FR2457045A1 - Dispositif de recuperation de donnees dans les modes a modulation de frequence et a modulation de frequence modifiee - Google Patents

Dispositif de recuperation de donnees dans les modes a modulation de frequence et a modulation de frequence modifiee

Info

Publication number
FR2457045A1
FR2457045A1 FR8010592A FR8010592A FR2457045A1 FR 2457045 A1 FR2457045 A1 FR 2457045A1 FR 8010592 A FR8010592 A FR 8010592A FR 8010592 A FR8010592 A FR 8010592A FR 2457045 A1 FR2457045 A1 FR 2457045A1
Authority
FR
France
Prior art keywords
frequency modulation
data
recovery device
data recovery
modes
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.)
Granted
Application number
FR8010592A
Other languages
English (en)
French (fr)
Other versions
FR2457045B1 (https=
Inventor
Donald J Rathbun
David B O'keefe
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 Italia SpA
Bull HN Information Systems Inc
Original Assignee
Honeywell Information Systems Italia SpA
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 Italia SpA, Honeywell Information Systems Inc filed Critical Honeywell Information Systems Italia SpA
Publication of FR2457045A1 publication Critical patent/FR2457045A1/fr
Application granted granted Critical
Publication of FR2457045B1 publication Critical patent/FR2457045B1/fr
Granted 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)
FR8010592A 1979-05-14 1980-05-12 Dispositif de recuperation de donnees dans les modes a modulation de frequence et a modulation de frequence modifiee Granted FR2457045A1 (fr)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
FR2457045A1 true FR2457045A1 (fr) 1980-12-12
FR2457045B1 FR2457045B1 (https=) 1984-08-24

Family

ID=21901778

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8010592A Granted FR2457045A1 (fr) 1979-05-14 1980-05-12 Dispositif de recuperation de donnees dans les modes a modulation de frequence et a modulation de frequence modifiee

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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256595A1 (https=) * 1973-12-26 1975-07-25 Ibm
US4054950A (en) * 1976-04-29 1977-10-18 Ncr Corporation Apparatus for detecting a preamble in a bi-phase data recovery system
DE2723485A1 (de) * 1976-05-20 1977-12-08 Olivetti & Co Spa Schaltung fuer die trennscharfe unterscheidung waehrend des lesens von in verschiedenen codes vorher aufgezeichneten daten

Family Cites Families (7)

* 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
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
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256595A1 (https=) * 1973-12-26 1975-07-25 Ibm
US4054950A (en) * 1976-04-29 1977-10-18 Ncr Corporation Apparatus for detecting a preamble in a bi-phase data recovery system
DE2723485A1 (de) * 1976-05-20 1977-12-08 Olivetti & Co Spa Schaltung fuer die trennscharfe unterscheidung waehrend des lesens von in verschiedenen codes vorher aufgezeichneten daten

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol.14, no.12, mai 1972, NEW YORK (US) *
IBM TECHNICAL DISCLOSURE BULLETIN, vol.18, no.5, octobre 1975, NEW YORK (US) *
IBM TECHNICAL DISCLOSURE BULLETIN, vol.20, no.10, mars 1978, NEW YORK (US) *

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
CA1150398A (en) 1983-07-19
JPS55160316A (en) 1980-12-13
AU546718B2 (en) 1985-09-19
US4320465A (en) 1982-03-16

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Legal Events

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