Method and device for suppressing variation of DC level of...

Details Method and device for suppressing variation of DC level of... Method and device for suppressing variation of DC level of...

2005-05-02

2008-12-09

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S557000, C369S053130

Reexamination Certificate

active

07463084

ABSTRACT:
The present invention provides a filtering device for high-pass filtering a signal reproduced from an optical data storage medium and a method for the same. More particularly, the present invention provides a device for suppressing the variation of DC level of a quad sum signal or a push-pull signal. The filtering device is adapted to have a higher cutoff frequency for speedily reacting to suppress the DC level change, especially when the pickup head is crossing from the data field to the header field.

REFERENCES:
patent: 4797668 (1989-01-01), Zimmer
patent: 5287177 (1994-02-01), Kim
patent: 6097777 (2000-08-01), Tateishi et al.
patent: 6594303 (2003-07-01), Agrawal et al.

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