KR960019971A - AFT control method and apparatus - Google Patents

AFT control method and apparatus Download PDF

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Publication number
KR960019971A
KR960019971A KR1019940029497A KR19940029497A KR960019971A KR 960019971 A KR960019971 A KR 960019971A KR 1019940029497 A KR1019940029497 A KR 1019940029497A KR 19940029497 A KR19940029497 A KR 19940029497A KR 960019971 A KR960019971 A KR 960019971A
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KR
South Korea
Prior art keywords
voltage
signal
aft
tuning
data value
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Application number
KR1019940029497A
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Korean (ko)
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KR0134264B1 (en
Inventor
류우태
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배순훈
대우전자 주식회사
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Priority to KR94029497A priority Critical patent/KR0134264B1/en
Publication of KR960019971A publication Critical patent/KR960019971A/en
Application granted granted Critical
Publication of KR0134264B1 publication Critical patent/KR0134264B1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading

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  • Television Receiver Circuits (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

본 발명은 마이컴을 이용하여 AFT 동작을 제어하는 AFT 제어방법에 관한 것으로, AFT 대역의 확장 및 안정된 동작을 보장하기 위한 것이다.The present invention relates to an AFT control method for controlling an AFT operation using a microcomputer, and to ensure the expansion and stable operation of an AFT band.

이를 위해 본 발명은 전압 분배용 제1, 제2저항과; 제1, 제2저항으로부터 인가되는 전압을 AFT 전압으로 하고, 입력되는 튜닝 전압에 따라 튜닝되어 소정의 IF 신호를 출력하는 튜너와; 튜너부로부터 인가되는 IF 신호를 처리하여 영상 검파 신호 및 AFT 전압을 출력하는 IF 신호 처리 회로와; IF 신호 처리 회로로부터 인가되는 영상 검파 신호로부터 동기 신호를 검출하여 출력하는 동기 검출 회로와; IF 신호 처리 회로의 AFT 전압 및 동기 검출 회로의 동기 신호에 따라 소정의 PWM 신호를 출력하는 마이컴과; 마이컴의 PWM 신호를 적분하여 튜닝 전압으로써 튜너에 인가하는 적분회로를 포함한다. 튜닝 상태에서 튜닝 전압을 변화시키면서 튜닝점을 검출하는 튜닝점 검출단계, 검출된 튜닝점에서의 PWM 데이타값을 저장하는 PWM 데이타값 저장단계, 및 국부 발진 주파수의 변동에 의한 AFT 전압이 기준 전압(Vref(+), Vref(-))내에 오도록 저장된 PWM 데이타 값을 변경하여 튜닝 전압을 변경하는 PWM 데이타 값 변경단계에 의해 수행된다.To this end, the present invention is the first and second resistors for voltage distribution; A tuner for setting a voltage applied from the first and second resistors as an AFT voltage and tuning the input voltage according to an input tuning voltage to output a predetermined IF signal; An IF signal processing circuit for processing an IF signal applied from the tuner unit to output an image detection signal and an AFT voltage; A synchronization detection circuit for detecting and outputting a synchronization signal from an image detection signal applied from an IF signal processing circuit; A microcomputer outputting a predetermined PWM signal in accordance with the AFT voltage of the IF signal processing circuit and the synchronization signal of the synchronization detection circuit; An integration circuit for integrating the microcomputer PWM signal and applying it to the tuner as a tuning voltage. A tuning point detecting step of detecting a tuning point while varying the tuning voltage in the tuning state, a PWM data value storing step of storing a PWM data value at the detected tuning point, and an AFT voltage caused by a change in the local oscillation frequency is defined as a reference voltage. It is performed by the PWM data value changing step of changing the tuning voltage by changing the stored PWM data value to be within Vref (+) and Vref (-)).

따라서 본 발명은 마이컴의 PWM 데이타값 변경으로 AFT 대역의 확장이 용이하고, VHF 대역과 UHF 대역에서도 거의 유사한 AFT 대역폭을 얻을 수 있는 효과가 있다.Therefore, the present invention can easily extend the AFT band by changing the PWM data value of the microcomputer, and can obtain an almost similar AFT bandwidth in the VHF band and the UHF band.

Description

에이 에프 티(AFT) 제어 방법 및 장치AFT control method and apparatus

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

제3도는 본 발명에 따른 튜닝 계통도,3 is a tuning diagram according to the present invention,

제4도는 본 발명에 따른 AFT 제어방법의 흐름도.4 is a flowchart of an AFT control method according to the present invention.

Claims (2)

튜닝 전압을 변화시키면서 튜닝점을 검출하는 튜닝점 검출단계와; 상기 검출된 튜닝점에서의 PWM 데이타 값을 저장하는 PWM 데이타값 저장단계와; 국부 발진 주파수의 변동에 의한 AFT 전압이 기준 전압내에 오도록 저장된 PWM 데이타 값을 변경하는 PWM 데이타값 변경 단계를 포함하는 에이 에프 티 제어방법.A tuning point detecting step of detecting a tuning point while varying the tuning voltage; A PWM data value storing step of storing the PWM data value at the detected tuning point; And a PWM data value changing step of changing a stored PWM data value such that an AFT voltage due to a variation of a local oscillation frequency is within a reference voltage. 전압 분배용 제1,2 저항과; 상기 제1, 제2저항으로부터 인가되는 전압을 AFT 전압으로 하고, 입력되는 튜닝 전압에 따라 튜닝되어 소정의 IF 신호를 출력하는 튜너와; 상기 튜너로부터 인가되는 IF 신호를 처리하여 영상 검파 신호 및 AFT 전압을 출력하는 IF 신호 처리 회로와; 상기 IF 신호 처리 회로로부터 인가되는 상기 영상 검파 신호로부터 동기 신호를 검출하여 출력하는 동기 검출 회로와; 상기 IF 신호 처리 회로의 AFT 전압 및 동기 검출 회로의 동기 신호에 따라 소정의 PWM 신호를 출력하는 마이컴과; 상기 마이컴의 PWM 신호를 적분하여 튜닝 전압으로서 상기 튜너에 인가되는 적분 회로를 포함하는 AFT 제어 장치.First and second resistors for voltage distribution; A tuner for setting a voltage applied from the first and second resistors as an AFT voltage and tuning the input voltage to output a predetermined IF signal; An IF signal processing circuit for processing an IF signal applied from the tuner and outputting an image detection signal and an AFT voltage; A synchronization detection circuit for detecting and outputting a synchronization signal from the image detection signal applied from the IF signal processing circuit; A microcomputer outputting a predetermined PWM signal according to the AFT voltage of the IF signal processing circuit and the synchronization signal of the synchronization detection circuit; And an integration circuit which integrates the PWM signal of the microcomputer and is applied to the tuner as a tuning voltage. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR94029497A 1994-11-11 1994-11-11 Auto fine tunning control method and apparatus KR0134264B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR94029497A KR0134264B1 (en) 1994-11-11 1994-11-11 Auto fine tunning control method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR94029497A KR0134264B1 (en) 1994-11-11 1994-11-11 Auto fine tunning control method and apparatus

Publications (2)

Publication Number Publication Date
KR960019971A true KR960019971A (en) 1996-06-17
KR0134264B1 KR0134264B1 (en) 1998-04-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100248139B1 (en) * 1997-06-17 2000-03-15 전주범 Automatic fine tuning

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100248139B1 (en) * 1997-06-17 2000-03-15 전주범 Automatic fine tuning

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Publication number Publication date
KR0134264B1 (en) 1998-04-29

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