GB1017583A - Improvements relating to the magnetic recording of digital data - Google Patents

Improvements relating to the magnetic recording of digital data

Info

Publication number
GB1017583A
GB1017583A GB32749/62A GB3274962A GB1017583A GB 1017583 A GB1017583 A GB 1017583A GB 32749/62 A GB32749/62 A GB 32749/62A GB 3274962 A GB3274962 A GB 3274962A GB 1017583 A GB1017583 A GB 1017583A
Authority
GB
United Kingdom
Prior art keywords
recording
waveform
rectangular waveform
binary
digital data
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
Application number
GB32749/62A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1017583A publication Critical patent/GB1017583A/en
Expired legal-status Critical Current

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)
GB32749/62A 1961-09-11 1962-08-27 Improvements relating to the magnetic recording of digital data Expired GB1017583A (en)

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
GB1017583A true GB1017583A (en) 1966-01-19

Family

ID=22476965

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32749/62A Expired GB1017583A (en) 1961-09-11 1962-08-27 Improvements relating to the magnetic recording of digital data

Country Status (9)

Country Link
US (1) US3228016A (en:Method)
AT (1) AT238977B (en:Method)
BE (1) BE622205A (en:Method)
CH (1) CH411037A (en:Method)
DK (1) DK111383B (en:Method)
FR (1) FR1340341A (en:Method)
GB (1) GB1017583A (en:Method)
NL (1) NL283021A (en:Method)
NO (1) NO115004B (en:Method)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
DK111383B (da) 1968-08-12
FR1340341A (fr) 1963-10-18
NO115004B (en:Method) 1968-07-01
AT238977B (de) 1965-03-10
CH411037A (de) 1966-04-15
NL283021A (en:Method) 1900-01-01
BE622205A (en:Method)
US3228016A (en) 1966-01-04

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