IT1091253B - Dispositivo per la codifica di informazioni in una pluralita di codici di regiastrazione e per la precompensazione degli errori in fase di scrittura - Google Patents
Dispositivo per la codifica di informazioni in una pluralita di codici di regiastrazione e per la precompensazione degli errori in fase di scritturaInfo
- Publication number
- IT1091253B IT1091253B IT69162/77A IT6916277A IT1091253B IT 1091253 B IT1091253 B IT 1091253B IT 69162/77 A IT69162/77 A IT 69162/77A IT 6916277 A IT6916277 A IT 6916277A IT 1091253 B IT1091253 B IT 1091253B
- Authority
- IT
- Italy
- Prior art keywords
- errors
- compensation
- coding
- information
- writing phase
- Prior art date
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
- G11B20/10009—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)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Digital Magnetic Recording (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT69162/77A IT1091253B (it) | 1977-09-30 | 1977-09-30 | Dispositivo per la codifica di informazioni in una pluralita di codici di regiastrazione e per la precompensazione degli errori in fase di scrittura |
| GB7836560A GB2006489B (en) | 1977-09-30 | 1978-09-12 | Arrangement for encoding and recording information |
| US05/941,935 US4205352A (en) | 1977-09-30 | 1978-09-13 | Device for encoding and recording information with peak shift compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT69162/77A IT1091253B (it) | 1977-09-30 | 1977-09-30 | Dispositivo per la codifica di informazioni in una pluralita di codici di regiastrazione e per la precompensazione degli errori in fase di scrittura |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT1091253B true IT1091253B (it) | 1985-07-06 |
Family
ID=11311466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT69162/77A IT1091253B (it) | 1977-09-30 | 1977-09-30 | Dispositivo per la codifica di informazioni in una pluralita di codici di regiastrazione e per la precompensazione degli errori in fase di scrittura |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4205352A (it) |
| GB (1) | GB2006489B (it) |
| IT (1) | IT1091253B (it) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4334250A (en) * | 1978-03-16 | 1982-06-08 | Tektronix, Inc. | MFM data encoder with write precompensation |
| US4481549A (en) * | 1979-09-12 | 1984-11-06 | Tektronix, Inc. | MFM data encoder with write precompensation |
| US4281356A (en) * | 1979-11-28 | 1981-07-28 | R. C. Sanders Technology Systems, Inc. | Magnetic disk memory |
| US4388656A (en) * | 1980-10-03 | 1983-06-14 | Eastman Kodak Company | Multitrack recording with minimal intermodulation |
| JPS5987610A (ja) * | 1982-11-10 | 1984-05-21 | Fujitsu Ltd | 書込デ−タのプリシフト回路 |
| JPS6352307A (ja) * | 1986-08-20 | 1988-03-05 | Toshiba Corp | 磁気デイスク装置 |
| US5159501A (en) * | 1989-03-03 | 1992-10-27 | Seagate Technology, Inc. | Adaptive prewrite compensation apparatus and method |
| US5241429A (en) * | 1989-03-03 | 1993-08-31 | Seagate Technology, Inc. | Adaptive prewrite compensation apparatus and method |
| US5047876A (en) * | 1989-03-03 | 1991-09-10 | Seagate Technology Inc. | Adaptive prewrite compensation apparatus |
| US5335118A (en) * | 1992-07-22 | 1994-08-02 | Seagate Technology, Inc. | Disc drive with write precompensation using window/pulse timing measurements |
| US6268974B1 (en) | 1998-07-13 | 2001-07-31 | Seagate Technology Llc | Gain optimization in a disc drive |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3067422A (en) * | 1958-12-24 | 1962-12-04 | Ibm | Phase distortion correction for high density magnetic recording |
| 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 |
-
1977
- 1977-09-30 IT IT69162/77A patent/IT1091253B/it active
-
1978
- 1978-09-12 GB GB7836560A patent/GB2006489B/en not_active Expired
- 1978-09-13 US US05/941,935 patent/US4205352A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB2006489A (en) | 1979-05-02 |
| GB2006489B (en) | 1982-05-19 |
| US4205352A (en) | 1980-05-27 |
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