BE755662A - Procede et appareil d'enregistrement et de detection magnetiques par modulation de frequence - Google Patents

Procede et appareil d'enregistrement et de detection magnetiques par modulation de frequence

Info

Publication number
BE755662A
BE755662A BE755662DA BE755662A BE 755662 A BE755662 A BE 755662A BE 755662D A BE755662D A BE 755662DA BE 755662 A BE755662 A BE 755662A
Authority
BE
Belgium
Prior art keywords
detection
magnetic recording
frequency modulation
modulation
frequency
Prior art date
Application number
Other languages
English (en)
Inventor
C Eldert
V J Quiogue
Original Assignee
Burroughs 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.)
Publication date
Publication of BE755662A publication Critical patent/BE755662A/fr

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
    • G11B20/1411—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 conversion to or from pulse width coding
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/02—Comparing digital values
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Analysis (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Analogue/Digital Conversion (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
BE755662D 1969-09-17 Procede et appareil d'enregistrement et de detection magnetiques par modulation de frequence BE755662A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85872769A 1969-09-17 1969-09-17

Publications (1)

Publication Number Publication Date
BE755662A true BE755662A (fr) 1971-02-15

Family

ID=25329023

Family Applications (1)

Application Number Title Priority Date Filing Date
BE755662D BE755662A (fr) 1969-09-17 Procede et appareil d'enregistrement et de detection magnetiques par modulation de frequence

Country Status (7)

Country Link
US (1) US3597752A (fr)
JP (1) JPS5019251B1 (fr)
BE (1) BE755662A (fr)
CA (1) CA930466A (fr)
FR (1) FR2060720A5 (fr)
GB (1) GB1334710A (fr)
NL (1) NL7012760A (fr)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708748A (en) * 1970-04-27 1973-01-02 Ibm Retrospective pulse modulation and apparatus therefor
CA1059632A (fr) * 1971-01-08 1979-07-31 Bruce W. Dobras Methode et systeme d'interpretation d'enregistrements codes
US3720927A (en) * 1971-01-25 1973-03-13 Redactron Corp Speed insensitive reading and writing apparatus for digital information
US3811033A (en) * 1971-06-29 1974-05-14 Monarch Marking Systems Inc Coded record interpreting system
JPS5129619B2 (fr) * 1971-08-05 1976-08-26
JPS4871873A (fr) * 1971-12-27 1973-09-28
US3737632A (en) * 1972-03-23 1973-06-05 R Barnes Rate adaptive nonsynchronous demodulator apparatus for biphase binary signals
US3810233A (en) * 1973-03-09 1974-05-07 Honeywell Inf Systems Apparatus to detect phase encoded data being read from a data storage subsystem
JPS507458A (fr) * 1973-05-18 1975-01-25
JPS566030B2 (fr) * 1973-08-31 1981-02-09
US3859510A (en) * 1973-12-26 1975-01-07 Ibm Data separation circuitry for reading information from a moving support
US3961367A (en) * 1974-07-03 1976-06-01 Rca Corporation Self-clocking, error correcting low bandwidth digital recording system
US3974523A (en) * 1974-09-30 1976-08-10 Hewlett-Packard Company Speed invariant decoding of digital information from a magnetic tape
US4060837A (en) * 1976-04-26 1977-11-29 Minnesota Mining And Manufacturing Company Variable cell width recording
US4264934A (en) * 1979-04-23 1981-04-28 Bell Telephone Laboratories, Incorporated Rate adaptive writer for a card having a magnetizable surface
EP0077075B1 (fr) * 1981-10-14 1986-07-16 Hitachi, Ltd. Lecteur numérique pour la reproduction d'une séquence de signals numérique
JPS6025062A (ja) * 1983-07-21 1985-02-07 Sony Corp 番地信号の記録方法
JPS60124153U (ja) * 1984-01-31 1985-08-21 パイオニア株式会社 デ−タ信号読取り装置
EP0171948B1 (fr) * 1984-08-09 1990-12-27 Kronos, Inc. Méthode de codage numérique à longueur fixe et dispositif utilisant cette méthode
DE3650166D1 (de) * 1986-02-13 1995-01-19 Kronos Inc Vorrichtung zur binären Festlängen-Kodierung und Dekodierung.
FR2624678B1 (fr) * 1987-12-09 1993-09-10 France Etat Procede et circuit de regeneration de donnees serialisees transmises en bande de base avec codage a deux niveaux
GB2224911A (en) * 1988-11-09 1990-05-16 Philips Nv Method of and apparatus for assigning binary values to sample values
US4964139A (en) * 1989-04-27 1990-10-16 Eastman Kodak Company Multi-purpose circuit for decoding binary information
US5623376A (en) * 1991-04-03 1997-04-22 Canon Kabushiki Kaisha Digital information restoring device including period detector
US6304985B1 (en) * 1998-09-22 2001-10-16 Qualcomm Incorporated Coding system having state machine based interleaver
US7903600B2 (en) * 2007-07-05 2011-03-08 Mediatek Inc. Control of CDMA signal integration

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281806A (en) * 1962-12-21 1966-10-25 Honeywell Inc Pulse width modulation representation of paired binary digits
US3483539A (en) * 1966-03-11 1969-12-09 Potter Instrument Co Inc Pulse repositioning system

Also Published As

Publication number Publication date
DE2043413A1 (de) 1971-04-08
US3597752A (en) 1971-08-03
JPS5019251B1 (fr) 1975-07-05
NL7012760A (fr) 1971-03-19
DE2043413B2 (de) 1976-04-08
GB1334710A (en) 1973-10-24
CA930466A (en) 1973-07-17
FR2060720A5 (fr) 1971-06-18

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