Patent ID: 8874396
Filing Date: 2014-10-28
Classification: G06F,H03K

Abstract:
1. A method comprising: performing a listening scan on a sense array to compute an estimate of a noise metric; inducing, by a processing device during the listening scan of the sense array, an injected touch signal, the injected touch signal induced, at the processing device, independent from signals received from the sense array; measuring, by the processing device, a signal, wherein the measured signal comprises the injected touch signal and a second signal originating from the sense array; converting the measured signal into first data; and computing the estimate of the noise metric in the measured signal based on the injected touch signal, wherein computing the estimate of the noise metric comprises comparing the first data and second data corresponding to the injected touch signal, the second data representing expected data that would result from a conductive object proximate to a known location on the sense array during a touch scan of the sense array.