Patent ID: 7139231
Filing Date: 2006-11-21
Classification: G11B

Abstract:
1. An information reproducing apparatus for detecting data recorded in a medium by Partial Response and Maximum Likelihood signal processing units and an equalizer, the apparatus comprising: a table which stores plural pairs of a true pattern and a false pattern; a pattern comparator which compares the detected data with the true patterns and the false patterns stored in the table to find a pair of the true pattern and the false pattern one of which pattern coincides with the detected data; and a calculating device which, when the pattern comparator finds the pair, calculates: where C T denotes a probability of occurrence of a true pattern T, H T,F denotes Hamming distance between the true pattern T and a false pattern F, and F(0) denotes a probability of occurrence by mistaken identification from the pattern T to the pattern F and is defined as: