KR940004612A - How to prevent noise during VTR playback - Google Patents

How to prevent noise during VTR playback Download PDF

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Publication number
KR940004612A
KR940004612A KR1019920014296A KR920014296A KR940004612A KR 940004612 A KR940004612 A KR 940004612A KR 1019920014296 A KR1019920014296 A KR 1019920014296A KR 920014296 A KR920014296 A KR 920014296A KR 940004612 A KR940004612 A KR 940004612A
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KR
South Korea
Prior art keywords
tracking
value
detected
envelope
tracking value
Prior art date
Application number
KR1019920014296A
Other languages
Korean (ko)
Other versions
KR0178261B1 (en
Inventor
김명호
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.)
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Publication date
Application filed by 강진구, 삼성전자 주식회사 filed Critical 강진구
Priority to KR1019920014296A priority Critical patent/KR0178261B1/en
Publication of KR940004612A publication Critical patent/KR940004612A/en
Application granted granted Critical
Publication of KR0178261B1 publication Critical patent/KR0178261B1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

콘트롤 펄스가 기록되는 테이프를 재생시키는 VTR에 있어서, 콘트롤 펄스가 없거나 있더라도 검출되지 않을 경우 화면에 노이즈가 발생되는 문제점을 없애기 위하여 콘트롤 펄스가 검출되면 최적의 트랙킹 값을 찾아 트랙킹을 수행시키고 콘트롤 펄스가 검출되지 않으면 이전에 메모리 시킨 트랙킹 값으로 트랙킹 시켜 엔벨로우프 직류파형의 입력게인이 일정범위 이내로 변동될 경우 이전 트랙킹 값을 유지시키며 이전에 메모리 시킨 트랙킹 값이 없거나 엔벨로우프 직류파형의 입력게인이 일정범위 이상 변동되면 어느 정도 트랙킹을 변화시켜 최적의 트랙킹 방향을 알아낸 후 트랙킹을 미세 이동시켜 가며 최적의 트랙킹이 될 수 있도록 하므로써 콘트롤 펄스가 없거나 검출되지 않더라도 노이즈 없는 화면을 즐길 수 있다.In a VTR that plays back a tape on which control pulses are recorded, in order to eliminate the problem that noise occurs on the screen when no control pulses are detected or detected, when the control pulses are detected, tracking is performed to find the optimal tracking value. If it is not detected, it tracks to the tracking value memorized before and keeps the previous tracking value if the input gain of the envelope DC waveform changes within a certain range, and there is no tracking value previously memorized or the input gain of the envelope DC waveform exceeds the certain range. If it changes, it can change the tracking to some extent to find out the best tracking direction, and then finely move the tracking so that the best tracking can be achieved without noise or without control pulse.

Description

VTR 재생시 노이즈 방지 방법How to prevent noise during VTR playback

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

제1도는 비디오 테이프의 신호 기록 상태도.1 is a signal recording state diagram of a video tape.

제2도는 비디오 헤드의 트랙킹 상태를 나타낸 상태도.2 is a state diagram showing a tracking state of a video head.

제3도는 비디오 헤드의 트랙킹 상태에 따른 엔벨로우프 파형도.3 is an envelope waveform diagram according to a tracking state of a video head.

제4도는 엔벨로우프 신호의 직류 파형 변환도.4 is a DC waveform conversion diagram of an envelope signal.

Claims (1)

재생 모우드시 콘트롤 펄스가 검출되면 엔벨로우프 직류 파형의 평균치가 가장 큰 값을 찾아 트랙킹시키는 한편 그때의 트랙킹 값을 메모리 시키는 과정과, 재생 모우드시 콘트롤 펄스가 검출되지 않으면 메모리된 트랙킹 값으로 트랙킹을 수행하며 엔벨로우프 직류 파형이 일정값 이상 변동되는 가를 체크하는 과정과, 일정값 이상 변동되지 않으면 이전 트랙킹 값을 유지시키고 일정값 이상 변동되면 트랙킹값을 변동시켜 트랙킹값 이동방향을 알아내는 과정과, 트랙킹값 이동방향이 판단되면 트랙킹값을 미세 이동시켜 가며 최적의 트랙킹 값을 찾아 메모리 시키고 트랙킹을 수행시키는 과정으로 이루어지는 것을 특징으로 하는 VTR 재생 노이즈 방지방법.When the control pulse is detected during the playback mode, the average value of the envelope DC waveform is found and tracked, and the tracking value is memorized. If the control pulse is not detected during the playback mode, tracking is performed using the memorized tracking value. The process of checking whether the envelope DC waveform fluctuates more than a certain value, maintains the previous tracking value if it does not fluctuate more than a certain value, and finds the direction of the tracking value by changing the tracking value if it fluctuates more than a certain value. When the value moving direction is determined, the tracking value is finely moved, finding and storing the optimal tracking value, and performing tracking. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920014296A 1992-08-08 1992-08-08 Vtr noise protection method KR0178261B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920014296A KR0178261B1 (en) 1992-08-08 1992-08-08 Vtr noise protection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920014296A KR0178261B1 (en) 1992-08-08 1992-08-08 Vtr noise protection method

Publications (2)

Publication Number Publication Date
KR940004612A true KR940004612A (en) 1994-03-15
KR0178261B1 KR0178261B1 (en) 1999-04-15

Family

ID=19337713

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920014296A KR0178261B1 (en) 1992-08-08 1992-08-08 Vtr noise protection method

Country Status (1)

Country Link
KR (1) KR0178261B1 (en)

Also Published As

Publication number Publication date
KR0178261B1 (en) 1999-04-15

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