Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-11-14
2006-11-14
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S047270, C369S047260
Reexamination Certificate
active
07136340
ABSTRACT:
A disk type record playback device having a wobble signal extracting bandpass filter for controlling a filter's center frequency according to a frequency follow-up control loop including a dummy filter identical in configuration to a filter to be controlled, and a phase comparator is capable of controlling the center frequency of the bandpass filter with satisfactory accuracy. A frequency variable lowpass filter is provided in a preceding stage of the phase comparator constituting a frequency follow-up circuit and supplies a signal obtained by eliminating harmonic components from a frequency follow-up clock signal to the phase comparator. A cutoff frequency of the lowpass filter is changed in cooperation with a center frequency of the bandpass filter, based on a signal outputted from the frequency follow-up control loop.
REFERENCES:
patent: 6246649 (2001-06-01), Ohta et al.
patent: 6987719 (2006-01-01), Mashimo
patent: 7057985 (2006-06-01), Kobayashi et al.
patent: 2005/0073922 (2005-04-01), Mahr et al.
patent: 2000-231726 (1999-02-01), None
patent: 11-203681 (1999-07-01), None
Fujita Satoshi
Ide Hiroshi
A. Marquez, Esq. Juan Carlos
Akita Electronics Systems Co., Ltd.
Fisher Esq. Stanley P.
Lamb Christopher
Reed Smith LLP
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