Patent ID: 7653125
Filing Date: 2010-01-26
Classification: G11B

Abstract:
1. A method for determining tap coefficients of a phase interpolation finite impulse response filter with respect to a digital-signal phase-locked loop processing apparatus including an analog-to-digital converter configured to receive a reproduced signal serving as digital data and to sample the received reproduced signal at a frequency higher than a data rate frequency and a phase-locked loop portion configured to perform phase locking of the reproduced signal by filtering the sampled reproduced signal obtained by the analog-to-digital converter using the phase interpolation finite impulse response filter and to output a data sequence of the phase-locked reproduced signal, the method comprising the step of: providing an adaptive equalization finite impulse response filter operating at the data rate frequency at a stage subsequent to the phase-locked loop portion and determining the tap coefficients of the phase interpolation finite impulse response filter using, as estimated values, finite impulse response filter tap coefficients of the adaptive equalization finite impulse response filter, which are converged so as to achieve a minimum mean square error.