Method for determining when a force sensor signal baseline in a force-based input device can be updated
AssigneeQSI Corporation
InventorDavid A. Soss
Life of this patent
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Abstract
Disclosed is a method for determining a force sensor signal baseline in a force-based input device. The method includes accepting a signal associated with touch activity and determining a signal range, wherein the signal range decays with time and is reset when the signal exceeds the current range. A touch event is declared when the signal range exceeds a predetermined activity threshold. A previously determined baseline is held when a touch event is declared, and updated when a touch event is not declared.
Claims8
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;
- holding a previously determined baseline for the force sensor signal when a touch event is declared;
- updating a 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.
Dependencies are inferred from the claim text.