Defect signal detecting apparatus for optical recording/reproducing apparatus and defect signal detecting method thereof

摘要

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 delta of asymmetry by detecting a maximum value I_L^max and a minimum value I_L^min of a signal I_L having a maximum periodicity among the signal input, and a maximum value I_S^max and a minimum value I_S^min of a signal I_S having 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 delta of asymmetry.