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US 2002/0176334 A1Published application
Method and system for generating a tracking error signal
AssigneeNEC Corporation
InventorYutaka Yamanaka
Life of this patent
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Abstract
A method for generating a tracking error signal includes the steps of detecting a first signal representing the amount of reflected light, judging presence or absence of a pit on the current track, and averaging the first signal with respect to time while inverting the detected signal obtained during the presence or absence of the pit. An effective tracking error signal can be obtained in the case of a track pitch smaller than a pitch resolution limit.
Claims20
A method for generating a tracking error signal comprising the steps of:
- irradiating an optical spot onto a current track of an optical disk;
- generating a first signal representing an amount of reflected light from said optical disk;
- judging presence or absence of a pit irradiated by said optical spot on said current track;
- and
- averaging said first signal with respect to time while inverting said first signal obtained during either the presence or the absence of the pit.
2 more elements
A tracking error signal generating system comprising:
- an optical unit for irradiating an optical spot onto a current track of an optical disk;
- a photosensor unit for generating a first signal representing an amount of reflected light from said optical disk;
- a judgement section for judging presence or absence of a pit irradiated by said optical spot on said current track;
- and
- a signal processing section for averaging said first signal with respect to time while inverting said first signal obtained during either the presence or the absence of the pit to generate a tracking error signal.
2 more elements
Dependencies are inferred from the claim text.