Automatic filter-reset mechanism
US8422609B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2009 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Feb 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0294
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a (hard-drive) read channel has a (DFIR equalization) filter, whose tap coefficients are adaptively updated. A reset controller monitors an (LLR) signal generated downstream of the filter to automatically determine when to reset the filter, e.g., by reloading an initial set of user-specified tap coefficients. For LLR values, the reset controller determines to reset the filter when the reset controller detects that too many recent LLR values have confidence values that are too low. When implemented in a hard-drive read channel, the reset controller can reset the filter one or more times during read operations within a sector of the hard drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.