Method and device for canceling a land-groove offset...

Details Method and device for canceling a land-groove offset... Method and device for canceling a land-groove offset...

2007-11-27

2007-11-27

Huber, Paul W. (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280

Reexamination Certificate

active

11009360

ABSTRACT:
A device for canceling a land-groove offset component of a focusing error signal in an optical storage system includes first and second circuits, and an adder. The first circuit processes a radio (or wobble) frequency ripple signal to obtain a first processed signal that is multiplied by a first gain value (G1) so as to result in a first signal. The second circuit processes a tracking error signal to obtain a second processed signal that is multiplied by a second gain value (G2) so as to result in a second signal. The adder is coupled to the first and second circuits, and adds the first and second signals to produce a compensative land-groove offset component that is to be fed into a focusing device of the optical storage system so as to enable the focusing device to cancel out the land-groove offset component of the focusing error signal.

REFERENCES:
patent: 4747089 (1988-05-01), Eguchi et al.
patent: 5199011 (1993-03-01), McDonald et al.
patent: 2003/0048706 (2003-03-01), Kobayashi
patent: 2004/0125710 (2004-07-01), Hong et al.

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