Defect signal detecting apparatus for optical...

Details Defect signal detecting apparatus for optical... Defect signal detecting apparatus for optical...

2007-07-24

2007-07-24

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

By medium defect indicative control signal

C369S053150, C369S053340

Reexamination Certificate

active

10680154

ABSTRACT:
A defect signal detecting apparatus for an optical recording/reproducing apparatus that includes a maximum value detecting unit for detecting a highest amplitude among signals input during a maximum value detection period as a maximum value, a minimum value detecting unit for detecting a lowest amplitude among signals input during a minimum value detection period as a minimum value, an asymmetry detecting unit for calculating an amount δ of asymmetry by detecting a maximum value ILmaxand a minimum value ILminof a signal ILhaving a maximum periodicity among the signal input, and a maximum value ISmaxand a minimum value ISminof a signal IShaving a minimum periodicity among the signal input, and a defect determining unit for determining whether there is a defect in the signal input, using the maximum value, the minimum value and the amount δ of asymmetry.

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