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专利名称：CAPACITIVE SENSING APPARATUS AND
METHODS
发明人：Kai Gossner申请号：US14300757申请日：20140610
公开号：US201500224A1公开日：20150122
专利附图：
摘要：One or more waveform generators impose an input waveform across touchsensor components. Phase shift detection logic measures a phase shift between the inputwaveform and an output waveform component associated with each waveform generator
appearing across a touch sensor component. Amplitude ratio detection logic measuresan output-to-input waveform magnitude ratio associated with each waveform generator.Translator logic converts the phase shift(s) and optionally the output-to-input waveformmagnitude ratio(s) to capacitance values. Validation logic compares the resulting
capacitance values to each other to determine consistency and validity during a particularwaveform sampling time. The phase shift detection logic and the amplitude ratiodetection logic are optionally implemented with discrete Fourier transform logic whichincludes narrow-band filtering to exclude electromagnetic interference frequencycomponents from touch sensor signal measurements.
申请人：Texas Instruments Deutschland GmbH
地址：Freising DE
国籍：DE
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