Harmonic sensor
US8154820B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2011 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Jul 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5534
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system comprising: a read/write head configured to generate signals in response to the read/write head being at a particular fly height over a storage medium during a read operation; a weighting function module configured to i) determine time domain samples in response to the signals generated by the read/write head, and ii) multiply each of the time domain samples by a corresponding coefficient of a window function to generate weighted samples; a first harmonic sensor module configured to estimate a magnitude of a first frequency in response to the weighted samples; and a head height control module configured to i) determine an estimated height of the read/write head over the storage medium in response to the magnitude of the first frequency, and ii) selectively adjust, during the read operation, the particular fly height of the read/write head over the storage medium based on the estimated height.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.