Readback signal-based head-disc contact detection using AM/FM demodulation
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United States of America Patent
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Feb 15, 2011
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app pub date -
Jan 14, 2009
filing date -
Jan 14, 2009
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Abstract
A method includes: producing a readback signal using a recording head positioned adjacent to a recording medium, amplitude demodulating the readback signal to produce an amplitude demodulated signal, frequency demodulating the readback signal to produce a frequency demodulated signal, and using the amplitude demodulated signal and the frequency demodulated signal to determine contact of the recording head with the recording medium. An apparatus that can be used to implement the method is also provided.
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