Patent ID: 9733745
Date: 2017-08-15
CPC Classifications: G06F

Claim:
1. A method of operating a touch-sense device comprising: computing a function of one or more sensor signals from the touch-sense device; detecting a threshold crossing on the function of the one or more sensor signals, the threshold crossing corresponding to sensing a first capacitance in response to a light press on a surface of the touch-sense device, wherein the surface comprises a rough overlay comprising insulating material; subsequent to detecting the threshold crossing, detecting an event on the function of the one or more sensor signals based on a comparison of a high-pass filtered version and a low-pass filtered version of the one or more sensor signals, the high-pass filtering being enabled subsequent to the threshold crossing, the comparison identifying a sensor signal edge generated in response to a strong press made on the rough overlay of the touch-sense device, the sensor signal edge being generated based on a change in a magnitude of the function of the one or more sensor signals and a transition from the first capacitance to a second capacitance associated with an increased conformance of a finger with the rough overlay; where the strong press applies more force to the rough overlay of the touch-sense device than the light press; where the strong press conforms more to the rough overlay than the light press without creating airgaps between the rough overlay and the finger; and reporting, in response to the detecting the event, the strong press.