KR970017224A - Tracking control method and device for low speed playback of video tape recorder - Google Patents

Tracking control method and device for low speed playback of video tape recorder Download PDF

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Publication number
KR970017224A
KR970017224A KR1019950032195A KR19950032195A KR970017224A KR 970017224 A KR970017224 A KR 970017224A KR 1019950032195 A KR1019950032195 A KR 1019950032195A KR 19950032195 A KR19950032195 A KR 19950032195A KR 970017224 A KR970017224 A KR 970017224A
Authority
KR
South Korea
Prior art keywords
head
capstan
signal
selection signal
playhead
Prior art date
Application number
KR1019950032195A
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Korean (ko)
Other versions
KR0176533B1 (en
Inventor
김기환
Original Assignee
김광호
삼성전자 주식회사
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Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019950032195A priority Critical patent/KR0176533B1/en
Publication of KR970017224A publication Critical patent/KR970017224A/en
Application granted granted Critical
Publication of KR0176533B1 publication Critical patent/KR0176533B1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
    • G11B5/588—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes by controlling the position of the rotating heads
    • 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
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/125—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams conditioned by the operating function of the apparatus

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

본 발명은 비디오 테이프 레코더의 저속재생시 트래킹제어방법 및 장치를 개시한다. 본 발명의 방법은 헤드 선택신호에 따라 SP 헤드와 EP 헤드를 각각 선택하는 제1단계; 제2단계에서 선택된 SP 헤드 및 EP 헤드로부터 재생되는 신호를 비교하여 디지탈신호를 생성하는 제2단계; 헤드선택신호에 따라서 캡스턴제어신호의 캡스턴모터 캡스턴모터 구동시작점(Ta)을 인식하는 제3단계; 제3단계에서 생성되는 디지탈신호와 캡스턴서보로부터 출력되는 재생헤드 선택신호가 동일한지 여부를 판단하는 제4단계; 제3단계에서 생성되는 디지탈신호와 재생헤드 선택신호가 같으면 트랭킹 프로그램을 종료하고, 다르면 캡스턴제어신호의 캡스턴모터 구동종료점(TB)을 제어하는 제5단계를 포함한다.The present invention discloses a tracking control method and apparatus for low speed playback of a video tape recorder. The method of the present invention comprises the steps of selecting the SP head and the EP head according to the head selection signal, respectively; A second step of generating a digital signal by comparing signals reproduced from the SP head and the EP head selected in the second step; A third step of recognizing the capstan motor capstan motor driving starting point (T a) of the capstan control signal according to a head select signal; A fourth step of determining whether the digital signal generated in the third step and the playhead selection signal output from the capstan servo are the same; And a fifth step of terminating the tracking program if the digital signal generated in the third step and the playhead selection signal are the same, and controlling the capstan motor driving end point T B of the capstan control signal if different.

따라서, 본 발명은 재생헤드 선택신호와 엔벨로프 비교기로부터 출력되는 신호가 일치하도록 캡스턴제어신호를 조정하여 트래킹을 수행하므로써 별도의 외부입력키 조작이 필요없다.Therefore, the present invention eliminates the need for a separate external input key operation by adjusting the capstan control signal so that the playhead selection signal and the signal output from the envelope comparator match.

Description

비디오 테이프 레코더의 저속재생시 트래킹제어방법 및 장치Tracking control method and device for low speed playback of video tape recorder

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

제1A도는 본 발명에 의한 비디오 테이프 레코더의 저속재생시 트랭킹제어장치의 블럭도,1A is a block diagram of a tracking control apparatus at low speed playback of a video tape recorder according to the present invention;

제1B도는 제1A도의 상세블럭도,1B is a detailed block diagram of FIG. 1A,

제2도는 본 발명에 사용되는 비디오 테이프 레코더의 제4헤드드럼을 도시한 평면도,2 is a plan view showing a fourth head drum of a video tape recorder used in the present invention;

제3A도 내지 제3E도는 제1B도에 도시된 구성요소 각부의 파형을 도시한 타이밍도.3A to 3E are timing charts showing waveforms of respective components shown in FIG. 1B.

