JPS55125515A - Memory control method - Google Patents

Memory control method

Info

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
Application number
JP3350579A
Other languages
Japanese (ja)
Inventor
Keiji Hasegawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP3350579A priority Critical patent/JPS55125515A/en
Priority to US06/130,899 priority patent/US4357635A/en
Publication of JPS55125515A publication Critical patent/JPS55125515A/en
Pending legal-status Critical Current

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
JP3350579A 1979-03-20 1979-03-20 Memory control method Pending JPS55125515A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5169614A (en) * 1974-12-13 1976-06-16 Fujitsu Ltd KIOKUSEIGYOHOSHIKI

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5169614A (en) * 1974-12-13 1976-06-16 Fujitsu Ltd KIOKUSEIGYOHOSHIKI

Cited By (4)

* Cited by examiner, † Cited by third party
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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