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 ImaxL and a minimum value IminL of a signal IL having a maximum periodicity among the signal input, and a maximum value ImaxS and a minimum value IminS of a signal IS 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 δ of asymmetry.
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