Patent ID: 8089845
Filing Date: 2012-01-03
Classification: G11B

Abstract:
1. An offset compensator comprising: a means for performing time discretization of a read signal to a digitized read signal; a means for subtracting an offset compensation signal from the digitized read signal to create an output signal; a first offset detection means for detecting an offset of the output signal; a second offset detection means for detecting the offset of the output signal with a different method from the first offset detection means; a means for smoothing the offset, detected by the first offset detection means, in a time region to create the offset compensation signal; and a determination means for determining a possibility of a generation of a pseudo-lock, by using the offset compensation signal and an output from the second offset detection means, wherein the determination means performs any one of setting the offset compensation signal to zero and inverting a value of the offset compensation signal when determining that there is a possibility of the generation of the pseudo-lock.