JPS57173282A - Auto tracking device for variable speed reproduction - Google Patents
Auto tracking device for variable speed reproductionInfo
- 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
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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS567577A (en) * | 1979-06-29 | 1981-01-26 | Mitsubishi Electric Corp | Magnetic recording and reproducing unit |
-
1981
- 1981-04-17 JP JP56057203A patent/JPS57173282A/en active Pending
Patent Citations (1)
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)
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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