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US 7,889,447 B2Granted
Readback signal-based head-disc contact detection using AM/FM demodulation
AssigneeSeagate Technology LLC
InventorsJuil Lee, Michael Ting, Mark David Bedillion
Life of this patent
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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.
Claims19
A method comprising:
- 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.
2 more elements
An apparatus comprising:
- a recording head positioned adjacent to a recording medium and producing a readback signal;
- an amplitude demodulator for amplitude demodulating the readback signal to produce an amplitude demodulated signal;
- a frequency demodulator for frequency demodulating the readback signal to produce a frequency demodulated signal;
- and
- circuitry for using the amplitude demodulated signal and the frequency demodulated signal to determine contact of the recording head with the recording medium.
2 more elements
Dependencies are inferred from the claim text.