Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-05-08
2007-05-08
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S044290, C369S044350, C369S124050
Reexamination Certificate
active
10479275
ABSTRACT:
An optical disc system comprises a gain offset unit for giving a gain and an offset to an inputted reproduction signal, an A/D converter, a peak detector, a bottom detector, an amplitude detector for calculating a signal, an offset detector for calculating a signal offset, a dropout detector for detecting a dropout in the input signal, and a controller for performing gain control and offset control of the gain offset unit, the controller being able to hold the control operation or switch the control speed by a hold signal that is supplied from the outside, wherein a defect in a recording medium is detected to hold the gain control and offset control or change the control response speed, whereby the signal amplitude and offset at the input of the A/D converter are always kept constant.
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Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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