CH437871A - Système de lecture et d'inscription, sur cartes magnétiques, de données numériques binaires - Google Patents
Système de lecture et d'inscription, sur cartes magnétiques, de données numériques binairesInfo
- Publication number
- CH437871A CH437871A CH751966A CH751966A CH437871A CH 437871 A CH437871 A CH 437871A CH 751966 A CH751966 A CH 751966A CH 751966 A CH751966 A CH 751966A CH 437871 A CH437871 A CH 437871A
- Authority
- CH
- Switzerland
- Prior art keywords
- digital data
- data reading
- writing system
- binary digital
- magnetic cards
- 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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
- G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
-
- 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)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45834465A | 1965-05-24 | 1965-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH437871A true CH437871A (fr) | 1967-06-15 |
Family
ID=23820428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH751966A CH437871A (fr) | 1965-05-24 | 1966-05-24 | Système de lecture et d'inscription, sur cartes magnétiques, de données numériques binaires |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3423744A (fr) |
| BE (1) | BE681395A (fr) |
| CH (1) | CH437871A (fr) |
| DE (1) | DE1499796B2 (fr) |
| GB (1) | GB1085962A (fr) |
| NL (1) | NL6607148A (fr) |
| SE (1) | SE300324B (fr) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3518700A (en) * | 1968-01-04 | 1970-06-30 | Ncr Co | Quadruple modulation recording system |
| DE2052050A1 (de) * | 1969-10-28 | 1971-05-19 | Fujitsu Ltd | Steueranordnung fur eine Magnet bandeinheit |
| US3641534A (en) * | 1969-12-29 | 1972-02-08 | Ibm | Intrarecord resynchronization in digital-recording systems |
| US3683288A (en) * | 1970-07-31 | 1972-08-08 | Texas Instruments Inc | Frequency modulation demodulator |
| US3742199A (en) * | 1970-09-21 | 1973-06-26 | Larse Corp | Binary code communication system |
| CA1057849A (fr) * | 1975-07-04 | 1979-07-03 | Toshio Kashio | Appareil de lecture et d'ecriture des donnees pour support d'enregistrement magnetique |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2813259A (en) * | 1954-04-12 | 1957-11-12 | Monroe Calculating Machine | Magnetic tape recording systems |
| US2972735A (en) * | 1955-05-04 | 1961-02-21 | Lab For Electronics Inc | Data processing |
-
1965
- 1965-05-24 US US458344A patent/US3423744A/en not_active Expired - Lifetime
-
1966
- 1966-04-28 GB GB18618/66A patent/GB1085962A/en not_active Expired
- 1966-05-21 DE DE1499796A patent/DE1499796B2/de active Pending
- 1966-05-23 SE SE7026/66A patent/SE300324B/xx unknown
- 1966-05-23 BE BE681395D patent/BE681395A/xx unknown
- 1966-05-24 NL NL6607148A patent/NL6607148A/xx unknown
- 1966-05-24 CH CH751966A patent/CH437871A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL6607148A (fr) | 1966-11-25 |
| US3423744A (en) | 1969-01-21 |
| DE1499796B2 (de) | 1975-08-14 |
| BE681395A (fr) | 1966-10-31 |
| SE300324B (fr) | 1968-04-22 |
| DE1499796A1 (de) | 1970-04-02 |
| GB1085962A (en) | 1967-10-04 |
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