Method and apparatus for detecting wobble defects in optical recording system
AssigneeMarvell International Ltd.
InventorsMats Oberg, Joseph P. Tatman
Life of this patent
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Abstract
Aspects of the disclosure provide an apparatus. The apparatus includes a pick-up unit, such as an optical pick-up unit, a wobble channel and a defect detector. The pick-up unit generates a push-pull signal corresponding to a wobbled track of a storage medium. The wobble channel includes circuits to receive the push-pull signal, obtain a wobble signal from the push-pull signal, and calculate a wobble amplitude metric based on the wobble signal. The defect detector compares the wobble amplitude metric to a threshold to detect wobble defects.
Claims20
An apparatus, comprising:
- a wobble channel configured to receive a first signal corresponding to a wobbled track of a storage medium;
- a demodulator that is configured to demodulate a second signal from the first signal to calculate a wobble amplitude metric;
- and
- a detector configured to compare the wobble amplitude metric to a threshold to detect wobble defects.
A method of detecting wobble defects, comprising:
- generating a signal in response to a wobbled track of a storage medium;
- demodulating the signal to calculate a wobble amplitude metric;
- comparing the wobble amplitude metric to a threshold;
- and
- detecting wobble defects based on the comparison.
An integrated circuit (IC), comprising:
- a wobble channel configured to receive a first signal, and to obtain a second signal from the first signal, the wobble channel including a demodulator that is configured to demodulate the second signal to calculate a wobble amplitude metric;
- and
- a detector configured to compare the wobble amplitude metric to a threshold to detect wobble defects.
Dependencies are inferred from the claim text.