Noise filtering devices, systems and methods for capacitance sensing devices
US9841840B2 · kind B2 · utility
1Cited by
11References
20Claims
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Key dates
| Filing date | Sep 8, 2015 |
| Grant date | Dec 12, 2017 |
| Priority date | — |
| Expiry date | Nov 27, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0475
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A capacitance sensing system can filter noise that presents in a subset of electrodes in the proximity of a sense object (i.e., finger). A capacitance sensing system can include a sense network comprising a plurality of electrodes for generating sense values; a noise listening circuit configured to detect noise on a plurality of the electrodes; and a filtering circuit that enables a filtering for localized noise events when detected noise values are above one level, and disables the filtering for localized noise events when detected noise values are below the one level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.