Patent ID: 6154867
Filing Date: 2000-11-28
Classification: H03M

Abstract:
A data-reproducing device, comprising:a subtraction absolute value circuit for calculating a subtraction absolute value from pre-equalized reproduce data and estimate data output from a RAM circuit, and for outputting said subtraction absolute value as branchmetrics;a comparison and selection circuit for comparing addition values of said branchmetrics and previously calculated pathmetrics, selecting a smaller one of said values as a result of comparison, and outputting said smaller one of said values as new pathmetric as well as a section signal as to which of said values is selected;a path memory circuit for storing said selection signal, obtaining the most probable path by unifying paths, and outputting the most probable data according to said most probable path;a RAM circuit for outputting estimate data judged to be closest to said pre-equalized reproduce data by using a present output of said path memory circuit as an address; anda data correction circuit for renewing an internal data of said RAM circuit based upon a data obtained by using, as an address, said pre-equalized reproduce data delayed by a predetermined value and continuous data output from said path memory circuit.