Patent ID: 7715295

Claim:
An optical disc reproducing apparatus for correcting asymmetric errors in data reproduced from optical discs, comprising: an asymmetry compensator which detects sampling signals from received digital signals, the sampling signals being determined when a change in polarity occurs in the digital signals, the digital signals being sampled a predetermined number of times in a sampling region every half cycle of an analog signal, wherein the predetermined number of times is at least one; and wherein the asymmetry compensator calculates asymmetric error values from the sampling signals, counts the error values, and corrects a level of the digital signals based on the counted asymmetric error values; a binary module which includes a Viterbi decoder that detects binary data from the digital signals, a slicer which determines the binary data depending on a predetermined threshold value, and a minimum T compensator which corrects the digital signal with a minimum signal having a unit cycle; an equalizer which equalizes a specific frequency of the digital signal; and an adaptive level error detector which detects a base level of the Viterbi decoder from both an input signal into the equalizer and an output signal from the Viterbi decoder, and computes a filtering coefficient of the equalizer from the base level.