FR2272458A1 - Rotary head magnetic recorder for coded messages - has transducer head attached to shaft coaxial to recording track - Google Patents

Rotary head magnetic recorder for coded messages - has transducer head attached to shaft coaxial to recording track

Info

Publication number
FR2272458A1
FR2272458A1 FR7417626A FR7417626A FR2272458A1 FR 2272458 A1 FR2272458 A1 FR 2272458A1 FR 7417626 A FR7417626 A FR 7417626A FR 7417626 A FR7417626 A FR 7417626A FR 2272458 A1 FR2272458 A1 FR 2272458A1
Authority
FR
France
Prior art keywords
transducer head
recording track
shaft coaxial
magnetic recorder
coded messages
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
FR7417626A
Other languages
English (en)
French (fr)
Other versions
FR2272458B1 (enExample
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 FR7417626A priority Critical patent/FR2272458A1/fr
Publication of FR2272458A1 publication Critical patent/FR2272458A1/fr
Application granted granted Critical
Publication of FR2272458B1 publication Critical patent/FR2272458B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/125—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by magnetic means
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
FR7417626A 1974-05-21 1974-05-21 Rotary head magnetic recorder for coded messages - has transducer head attached to shaft coaxial to recording track Granted FR2272458A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7417626A FR2272458A1 (en) 1974-05-21 1974-05-21 Rotary head magnetic recorder for coded messages - has transducer head attached to shaft coaxial to recording track

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7417626A FR2272458A1 (en) 1974-05-21 1974-05-21 Rotary head magnetic recorder for coded messages - has transducer head attached to shaft coaxial to recording track

Publications (2)

Publication Number Publication Date
FR2272458A1 true FR2272458A1 (en) 1975-12-19
FR2272458B1 FR2272458B1 (enExample) 1976-10-15

Family

ID=9139107

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7417626A Granted FR2272458A1 (en) 1974-05-21 1974-05-21 Rotary head magnetic recorder for coded messages - has transducer head attached to shaft coaxial to recording track

Country Status (1)

Country Link
FR (1) FR2272458A1 (enExample)

Also Published As

Publication number Publication date
FR2272458B1 (enExample) 1976-10-15

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Legal Events

Date Code Title Description
ST Notification of lapse