Patent ID: 8339909
Filing Date: 2012-12-25
Classification: G11B

Abstract:
1. An optical disc device comprising: an optical head apparatus that detects a first signal detected from a central part of a returning light beam from a super-resolution optical disc and a second signal detected from a peripheral part of the returning light beam, the peripheral part being peripheral in a direction corresponding to a track direction on the super-resolution optical disc; and a signal processing unit configured to generate a reproduced signal by operating on the first signal and the second signal in combination or separately; wherein the signal processing unit comprises: a gain adjustment unit configured to adjust an amplitude of the first signal; a subtraction unit configured to generate a third signal by subtracting, from the second signal, the first signal with the amplitude adjusted by the gain adjustment unit; and a delay unit configured to generate a fourth signal by correcting a delay between the third signal and the first signal; and wherein the signal processing unit generates the reproduced signal by combining the first signal with the fourth signal output from the delay unit.