Patent ID: 6937551
Filing Date: 2005-08-30
Classification: G11B

Abstract:
1. A PRML detector including a waveform equalizer that equalizes a waveform of a reproduction signal obtained by reproducing marks and non-marks recorded on a recording medium, and a decoder that generates binary-coded data of the reproduction signal based on the waveform equalized by the waveform equalizer, said decoder outputting a temporary data string which is obtained before the binary-coded data is obtained, said waveform equalizer comprising: an equalizer that includes a delay element that delays a propagation of the reproduction signal, a plurality of multipliers that multiply predetermined coefficients by the reproduction signal and the delayed signal from the delay element, and an adder that adds outputs from the plurality of multipliers; a target value judger that determines a target value for equalizing based on the temporary data string output from the decoder; and a coefficient adaptive controller that calculates the predetermined coefficients and adaptively updates the calculated predetermined coefficients for each of a plurality of multipliers, wherein the coefficient adaptive controller stops updating the calculated predetermined coefficients in response to a merge check signal.