Patent ID: 7274645
Filing Date: 2007-09-25
Classification: G11B

Abstract:
1. A reproduction signal processing apparatus comprising: a reproduction unit for reproducing information that is recorded on an optical disc; an A/D converter for converting a reproduction signal that is reproduced by the reproduction unit into a multi-bit digital signal; a phase-locked loop control unit for outputting a reproduction clock that is in phase with clock components included in the reproduction signal, using the multi-bit digital signal; a filter for performing digital equalization to the multi-bit digital signal that is obtained by the A/D converter; and a filter coefficient learning unit for adaptively controlling filter coefficients of the filter in accordance with the digitally equalized signal to minimize an equalization error, wherein said filter coefficient learning unit includes: said equalization error correcting unit including a correcting unit for performing correction when a sign of the equalization target value that is set by the provisional judgment unit and a sign of the output signal from the filter are different from each other.