FR1179763A - Perfectionnements aux dispositifs d'enregistrement de signaux binaires - Google Patents

Perfectionnements aux dispositifs d'enregistrement de signaux binaires

Info

Publication number
FR1179763A
FR1179763A FR1179763DA FR1179763A FR 1179763 A FR1179763 A FR 1179763A FR 1179763D A FR1179763D A FR 1179763DA FR 1179763 A FR1179763 A FR 1179763A
Authority
FR
France
Prior art keywords
signal recording
binary signal
recording devices
devices
binary
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.)
Expired
Application number
Other languages
English (en)
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.)
Sperry Corp
Original Assignee
Sperry Rand 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.)
Filing date
Publication date
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Application granted granted Critical
Publication of FR1179763A publication Critical patent/FR1179763A/fr
Expired 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
    • 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)
  • Digital Magnetic Recording (AREA)
FR1179763D 1956-07-30 1957-07-23 Perfectionnements aux dispositifs d'enregistrement de signaux binaires Expired FR1179763A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US600752A US2972128A (en) 1956-07-30 1956-07-30 Phase modulated pulse recording systems

Publications (1)

Publication Number Publication Date
FR1179763A true FR1179763A (fr) 1959-05-28

Family

ID=24404912

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1179763D Expired FR1179763A (fr) 1956-07-30 1957-07-23 Perfectionnements aux dispositifs d'enregistrement de signaux binaires

Country Status (4)

Country Link
US (1) US2972128A (fr)
DE (1) DE1065464B (fr)
FR (1) FR1179763A (fr)
GB (1) GB853202A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257836A (fr) * 1960-02-26 1961-04-07 Compteurs Comp D Procédé d'enregistrement de signaux codés sur un support magnétique
NL296914A (fr) * 1962-08-21
US3209328A (en) * 1963-02-28 1965-09-28 Ibm Adaptive recognition system for recognizing similar patterns
US3349370A (en) * 1964-03-10 1967-10-24 Gen Precision Systems Inc Write amplifier circuit
US3740491A (en) * 1971-04-23 1973-06-19 Stilwell R Digital magnetic tape recoring system using symmetrical differential pulse width modulation with a triangular reference signal

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540654A (en) * 1948-03-25 1951-02-06 Engineering Res Associates Inc Data storage system
US2611813A (en) * 1948-05-26 1952-09-23 Technitrol Engineering Company Magnetic data storage system
US2702315A (en) * 1951-05-01 1955-02-15 Rca Corp Sound record transfer method and system
NL105528C (fr) * 1952-04-29
US2721990A (en) * 1952-10-17 1955-10-25 Gen Dynamics Corp Apparatus for locating information in a magnetic tape
NL104332C (fr) * 1953-04-20
US2782398A (en) * 1953-08-28 1957-02-19 Raytheon Mfg Co Apparatus for photoelectrically cataloging digital data on magnetic tape

Also Published As

Publication number Publication date
US2972128A (en) 1961-02-14
GB853202A (en) 1960-11-02
DE1065464B (de) 1959-09-17

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