Patent ID: 6226139
Filing Date: 2001-05-01
Classification: G11B

Abstract:
A clock generator comprising:clock signal generating means for generating a clock signal;sampling means for sampling a phase comparison target signal which is supplied at predetermined timing intervals and which has a first period, in accordance with said clock signal during every second period shorter than said first period, in order to output N sampled values during said first period, N being a natural number;inner product calculating means for calculating an inner product of a signal vector comprising said N sampled values and a factor vector having N weighting factors, so as to output an outcome of the calculation as a phase comparison signal;phase control means for controlling said clock signal generating means based on said phase comparison signal so that said phase comparison target signal and said clock signal will match in phase;wherein the total sum of said N sampled values is substantially zero; andcontrol means for switching said N weighting factors for said inner product calculating means to different values between a reproduction mode and a recording mode of the disk drive.