JPS648513A - Optical disk signal reproducing system - Google Patents
Optical disk signal reproducing systemInfo
- Publication number
- JPS648513A JPS648513A JP16231387A JP16231387A JPS648513A JP S648513 A JPS648513 A JP S648513A JP 16231387 A JP16231387 A JP 16231387A JP 16231387 A JP16231387 A JP 16231387A JP S648513 A JPS648513 A JP S648513A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- reproducing
- edge position
- waveform
- threshold value
- 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.)
- Granted
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To attain accurate edge position detection by improving the asymmetry of a reproduced waveform and applying digital processing by a threshold value generated while using a reproducing signal level of a pit part as a reference value. CONSTITUTION:A detection signal 101 detected by a photodetector 1 becomes a reproduction signal 102 amplified up to a desired level by an amplifier 2, the reproducing signal 102 is subjected to polarity inversion by an inverse amplifier 3, becomes an inverse signal 108, which is given to a waveform equalizer 4. An equalizing signal 103 waveform-shaped by the waveform equalizer 4 is given to a peak detection circuit 5, the reproducing signal level at the pit part is detected and the detected peak 104 is stored in a hold circuit 6 to form a reference value 105. Then a setting circuit 107 generates a threshold value 106 based on a reference value 105, the equalizing signal 103 is binarized at the threshold value 106 at the comparator circuit 8 to obtain a reproducing pulse 107. Thus, the corresponding between the edge position at the pit and the edge position of the reproducing pulse is improved to reduce the signal detection error.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62162313A JP2617474B2 (en) | 1987-07-01 | 1987-07-01 | Optical disk reorganization device |
US07/213,135 US4961182A (en) | 1987-07-01 | 1988-06-29 | Information retrieving system with level clamping |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62162313A JP2617474B2 (en) | 1987-07-01 | 1987-07-01 | Optical disk reorganization device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS648513A true JPS648513A (en) | 1989-01-12 |
JP2617474B2 JP2617474B2 (en) | 1997-06-04 |
Family
ID=15752147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62162313A Expired - Fee Related JP2617474B2 (en) | 1987-07-01 | 1987-07-01 | Optical disk reorganization device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2617474B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5409058A (en) * | 1993-01-14 | 1995-04-25 | Nippondenso Co., Ltd. | Heat exchanging apparatus |
US5631891A (en) * | 1994-01-05 | 1997-05-20 | Fujitsu Limited | Disk reproducing circuit with automatic gain control |
KR100585055B1 (en) * | 1998-05-12 | 2006-09-12 | 삼성전자주식회사 | Defect Detection Device and Method of Optical System |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5965936A (en) * | 1982-10-05 | 1984-04-14 | Matsushita Electric Ind Co Ltd | Waveform equalizing circuit of optical recording and reproducing signal |
JPS6145415A (en) * | 1984-08-10 | 1986-03-05 | Nec Corp | Reading circuit of optical storage device |
JPS62112230A (en) * | 1985-11-11 | 1987-05-23 | Hitachi Ltd | Threshold level automatic control circuit |
-
1987
- 1987-07-01 JP JP62162313A patent/JP2617474B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5965936A (en) * | 1982-10-05 | 1984-04-14 | Matsushita Electric Ind Co Ltd | Waveform equalizing circuit of optical recording and reproducing signal |
JPS6145415A (en) * | 1984-08-10 | 1986-03-05 | Nec Corp | Reading circuit of optical storage device |
JPS62112230A (en) * | 1985-11-11 | 1987-05-23 | Hitachi Ltd | Threshold level automatic control circuit |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5409058A (en) * | 1993-01-14 | 1995-04-25 | Nippondenso Co., Ltd. | Heat exchanging apparatus |
US5631891A (en) * | 1994-01-05 | 1997-05-20 | Fujitsu Limited | Disk reproducing circuit with automatic gain control |
KR100585055B1 (en) * | 1998-05-12 | 2006-09-12 | 삼성전자주식회사 | Defect Detection Device and Method of Optical System |
Also Published As
Publication number | Publication date |
---|---|
JP2617474B2 (en) | 1997-06-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
MY113337A (en) | Disc apparatus for reproducing information signals recorded on disc-shaped recording medium and reproducing method | |
JPS5764371A (en) | Rotation control system of disk recording medium | |
EP0051343B1 (en) | Signal processing for digital optical disc players | |
AU4554489A (en) | Method and apparatus for controlling and detecting recording laser beam | |
MY130581A (en) | Write once optical disc recording apparatus | |
CA2029719A1 (en) | Optical disc reproducing apparatus | |
ATE26035T1 (en) | DEVICE FOR PLAYING DISCS. | |
MY123099A (en) | Automatic disk discriminating method and apparatus in optical disk system | |
US4706236A (en) | Slice level corrector | |
JPS648513A (en) | Optical disk signal reproducing system | |
JPS5744233A (en) | Recorder and reproducer of digital signal | |
EP1047065A3 (en) | Device and method for reducing crosstalk and intersymbol interference | |
US5999510A (en) | Apparatus and method for recording/reproducing information | |
JPS5788532A (en) | Recording error detection method in optical type recorder | |
JPS57164443A (en) | Optical recording medium and information reproducing device | |
JPH0570965B2 (en) | ||
JPH0722768Y2 (en) | Dropout detection circuit | |
JP2817899B2 (en) | Information playback device | |
SU1520586A1 (en) | Device for reproducing information from magnetic carrier | |
JPH0585978B2 (en) | ||
JPS6116070A (en) | Detector for optical information | |
KR900006583B1 (en) | Recording data reproducing circuit and compensating method of error for pit position recording method | |
JPS59188842A (en) | Signal processing circuit for optical disk device | |
JPH05334802A (en) | Digital signal reproducing device | |
JPS6413231A (en) | Method for regenerating optical information signal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |