Patent ID: 6747936
Filing Date: 2004-06-08
Classification: G11B,H03H,H04L

Abstract:
A data reproduction apparatus, for detecting data based on partial response maximum likelihood (PRML), the apparatus comprising:a data detector which detects data based on partial response maximum likelihood (PRML); an equalizer comprising a digital filter; a level error detector which extracts a level of an output value of the equalizer based on a reference level set in the data detector, and which detects a level error between the level of the output value and predetermines at least one reference value corresponding to zero level, positive and negative middle levels, and positive and negative maximum levels, which are classified depending on the partial response (PR) type of the data detector, and detects the levels from the output value of the equalizer, and outputs the level error corresponding to differences between the detected levels and corresponding reference values; a coefficient bank which stores a plurality of filter coefficients of the equalizer; and a coefficient selector which selects at least one of the plurality of the filter coefficients of the equalizer from the coefficient bank such that the level error is minimized.