GB2112235B - Improved floppy disk data separator - Google Patents

Improved floppy disk data separator

Info

Publication number
GB2112235B
GB2112235B GB08219492A GB8219492A GB2112235B GB 2112235 B GB2112235 B GB 2112235B GB 08219492 A GB08219492 A GB 08219492A GB 8219492 A GB8219492 A GB 8219492A GB 2112235 B GB2112235 B GB 2112235B
Authority
GB
United Kingdom
Prior art keywords
floppy disk
disk data
data separator
improved floppy
improved
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
GB08219492A
Other versions
GB2112235A (en
Inventor
John M Zapisek
Jr John F Tweedy
Gus Giulekas
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.)
Standard Microsystems LLC
Original Assignee
Standard Microsystems LLC
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 Standard Microsystems LLC filed Critical Standard Microsystems LLC
Publication of GB2112235A publication Critical patent/GB2112235A/en
Application granted granted Critical
Publication of GB2112235B publication Critical patent/GB2112235B/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
    • G11B20/14—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
    • 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)
GB08219492A 1981-12-02 1982-07-06 Improved floppy disk data separator Expired GB2112235B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32716281A 1981-12-02 1981-12-02

Publications (2)

Publication Number Publication Date
GB2112235A GB2112235A (en) 1983-07-13
GB2112235B true GB2112235B (en) 1986-01-02

Family

ID=23275427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08219492A Expired GB2112235B (en) 1981-12-02 1982-07-06 Improved floppy disk data separator

Country Status (2)

Country Link
JP (1) JPS5897116A (en)
GB (1) GB2112235B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633488A (en) * 1984-11-13 1986-12-30 Digital Equipment Corporation Phase-locked loop for MFM data recording
US4808884A (en) * 1985-12-02 1989-02-28 Western Digital Corporation High order digital phase-locked loop system
US4845575A (en) * 1987-10-06 1989-07-04 Standard Microsystems Corporation Analog floppy disk data separator
US4796280A (en) * 1987-11-06 1989-01-03 Standard Microsystems Corporation Digital data separator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114910A (en) * 1975-04-02 1976-10-09 Hitachi Ltd Clock data separator
JPS5430011A (en) * 1977-08-10 1979-03-06 Hitachi Ltd Phase synchronous oscillator of digital type
JPS54151014A (en) * 1978-05-19 1979-11-27 Oki Electric Ind Co Ltd Demodulating system
JPS5687213A (en) * 1979-12-18 1981-07-15 Fujitsu Ltd Data demodulating circuit

Also Published As

Publication number Publication date
GB2112235A (en) 1983-07-13
JPS5897116A (en) 1983-06-09

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20020705