KR890011381A - Station detection circuit - Google Patents

Station detection circuit Download PDF

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Publication number
KR890011381A
KR890011381A KR1019870015622A KR870015622A KR890011381A KR 890011381 A KR890011381 A KR 890011381A KR 1019870015622 A KR1019870015622 A KR 1019870015622A KR 870015622 A KR870015622 A KR 870015622A KR 890011381 A KR890011381 A KR 890011381A
Authority
KR
South Korea
Prior art keywords
horizontal synchronization
output
nand gate
synchronization
circuit
Prior art date
Application number
KR1019870015622A
Other languages
Korean (ko)
Other versions
KR910005746B1 (en
Inventor
심순선
Original Assignee
안시환
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 안시환, 삼성전자 주식회사 filed Critical 안시환
Priority to KR1019870015622A priority Critical patent/KR910005746B1/en
Publication of KR890011381A publication Critical patent/KR890011381A/en
Application granted granted Critical
Publication of KR910005746B1 publication Critical patent/KR910005746B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/05—Synchronising circuits with arrangements for extending range of synchronisation, e.g. by using switching between several time constants

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

내용 없음No content

Description

스테이션 검출회로Station detection circuit

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

도면은 본 발명의 실시예에 따른 회로도.Figure is a circuit diagram according to an embodiment of the present invention.

Claims (1)

튜너 디모듈레이터에 인가되는 비데어신호를 수평동기 분리회로(1)와, 비데오처리부(8)를 통해 RF모듈레이터(9)에 각각 인가하고, 수평동기 분리회로(1)에서 분리된 수평동기를 AFC회로(2)에 인가하여 트리거시킴과 동시에 낸드게이트(5)의 한입력에 인가하며, 가변저항(VR1)에 의해 주파수가 결정되는 수평동기발생부(3)에서 출력되는 수평동기가 동기정형부(4)의 가변저항(VR2) 및 콘덴서(2)에 의해 미분되고 다이오드(D1)에 의해 네가티브 부분을 클램프한 다음 인버어터(Q1,Q2)를 통해 반전시켜 완전한 수평동기가 출력되는 동기정형부(4)의 출력을 낸드게이트(5)의 다른 입력에 인가하며, 낸드게이트(5)의 출력을 지역통과필터(6)를 통해 디지탈화 하여 마이크로 컴퓨터(7)에 인가하여서, 마이크로 컴퓨터(7)가 이상태를 판정하여 채널메모리 및 채널서어치기능을 수행하는 것을 특징으로 하는 스테이션 검출회로.The video signal applied to the tuner demodulator is applied to the RF modulator 9 through the horizontal synchronization separating circuit 1 and the video processing unit 8, and the horizontal synchronization separated from the horizontal synchronization separating circuit 1 is an AFC circuit. (2) is applied to one input of the NAND gate 5 at the same time as the trigger, and the horizontal synchronization output from the horizontal synchronization generator (3) whose frequency is determined by the variable resistor (VR1) synchronization synchronization unit ( 4) A synchronous molding part which is differentiated by the variable resistor VR2 and the condenser 2, clamped by the diode D1, and then inverted through the inverters Q1 and Q2 to output complete horizontal synchronization. The output of 4) is applied to the other input of the NAND gate 5, and the output of the NAND gate 5 is digitalized through the area pass filter 6 and applied to the microcomputer 7 so that the microcomputer 7 This state is judged to enable the channel memory and channel search functions. And a station detection circuit. ※ 참고사항：최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019870015622A 1987-12-31 1987-12-31 Station detection circuit KR910005746B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019870015622A KR910005746B1 (en) 1987-12-31 1987-12-31 Station detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019870015622A KR910005746B1 (en) 1987-12-31 1987-12-31 Station detection circuit

Publications (2)

Publication Number Publication Date
KR890011381A true KR890011381A (en) 1989-08-14
KR910005746B1 KR910005746B1 (en) 1991-08-02

Family

ID=19267880

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019870015622A KR910005746B1 (en) 1987-12-31 1987-12-31 Station detection circuit

Country Status (1)

Country Link
KR (1) KR910005746B1 (en)

Also Published As

Publication number Publication date
KR910005746B1 (en) 1991-08-02

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