Harmonic sensor
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United States of America Patent
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Jul 26, 2011
Grant Date -
N/A
app pub date -
Oct 19, 2009
filing date -
Oct 31, 2008
priority date (Note) -
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Abstract
A fly height control system includes a weighting function module. The weighting function module applies coefficients from a window function in a time domain to digital samples to provide weighted samples. A first of the coefficients is applied to a first of the digital samples and a second of the coefficients is applied to a second of the digital samples. The first of the coefficients has a first magnitude that is different than a second magnitude of the second of the coefficients. The system also includes a harmonic sensor module that estimates a magnitude of a frequency in a frequency domain based on the weighted samples. The system also includes a head height control module that determines a height of a read/write head over a storage medium based on the magnitude of the frequency.
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