JPS57143765A - Disc reproducing device - Google Patents

Disc reproducing device

Info

Publication number
JPS57143765A
JPS57143765A JP2959381A JP2959381A JPS57143765A JP S57143765 A JPS57143765 A JP S57143765A JP 2959381 A JP2959381 A JP 2959381A JP 2959381 A JP2959381 A JP 2959381A JP S57143765 A JPS57143765 A JP S57143765A
Authority
JP
Japan
Prior art keywords
data
present
forecast
value
converter
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
JP2959381A
Other languages
Japanese (ja)
Inventor
Takashi Ito
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP2959381A priority Critical patent/JPS57143765A/en
Publication of JPS57143765A publication Critical patent/JPS57143765A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To increase the reliability of an error signal, by comparing and previous data stored in a memory in which output data of an A/D converter is stored, with present data from the A/D converter discriminate said data. CONSTITUTION:A comparison and discriminating circuit 19 performs a comparison between a present focus data DF1 and tracking data DT1 generated from A/D converters 15 and 16 and passed through delay circuits 20 and 21, and forecast data DF2 and DT2 to discriminate whether the present data are normal or not. If the level difference between the forecast data and the present data is a prescribed value or more and if the polarity is dissident, the present data is discriminated as being abnormal. Thus, the reliability of time difference signal can be increased, by checking the degree of the correlation between the forecast value and the present value.
JP2959381A 1981-03-02 1981-03-02 Disc reproducing device Pending JPS57143765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2959381A JPS57143765A (en) 1981-03-02 1981-03-02 Disc reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2959381A JPS57143765A (en) 1981-03-02 1981-03-02 Disc reproducing device

Publications (1)

Publication Number Publication Date
JPS57143765A true JPS57143765A (en) 1982-09-06

Family

ID=12280365

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2959381A Pending JPS57143765A (en) 1981-03-02 1981-03-02 Disc reproducing device

Country Status (1)

Country Link
JP (1) JPS57143765A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138275A2 (en) * 1983-10-17 1985-04-24 Koninklijke Philips Electronics N.V. Apparatus for reproducing information from an optically readable record carrier
JPS62243135A (en) * 1986-04-16 1987-10-23 Matsushita Electric Ind Co Ltd Information recording and reproducing device
EP0252502A2 (en) * 1986-07-11 1988-01-13 Hitachi, Ltd. Optical information recording and reproducing apparatus with tracking control by sampling
EP0253328A2 (en) * 1986-07-11 1988-01-20 Hitachi, Ltd. Light spot position control system and method by sampling servo
JPS6320726A (en) * 1986-07-15 1988-01-28 Hitachi Ltd Optical disk device
JPS647339A (en) * 1987-06-30 1989-01-11 Matsushita Electric Ind Co Ltd Tracking controller
JPS6476575A (en) * 1987-09-18 1989-03-22 Pioneer Electronic Corp Tracking circuit
JPH01155525A (en) * 1987-12-11 1989-06-19 Hitachi Ltd Optical disk device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5647932A (en) * 1979-09-25 1981-04-30 Victor Co Of Japan Ltd Servo system of discoid recording medium recording and/or reproducing device
JP3108819B2 (en) * 1991-07-08 2000-11-13 富士通株式会社 Semiconductor memory device and method of manufacturing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5647932A (en) * 1979-09-25 1981-04-30 Victor Co Of Japan Ltd Servo system of discoid recording medium recording and/or reproducing device
JP3108819B2 (en) * 1991-07-08 2000-11-13 富士通株式会社 Semiconductor memory device and method of manufacturing the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138275A2 (en) * 1983-10-17 1985-04-24 Koninklijke Philips Electronics N.V. Apparatus for reproducing information from an optically readable record carrier
JPS62243135A (en) * 1986-04-16 1987-10-23 Matsushita Electric Ind Co Ltd Information recording and reproducing device
EP0252502A2 (en) * 1986-07-11 1988-01-13 Hitachi, Ltd. Optical information recording and reproducing apparatus with tracking control by sampling
EP0253328A2 (en) * 1986-07-11 1988-01-20 Hitachi, Ltd. Light spot position control system and method by sampling servo
JPS6318529A (en) * 1986-07-11 1988-01-26 Hitachi Ltd Optical disk tracking system
JPS6320726A (en) * 1986-07-15 1988-01-28 Hitachi Ltd Optical disk device
JPS647339A (en) * 1987-06-30 1989-01-11 Matsushita Electric Ind Co Ltd Tracking controller
JPS6476575A (en) * 1987-09-18 1989-03-22 Pioneer Electronic Corp Tracking circuit
JPH01155525A (en) * 1987-12-11 1989-06-19 Hitachi Ltd Optical disk device

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