Patent ID: 6292816
Filing Date: 2001-09-18
Classification: G11B,H03H

Abstract:
A nonlinear equalizing apparatus for detecting original data a.sub.k from an input value r.sub.k obtained by reproducing data received through a transfer channel or recorded on a storing apparatus, comprising:a linear filter for linear filtering the input value r.sub.k ;a pattern dependent filter including 2.sup..tau.+v tap values selected by the respective patterns (b.sub.k-n+v:k-n+1,b.sub.k-n-1:k-n-.tau.) of future v and past .tau. bit data transition absolute values and N taps p.sub.n (b.sub.k-n+v:k-n+1,b.sub.k-n-1:k-n-.tau.) for outputting the value obtained by multiplying the selected tap value with the current transition (x.sub.k-n); and(wherein, x.sub.k-n =(a.sub.k-n -a.sub.k-n-1)/2.di-elect cons.{-1, 0, }, b.sub.k-n =.vertline.x.sub.k-n.vertline..di-elect cons.{0, 1}, b.sub.k-n-1:k-n-.tau. =(b.sub.k-n-1 b.sub.k-n-2 . . . b.sub.k-n-.tau.), b.sub.k-n+v:k-n+1 =(b.sub.k-n+v b.sub.k-n+v-1 . . . b.sub.k-n+1), n=0, 1, 2, . . . , N, and N is a predetermined integer not less than 1+v)a detector for obtaining an error value e.sub.k by a subsequent equation, with respect to all combinations of current and future data sequences ##EQU19##(wherein, .function..sub.m is the linear filter) and detecting current data assumed in the combination by which the minimum error square value is generated as the original data a.sub.k.