FR2456977B1 - Dispositif pour ecrire des informations numeriques sur un support - Google Patents
Dispositif pour ecrire des informations numeriques sur un supportInfo
- Publication number
- FR2456977B1 FR2456977B1 FR8010590A FR8010590A FR2456977B1 FR 2456977 B1 FR2456977 B1 FR 2456977B1 FR 8010590 A FR8010590 A FR 8010590A FR 8010590 A FR8010590 A FR 8010590A FR 2456977 B1 FR2456977 B1 FR 2456977B1
- Authority
- FR
- France
- Prior art keywords
- medium
- digital information
- writing digital
- writing
- information
- 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
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
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10194—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using predistortion during writing
-
- 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
-
- 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
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
- G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Digital Magnetic Recording (AREA)
- Dc Digital Transmission (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/039,054 US4245263A (en) | 1979-05-14 | 1979-05-14 | Write precompensation and write encoding for FM and MFM recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2456977A1 FR2456977A1 (fr) | 1980-12-12 |
| FR2456977B1 true FR2456977B1 (fr) | 1987-03-20 |
Family
ID=21903415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8010590A Expired FR2456977B1 (fr) | 1979-05-14 | 1980-05-12 | Dispositif pour ecrire des informations numeriques sur un support |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4245263A (fr) |
| JP (1) | JPS55153115A (fr) |
| AU (1) | AU546005B2 (fr) |
| CA (1) | CA1172767A (fr) |
| DE (1) | DE3018027C2 (fr) |
| FR (1) | FR2456977B1 (fr) |
| GB (1) | GB2049369B (fr) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS563421A (en) * | 1979-06-21 | 1981-01-14 | Canon Inc | Signal converting device |
| US4398225A (en) * | 1981-04-24 | 1983-08-09 | Iomega Corporation | Combined serializer encoder and decoder for data storage system |
| US4506252A (en) * | 1981-05-05 | 1985-03-19 | Sperry Corporation | Ternary data encoding system |
| JPS5876315A (ja) * | 1981-10-29 | 1983-05-09 | Mazda Motor Corp | 自動車のストラツト式サスペンシヨン |
| JPS58141410A (ja) * | 1982-02-17 | 1983-08-22 | Usac Electronics Ind Co Ltd | 磁気記録装置におけるビツトシフト補償書込み回路 |
| US4635141A (en) * | 1982-10-13 | 1987-01-06 | United States Design Corporation | Method and apparatus for storing data on magnetic or optical media |
| JPS5977607A (ja) * | 1982-10-27 | 1984-05-04 | Hitachi Ltd | 記録タイミング補正方式 |
| US4731738A (en) * | 1983-02-14 | 1988-03-15 | Honeywell Information Systems Inc. | Memory timing and control apparatus |
| US4544963A (en) * | 1984-01-16 | 1985-10-01 | Sperry Corporation | Read signal detection in ternary 3PM magnetic recording |
| US5025327A (en) * | 1986-10-17 | 1991-06-18 | Unisys Corp. | Magnetic disk write precompensation method and apparatus which takes into account variations in head/disk characteristics |
| WO1989002643A1 (fr) * | 1987-09-21 | 1989-03-23 | Unisys Corporation | Techniques de precompensation d'ecriture pour enregistrement magnetique |
| US5325241A (en) * | 1991-06-14 | 1994-06-28 | Fujitsu Limited | Write precompensation with frequency synthesizer |
| US5335118A (en) * | 1992-07-22 | 1994-08-02 | Seagate Technology, Inc. | Disc drive with write precompensation using window/pulse timing measurements |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3879342A (en) * | 1973-12-28 | 1975-04-22 | Honeywell Inf Systems | Pre-recorded digital data compensation system |
| US4000513A (en) * | 1975-07-28 | 1976-12-28 | Computer Peripherals, Inc. | Apparatus and method for data recording with peak shift compensation |
| US4000512A (en) * | 1975-12-17 | 1976-12-28 | Redactron Corporation | Width modulated magnetic recording |
| US4034348A (en) * | 1976-06-28 | 1977-07-05 | Honeywell Information Systems, Inc. | Apparatus, including delay means, for sampling and recovering data recorded by the double transition recording technique |
| AU3825078A (en) * | 1977-10-17 | 1980-01-24 | Sundstrand Data Control | Servoed accelerometer |
| GB2016762B (en) * | 1978-03-16 | 1982-08-25 | Tektronix Inc | Data encoder with write precompensation |
-
1979
- 1979-05-14 US US06/039,054 patent/US4245263A/en not_active Expired - Lifetime
-
1980
- 1980-04-11 GB GB8011996A patent/GB2049369B/en not_active Expired
- 1980-04-29 CA CA000350882A patent/CA1172767A/fr not_active Expired
- 1980-05-10 DE DE3018027A patent/DE3018027C2/de not_active Expired
- 1980-05-12 AU AU58317/80A patent/AU546005B2/en not_active Ceased
- 1980-05-12 FR FR8010590A patent/FR2456977B1/fr not_active Expired
- 1980-05-13 JP JP6330380A patent/JPS55153115A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2456977A1 (fr) | 1980-12-12 |
| CA1172767A (fr) | 1984-08-14 |
| JPS55153115A (en) | 1980-11-28 |
| AU5831780A (en) | 1980-11-20 |
| DE3018027A1 (de) | 1980-11-27 |
| GB2049369A (en) | 1980-12-17 |
| GB2049369B (en) | 1983-06-15 |
| US4245263A (en) | 1981-01-13 |
| JPH0248991B2 (fr) | 1990-10-26 |
| AU546005B2 (en) | 1985-08-08 |
| DE3018027C2 (de) | 1987-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse | ||
| AR | Application made for restoration | ||
| CD | Change of name or company name | ||
| BR | Restoration of rights | ||
| ST | Notification of lapse |