GB1338993A - Digital recording system - Google Patents

Digital recording system

Info

Publication number
GB1338993A
GB1338993A GB815072A GB815072A GB1338993A GB 1338993 A GB1338993 A GB 1338993A GB 815072 A GB815072 A GB 815072A GB 815072 A GB815072 A GB 815072A GB 1338993 A GB1338993 A GB 1338993A
Authority
GB
United Kingdom
Prior art keywords
data
train
output
preamble
phase
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
GB815072A
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.)
Singer Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Publication of GB1338993A publication Critical patent/GB1338993A/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
    • 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
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
GB815072A 1971-04-30 1972-02-22 Digital recording system Expired GB1338993A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13911071A 1971-04-30 1971-04-30

Publications (1)

Publication Number Publication Date
GB1338993A true GB1338993A (en) 1973-11-28

Family

ID=22485177

Family Applications (1)

Application Number Title Priority Date Filing Date
GB815072A Expired GB1338993A (en) 1971-04-30 1972-02-22 Digital recording system

Country Status (6)

Country Link
US (1) US3699556A (enExample)
CA (1) CA954623A (enExample)
DE (1) DE2211244A1 (enExample)
FR (1) FR2134708A1 (enExample)
GB (1) GB1338993A (enExample)
IT (1) IT953684B (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234898A (en) * 1978-03-15 1980-11-18 Nippon Hoso Kyokai Digital magnetic recording and reproducing apparatus
US4394695A (en) * 1981-02-02 1983-07-19 Sharp Corporation Method and apparatus for evaluating recording systems

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB954942A (en) * 1961-02-01 1964-04-08 Potter Instrument Co Inc Improvements in or relating to high density recording systems
US3164815A (en) * 1962-06-29 1965-01-05 Ibm Digital data detection circuitry
US3271750A (en) * 1962-12-13 1966-09-06 Ibm Binary data detecting system
US3323115A (en) * 1964-08-31 1967-05-30 Anelex Corp Reproducing system for phase modulated magnetically recorded data
US3518648A (en) * 1966-11-07 1970-06-30 Subscription Television Inc High density record and reproduce system
US3603942A (en) * 1969-01-13 1971-09-07 Ibm Predifferentiated recording

Also Published As

Publication number Publication date
US3699556A (en) 1972-10-17
FR2134708A1 (enExample) 1972-12-08
IT953684B (it) 1973-08-10
DE2211244A1 (de) 1972-11-09
CA954623A (en) 1974-09-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee