KR920005617A - Video detection circuit - Google Patents

Video detection circuit Download PDF

Info

Publication number
KR920005617A
KR920005617A KR1019900013674A KR900013674A KR920005617A KR 920005617 A KR920005617 A KR 920005617A KR 1019900013674 A KR1019900013674 A KR 1019900013674A KR 900013674 A KR900013674 A KR 900013674A KR 920005617 A KR920005617 A KR 920005617A
Authority
KR
South Korea
Prior art keywords
signal
unit
video
control signal
comparison
Prior art date
Application number
KR1019900013674A
Other languages
Korean (ko)
Other versions
KR920007082B1 (en
Inventor
이흥배
Original Assignee
강진구
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 강진구, 삼성전자 주식회사 filed Critical 강진구
Priority to KR1019900013674A priority Critical patent/KR920007082B1/en
Publication of KR920005617A publication Critical patent/KR920005617A/en
Application granted granted Critical
Publication of KR920007082B1 publication Critical patent/KR920007082B1/en

Links

Classifications

    • 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
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Synchronizing For Television (AREA)

Abstract

내용 없음No content

Description

영상 검파 회로Video detection circuit

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

제1도는 본 발명의 구성 블럭도.1 is a block diagram of the present invention.

Claims (1)

IF신호를 내부 VCO 주파수와 비교하여 위상차에 비례하는 제1제어신호(APC)를 발생하는 동시에 영상신호를 원신호로 검파하여, 소정의 제2제어신호에 의해 상기 VCO주파수를 발생하는 PLL영상검파부(10)를 구비한 영상 검파회로에 있어서, 상기 PLL영상검파부(10)의 영상검파신호를 전류하여 영상신호의 평균 DC레벨을 검출하는 DC검출부(20)와, 상기DC영상검파부(10)의 출력과 소정 기준전압을 비교하여 로킹 유무의 제1및 제2비교신호를 발생하는 비교부(30)와, 상기 비교부(30)의 출력을 논리곱하여 로킹 상태의 제1비교신호 발생시 수평동기 신호 주기로 샘플링 신호를 발생하는 게이트(40)와, 상기 게이트(40)의 샘플링 신호 주기로 상기 제1제어신호(APC)의 피크치를 홀드하여 상기PLL영상검파부(10)의 제2제어신호로 궤환시키는 샘플 앤드 홀드부(50)로 구성됨을 특징으로 하는 영상 검파회로.Compares the IF signal with the internal VCO frequency to generate a first control signal (APC) proportional to the phase difference, detects the video signal as an original signal, and detects the PLL image generating the VCO frequency by a predetermined second control signal. In the image detection circuit having a unit 10, the DC detection unit 20 for detecting the average DC level of the video signal by the current of the video detection signal of the PLL image detection unit 10, and the DC image detection unit ( When the first comparison signal in the locked state is generated by comparing the output of step 10) with the comparison unit 30 to generate the first and second comparison signals with and without locking, and the output of the comparison unit 30 by AND. A second control signal of the PLL image detector 10 by holding a peak value of the first control signal APC at a gate 40 for generating a sampling signal at a horizontal synchronization signal period and at a sampling signal period of the gate 40; It consists of a sample and hold unit 50 for feeding back Video detection circuit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019900013674A 1990-08-31 1990-08-31 Image detection circuit KR920007082B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019900013674A KR920007082B1 (en) 1990-08-31 1990-08-31 Image detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019900013674A KR920007082B1 (en) 1990-08-31 1990-08-31 Image detection circuit

Publications (2)

Publication Number Publication Date
KR920005617A true KR920005617A (en) 1992-03-28
KR920007082B1 KR920007082B1 (en) 1992-08-24

Family

ID=19303029

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900013674A KR920007082B1 (en) 1990-08-31 1990-08-31 Image detection circuit

Country Status (1)

Country Link
KR (1) KR920007082B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008011128A (en) * 2006-06-29 2008-01-17 Sanyo Electric Co Ltd Video detection circuit

Also Published As

Publication number Publication date
KR920007082B1 (en) 1992-08-24

Similar Documents

Publication Publication Date Title
KR950035094A (en) Enhanced phase locked loop
KR920003690A (en) Optical receiver circuit
GB2289384A (en) Phase locked loop error suppression circuit and method
KR890012490A (en) VTR signal detection circuit
KR920005617A (en) Video detection circuit
KR920005609A (en) NTSC / PAL signal discrimination circuit and upper limit active filter
DE69613282T2 (en) DEVICE FOR DERIVING A CLOCK SIGNAL FROM A SYNCHRONOUS SIGNAL AND VIDEO RECORDING DEVICE EQUIPPED WITH SUCH A CIRCUIT ARRANGEMENT
KR100255530B1 (en) Pll having a lock state detecting function
KR950016217A (en) Clock signal generator
KR940010711A (en) Video detection circuit
KR930020957A (en) Synchronous separator
KR970004321A (en) Detection phase difference signal output circuit of phase synchronization loop circuit
KR970016591A (en) Synchronous holding range measuring device of phase locked loop (PLL) circuit
KR930014505A (en) VCR time-base error detector
KR930022837A (en) Video Synchronization Signal Detection Circuit Using Horizontal Synchronization Signal
KR930014474A (en) VCR's automatic rental position device
KR930024303A (en) State Machine Phase Locked Loop
KR900001246A (en) Detection circuit
JP3098280B2 (en) Phase synchronization detection circuit
FR2832564B1 (en) PHASE AND FREQUENCY COMPARISON METHOD AND DEVICE
KR20000001394A (en) Method for detecting phase error of digital phase-locked loop and circuit thereof
KR960036335A (en) Phase detector using clamp circuit
KR880006682A (en) Video Synchronization Signal Stabilization Circuit
KR970014307A (en) Specific line position detection device of composite video signal
TH18203EX (en) Circuit for the detection of television signals.

Legal Events

Date Code Title Description
A201 Request for examination
G160 Decision to publish patent application
O035 Opposition [patent]: request for opposition

Free format text: OPPOSITION NUMBER: 001992001727; OPPOSITION DATE: 19921022

SUBM Surrender of laid-open application requested