JPS55125515A - Memory control method - Google Patents
Memory control methodInfo
- Publication number
- JPS55125515A JPS55125515A JP3350579A JP3350579A JPS55125515A JP S55125515 A JPS55125515 A JP S55125515A JP 3350579 A JP3350579 A JP 3350579A JP 3350579 A JP3350579 A JP 3350579A JP S55125515 A JPS55125515 A JP S55125515A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- reproduction
- output
- phase difference
- vco
- 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
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
PURPOSE: To attain to make a recording medium store large capacity, by making it possible to record or regenerate with the same recording density through all the tracks of a disk, by varying the recording bit period linearly by use of PLL.
CONSTITUTION: When the instruction of recording or reproduction has been transmitted to the input/output control unit IOP from CPU, a data corresponding to the track address is provided to the preset counter PC from IOP. And a phase detector PD detects the phase difference between the output pulse V of PC and the standard clock ϕx, outputs the pulse A in proportion to the phase difference, and controls VCO through LP F-F. The output ϕF of VCO is used as a basic clock of recording and reproduction.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3350579A JPS55125515A (en) | 1979-03-20 | 1979-03-20 | Memory control method |
US06/130,899 US4357635A (en) | 1979-03-20 | 1980-03-17 | Disc memory apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3350579A JPS55125515A (en) | 1979-03-20 | 1979-03-20 | Memory control method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55125515A true JPS55125515A (en) | 1980-09-27 |
Family
ID=12388398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3350579A Pending JPS55125515A (en) | 1979-03-20 | 1979-03-20 | Memory control method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55125515A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2508217A1 (en) * | 1981-06-18 | 1982-12-24 | Tokyo Shibaura Electric Co | DEVICE AND METHOD FOR RECORDING INFORMATION ON A DISK |
JPS60256986A (en) * | 1984-05-31 | 1985-12-18 | Mitsubishi Electric Corp | Reproducing device |
JPH01133269A (en) * | 1987-10-06 | 1989-05-25 | Smc Standard Microsyst Corp | Analog floppy disc data separator |
JPH02113850U (en) * | 1989-02-28 | 1990-09-12 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5169614A (en) * | 1974-12-13 | 1976-06-16 | Fujitsu Ltd | KIOKUSEIGYOHOSHIKI |
-
1979
- 1979-03-20 JP JP3350579A patent/JPS55125515A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5169614A (en) * | 1974-12-13 | 1976-06-16 | Fujitsu Ltd | KIOKUSEIGYOHOSHIKI |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2508217A1 (en) * | 1981-06-18 | 1982-12-24 | Tokyo Shibaura Electric Co | DEVICE AND METHOD FOR RECORDING INFORMATION ON A DISK |
JPS60256986A (en) * | 1984-05-31 | 1985-12-18 | Mitsubishi Electric Corp | Reproducing device |
JPH01133269A (en) * | 1987-10-06 | 1989-05-25 | Smc Standard Microsyst Corp | Analog floppy disc data separator |
JPH02113850U (en) * | 1989-02-28 | 1990-09-12 |
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