FR2270656A1 - - Google Patents
Info
- Publication number
- FR2270656A1 FR2270656A1 FR7427495A FR7427495A FR2270656A1 FR 2270656 A1 FR2270656 A1 FR 2270656A1 FR 7427495 A FR7427495 A FR 7427495A FR 7427495 A FR7427495 A FR 7427495A FR 2270656 A1 FR2270656 A1 FR 2270656A1
- Authority
- FR
- France
- 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
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
- G11B20/14—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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00402568A US3855616A (en) | 1973-10-01 | 1973-10-01 | Phase shift reducing digital signal recording having no d.c. component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2270656A1 true FR2270656A1 (enExample) | 1975-12-05 |
| FR2270656B1 FR2270656B1 (enExample) | 1976-10-22 |
Family
ID=23592447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7427495A Expired FR2270656B1 (enExample) | 1973-10-01 | 1974-08-02 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3855616A (enExample) |
| JP (1) | JPS5062419A (enExample) |
| DE (1) | DE2443394A1 (enExample) |
| FR (1) | FR2270656B1 (enExample) |
| GB (1) | GB1449412A (enExample) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3930265A (en) * | 1974-06-07 | 1975-12-30 | Vrc California | High density magnetic storage system |
| US4027335A (en) * | 1976-03-19 | 1977-05-31 | Ampex Corporation | DC free encoding for data transmission system |
| USRE31311E (en) * | 1976-03-19 | 1983-07-12 | Ampex Corporation | DC Free encoding for data transmission system |
| US4195318A (en) * | 1978-03-20 | 1980-03-25 | Sperry Corporation | High density bias linearized magnetic recording system utilizing Nyquist bandwidth partial response transmission |
| JPS5644109A (en) * | 1979-09-17 | 1981-04-23 | Toshiba Corp | Magnetic recording and reproducing system |
| JPS6430004A (en) * | 1987-07-27 | 1989-01-31 | Mitsubishi Electric Corp | Magnetic recording and reproducing system |
| US4954825A (en) * | 1989-03-22 | 1990-09-04 | Eastman Kodak Company | Self clocking binary data encoding/decoding method |
| US4951049A (en) * | 1989-03-22 | 1990-08-21 | Eastman Kodak Company | Self clocking binary information encoder |
| US5872665A (en) * | 1995-07-28 | 1999-02-16 | Hewlett-Packard Company | Programmable write equalization for magnetic data recording |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3277454A (en) * | 1963-12-23 | 1966-10-04 | Ampex | Binary code magnetic recording system |
| US3356934A (en) * | 1964-11-20 | 1967-12-05 | Ibm | Double frequency recording system |
-
1973
- 1973-10-01 US US00402568A patent/US3855616A/en not_active Expired - Lifetime
-
1974
- 1974-08-02 GB GB3427374A patent/GB1449412A/en not_active Expired
- 1974-08-02 FR FR7427495A patent/FR2270656B1/fr not_active Expired
- 1974-09-11 DE DE2443394A patent/DE2443394A1/de active Pending
- 1974-09-27 JP JP49110669A patent/JPS5062419A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5062419A (enExample) | 1975-05-28 |
| FR2270656B1 (enExample) | 1976-10-22 |
| US3855616A (en) | 1974-12-17 |
| GB1449412A (en) | 1976-09-15 |
| DE2443394A1 (de) | 1975-04-03 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |