Patent ID: 7698084
Filing Date: 2010-04-13
Classification: G06F

Abstract:
1. A method for determining when a force sensor signal baseline in a force-based input device can be updated, the method comprising: accepting a force sensor signal associated with a touch activity; determining a force sensor signal range comprising a difference between a decaying maximum of the force sensor signal and a decaying minimum of the force sensor signal, wherein the force sensor signal range decays with time and the force sensor signal range is reset when the force sensor signal exceeds a current range; declaring a touch event when the force sensor signal range exceeds a predetermined activity threshold; determining a baseline for the force sensor signal; holding the previously determined baseline for the force sensor signal when a touch event is declared; updating the previously determined baseline for the force sensor signal when a touch event is not declared; and outputting a conditioned force sensor signal that is adjusted based on the updated baseline for the force sensor signal.