MY107309A - Detection circuit. - Google Patents
Detection circuit.Info
- Publication number
- MY107309A MY107309A MYPI90001677A MYPI19901677A MY107309A MY 107309 A MY107309 A MY 107309A MY PI90001677 A MYPI90001677 A MY PI90001677A MY PI19901677 A MYPI19901677 A MY PI19901677A MY 107309 A MY107309 A MY 107309A
- Authority
- MY
- Malaysia
- Prior art keywords
- signal
- track
- change
- detection circuit
- dirt
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0948—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Abstract
A BEAM OF LIGHT SCANNING THE DATA ON AN OPTICAL RECORDING GENERATES AN HF SIGNAL INRECORDING- AND- PLAYBACK EQUIPMENT. SINCE THE HF SIGNAL COLLAPSES WHEN THE LIGHT BEAM LEAVES A DATA TRACK, THE DETECTION CIRCUIT DETERMINES FROM THE LEVEL OF THE HF SIGNAL WHETHER THE BEAM IS SKIPPING FROM ONE TRACK TO THE NEXT.SINCE THE BREAKDOWNS OF THE HF SIGNAL CAN ALSO BE CAUSED BY DIRT ON, DAMAGE TO, OR IMPERFERFECTIONS IN THE RECORDING, IT IS IMPOSSIBLE TO DEFINITELY DETERMINE WHETHER AN HF BREAKDOWN IS CAUSED BY A TRACK CHANGE OR BY DIRT, DAMAGE OR IMPERFECTIONS.TO RELIABLY RECOGNIZE A CHANGE OF TRACK CHANGE WHEN THE HF SIGNAL (HF) IS BELOW A PRESCRIBED THRESHOLD (R1) AND A TRACKING - ERROR SIGNAL (TE) IS SIMULTANEOUSLY ABOVE ANOTHER PRESCRIBED THRESHOLD (R2).(FIG.6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3932831A DE3932831A1 (en) | 1989-09-30 | 1989-09-30 | DETECTION CIRCUIT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MY107309A true MY107309A (en) | 1995-11-30 |
Family
ID=6390658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| MYPI90001677A MY107309A (en) | 1989-09-30 | 1990-09-28 | Detection circuit. |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP0494892B1 (en) |
| JP (1) | JP2854131B2 (en) |
| KR (1) | KR100227668B1 (en) |
| CN (1) | CN1020009C (en) |
| AT (1) | ATE119706T1 (en) |
| AU (1) | AU6418690A (en) |
| DD (1) | DD298325A5 (en) |
| DE (2) | DE3932831A1 (en) |
| ES (1) | ES2071829T3 (en) |
| FI (1) | FI921365A0 (en) |
| HK (1) | HK81796A (en) |
| HU (1) | HUT61118A (en) |
| MY (1) | MY107309A (en) |
| TR (1) | TR24612A (en) |
| WO (1) | WO1991005340A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0538936B1 (en) * | 1991-10-23 | 1997-01-08 | Koninklijke Philips Electronics N.V. | Device for scanning a record carrier |
| JP2002150572A (en) * | 2000-11-07 | 2002-05-24 | Sanyo Electric Co Ltd | Disk device |
| DE10062079A1 (en) * | 2000-12-13 | 2002-06-27 | Thomson Brandt Gmbh | Track counting method and corresponding device for reading and / or writing to an optical recording medium |
| JP4245436B2 (en) * | 2003-08-08 | 2009-03-25 | パナソニック株式会社 | Defect detection device |
| WO2008122917A1 (en) * | 2007-04-05 | 2008-10-16 | Koninklijke Philips Electronics N.V. | Optical disc drive with delayed layer jump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4855977A (en) * | 1987-07-27 | 1989-08-08 | Laser Magnetic Storage International Company | Track seeking apparatus and method using sampled information |
-
1989
- 1989-09-30 DE DE3932831A patent/DE3932831A1/en not_active Withdrawn
-
1990
- 1990-09-20 WO PCT/EP1990/001595 patent/WO1991005340A1/en active IP Right Grant
- 1990-09-20 DE DE59008679T patent/DE59008679D1/en not_active Expired - Lifetime
- 1990-09-20 AU AU64186/90A patent/AU6418690A/en not_active Abandoned
- 1990-09-20 AT AT90914170T patent/ATE119706T1/en not_active IP Right Cessation
- 1990-09-20 ES ES90914170T patent/ES2071829T3/en not_active Expired - Lifetime
- 1990-09-20 KR KR1019920700709A patent/KR100227668B1/en not_active IP Right Cessation
- 1990-09-20 JP JP2513261A patent/JP2854131B2/en not_active Expired - Lifetime
- 1990-09-20 EP EP90914170A patent/EP0494892B1/en not_active Expired - Lifetime
- 1990-09-20 HU HU9200995A patent/HUT61118A/en unknown
- 1990-09-28 MY MYPI90001677A patent/MY107309A/en unknown
- 1990-09-28 DD DD90344296A patent/DD298325A5/en not_active IP Right Cessation
- 1990-09-28 CN CN90108036A patent/CN1020009C/en not_active Expired - Lifetime
- 1990-10-08 TR TR90/0923A patent/TR24612A/en unknown
-
1992
- 1992-03-27 FI FI921365A patent/FI921365A0/en not_active Application Discontinuation
-
1996
- 1996-05-09 HK HK81796A patent/HK81796A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991005340A1 (en) | 1991-04-18 |
| HUT61118A (en) | 1992-11-30 |
| DD298325A5 (en) | 1992-02-13 |
| CN1050637A (en) | 1991-04-10 |
| EP0494892B1 (en) | 1995-03-08 |
| DE3932831A1 (en) | 1991-04-11 |
| TR24612A (en) | 1992-01-01 |
| CN1020009C (en) | 1993-03-03 |
| AU6418690A (en) | 1991-04-28 |
| JPH05500577A (en) | 1993-02-04 |
| HK81796A (en) | 1996-05-17 |
| DE59008679D1 (en) | 1995-04-13 |
| KR100227668B1 (en) | 1999-11-01 |
| ATE119706T1 (en) | 1995-03-15 |
| FI921365A (en) | 1992-03-27 |
| ES2071829T3 (en) | 1995-07-01 |
| HU9200995D0 (en) | 1992-06-29 |
| KR920704281A (en) | 1992-12-19 |
| JP2854131B2 (en) | 1999-02-03 |
| FI921365A0 (en) | 1992-03-27 |
| EP0494892A1 (en) | 1992-07-22 |
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