Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-02-11
2008-03-04
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053320, C369S053150, C369S047180, C369S053240
Reexamination Certificate
active
07339867
ABSTRACT:
An optical disk reproducing device has a defect-signal generating circuit including a peak-holding-signal generating circuit for generating a peak-hold signal based on an RF signal read from a recording medium, an intermediate-signal generating circuit for generating an intermediate signal based on the peak-hold signal, a signal-level adjusting circuit for generating a threshold signal based on the intermediate signal, a threshold-signal adjusting circuit for adjusting the level of the threshold signal, and a comparator for generating a defect signal based on the peak-hold signal and threshold signal. The threshold-signal adjusting circuit includes at least one of: a first adjusting circuit for raising the threshold signal in the event the peak-hold signal falls below the threshold signal due to the peak-hold signal and the threshold signal being reversed; and a second adjusting circuit for lowering the threshold signal in the event the peak-hold signal exceeds the threshold signal, due to the reversal.
REFERENCES:
patent: 6236032 (2001-05-01), Kamiyama
patent: 10021547 (1998-01-01), None
patent: 10040546 (1998-02-01), None
patent: 2000-090446 (2000-03-01), None
Ando Ryo
Yamaguchi Takeshi
Depke Robert J.
Korzuch William
Ortiz-Criado Jorge L.
Rockey, Depke & Lyons LLC.
Sony Corporation
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