Patent ID: 7219296
Filing Date: 2007-05-15
Classification: G11B

Abstract:
1. An information reproducing apparatus for performing maximum-likelihood decoding, comprising: a detecting section which detects information recorded in the recording medium and which outputs a reproduction signal; an equalizing section which performs partial response equalization of the reproduction signal and which outputs an equalized signal; a correcting section which corrects the potential of the equalized signal in accordance with a correction amount determined on the basis of a plurality of reference levels used for the maximum-likelihood decoding, to produce a corrected equalizing signal; and a maximum-likelihood decoding section which performs maximum-likelihood decoding of the corrected equalizing signal by referencing the plurality of reference levels, and which outputs a decoded signal; wherein, the plurality of reference levels used for the maximum-likelihood decoding are represented by LV( wherein the constant α is the same as a value LVd equal to each of the intervals between the plurality of reference levels used for the maximum-likelihood decoding and, based on the correction amount, the correcting section corrects a corresponding equalized signal level.