GB2148670B - A high density code for coded recording of data and recording and reading apparatus therefor - Google Patents

A high density code for coded recording of data and recording and reading apparatus therefor

Info

Publication number
GB2148670B
GB2148670B GB08423669A GB8423669A GB2148670B GB 2148670 B GB2148670 B GB 2148670B GB 08423669 A GB08423669 A GB 08423669A GB 8423669 A GB8423669 A GB 8423669A GB 2148670 B GB2148670 B GB 2148670B
Authority
GB
United Kingdom
Prior art keywords
recording
data
high density
reading apparatus
apparatus therefor
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
GB08423669A
Other versions
GB2148670A (en
GB8423669D0 (en
Inventor
Christiaan Steenbergen
Johannes Jacobus Verboom
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.)
Optical Storage International - U S
Optical Storage International US
Original Assignee
Optical Storage International - U S
Optical Storage International US
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 Optical Storage International - U S, Optical Storage International US filed Critical Optical Storage International - U S
Publication of GB8423669D0 publication Critical patent/GB8423669D0/en
Publication of GB2148670A publication Critical patent/GB2148670A/en
Application granted granted Critical
Publication of GB2148670B publication Critical patent/GB2148670B/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085Pits
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/14Digital recording or reproducing using self-clocking codes
    • G11B20/1403Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407Digital 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
    • G11B20/1419Digital 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
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/14Digital recording or reproducing using self-clocking codes
    • G11B20/1403Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/013Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track for discrete information, i.e. where each information unit is stored in a distinct discrete location, e.g. digital information formats within a data block or sector

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
GB08423669A 1983-10-13 1984-09-19 A high density code for coded recording of data and recording and reading apparatus therefor Expired GB2148670B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US54175383A 1983-10-13 1983-10-13

Publications (3)

Publication Number Publication Date
GB8423669D0 GB8423669D0 (en) 1984-10-24
GB2148670A GB2148670A (en) 1985-05-30
GB2148670B true GB2148670B (en) 1987-07-08

Family

ID=24160893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08423669A Expired GB2148670B (en) 1983-10-13 1984-09-19 A high density code for coded recording of data and recording and reading apparatus therefor

Country Status (7)

Country Link
JP (1) JPH0721941B2 (en)
AU (1) AU574722B2 (en)
CA (1) CA1229164A (en)
DE (1) DE3416547C2 (en)
FR (1) FR2557344B1 (en)
GB (1) GB2148670B (en)
NL (1) NL8403044A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60231980A (en) * 1983-12-29 1985-11-18 レーザー マグネテイツク ストーリツジ インターナシヨナル コンパニー High-density code for optical recording
US4881076A (en) * 1987-12-01 1989-11-14 International Business Machines Corporation Encoding for pit-per-transition optical data recording
JPH06325369A (en) * 1993-03-08 1994-11-25 Philips Electron Nv Combined optical recording and reading device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1122711A (en) * 1976-07-14 1982-04-27 Sperry Rand Corporation Method and apparatus for encoding and recovering binary digital data
JPS55141852A (en) * 1979-04-24 1980-11-06 Sony Corp Data converting system
NL8006165A (en) * 1980-11-12 1982-06-01 Philips Nv SYSTEM FOR TRANSFER OF DIGITAL INFORMATION, CODER FOR APPLICATION IN THAT SYSTEM, DECODER FOR APPLICATION IN THAT SYSTEM AND RECORD CARRIAGE FOR APPLICATION IN THAT SYSTEM.
US4377805A (en) * 1981-04-20 1983-03-22 Emi Limited Magnetic recording
FR2507035B1 (en) * 1981-06-02 1988-09-16 Thomson Csf BINARY DATA CODING METHOD AND DIGITAL VIDEO SIGNAL TRANSMISSION DEVICE IMPLEMENTING SUCH A METHOD
JPS5846751A (en) * 1981-09-11 1983-03-18 Sony Corp Binary code modulating method and recording medium and its reproducer

Also Published As

Publication number Publication date
DE3416547A1 (en) 1986-01-09
FR2557344B1 (en) 1989-01-06
JPS6083225A (en) 1985-05-11
GB2148670A (en) 1985-05-30
AU3378984A (en) 1985-04-18
AU574722B2 (en) 1988-07-14
CA1229164A (en) 1987-11-10
FR2557344A1 (en) 1985-06-28
GB8423669D0 (en) 1984-10-24
DE3416547C2 (en) 1994-10-06
NL8403044A (en) 1985-05-01
JPH0721941B2 (en) 1995-03-08

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960919