KR920017446A - Image signal intermediate frequency processing system - Google Patents

Image signal intermediate frequency processing system Download PDF

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Publication number
KR920017446A
KR920017446A KR1019910003294A KR910003294A KR920017446A KR 920017446 A KR920017446 A KR 920017446A KR 1019910003294 A KR1019910003294 A KR 1019910003294A KR 910003294 A KR910003294 A KR 910003294A KR 920017446 A KR920017446 A KR 920017446A
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KR
South Korea
Prior art keywords
section
output
image
processing system
video signal
Prior art date
Application number
KR1019910003294A
Other languages
Korean (ko)
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KR940006172B1 (en
Inventor
정순길
Original Assignee
김광호
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.)
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Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019910003294A priority Critical patent/KR940006172B1/en
Publication of KR920017446A publication Critical patent/KR920017446A/en
Application granted granted Critical
Publication of KR940006172B1 publication Critical patent/KR940006172B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/52—Automatic gain control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G2201/00—Indexing scheme relating to subclass H03G
    • H03G2201/30—Gain control characterized by the type of controlled signal
    • H03G2201/305—Gain control characterized by the type of controlled signal being intermediate frequency signal

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

내용 없음No content

Description

영상신호 중간주파 처리시스템Image signal intermediate frequency processing system

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

제2도는 본 발명의 중간주파 처리 시스템의 구성도,2 is a block diagram of an intermediate frequency processing system of the present invention,

제3도는 제2도의 영상 자동이득제어부의 내부회로도,3 is an internal circuit diagram of an image automatic gain control unit of FIG.

제4도는 제3도의 시뮬레이션 결과도.4 is a simulation result of FIG.

Claims (2)

수신된 영상신호는 튜너부(1') 및 SAW필터부(2')를 통해 IF앰프부(3')에서 증폭되고 NSC부 및 자동위상조절부(8')에서 위상이 조정되며 지역필터부(9')를 통해 전압조정발진부(10')에서 발진하고 상기 자동위상조절부(8')에서 변조된 입력 영상신호주파수와 발진주파수의 위상차를 검출하여 얻은 제어전압에 의해서 조정발진된 전압조정발진부(10') 출력을 영상검파부(4')의 멀티플라이어 상단에 입력시켜 영상중간 주파신호로부터 합성영상신호를 꺼내고 증폭된 신호를 안정된 영상신호가 출력되도록 IF 자동이득제어부(12')에 궤환시켜 자동이득제어전압을 발생시켜 IF앰프부(3')의 이득을 조정하고 B/W NC부(14')에서 잡음성분을 제거하여 안정된 영상신호가 출력되는 종래의 중간주파 처리시스템에 있어서, 상기 B/W NC부(14')의 출력 잡음이 제거된 종합 영상신호의 일단을 입력으로 하여 이득조절이 가능하도록 출력을 발생시키는 연상자동이득제어부(66)와 상기 영상자동이득제어부(66)의 출력에 의해 신호를 증폭하는 영상증폭부(55)로 구성됨을 특징으로 하는 영상신호 중간주파 처리 시스템.The received video signal is amplified by the IF amplifier section 3 'via the tuner section 1' and SAW filter section 2 ', and the phase is adjusted by the NSC section and the automatic phase control section 8', and the local filter section. Oscillation in the voltage adjusting oscillator 10 'through 9' and detecting the phase difference between the oscillation frequency and the input image signal frequency modulated by the automatic phase adjusting unit 8 '. The output of the oscillator 10 'is inputted to the top of the multiplier of the image detector 4' to take out the composite video signal from the intermediate video signal and output the amplified signal to the IF automatic gain controller 12 '. In the conventional intermediate frequency processing system where a stable image signal is output by adjusting the gain of the IF amplifier section 3 'by generating feedback and generating an automatic gain control voltage, and removing noise components from the B / W NC section 14'. Of the composite video signal from which the output noise of the B / W NC unit 14 'is removed. Characterized in that it comprises an associative automatic gain control unit (66) for generating an output so that gain can be adjusted as one input and an image amplification unit (55) for amplifying a signal by the output of the image automatic gain control unit (66). Image signal intermediate frequency processing system. 제1항에 있어서, 영상 자동이득제어부(55)는 트랜지스터(Q1, Q2, Q3, Q4)로 이루어진 비교기와 트랜지스터(Q7, Q8)와 저항(R1, R2, R8, R9)으로 이루어진 DC앰프부로 구성됨을 특징으로 하는 영상신호 중간주파 처리 시스템.The image automatic gain control unit 55 is a comparator consisting of transistors Q 1 , Q 2 , Q 3 , Q 4 , transistors Q 7 , Q 8 , and resistors R 1 , R 2 , R. 8 , R 9 ) video signal intermediate frequency processing system, characterized in that consisting of a DC amplifier. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910003294A 1991-02-28 1991-02-28 Image signal inter-frequency processing system KR940006172B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910003294A KR940006172B1 (en) 1991-02-28 1991-02-28 Image signal inter-frequency processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019910003294A KR940006172B1 (en) 1991-02-28 1991-02-28 Image signal inter-frequency processing system

Publications (2)

Publication Number Publication Date
KR920017446A true KR920017446A (en) 1992-09-26
KR940006172B1 KR940006172B1 (en) 1994-07-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019910003294A KR940006172B1 (en) 1991-02-28 1991-02-28 Image signal inter-frequency processing system

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KR (1) KR940006172B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382653B1 (en) * 2001-03-28 2003-05-09 삼성전자주식회사 Automatic gain control system for operating based on desired signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100382653B1 (en) * 2001-03-28 2003-05-09 삼성전자주식회사 Automatic gain control system for operating based on desired signal

Also Published As

Publication number Publication date
KR940006172B1 (en) 1994-07-08

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