Noise filtering devices, systems and methods for capacitance sensing devices
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United States of America Patent
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Dec 12, 2017
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Sep 8, 2015
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Feb 7, 2011
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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.
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