INTERFERENCE DETECTION
First Claim
1. A method for detecting interference in an input device, the method comprising:
- driving a transmitter signal onto a transmitter sensor electrode of the input device;
receiving a resulting signal from a receiver sensor electrode of the input device;
sampling a first value associated with the resulting signal during a first half of a sensing cycle;
sampling a second value associated with the resulting signal during a second half of the sensing cycle;
generating an interference value based on the first value and the second value;
determining, based on the first value and the second value, an input in a sensing region of the input device; and
comparing the interference value to a noise threshold.
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Accused Products
Abstract
A method for detecting interference in an input device, the method involving: driving a transmitter signal onto a transmitter sensor electrode of the input device; receiving a resulting signal from a receiver sensor electrode of the input device; sampling a first value associated with the resulting signal during a first half of a sensing cycle; sampling a second value associated with the resulting signal during a second half of the sensing cycle; generating an interference value based on the first value and the second value; determining, based on the first value and the second value, an input in a sensing region of the input device; and comparing the interference value to a noise threshold.
42 Citations
20 Claims
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1. A method for detecting interference in an input device, the method comprising:
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driving a transmitter signal onto a transmitter sensor electrode of the input device; receiving a resulting signal from a receiver sensor electrode of the input device; sampling a first value associated with the resulting signal during a first half of a sensing cycle; sampling a second value associated with the resulting signal during a second half of the sensing cycle; generating an interference value based on the first value and the second value; determining, based on the first value and the second value, an input in a sensing region of the input device; and comparing the interference value to a noise threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An input device configured to sense input objects in a sensing region, the input device comprising:
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transmitter circuitry configured to drive a transmitter signal onto a transmitter sensor electrode of an input device, wherein the transmitter signal comprises a transmitter waveform with repeating cycles, and wherein each cycle comprises a transition; receiver circuitry configured to receive a resulting signal from a receiver sensor electrode of the input device, the receiver circuitry comprising; accumulator circuitry comprising an amplifier and configured to; accumulate a first value of the resulting signal during a first half of a sensing cycle; and accumulate a second value of the resulting signal during a second half of the sensing cycle; demodulator circuitry configured to; determine an input from the sensing region of the input device based on the first value and the second value; and generate an interference value based on the first value and the second value; and control circuitry comprising a first comparator and configured to; generate, using the first comparator, a first comparison of the interference value and noise threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification