FR2452148A1 - Procede d'enregistrement magnetique - Google Patents

Procede d'enregistrement magnetique

Info

Publication number
FR2452148A1
FR2452148A1 FR7907111A FR7907111A FR2452148A1 FR 2452148 A1 FR2452148 A1 FR 2452148A1 FR 7907111 A FR7907111 A FR 7907111A FR 7907111 A FR7907111 A FR 7907111A FR 2452148 A1 FR2452148 A1 FR 2452148A1
Authority
FR
France
Prior art keywords
recording
credit card
speed
gate
independent
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.)
Withdrawn
Application number
FR7907111A
Other languages
English (en)
Inventor
Gerard Bauchet
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.)
Compagnie Generale dAutomatisme SA
Original Assignee
Compagnie Generale dAutomatisme SA
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 Compagnie Generale dAutomatisme SA filed Critical Compagnie Generale dAutomatisme SA
Priority to FR7907111A priority Critical patent/FR2452148A1/fr
Publication of FR2452148A1 publication Critical patent/FR2452148A1/fr
Withdrawn legal-status Critical Current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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/01—Details
    • G06K7/016—Synchronisation of sensing process
    • G06K7/0163—Synchronisation of sensing process by means of additional timing marks on the record-carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

L'INVENTION ENTRE DANS LE DOMAINE DE L'ENREGISTREMENT MAGNETIQUE. PROCEDE D'ENREGISTREMENT MAGNETIQUE D'UN MESSAGE SUR UNE PISTE AIMANTABLE DEPOSEE SUR UN SUPPORT DANS LEQUEL L'ETAT D'AIMANTATION D'UN ELEMENT DE PISTE ENREGISTRE NE PEUT PRENDRE QU'UN NOMBRE DISCRET D'ETATS, LES INTERVALLES SEPARANT LES TRANSITIONS ENTRE ETATS SUCCESSIFS NE POUVANT PRENDRE QU'UN NOMBRE DISCRET DE VALEURS MULTIPLES ENTIERES D'UNE MEME LONGUEUR UNITAIRE, CARACTERISE PAR UN PREMIER STADE D'ENREGISTREMENT DE SIGNAUX D'HORLOGE NON PORTEURS D'INFORMATION OU TOUS LES INTERVALLES ENTRE TRANSITIONS SUCCESSIVES SONT EGAUX A LA LONGUEUR UNITAIRE, ET PAR UN SECOND STADE D'ENREGISTREMENT OU L'ETAT D'AIMANTATION DE CHACUN DESDITS INTERVALLES EST MODIFIE OU MAINTENU EN FONCTION DE L'INFORMATION A ENREGISTRER, LEDIT SECOND STADE D'ENREGISTREMENT ETANT EFFECTUE PAR UN PREMIER CIRCUIT MAGNETIQUE D'ECRITURE, LA SYNCHRONISATION EN ETANT FOURNIE PAR UN SECOND CIRCUIT MAGNETIQUE DE LECTURE, LES ENTREFERS DESDITS CIRCUITS MAGNETIQUES ETANT PARALLELES ET D'ECARTEMENT CONSTANT, LEDIT SECOND CIRCUIT PRECEDANT LEDIT PREMIER CIRCUIT DANS LEUR MOUVEMENT RELATIF PAR RAPPORT A LA PISTE. L'INVENTION S'APPLIQUE EN PARTICULIER POUR L'ENREGISTREMENT MAGNETIQUE NUMERIQUE.
FR7907111A 1979-03-21 1979-03-21 Procede d'enregistrement magnetique Withdrawn FR2452148A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7907111A FR2452148A1 (fr) 1979-03-21 1979-03-21 Procede d'enregistrement magnetique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7907111A FR2452148A1 (fr) 1979-03-21 1979-03-21 Procede d'enregistrement magnetique

Publications (1)

Publication Number Publication Date
FR2452148A1 true FR2452148A1 (fr) 1980-10-17

Family

ID=9223390

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7907111A Withdrawn FR2452148A1 (fr) 1979-03-21 1979-03-21 Procede d'enregistrement magnetique

Country Status (1)

Country Link
FR (1) FR2452148A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241400A1 (de) * 1982-11-09 1984-05-10 Nixdorf Computer Ag, 4790 Paderborn Verfahren und einrichtung zur fortlaufenden aufzeichnung von informationssignalen vorbestimmter laenge auf eine magnetspeicherspur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926341A (en) * 1956-02-01 1960-02-23 Hughes Aircraft Co Automatic timing track recording apparatus
FR2015277A1 (fr) * 1968-08-08 1970-04-24 Nihon Doro Kodan
FR1601336A (fr) * 1968-01-15 1970-08-17
FR2243489A1 (fr) * 1973-09-12 1975-04-04 Burroughs Corp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926341A (en) * 1956-02-01 1960-02-23 Hughes Aircraft Co Automatic timing track recording apparatus
FR1601336A (fr) * 1968-01-15 1970-08-17
FR2015277A1 (fr) * 1968-08-08 1970-04-24 Nihon Doro Kodan
FR2243489A1 (fr) * 1973-09-12 1975-04-04 Burroughs Corp

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXBK/59 *
EXBK/78 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241400A1 (de) * 1982-11-09 1984-05-10 Nixdorf Computer Ag, 4790 Paderborn Verfahren und einrichtung zur fortlaufenden aufzeichnung von informationssignalen vorbestimmter laenge auf eine magnetspeicherspur
FR2535884A1 (fr) * 1982-11-09 1984-05-11 Nixdorf Computer Ag Procede et dispositif pour enregistrer en continu des signaux d'information de longueur predeterminee sur une piste magnetique

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Legal Events

Date Code Title Description
ST Notification of lapse