JPS6423452A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- 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
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.
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)
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 |
-
1987
- 1987-07-20 JP JP62179030A patent/JPS6423452A/en active Pending
Cited By (1)
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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