CA1150398A - Digital frequency modulation and modified frequency modulation read recovery with data separation - Google Patents

Digital frequency modulation and modified frequency modulation read recovery with data separation

Info

Publication number
CA1150398A
CA1150398A CA000350880A CA350880A CA1150398A CA 1150398 A CA1150398 A CA 1150398A CA 000350880 A CA000350880 A CA 000350880A CA 350880 A CA350880 A CA 350880A CA 1150398 A CA1150398 A CA 1150398A
Authority
CA
Canada
Prior art keywords
data
signals
signal
generating
clock
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
CA000350880A
Other languages
English (en)
French (fr)
Inventor
David B. O'keefe
Donald J. Rathbun
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.)
Bull HN Information Systems Inc
Original Assignee
Honeywell Information Systems Inc
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 Honeywell Information Systems Inc filed Critical Honeywell Information Systems Inc
Application granted granted Critical
Publication of CA1150398A publication Critical patent/CA1150398A/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
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller 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
    • G11B20/1407—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)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Dc Digital Transmission (AREA)
CA000350880A 1979-05-14 1980-04-29 Digital frequency modulation and modified frequency modulation read recovery with data separation Expired CA1150398A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/038,767 US4320465A (en) 1979-05-14 1979-05-14 Digital frequency modulation and modified frequency modulation read recovery with data separation
US038,767 1993-04-08

Publications (1)

Publication Number Publication Date
CA1150398A true CA1150398A (en) 1983-07-19

Family

ID=21901778

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000350880A Expired CA1150398A (en) 1979-05-14 1980-04-29 Digital frequency modulation and modified frequency modulation read recovery with data separation

Country Status (6)

Country Link
US (1) US4320465A (https=)
JP (1) JPS55160316A (https=)
AU (1) AU546718B2 (https=)
CA (1) CA1150398A (https=)
FR (1) FR2457045A1 (https=)
GB (1) GB2050122B (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8606028D0 (en) * 1986-03-12 1986-04-16 Int Computers Ltd Decoder
GB2200518A (en) * 1987-01-30 1988-08-03 Crystalate Electronics Data pulse timing

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108261A (en) * 1960-04-11 1963-10-22 Ampex Recording and/or reproducing system
JPS505569A (https=) * 1973-05-18 1975-01-21
US3859510A (en) * 1973-12-26 1975-01-07 Ibm Data separation circuitry for reading information from a moving support
JPS5198006A (https=) * 1975-02-21 1976-08-28
US4000513A (en) * 1975-07-28 1976-12-28 Computer Peripherals, Inc. Apparatus and method for data recording with peak shift compensation
US4054950A (en) * 1976-04-29 1977-10-18 Ncr Corporation Apparatus for detecting a preamble in a bi-phase data recovery system
IT1072341B (it) * 1976-05-20 1985-04-10 Olivetti & Co Spa Circuito e metodo per la discriminazione in lettura di dati preregistrati con codici diversi
US4034348A (en) * 1976-06-28 1977-07-05 Honeywell Information Systems, Inc. Apparatus, including delay means, for sampling and recovering data recorded by the double transition recording technique
US4173027A (en) * 1977-12-20 1979-10-30 Honeywell Information Systems Inc. Write precompensation system
US4212038A (en) * 1978-01-03 1980-07-08 Honeywell Information Systems Inc. Double density read recovery

Also Published As

Publication number Publication date
GB2050122B (en) 1983-06-15
GB2050122A (en) 1980-12-31
AU5831880A (en) 1980-11-20
FR2457045B1 (https=) 1984-08-24
FR2457045A1 (fr) 1980-12-12
JPS55160316A (en) 1980-12-13
AU546718B2 (en) 1985-09-19
US4320465A (en) 1982-03-16

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Legal Events

Date Code Title Description
MKEX Expiry