FR2144755A1 - - Google Patents

Info

Publication number
FR2144755A1
FR2144755A1 FR7224098A FR7224098A FR2144755A1 FR 2144755 A1 FR2144755 A1 FR 2144755A1 FR 7224098 A FR7224098 A FR 7224098A FR 7224098 A FR7224098 A FR 7224098A FR 2144755 A1 FR2144755 A1 FR 2144755A1
Authority
FR
France
Prior art keywords
information
reference signal
light beam
signals
information bits
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.)
Withdrawn
Application number
FR7224098A
Other languages
English (en)
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
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 Honeywell Inc filed Critical Honeywell Inc
Publication of FR2144755A1 publication Critical patent/FR2144755A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10595—Control of operating function
    • 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
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2525—Magneto-optical [MO] discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
FR7224098A 1971-07-06 1972-07-04 Withdrawn FR2144755A1 (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15989671A 1971-07-06 1971-07-06

Publications (1)

Publication Number Publication Date
FR2144755A1 true FR2144755A1 (enExample) 1973-02-16

Family

ID=22574564

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7224098A Withdrawn FR2144755A1 (enExample) 1971-07-06 1972-07-04

Country Status (3)

Country Link
US (1) US3720923A (enExample)
FR (1) FR2144755A1 (enExample)
IT (1) IT959894B (enExample)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891794A (en) * 1966-09-01 1975-06-24 Battelle Development Corp Method and apparatus for synchronizing photographic records of digital information
US3986022A (en) * 1973-06-04 1976-10-12 Gilbert Peter Hyatt Illumination control system
US5432526A (en) * 1970-12-28 1995-07-11 Hyatt; Gilbert P. Liquid crystal display having conductive cooling
US4471385A (en) * 1970-12-28 1984-09-11 Hyatt Gilbert P Electro-optical illumination control system
US4672457A (en) * 1970-12-28 1987-06-09 Hyatt Gilbert P Scanner system
US4739396C1 (en) * 1970-12-28 2002-07-09 Gilbert P Hyatt Projection display system
US5398041A (en) * 1970-12-28 1995-03-14 Hyatt; Gilbert P. Colored liquid crystal display having cooling
JPS5334865B2 (enExample) * 1972-11-17 1978-09-22
US4342906A (en) * 1973-06-04 1982-08-03 Hyatt Gilbert P Pulse width modulated feedback arrangement for illumination control
US4084153A (en) * 1976-03-15 1978-04-11 Harris Corporation Apparatus for reconstructing a binary bit pattern
FR2576130B1 (fr) * 1985-01-15 1989-07-13 Thomson Csf Memoire numerique a film photographique couleur, et dispositif de lecture optique correspondant
JPS62146471A (ja) * 1985-12-20 1987-06-30 Matsushita Electric Ind Co Ltd 光学的情報記録再生装置
US4889979A (en) * 1986-08-15 1989-12-26 Drexler Technology Corporation Method for extending life of optically recorded information
JPH03171453A (ja) * 1989-11-29 1991-07-24 Sony Corp 光磁気信号再生方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3072889A (en) * 1955-04-20 1963-01-08 Fairchild Camera Instr Co Densitometric data handling system
US3188907A (en) * 1962-11-27 1965-06-15 Ibm Opto-electrical scanning system for gray level detection
US3629517A (en) * 1969-09-29 1971-12-21 Ibm Method and apparatus for magneto-optical reading of superimposed magnetic recordings
US3614189A (en) * 1970-04-23 1971-10-19 Rca Corp Holographic memory with illumination hologram providing reference and object beams

Also Published As

Publication number Publication date
US3720923A (en) 1973-03-13
IT959894B (it) 1973-11-10

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Legal Events

Date Code Title Description
ST Notification of lapse