JPS645389A - Information reproducing apparatus - Google Patents

Information reproducing apparatus

Info

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
Application number
JP62158215A
Other languages
Japanese (ja)
Inventor
Makoto Goto
Eiji Ueda
Takeshi Shimohatake
Hiroshi Okamoto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62158215A priority Critical patent/JPS645389A/en
Publication of JPS645389A publication Critical patent/JPS645389A/en
Pending legal-status Critical Current

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.
JP62158215A 1987-06-25 1987-06-25 Information reproducing apparatus Pending JPS645389A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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