IT959894B - Memoria ottica a lettura differenziale - Google Patents
Memoria ottica a lettura differenzialeInfo
- Publication number
- IT959894B IT959894B IT26044/72A IT2604472A IT959894B IT 959894 B IT959894 B IT 959894B IT 26044/72 A IT26044/72 A IT 26044/72A IT 2604472 A IT2604472 A IT 2604472A IT 959894 B IT959894 B IT 959894B
- Authority
- IT
- Italy
- Prior art keywords
- information
- reference signal
- light beam
- signals
- information bits
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title abstract 4
- 230000006870 function Effects 0.000 abstract 2
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)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15989671A | 1971-07-06 | 1971-07-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
IT959894B true IT959894B (it) | 1973-11-10 |
Family
ID=22574564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT26044/72A IT959894B (it) | 1971-07-06 | 1972-06-22 | Memoria ottica a lettura differenziale |
Country Status (3)
Country | Link |
---|---|
US (1) | US3720923A (it) |
FR (1) | FR2144755A1 (it) |
IT (1) | IT959894B (it) |
Families Citing this family (14)
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 |
US5398041A (en) * | 1970-12-28 | 1995-03-14 | Hyatt; Gilbert P. | Colored liquid crystal display having cooling |
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 |
JPS5334865B2 (it) * | 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)
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 |
-
1971
- 1971-07-06 US US00159896A patent/US3720923A/en not_active Expired - Lifetime
-
1972
- 1972-06-22 IT IT26044/72A patent/IT959894B/it active
- 1972-07-04 FR FR7224098A patent/FR2144755A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US3720923A (en) | 1973-03-13 |
FR2144755A1 (it) | 1973-02-16 |
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