NO115004B - - Google Patents
Download PDFInfo
- Publication number
- NO115004B NO115004B NO145661A NO14566162A NO115004B NO 115004 B NO115004 B NO 115004B NO 145661 A NO145661 A NO 145661A NO 14566162 A NO14566162 A NO 14566162A NO 115004 B NO115004 B NO 115004B
- Authority
- NO
- Norway
- Prior art keywords
- binary
- signals
- recording
- information
- alternating current
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 25
- 230000005415 magnetization Effects 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 description 16
- 230000001360 synchronised effect Effects 0.000 description 16
- 239000004020 conductor Substances 0.000 description 14
- 230000007704 transition Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
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 |
|---|---|---|---|
| US137342A US3228016A (en) | 1961-09-11 | 1961-09-11 | Method and apparatus for high density digital data magnetic recording |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO115004B true NO115004B (da) | 1968-07-01 |
Family
ID=22476965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO145661A NO115004B (da) | 1961-09-11 | 1962-09-10 |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3228016A (da) |
| AT (1) | AT238977B (da) |
| BE (1) | BE622205A (da) |
| CH (1) | CH411037A (da) |
| DK (1) | DK111383B (da) |
| FR (1) | FR1340341A (da) |
| GB (1) | GB1017583A (da) |
| NL (1) | NL283021A (da) |
| NO (1) | NO115004B (da) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3438018A (en) * | 1964-12-23 | 1969-04-08 | Ibm | Apparatus and method for magnetic recording |
| US3518648A (en) * | 1966-11-07 | 1970-06-30 | Subscription Television Inc | High density record and reproduce system |
| US3810236A (en) * | 1972-04-12 | 1974-05-07 | Sperry Rand Corp | Data recording and verification system |
| US4314289A (en) * | 1979-12-07 | 1982-02-02 | International Business Machines Corporation | Biased pulsed recording systems and methods |
| DE3545601A1 (de) * | 1985-12-21 | 1987-07-02 | Gen Service Electronics Gmbh | Verfahren zur uebertragung von bitsignalen, bitsignalgeber und bitsignalempfaenger zur durchfuehrung des verfahrens sowie nach dem verfahren bespielter aufzeichnungstraeger |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2628287A (en) * | 1951-02-16 | 1953-02-10 | Nathan M Haynes | Magnetic recording apparatus |
| US2887674A (en) * | 1953-05-14 | 1959-05-19 | Marchant Res Inc | Pulse width memory units |
| US2933724A (en) * | 1954-11-09 | 1960-04-19 | North American Aviation Inc | Magnetic recording data analyzer |
| US3012234A (en) * | 1958-01-16 | 1961-12-05 | Jersey Prod Res Co | Noise reduction in pulse-width modulated recording |
-
0
- NL NL283021D patent/NL283021A/xx unknown
- BE BE622205D patent/BE622205A/xx unknown
-
1961
- 1961-09-11 US US137342A patent/US3228016A/en not_active Expired - Lifetime
-
1962
- 1962-08-27 GB GB32749/62A patent/GB1017583A/en not_active Expired
- 1962-09-10 FR FR908987A patent/FR1340341A/fr not_active Expired
- 1962-09-10 AT AT719662A patent/AT238977B/de active
- 1962-09-10 NO NO145661A patent/NO115004B/no unknown
- 1962-09-10 CH CH1072162A patent/CH411037A/de unknown
- 1962-09-11 DK DK397562AA patent/DK111383B/da unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE622205A (da) | |
| US3228016A (en) | 1966-01-04 |
| DK111383B (da) | 1968-08-12 |
| NL283021A (da) | 1900-01-01 |
| FR1340341A (fr) | 1963-10-18 |
| GB1017583A (en) | 1966-01-19 |
| CH411037A (de) | 1966-04-15 |
| AT238977B (de) | 1965-03-10 |
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