전압을 필요한 타이밍으로 샘플링하여 그 순간의 순시값을 아날로그 메모리에 홀드시키는 샘플&홀드부와, 상기 샘플&홀드부에서 출력되는 샘플링 값을 검출하고 검출된 DC값에 따라 화질을 자동으로 보정하는 화질 보정부로 구성되어, 테이프의 재생시 엔벨로프의 DC량을 검출하여 현재의 테이프의 상태를 판별하고 판별된 테이프의 상태에 따라 화질을 자동으로 보정하고, 또한 테이프의 상태가 변하면 자동으로 그에 맞는 화질 보정을 함으로써, 소비자에게 편리함을 주면서 소비자는 항상 최적의 화면을 볼 수 있다.The present invention relates to an automatic quality correction circuit for automatically correcting image quality according to a current tape state. The present invention relates to an amplification unit for detecting a high frequency signal by amplifying a weak reproduction signal reproduced from a video head. An envelope detector for detecting an envelope from the detected high frequency signal, and a sample & hold unit connected to the envelope detector to sample the voltage of the envelope signal that changes every moment at a necessary timing, and to hold the instantaneous value at an instant in an analog memory; And an image quality correction unit for detecting a sampling value output from the sample and hold unit and automatically correcting the image quality according to the detected DC value. The current state of the tape is detected by detecting the DC amount of the envelope at the time of playing the tape. Determine and automatically correct the image quality according to the determined state of the tape, and also By changing the image quality automatically, the user can always see the optimal screen while giving convenience to the consumer.

Description

Automated Quality Correction Circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명에 따른 자동화질 보정회로의 블럭도.2 is a block diagram of an automated quality correction circuit according to the present invention.

제3도는 상기 제2도의 홀드부의 상세 회로도.3 is a detailed circuit diagram of the hold portion of FIG. 2.

Claims

An amplification unit for amplifying a weak reproduction signal reproduced by a video head to detect a high frequency signal, an envelope detection unit for detecting an envelope from the high frequency signal detected by the amplification unit, and an envelope signal connected to the envelope detection unit to change at an instant A sample & hold section for sampling the voltage at the required timing and holding the instantaneous value in the analog memory, and a sampling value output from the sample & hold section, and automatically correcting the image quality according to the detected DC value. Automated quality correction circuit composed of image quality correction unit.

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