Patent ID: 7672071
Filing Date: 2010-03-02
Classification: G11B

Abstract:
1. A servo field preamble detector for use in a disk drive, the servo field preamble detector comprising: an upsampling module that generates a plurality of upsampled read samples by upsampling a discrete-time read signal by an upsampling factor; an interpolation filter module, operably coupled to the upsampling module, that generates a plurality of interpolated read samples from the plurality of up sampled read samples; a peak detection module, operably coupled to the interpolation filter, that identifies a plurality of peak samples from the plurality of interpolated read samples; a magnitude estimation module, operably coupled to the peak detection module, that convolves the plurality of peak samples by a sequence of alternating polarities to form a plurality of peak magnitude signals and that generates a magnitude estimation signal based on the sum of n successive peak magnitude signals; and a comparison module, operably coupled to the magnitude estimation module, that compares the magnitude estimation signal to a magnitude threshold and that generates a servo preamble detection signal when the magnitude estimation signal compares favorably to the magnitude threshold.