Patent ID: 8027233
Filing Date: 2011-09-27
Classification: G11B

Abstract:
1. An optical disk device that reproduces reproduction information recorded in a groove of an optical disk compliant with DVD-R/RW standards, comprising: an RF signal generation unit that reads information from the groove and generates an RF signal; an LPP detection unit that detects a land prepit (LPP) from a wobble signal; a difference calculation unit that obtains a difference set, assuming that a sync pattern portion obtained when the LPP detection unit detects the LPP is an LPP-present sync pattern portion and that a sync pattern portion obtained when the LPP detection unit detects no LPP is a non-LPP sync pattern portion, at a timing when the sync pattern portion is positioned at the head of a sync frame of the RF signal, by performing processing of calculating a difference in signal level between the LPP-present sync pattern portion and the non-LPP sync pattern portion having the same polarity; and a correction execution unit that executes correction on the RF signal at the timing when the LPP detection unit detects the LPP, by using a calculation result of the difference calculation unit.