JPS57143765A - Disc reproducing device - Google Patents
Disc reproducing deviceInfo
- 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
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.
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)
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)
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 |
-
1981
- 1981-03-02 JP JP2959381A patent/JPS57143765A/en active Pending
Patent Citations (2)
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)
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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5736476A (en) | Pcm signal recorder and reproducer | |
JPS57143765A (en) | Disc reproducing device | |
JPS5761957A (en) | Storing method of signal waveform pattern | |
JPS57143705A (en) | Faulty sector processing method of magnetic disk medium | |
SU1014062A1 (en) | Device for testing operability of relay protection unit | |
SU1070489A1 (en) | Signalling device | |
JPS55113112A (en) | Read error detection system of magnetic disk memory unit | |
SU652558A1 (en) | Number sorting arrangement | |
RU2042270C1 (en) | Device for search of noise-like signal | |
JPS56129482A (en) | Compression system for gradation data | |
SU1220014A1 (en) | Device for checking control circuit of nuclear reactor | |
JPS57164643A (en) | Start bit detecting circuit | |
JPS56161790A (en) | Monitoring system for storage circuit | |
JPS6427035A (en) | Optical information recording and reproducing device | |
JPS56121120A (en) | Setting method for initial state of information processor | |
JPS5733849A (en) | Cyclic information transmission device | |
JPS576499A (en) | Storage device | |
JPS5343428A (en) | Information discriminating/controlling system | |
JPS56107316A (en) | Discrimination system of error factor | |
JPS5731224A (en) | Magnetic recording and reproducing circuit | |
JPS57160239A (en) | Encoding system | |
JPS56145435A (en) | Error analysis system | |
JPS57147177A (en) | Address signal detecting circuit | |
JPS5451347A (en) | Fault detection system of data processor | |
JPS5981928A (en) | Bridge tap equalizing circuit |