JPS645389A - Information reproducing apparatus - Google Patents
Information reproducing apparatusInfo
- Publication number
- JPS645389A JPS645389A JP62158215A JP15821587A JPS645389A JP S645389 A JPS645389 A JP S645389A JP 62158215 A JP62158215 A JP 62158215A JP 15821587 A JP15821587 A JP 15821587A JP S645389 A JPS645389 A JP S645389A
- Authority
- JP
- Japan
- Prior art keywords
- digital
- value
- rotation
- signal
- command value
- 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
Landscapes
- Control Of Electric Motors In General (AREA)
Abstract
PURPOSE:To enable the speed of a capstan motor to be controlled in a wide range with a forward or reverse rotational speed, by applying a feedback loop so that the digital value of a rotation detecting means may coincide with a digital command value, and by changing the digital command value slowly. CONSTITUTION:From a rotation detector 23, the output of digital signal b and timing signal q according to the rotation of a motor section 21 based on signal from a rotation sensor 22 is generated. By the arithmetic unit 25 of a compensator 24, when the timing signal q is changed, then the digital signal b is subtracted from a digital command value for a reference, and a digital rotation error is obtained, and the digital rotation error is added to a cumulative digital value before one rotation. Then, a digital value Y according to the cumulative digital value is applied to a driving unit 28 via a D/A converter 27. Besides, when the digital command value is changed, then the value is increased or reduced at every almost constant time and by every almost specified value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62158215A JPS645389A (en) | 1987-06-25 | 1987-06-25 | Information reproducing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62158215A JPS645389A (en) | 1987-06-25 | 1987-06-25 | Information reproducing apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS645389A true JPS645389A (en) | 1989-01-10 |
Family
ID=15666796
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62158215A Pending JPS645389A (en) | 1987-06-25 | 1987-06-25 | Information reproducing apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS645389A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0340778A (en) * | 1989-07-07 | 1991-02-21 | Matsushita Electric Ind Co Ltd | Speed controller |
US5146427A (en) * | 1989-08-30 | 1992-09-08 | Hitachi Ltd. | High speed semiconductor memory having a direct-bypass signal path |
-
1987
- 1987-06-25 JP JP62158215A patent/JPS645389A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0340778A (en) * | 1989-07-07 | 1991-02-21 | Matsushita Electric Ind Co Ltd | Speed controller |
US5146427A (en) * | 1989-08-30 | 1992-09-08 | Hitachi Ltd. | High speed semiconductor memory having a direct-bypass signal path |
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