Claims (3)

재생헤드가 비디오테이프를 정확하게 트레이스하도록 캡스턴모터를 제어하는 비디오 테이프 레코더의 저속재생시 트랭킹방법에 있어서, 캡스턴서보로부터 출력되는 헤드선택신호에 따라서 SP 헤드와 EP 헤드를 각각 선택하는 제1단계; 상기 제2단계에서 선택된 SP 헤드로부터 재생되는 신호와 상기 제2단계에서 선택된 EP헤드로부터 재생되는 신호를 비교하여 디지탈신호를 생성하는 제2단계; 캡스턴서보로부터 출력되는 헤드선택신호의 에지로부터 캡스턴제어신호의 캡스턴모터 구동시작점(Ta)을 인식하는 제3단계; 상기 제3단계에서 생성되는 디지탈신호와 캡스턴서보로부터 출력되는 재생헤드 선택신호가 동일한지 여부를 판단하는 제4단계; 상기 제3단계에서 생성되는 디지탈신호와 재생헤드 선택신호가 같으면 트래킹 프로그램을 종료하고, 상기 제3단계에서 생성되는 디지탈신호와 재생헤드 선택신호가 다르면 캡스턴제어신호의 캡스턴모터 구동종료점(TB)을 제어하는 제5단계를 포함하는 비디오 테이프 레코더의 저속재생시 트래킹방법.CLAIMS What is claimed is: 1. A tracking method for low speed playback of a video tape recorder that controls a capstan motor so that the playhead accurately traces the videotape, the method comprising: a first step of selecting an SP head and an EP head according to a head selection signal output from a capstan servo; A second step of generating a digital signal by comparing a signal reproduced from the SP head selected in the second step with a signal reproduced from the EP head selected in the second step; Capstan motor driving starting point of the capstan control signal from the head edge of the selection signal output from the capstan servo third step of recognizing (T a); A fourth step of determining whether the digital signal generated in the third step and the playhead selection signal output from the capstan servo are the same; If the digital signal generated in the third step and the playhead selection signal are the same, the tracking program ends. If the digital signal and the playhead selection signal generated in the third step are different, the capstan motor driving end point T B of the capstan control signal is different. And a fifth step of controlling the video tape recorder. 헤드선택신호에 따라서 재생헤드로부터 SP헤드와 EP헤드를 각각 선택하는 SP/EP헤드 선택수단; 상기 SP/EP헤드 선택수단에서 선택되는 SP헤드의 엔벨로프와 EP헤드의 엔벨로프를 비교하여 디지탈신호로 출력하는 엔벨로프 비교수단; 상기 엔벨로프 비교수단으로부터 출력되는 디지탈신호와 캡스턴서보로부터 출력되는 재생헤드 선택신호를 입력하여, 이 신호들이 서로 동일한 신호인지를 판단하고, 판단한 결과에 따라서 캡스턴 제어신호를 생성하는 마이콤; 및 상기 헤드선택신호와 상기 재생헤드 선택신호를 출력하며, 상기 캡스턴제어신호를 입력하여 캡스턴모터를 구동시키는 캡스턴서보를 포함하는 비디오 테이프 레코더의 저속재생시 트래킹장치.SP / EP head selecting means for selecting the SP head and the EP head from the playback head according to the head selection signal; Envelope comparing means for comparing the envelope of the SP head selected from the SP / EP head selecting means with the envelope of the EP head and outputting the digital signal; A microcomputer inputting a digital signal outputted from the envelope comparing means and a playhead selection signal outputted from a capstan servo, determining whether these signals are the same signal, and generating a capstan control signal according to the determined result; And a capstan servo for outputting the head selection signal and the reproduction head selection signal, and inputting the capstan control signal to drive a capstan motor. 제2항에 있어서, 상기 엔벨로프 비교수단의 출력을 저역필터링하는 저역통과필터와, 상기 저역통과필터에서 출력된 신호의 상승시간 및 하강시간을 줄이는 비교기를 더 포함하는 비디오 테이프 레코더의 저속재생시 트래킹장치.The tracking method of claim 2, further comprising: a low pass filter for low-pass filtering the output of the envelope comparing means, and a comparator for reducing the rise time and the fall time of the signal output from the low pass filter. Device. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950032195A 1995-09-27 1995-09-27 Tracking control apparatus and method KR0176533B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950032195A KR0176533B1 (en) 1995-09-27 1995-09-27 Tracking control apparatus and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950032195A KR0176533B1 (en) 1995-09-27 1995-09-27 Tracking control apparatus and method

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KR970017224A true KR970017224A (en) 1997-04-30
KR0176533B1 KR0176533B1 (en) 1999-04-15

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