Harmonic sensor
US7986487B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2009 |
| Grant date | Jul 26, 2011 |
| Priority date | — |
| Expiry date | Oct 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5534
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.