KR960043824A

KR960043824A - TV's automatic fine tuning circuit

Info

Publication number: KR960043824A
Application number: KR1019950013203A
Authority: KR
Inventors: 박범진
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-05-25
Filing date: 1995-05-25
Publication date: 1996-12-23

Abstract

본 발명은 텔레비젼 수상기의 자동미조정(AFT)회로에 관한 것으로, 영상중간주파신호를 복조하여 RGB영상신호를 출력함과 동시에 AFT전압과 동기검출신호를 출력하며, 콘트롤 레지스터(20)를 구비하여 상기 콘트롤 레지스터(20)에 설정된 데이타에 따라 상기 가변용량수단의 용량을 가변시키는 비디오 프레세서(13)와; 상기 비디오 프로세서로부터 동기검출신호(ID)와 AFT전압을 입력한 후 소정의 스퀀스에 따라 상기 AFT전압을 판단하여 상기 AFT탱크회로가 영상중간주파수에 동조되도록 상기 콘트롤 레지스터(20)의 데이타를 가변시키는 마이콤(16)으로 구성되어 방송방식이 틀려 동조주파수가 틀어진 경우에도 자동으로 동조주파수를 맞춰주므로 작업이 용이하고 사용이 편리한 효과가 있다.The present invention relates to an automatic fine-tuning (AFT) circuit of a television receiver, and demodulates a video intermediate frequency signal to output an RGB video signal, at the same time to output an AFT voltage and a synchronous detection signal, and includes a control register 20. A video processor (13) for varying the capacity of the variable capacity means in accordance with the data set in the control register (20); After inputting the sync detection signal ID and the AFT voltage from the video processor, the AFT voltage is determined according to a predetermined sequence, and the data of the control register 20 is varied so that the AFT tank circuit is tuned to the image intermediate frequency. It is composed of a microcomputer 16 to adjust the tuning frequency automatically even if the tuning frequency is wrong because of the broadcast method is easy to work and has an easy to use effect.

Description

TV's automatic fine tuning circuit

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

제 3 도는 (가)는 일반적인 동기검출(ID) 전압을 도시한 그래프, 제 3 도의 (나)는 일반적인 자동미조정(AFT)전압을 도시한 그래프, 제 4 도는 본 발명에 딸 자동미조정(AFT)을 수행하는 흐름을 도시한 흐름도이다.3 is a graph showing a typical synchronous detection (ID) voltage, FIG. 3 is a graph showing a general automatic fine tuning (AFT) voltage, and FIG. 4 is a graph of automatic fine tuning according to the present invention. A flow diagram illustrating the flow of performing AFT).

Claims

In a television having an AFT tank circuit having an AFT coil 14 having a fixed inductance value and a variable capacitance means capable of varying the tuning frequency according to the image intermediate frequency input from the tuner 11, the image intermediate frequency signal Demodulates an RGB image signal and simultaneously outputs an AFT voltage and a synchronous detection signal, and includes a control register 20 to vary the capacity of the variable capacitance means according to data set in the control register 20. A processor 13; After inputting the sync detection signal ID and the AFT voltage from the video processor, the AFT voltage is determined according to a predetermined sequence, and the data of the control register 20 is varied so that the AFT tank circuit is tuned to the image intermediate frequency. An automatic fine tuning circuit of a television composed of a microcomputer (16).

2. The automatic fine tuning circuit of claim 1, wherein the video processor (13) and the microcomputer (16) are connected by an I ² C bus to transmit data.

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