FR1485875A - System for magnetic recording and reproduction of digital information - Google Patents

System for magnetic recording and reproduction of digital information

Info

Publication number
FR1485875A
FR1485875A FR67418A FR67418A FR1485875A FR 1485875 A FR1485875 A FR 1485875A FR 67418 A FR67418 A FR 67418A FR 67418 A FR67418 A FR 67418A FR 1485875 A FR1485875 A FR 1485875A
Authority
FR
France
Prior art keywords
reproduction
magnetic recording
digital information
digital
information
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
FR67418A
Other languages
French (fr)
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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
Priority claimed from US467841A external-priority patent/US3414894A/en
Application filed by RCA Corp, Radio Corporation of America filed Critical RCA Corp
Priority to FR67418A priority Critical patent/FR1485875A/en
Application granted granted Critical
Publication of FR1485875A publication Critical patent/FR1485875A/en
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
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • 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
    • 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
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes
FR67418A 1965-06-29 1966-06-29 System for magnetic recording and reproduction of digital information Expired FR1485875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR67418A FR1485875A (en) 1965-06-29 1966-06-29 System for magnetic recording and reproduction of digital information

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US46793265A 1965-06-29 1965-06-29
US46793165A 1965-06-29 1965-06-29
US467841A US3414894A (en) 1965-06-29 1965-06-29 Magnetic recording and reproducing of digital information
FR67418A FR1485875A (en) 1965-06-29 1966-06-29 System for magnetic recording and reproduction of digital information

Publications (1)

Publication Number Publication Date
FR1485875A true FR1485875A (en) 1967-06-23

Family

ID=27444660

Family Applications (1)

Application Number Title Priority Date Filing Date
FR67418A Expired FR1485875A (en) 1965-06-29 1966-06-29 System for magnetic recording and reproduction of digital information

Country Status (1)

Country Link
FR (1) FR1485875A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426940A1 (en) * 1978-05-26 1979-12-21 Cii Honeywell Bull METHOD OF CHECKING THE REFERENCE ZONES OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426940A1 (en) * 1978-05-26 1979-12-21 Cii Honeywell Bull METHOD OF CHECKING THE REFERENCE ZONES OF AN INFORMATION MEDIA AND DEVICE FOR IMPLEMENTING IT

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