JPS57120266A - Reproducing device for information recording medium - Google Patents
Reproducing device for information recording mediumInfo
- Publication number
- JPS57120266A JPS57120266A JP56004419A JP441981A JPS57120266A JP S57120266 A JPS57120266 A JP S57120266A JP 56004419 A JP56004419 A JP 56004419A JP 441981 A JP441981 A JP 441981A JP S57120266 A JPS57120266 A JP S57120266A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- microcomputer
- supplied
- circuit
- 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
- Rotational Drive Of Disk (AREA)
Abstract
PURPOSE: To reduce cost by simplifying a circuit constitution, by enabling the output signal which generates a reference signal for a motorservo circuit to be used as an operation clock signal for a microcomputer.
CONSTITUTION: An output oscillation frequency signal from a quartz oscillator 13 is supplied to a 1/256 frequency divider 14 to have a frequency equal to the horizontal scanning frequency of a color video signal. This signal is further frequency-divided by a programmable frequency divider 15 to be supplied as a reference signal to a phase comparator 17, where it is phase-compared with a rotation detection signal from a rotation detector 10 and applied to a motor 9, whose rotational frequency is controlled. Thus, the output oscillation frequency signal of the quartz oscillator 13 is used as a reference signal for a constant- speed servo circuit for the motor 9, but supplied as a clock signal to a key-input fetching microcomputer 11 and a microcomputer 12 for equipment operation control, thereby operating them.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56004419A JPS57120266A (en) | 1981-01-14 | 1981-01-14 | Reproducing device for information recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56004419A JPS57120266A (en) | 1981-01-14 | 1981-01-14 | Reproducing device for information recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57120266A true JPS57120266A (en) | 1982-07-27 |
Family
ID=11583755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56004419A Pending JPS57120266A (en) | 1981-01-14 | 1981-01-14 | Reproducing device for information recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57120266A (en) |
-
1981
- 1981-01-14 JP JP56004419A patent/JPS57120266A/en active Pending
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