CAPACITIVE TOUCH SENSOR
First Claim
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1. A method of sensing the occurrence of a touch comprising:
- sampling the output of a touch sensor circuit supplied with a high level carrier signal at least once,sampling the output of a touch sensor circuit supplied with a low level carrier signal at least once,determining the occurrence of a touch by using at least one of said high level carrier samples and at least one of said low level carrier samples.
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Abstract
A touch sensor that includes sampling the output of a touch sensor circuit supplied with a high level carrier signal at least once, sampling the output of a touch sensor circuit supplied with a low level carrier signal at least once and thereby determining the occurrence of a touch by using at least one of said high level carrier samples and at least one of said low level carrier samples.
20 Citations
35 Claims
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1. A method of sensing the occurrence of a touch comprising:
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sampling the output of a touch sensor circuit supplied with a high level carrier signal at least once, sampling the output of a touch sensor circuit supplied with a low level carrier signal at least once, determining the occurrence of a touch by using at least one of said high level carrier samples and at least one of said low level carrier samples. - View Dependent Claims (2, 3)
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4. A method of sensing the occurrence of a touch comprising:
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generating a modulated signal, applying said modulated signal to the input of a touch sensor, sampling the output of said touch sensor during a first (high) portion in the modulated signal to obtain one or more samples of said output during said high portion, sampling the output of said touch sensor during a second (low) portion in the modulated signal to obtain one or more samples of said output during said low portion, determining the occurrence of a touch by using at least one of said high samples and at least one of said low samples. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17)
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16. The method of sensing the occurrence of a touch as claimed in 14, wherein at least one of said first digital filter and said second digital filter ate a forgetting factor filter.
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18. A sensor device, comprising:
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a touch sensor for switching a circuit, a waveform generator for generating a modulated signal including alternating high and low voltage regions, a sampler adapted to repeatedly sample high regions and low regions of said modulated signal and provide first portion data relating to said high region and second portion data relating to said low region, and a processor programmed to determine the occurrence of a touch from said first and second portion data. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 27, 28, 29)
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26. A sensor device as claimed in 24, wherein at least one of said first digital filter and said second digital filter is a forgetting factor filter.
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30. An appliance including a touch sensor device, wherein said touch sensor device comprises:
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a touch sensor circuit, a signal generator for generating a modulated signal including a carrier signal modulated by a modulation signal, a sampler adapted to sample said modulated signal, and a processor adapted to determine the occurrence of a touch wherein said carrier signal is at least twice the frequency of said modulation signal. - View Dependent Claims (31, 32, 33, 34, 35)
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Specification