Patent ID: 9442610
Filing Date: 2016-09-13
CPC Classification: G06F,H03K

Claim Text:
1. A method of detecting one or more touch events on a touch sensitive device comprising: measuring a capacitance of each channel of a plurality of channels when no touch event is present on any of the plurality of channels for determining a no touch baseline value for each channel; selecting one of the plurality of channels as a primary channel; selecting another of the plurality of channels as a reference channel, wherein the reference channel is different than the primary channel; measuring a capacitance of the primary channel; measuring a capacitance of the reference channel; calculating a difference between the measured capacitance of the primary channel and the measured capacitance of the reference channel for determining a measured difference; calculating a difference between the no touch baseline value for the primary channel and the no touch baseline value for the reference channel for determining a baseline difference; calculating a difference between the measured difference and the baseline difference for determining a delta from baseline for the primary channel and reference channel pair; repeating the steps of selecting one of the plurality of channels as a primary channel, selecting another of the plurality of channels as a reference channel, measuring a capacitance of the primary channel, measuring a capacitance of the reference channel, calculating a difference between the measured capacitance of the primary channel and the measured capacitance of the reference channel, calculating a difference between the no touch baseline value for the primary channel and the no touch baseline value for the reference channel, and calculating a difference between the measured difference and the baseline difference for determining a delta from baseline for the primary channel and reference channel pair for each channel in the plurality of channels so that each channel is selected as the primary channel; and determining one or more touch events from the delta from baselines calculated for all primary channel and reference channel pairs.