Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-10-26
2009-12-29
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
Reexamination Certificate
active
07639579
ABSTRACT:
A white dot out detecting device according to the present invention comprises a recording/reproduction control signal generator for generating a recording/reproduction control signal showing a recording state or a reproducing state of an optical disk, a variable gain amplifier for amplifying and outputting an information signal read from the optical disk and adjusting a gain in the amplification based on the recording/reproduction control signal, an envelope detector for detecting an output envelope of the variable gain amplifier, an integrator for integrating an output of the envelope detector, a slice level setting unit for setting a slice level as a reference for detecting a white dot out based on an output of the integrator, a comparator for detecting the white dot out based on comparison of the output of the envelope detector and the slice level to each other, and a level shifter for temporarily shifting the slice level to a high-level side when a change of the recording/reproduction control signal is detected.
REFERENCES:
patent: 7215631 (2007-05-01), Horibe et al.
patent: 7230897 (2007-06-01), Izumi
patent: 7362674 (2008-04-01), Torii et al.
patent: 2003-196853 (2003-07-01), None
patent: WO 2004061845 (2004-07-01), None
Sakakibara Takatomi
Torii Toshihiro
Feild Joseph H
Haley Joseph
McDermott Will & Emery LLP
Panasonic Corporation
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