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Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs

A technology for recording speed, optical disk, applied in the field of optical storage system

Inactive Publication Date: 2011-05-18
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this information may not always be available for large numbers of high-speed recordable discs

Method used

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  • Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs
  • Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs
  • Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs

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Embodiment Construction

[0019] figure 2 A simplified side view of a standard disc is shown. The disc inner test area 20 and the disc outer test area 40 represent the innermost and outermost areas of the disc, respectively. Only these test areas can be used by the drive for disc testing and OPC algorithms. The data area 30 constitutes a recordable area in which information is recorded with an irreversible effect.

[0020] According to an exemplary embodiment of the present invention for example writing in a CAV mode of 16X, a single signal test recording is performed in the disc inner test area 20 of the optical disc at a predetermined recording speed (eg 6.3x in this embodiment), And four additional signal test recordings are performed in the disc outer test area 40 of the optical disc at predetermined recording speeds (for example, 6.3x, 8x, 12x, and 16x in the present embodiment).

[0021] These 5 test records are preferably expressed in terms of a beta target value 50 (i.e., power) obtained by ...

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Abstract

A method is disclosed for performing Beta prediction for high-speed writing on unknown recordable optical discs. Test recordings are performed in the inner (20) and outer test (40) zones of an unknown recordable optical disc, yielding results expressed as measured beta target values. At least one beta target value is computed in a data zone (30) of the unknown recordable optical disc. Beta (power) is predicted as a function of speed for continuous angular velocity (CAV) speed profiles, or equivalently, as a function of disc radius for CAV writing, for high speed writing on said unknown optical disc by constructing a piecewise linear interpolation of beta versus speed or disc radius using the measured target values and the at least one calculated beta target value.

Description

field of invention [0001] The present invention relates generally to optical storage systems, and more particularly to a method and apparatus for predicting β (power) as a continuous angular velocity (CAV) for high-speed writing on an unknown recordable optical disc as a function of the velocity of the velocity profile, or equivalently as a function of the disc radius for CAV writing. Background technique [0002] Data storage on optical media has been a rapidly developing technology, limited in part by the ability to precisely write waveform information to the media at high speeds. In order to maximize the amount of data that can be stored on optical media, the pulses generated by the laser must be formed with precisely selected laser power and positional information. [0003] The correct amount of laser power required for optical media recording is variable and dependent on the individual recorder, the medium, and sometimes even the specific location on the medium. Furth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/125G11B7/007
CPCG11B7/0079G11B7/1267G11B7/0045G11B7/126
Inventor T·P·范恩德特
Owner KONINK PHILIPS ELECTRONICS NV