JPS6423452A - Magnetic recording and reproducing device - Google Patents

Magnetic recording and reproducing device

Info

Publication number
JPS6423452A
JPS6423452A JP62179030A JP17903087A JPS6423452A JP S6423452 A JPS6423452 A JP S6423452A JP 62179030 A JP62179030 A JP 62179030A JP 17903087 A JP17903087 A JP 17903087A JP S6423452 A JPS6423452 A JP S6423452A
Authority
JP
Japan
Prior art keywords
output
omega0
comparator
rom
counter
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
JP62179030A
Other languages
Japanese (ja)
Inventor
Hikari Masui
Yasuhide Mogi
Yoshizumi Wataya
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 JP62179030A priority Critical patent/JPS6423452A/en
Publication of JPS6423452A publication Critical patent/JPS6423452A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To shorten the time required in leading the cylinder rotating speed to a target speed by changing over the control characteristic of a phase control system according to the rotation frequency of the cylinder at that time. CONSTITUTION:The output of the counter 7 of a speed control system and the aiming rotation frequency omega0 stored in ROM 16 are compared in a comparator 18. The output of the comparator 18 expressed whether the cylinder rotation frequency is higher or lower than the frequency omega0. In a comparator 15, also, the term when a detection characteristic is changed is detected by comparing the output of the phase control system counter 4 and that from the ROM 16 and outputted to a switch 17. Arithmetic circuits 13, 14 output the result substracting or adding the output of the counter 4 and that of the ROM 16 respectively. Two phase system detection characteristics are obtd. by the comparators 15, 18 and circuits 13, 14. Thus the phase error signal outputted from a latch circuit 5 becomes of a high level signal in case of the rotations being lower than omega0 and low level in case of higher than omega0.
JP62179030A 1987-07-20 1987-07-20 Magnetic recording and reproducing device Pending JPS6423452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62179030A JPS6423452A (en) 1987-07-20 1987-07-20 Magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62179030A JPS6423452A (en) 1987-07-20 1987-07-20 Magnetic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6423452A true JPS6423452A (en) 1989-01-26

Family

ID=16058882

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62179030A Pending JPS6423452A (en) 1987-07-20 1987-07-20 Magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6423452A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03202426A (en) * 1989-12-29 1991-09-04 Kobe Steel Ltd Method for continuously annealing non-oriented magnetic steel sheet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03202426A (en) * 1989-12-29 1991-09-04 Kobe Steel Ltd Method for continuously annealing non-oriented magnetic steel sheet

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