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US 8,755,257 B2Granted
Method and apparatus for detecting land pre-pits
AssigneeMarvell World Trade Ltd.
InventorsMats Oberg, Jingfeng Liu
Life of this patent
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Abstract
Aspects of the disclosure provide a method for detecting land pre-pits. The method includes detecting, based on a land pre-pit threshold, a land pre-pit data stream from a signal responsive to land pre-pits on an optical medium, comparing a characteristic of the detected land pre-pit data stream in a specific number of wobble periods with a pre-determined land pre-pit characteristic in the specific number of wobble periods, and adjusting the land pre-pit threshold based on the comparison.
Claims20
A method, comprising:
- detecting, based on a land pre-pit threshold, a land pre-pit data stream from a signal responsive to land pre-pits on an optical medium;
- comparing a pattern of the detected land pre-pit data stream in a specific number of wobble periods with pre-known patterns in the specific number of wobble periods;
- and
- adjusting the land pre-pit threshold based on the comparison.
1 more element
An apparatus, comprising:
- a detector configured to detect, based on a land pre-pit threshold, land pre-pit data stream from a signal responsive to land pre-pits on an optical medium;
- and
- a controller configured to compare a pattern of the detected land pre-pit data stream in a specific number of wobble periods with pre-known patterns in the specific number of wobble periods, and adjust the land pre-pit threshold based on the comparison.
An optical drive, comprising:
- an optical pickup unit configured to generate a signal in response to a track on an optical medium;
- a detector configured to detect, based on a land pre-pit threshold, land pre-pit data stream from the signal;
- and
- a controller configured to compare a pattern of the detected land pre-pit data stream in a specific number of wobble periods with pre-known patterns in the specific number of wobble periods, and adjust the land pre-pit threshold based on the comparison.
1 more element
Dependencies are inferred from the claim text.