JPS57173282A - Auto tracking device for variable speed reproduction - Google Patents

Auto tracking device for variable speed reproduction

Info

Publication number
JPS57173282A
JPS57173282A JP56057203A JP5720381A JPS57173282A JP S57173282 A JPS57173282 A JP S57173282A JP 56057203 A JP56057203 A JP 56057203A JP 5720381 A JP5720381 A JP 5720381A JP S57173282 A JPS57173282 A JP S57173282A
Authority
JP
Japan
Prior art keywords
shift
dropout
tracking
unit
comparator
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP56057203A
Other languages
Japanese (ja)
Inventor
Nobuo Azuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56057203A priority Critical patent/JPS57173282A/en
Publication of JPS57173282A publication Critical patent/JPS57173282A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven

Abstract

PURPOSE:To eliminate noise by constantly varying the amount of the tracking shift of a servo circuit in both forward and backward direction by a unit extent, detecting and judging the increasing or decreasing direction of a dropout, and shifting a noise band into a vertical blanking period. CONSTITUTION:The amount of delay of a control signal (d) reproduced by a control head 23 is varied increasingly and decreasingly by a unit extent to shift the tracking of a capstan servo circuit 25 in both forward and backward directions by a unit. Dropout levels which correspond to noise band in a vertical blanking period before and after the shift of tracking are compared mutually by a comparator 22. The output of the comparator 22 is supplied to a microcomputer 26 to detect and judges the increasing or decreasing direction of the dropout levels before and after the shift. As a result, auto tracking operation is carried out so as to maximize the dropout level.
JP56057203A 1981-04-17 1981-04-17 Auto tracking device for variable speed reproduction Pending JPS57173282A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56057203A JPS57173282A (en) 1981-04-17 1981-04-17 Auto tracking device for variable speed reproduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56057203A JPS57173282A (en) 1981-04-17 1981-04-17 Auto tracking device for variable speed reproduction

Publications (1)

Publication Number Publication Date
JPS57173282A true JPS57173282A (en) 1982-10-25

Family

ID=13048935

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56057203A Pending JPS57173282A (en) 1981-04-17 1981-04-17 Auto tracking device for variable speed reproduction

Country Status (1)

Country Link
JP (1) JPS57173282A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60103546A (en) * 1983-11-11 1985-06-07 Hitachi Ltd Variable speed reproduction tracking device of magnetic recording and reproducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567577A (en) * 1979-06-29 1981-01-26 Mitsubishi Electric Corp Magnetic recording and reproducing unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567577A (en) * 1979-06-29 1981-01-26 Mitsubishi Electric Corp Magnetic recording and reproducing unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60103546A (en) * 1983-11-11 1985-06-07 Hitachi Ltd Variable speed reproduction tracking device of magnetic recording and reproducing device
JPH0572794B2 (en) * 1983-11-11 1993-10-13 Hitachi Ltd

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