Patent ID: 7391699

Claim:
An information reproducing method that employs a PRML method for comparing a target signal with each reproduced signal for a continuous N time to select the most likelihood one of state changes therein, thereby transforming said reproduced signal to a binary value; wherein, when said PRML method is represented as PR(α 1 , α 2 , . . . , αN), the leftmost M 1 coefficients and the rightmost M 2 coefficients in a coefficient array are all zero coefficients while integer values M 1 and M 2 satisfy a relationship of “M 1 ≧0, M 2 ≧0, M 1 +M 2 ≧1, M 1 +M 2 <N”; and wherein, when integer MM=M 1 +M 2 and integer NN=N−MM are satisfied, said method includes: a step of using a target value obtained by adding 2 N or less compensated values V 2 , stored in a pattern compensation table, corresponding to a value of an N-bit digital bit array to an initial target level V 1 obtained by a convolution operation of each of NN non-zero coefficient values and an NN-bit digital bit array, said pattern compensation table being located in a decode unit; a step of binarizing said reproduced signal to the most likelihood bit array while comparing said reproduced signal with said target value (V 1 +V 2 ); and a step of outputting said binarized reproduced signal to an information reproducing device.