KR930022280A

KR930022280A - VCR recording current automatic adjustment circuit

Info

Publication number: KR930022280A
Application number: KR1019920007122A
Authority: KR
Inventors: 이수영
Original assignee: 이헌조; 주식회사 금성사
Filing date: 1992-04-27
Publication date: 1993-11-23

Abstract

본 발명은 VCR테이프에 기록되는 REC-Y 신호 및 REC-C 신호를 자동으로 가변되도록 하여 기록 전류 조정을 자동으로 실현할 수 있도록 한 VCR의 기록 전류 자동 조정회로에 관한 것으로, 종래에는 기록 전류를 수동으로 조정하므로 부정확하고 입력 비디오 신호의 레벨에 따라 기록전류가 변동하는 결점이 있었으나, 본 발명에서는 REC-Y 신호 및 REC-C 신호를 자동으로 가변할 수 있는 회로를 각각 구성하여 기록 전류 조정을 자동으로 할 수 있도록 하므로써 상기 결점을 개선시킬 수 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording current automatic adjustment circuit of a VCR that automatically realizes recording current adjustment by automatically varying the REC-Y signal and the REC-C signal recorded on the VCR tape. Although it was inaccurate and the recording current fluctuated according to the level of the input video signal, the present invention configures a circuit capable of automatically varying the REC-Y signal and the REC-C signal. By making it possible, the above-mentioned defect can be improved.

Description

VCR recording current automatic adjustment circuit

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

제2도는 본 발명 VCR의 자동 기록 전류 조정을 나타낸 회로도.2 is a circuit diagram showing automatic write current adjustment of a VCR of the present invention.

제3도는 제2도에 따른 출력 파형도.3 is an output waveform diagram according to FIG.

Claims

An amplifying unit 1 for amplifying each REC-Y signal and a REC-C signal according to a power supply of a switching unit, a signal processing unit 4 for converting a signal of the amplifying unit 1 into a constant signal; A comparator 5 for comparing the signal of the signal processor 4 with a set signal, a micom 6 sequentially generating signals until the signal of the comparator 5 becomes zero, and the micom 6 And a switching unit 7 for generating power in response to a signal of a), and mixing the mixer 30 to mix the REC-Y signal and the REC-C signal so that the tape 31 is recorded with a desired recording current. Automatic adjustment circuit for the recording current of the VCR.

2. The signal processing unit (4) according to claim 1, wherein the signal processing unit (4) includes an envelope detector and an A / D converter (2) for detecting and digitalizing an envelope, and an average value for averaging the digital data for one period of head switching and converting the digital data into a constant signal. A write current automatic adjustment circuit for a VCR, comprising a calculator and a D / A converter (3).

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