Patent ID: 7773481
Filing Date: 2010-08-10
Classification: G11B

Abstract:
1. An optical disc apparatus for writing and/or reading information on an optical disc medium by irradiating said optical disc medium with a laser pulse, comprising: means for obtaining a read signal by reading data recorded on said optical disc medium; an Analog-to-Digital (A/D) converter for generating a read signal bit stream by converting said read signal into a digital data sequence; a Finite Impulse Response (FIR) filter for digitally equalizing said read signal bit stream to obtain an equalized read signal bit stream; a Viterbi decoder for outputting a binarized data signal by using said equalized read signal bit stream; means for extracting positional information of an edge of said read signal bit stream by performing linear interpolation or polynomial interpolation, based on at least two points including a point corresponding to said edge of said read signal bit stream; and adjusting means for adjusting conditions of said laser pulse for writing information, based on said positional information of said edge of said read signal bit stream.