Readback signal-based head-disc contact detection using AM/FM demodulation
US7889447B2 · kind B2 · utility
1Cited by
21References
19Claims
0Family size
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Key dates
| Filing date | Jan 14, 2009 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Aug 29, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.