Data readers
US6975470B2 · kind B2 · utility
1Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2001 |
| Grant date | Dec 13, 2005 |
| Priority date | — |
| Expiry date | Jul 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/913
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data reader derives a signal on reading a data holding medium. The data reader has processing circuitry to process the signal. The processing circuitry includes a filter having a variable cut-off frequency, a velocity signal generator that produces a signal corresponding to the velocity of the data holding medium, and a processor. The reads the velocity signal and sets the filter cut-off frequency. Calibration data derived during a calibration operation of only the particular data reader determines the filter cut-off frequency for different speeds of the medium during normal read operations of the medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.