Patent ID: 7080313
Filing Date: 2006-07-18
Classification: G11B,H03M

Abstract:
1. A signal evaluation apparatus for decoding data sequences by means of a maximum likelihood decoding, comprising: a subtraction means for obtaining a difference of likelihoods of at least one pair of paths of the data sequences; a selection means for selecting from the data sequences at least one pair of paths between which a distance has a minimum value; a calculation means for executing statistical processing of the difference of likelihoods obtained by the subtraction means with regard to the paths selected by the selection means; and a correction means for correcting results of the statistical processing executed by the calculation means on the basis of the number of measurement samples of the paths selected by the selection means and the number of all samples of the data sequence; wherein the correction means comprises: wherein, assuming that the number of measurement samples counted by the first counting means is To and the number of all the samples of the data sequences counted by the second counting means is T,