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
  • 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)
• Optical Recording Or Reproduction (AREA)
• Optical Record Carriers And Manufacture Thereof (AREA)
• Signal Processing For Digital Recording And Reproducing (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=25068187

Family Applications (1)

Country Status (6)

Families Citing this family (10)

Family Cites Families (6)

• 1977
  • 1977-12-16 GB GB52536/77A patent/GB1570799A/en not_active Expired
  • 1977-12-19 CA CA293,421A patent/CA1103351A/en not_active Expired
• 1978
  • 1978-01-13 FR FR7800965A patent/FR2379129A1/fr not_active Withdrawn
  • 1978-01-18 NL NL7800613A patent/NL7800613A/xx not_active Application Discontinuation
  • 1978-01-26 JP JP781978A patent/JPS5395603A/ja active Pending
  • 1978-01-27 DE DE19782803603 patent/DE2803603A1/de not_active Withdrawn

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