Wobble signal reproducing device and method

Details Wobble signal reproducing device and method Wobble signal reproducing device and method

2005-01-18

2008-03-25

Korzuch, William (Department: 2627)

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Control of information signal processing channel

C369S044130, C369S053340

Reexamination Certificate

active

07349305

ABSTRACT:
A wobble signal reproducing device and method. The wobble signal reproducing device may include a computation unit for outputting a push-pull signal by use of a signal picked up by wobbling an optical disc; a wobble band pass filter (BPF) unit for applying band pass filtering to the push-pull signal based on a first control signal, applying low pass filtering to the band pass filtering-applied signal based on a second control signal, and outputting a wobble signal; a wobble phase locked loop (PLL) unit for generating a channel clock signal based on the wobble signal, wherein the first and second control signals correspond to the channel clock signal, the wobble BPF unit applies the band pass filtering at a center frequency varying based on the first control signal, and applies the low pass filtering at a cutoff frequency varying based on the second control signal. Accordingly, the wobble signal reproducing device and method can effectively reproduce a wobble signal in the CLV mode as well as in the CAV mode in which the spindle motor rotates at a constant speed.

REFERENCES:
patent: 5825733 (1998-10-01), Ogawa
patent: 5852599 (1998-12-01), Fuji
patent: 6246649 (2001-06-01), Ohta et al.
patent: 2001/0026512 (2001-10-01), Nishimura et al.
patent: 2006/0044962 (2006-03-01), Ishibashi et al.
patent: 11-161961 (1999-06-01), None
Japanese Patent Office Action, mailed Mar. 6, 2007 and issued in corresponding Japanese Patent Application No. 2005-011448.

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