Sensor signal conditioning in a force-based touch device
First Claim
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1. A method for estimating a touch location on a force-based input device, the force-based input device having a plurality of force sensors outputting a plurality of force sensor signals, the force sensor signals providing measurements of force transmitted to each force sensor by a touch force applied to the force-based input device, the method comprising:
- summing the plurality of force sensor signals to form a total force signal;
converting the total force signal to a scaling signal according to a predefined function;
conditioning each of the plurality of force sensor signals individually to form a plurality of conditioned sensor signals, wherein each force sensor signal is multiplied by the scaling signal and integrated during a touch event; and
estimating the touch location from the plurality of conditioned sensor signals.
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Abstract
Disclosed is method and device for signal conditioning in a force-based touch screen. In one embodiment, signal conditioning includes multiplying a force signal by a scaling signal which is a predetermined function of the total force applied to the force-based touch screen and integrating the force signal over a touch event.
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Citations
25 Claims
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1. A method for estimating a touch location on a force-based input device, the force-based input device having a plurality of force sensors outputting a plurality of force sensor signals, the force sensor signals providing measurements of force transmitted to each force sensor by a touch force applied to the force-based input device, the method comprising:
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summing the plurality of force sensor signals to form a total force signal;
converting the total force signal to a scaling signal according to a predefined function;
conditioning each of the plurality of force sensor signals individually to form a plurality of conditioned sensor signals, wherein each force sensor signal is multiplied by the scaling signal and integrated during a touch event; and
estimating the touch location from the plurality of conditioned sensor signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a force-based input device having a plurality of force sensor signals, a method for conditioning a force sensor signal comprising:
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accepting a total force signal wherein the total force signal is related to a magnitude of a force applied to the force-based input device;
converting the total force signal to a scaling signal according to a predefined function;
multiplying the force sensor signal by the scaling signal to form a product signal; and
integrating the product signal during a touch event to obtain a conditioned signal. - View Dependent Claims (13, 14, 15)
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16. A device for conditioning a plurality of force sensor signals created by a plurality of force sensors in a force-based input device, the force sensor signals providing measurements of force transmitted to each force sensor by a touch force applied to the force-based input device, the device comprising:
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a summer configured to sum the plurality of force sensor signals and output a total force signal;
a scaling amplifier operatively coupled to the summer and configured to output a scaling signal which is a predefined function of the total force signal;
a plurality of multipliers operatively coupled to the scaling amplifier and configured to multiply each of the plurality of force sensor signals by the scaling signal and output a plurality of scaled sensor signals; and
a plurality of integrators operatively coupled to the plurality of multipliers and configured to integrate each of the scaled sensor signals and output a plurality of conditioned signals. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification