Tracking error detection apparatus

Details Tracking error detection apparatus Tracking error detection apparatus

2007-07-03

2007-07-03

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044290, C369S044340

Reexamination Certificate

active

10809486

ABSTRACT:
A tracking error detection apparatus comprises a phase difference detection circuit for receiving two sequences of digital signals, and performing phase comparison using a distance between zerocross points of the two sequences of digital signals to output a result of phase comparison, and an LPF for generating a tracking error signal from the result of phase comparison. The phase difference detection circuit does not carry out phase composition in a position that is not appropriate as a target position to perform phase comparison, and outputs the result of phase comparison as a pulse signal corresponding to one sampling clock. Therefore, even when a disc is played at CAV or a flaw or the like exists on the disc, an accurate tracking error signal can be detected.

REFERENCES:
patent: 7012862 (2006-03-01), Hiratsuka
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patent: 2001-67690 (2001-03-01), None
patent: 2001-243643 (2001-09-01), None
patent: 1999-0052619 (1999-07-01), None

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