DE68921349D1 - Selbcompensierendes aufzeichnungs- und wiedergabeverfahren für daten hoher dichte. - Google Patents
Selbcompensierendes aufzeichnungs- und wiedergabeverfahren für daten hoher dichte.Info
- Publication number
- DE68921349D1 DE68921349D1 DE68921349T DE68921349T DE68921349D1 DE 68921349 D1 DE68921349 D1 DE 68921349D1 DE 68921349 T DE68921349 T DE 68921349T DE 68921349 T DE68921349 T DE 68921349T DE 68921349 D1 DE68921349 D1 DE 68921349D1
- Authority
- DE
- Germany
- Prior art keywords
- self
- high density
- density data
- playback method
- compensating recording
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
- G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Digital Magnetic Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/270,748 US4987500A (en) | 1988-11-14 | 1988-11-14 | Self compensating high density data recording and detection scheme |
PCT/US1989/005120 WO1990005975A1 (en) | 1988-11-14 | 1989-11-13 | Self-compensating high density data recording and detection scheme |
Publications (2)
Publication Number | Publication Date |
---|---|
DE68921349D1 true DE68921349D1 (de) | 1995-03-30 |
DE68921349T2 DE68921349T2 (de) | 1995-10-05 |
Family
ID=23032634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE68921349T Expired - Fee Related DE68921349T2 (de) | 1988-11-14 | 1989-11-13 | Selbcompensierendes aufzeichnungs- und wiedergabeverfahren für daten hoher dichte. |
Country Status (6)
Country | Link |
---|---|
US (1) | US4987500A (de) |
EP (1) | EP0449853B1 (de) |
JP (1) | JP2741633B2 (de) |
AU (1) | AU4641889A (de) |
DE (1) | DE68921349T2 (de) |
WO (1) | WO1990005975A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5594597A (en) * | 1991-11-01 | 1997-01-14 | Iomega Corporation | Neural network disk drive read channel pattern detector |
US5388011A (en) * | 1992-05-20 | 1995-02-07 | Wangtek, Inc. | Peak detector with look ahead |
US5420726A (en) * | 1994-02-17 | 1995-05-30 | Maxtor Corporation | Channel qualifier for a hard disk drive which differentiates a raw data signal before peak detection and qualification of the signal |
EP1114391B1 (de) * | 1998-09-14 | 2009-07-08 | Datalogic Scanning, Inc. | Verfahren zur schnellen kantendetektion, beständig gegen hohe intersymbolstörung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3603942A (en) * | 1969-01-13 | 1971-09-07 | Ibm | Predifferentiated recording |
US3767938A (en) * | 1972-05-26 | 1973-10-23 | Ibm | Zero sense after peak detection circuit |
DE2925129A1 (de) * | 1979-06-22 | 1981-01-08 | Daimler Benz Ag | Vorrichtung zum regenerieren von signalen |
US4495529A (en) * | 1982-05-07 | 1985-01-22 | Digital Equipment Corporation | Qualifier circuit |
US4635142A (en) * | 1983-11-22 | 1987-01-06 | Storage Technology Corporation | Amplitude sensor with adaptive threshold generation |
JPS61120380A (ja) * | 1984-11-16 | 1986-06-07 | Sony Corp | デジタル信号処理回路 |
IE883775L (en) * | 1988-12-19 | 1990-06-19 | Ocorralk Ltd | Signal wave form converting circuit |
-
1988
- 1988-11-14 US US07/270,748 patent/US4987500A/en not_active Expired - Lifetime
-
1989
- 1989-11-13 EP EP89913192A patent/EP0449853B1/de not_active Expired - Lifetime
- 1989-11-13 WO PCT/US1989/005120 patent/WO1990005975A1/en active IP Right Grant
- 1989-11-13 DE DE68921349T patent/DE68921349T2/de not_active Expired - Fee Related
- 1989-11-13 AU AU46418/89A patent/AU4641889A/en not_active Abandoned
- 1989-11-13 JP JP2500432A patent/JP2741633B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0449853A4 (en) | 1992-06-03 |
JPH04504775A (ja) | 1992-08-20 |
US4987500A (en) | 1991-01-22 |
JP2741633B2 (ja) | 1998-04-22 |
EP0449853A1 (de) | 1991-10-09 |
DE68921349T2 (de) | 1995-10-05 |
AU4641889A (en) | 1990-06-12 |
WO1990005975A1 (en) | 1990-05-31 |
EP0449853B1 (de) | 1995-02-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |