FR2420250A1 - CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION - Google Patents

CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION

Info

Publication number
FR2420250A1
FR2420250A1 FR7907080A FR7907080A FR2420250A1 FR 2420250 A1 FR2420250 A1 FR 2420250A1 FR 7907080 A FR7907080 A FR 7907080A FR 7907080 A FR7907080 A FR 7907080A FR 2420250 A1 FR2420250 A1 FR 2420250A1
Authority
FR
France
Prior art keywords
phase modulation
precompensation
writing
procedure
circuit
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
FR7907080A
Other languages
French (fr)
Other versions
FR2420250B1 (en
Inventor
John Gould Theus
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.)
Tektronix Inc
Original Assignee
Tektronix 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 Tektronix Inc filed Critical Tektronix Inc
Publication of FR2420250A1 publication Critical patent/FR2420250A1/en
Application granted granted Critical
Publication of FR2420250B1 publication Critical patent/FR2420250B1/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
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10194—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using predistortion during writing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Digital Magnetic Recording (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Dc Digital Transmission (AREA)

Abstract

L'invention se rapporte au codage de données à modulation de phase modifiée. Ce codage comporte : une mémoire 4 pour stocker des mots de 8 bits représentant la sortie codée avec précompensation à l'écriture; un moyen d'entrée série-parallèle 2; et un moyen 6 couplé à la sortie de la mémoire, pour convertir de parallèle en série et former la sortie de bits en série, sous la commande de bascules 8, 10. Application : enregistrement sur bandes ou disques magnétiques.The invention relates to the coding of data with modified phase modulation. This encoding comprises: a memory 4 for storing 8-bit words representing the output encoded with write precompensation; a series-parallel input means 2; and means 6 coupled to the output of the memory, for converting from parallel to series and forming the output of bits to series, under the control of flip-flops 8, 10. Application: recording on magnetic tapes or disks.

FR7907080A 1978-03-16 1979-03-14 CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION Granted FR2420250A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88740378A 1978-03-16 1978-03-16

Publications (2)

Publication Number Publication Date
FR2420250A1 true FR2420250A1 (en) 1979-10-12
FR2420250B1 FR2420250B1 (en) 1983-08-12

Family

ID=25391063

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7907080A Granted FR2420250A1 (en) 1978-03-16 1979-03-14 CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION

Country Status (6)

Country Link
JP (1) JPS59888B2 (en)
CA (1) CA1172766A (en)
DE (1) DE2909822C2 (en)
FR (1) FR2420250A1 (en)
GB (1) GB2016762B (en)
NL (1) NL7902070A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456977A1 (en) * 1979-05-14 1980-12-12 Honeywell Inf Systems DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3326912A1 (en) * 1983-07-26 1985-02-07 Siemens AG, 1000 Berlin und 8000 München Device for code conversion
US4756008A (en) * 1986-03-03 1988-07-05 Hitachi, Ltd. Digitized quadrature phase shift keying modulator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067422A (en) * 1958-12-24 1962-12-04 Ibm Phase distortion correction for high density magnetic recording
FR1504669A (en) * 1965-10-21 1967-12-08 Sperry Rand Corp Write circuit for a phase modulation system
FR2103471A1 (en) * 1970-08-24 1972-04-14 Honeywell Inf Systems
US3879342A (en) * 1973-12-28 1975-04-22 Honeywell Inf Systems Pre-recorded digital data compensation system
FR2319935A1 (en) * 1975-07-28 1977-02-25 Ncr Co DATA RECORDING APPARATUS FOR RECORDING DATA SIGNALS ON A MAGNETIC RECORDING MEDIA

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067422A (en) * 1958-12-24 1962-12-04 Ibm Phase distortion correction for high density magnetic recording
FR1504669A (en) * 1965-10-21 1967-12-08 Sperry Rand Corp Write circuit for a phase modulation system
FR2103471A1 (en) * 1970-08-24 1972-04-14 Honeywell Inf Systems
US3879342A (en) * 1973-12-28 1975-04-22 Honeywell Inf Systems Pre-recorded digital data compensation system
FR2319935A1 (en) * 1975-07-28 1977-02-25 Ncr Co DATA RECORDING APPARATUS FOR RECORDING DATA SIGNALS ON A MAGNETIC RECORDING MEDIA

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXBK/74 *
EXBK/76 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456977A1 (en) * 1979-05-14 1980-12-12 Honeywell Inf Systems DEVICE FOR WRITING DIGITAL INFORMATION ON A MEDIUM

Also Published As

Publication number Publication date
NL7902070A (en) 1979-09-18
GB2016762B (en) 1982-08-25
JPS59888B2 (en) 1984-01-09
DE2909822C2 (en) 1982-06-03
FR2420250B1 (en) 1983-08-12
DE2909822A1 (en) 1979-09-20
CA1172766A (en) 1984-08-14
JPS54133019A (en) 1979-10-16
GB2016762A (en) 1979-09-26

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Legal Events

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