Frequency conversion in a touch sensor
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United States of America Patent
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Jul 18, 2017
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app pub date -
Feb 4, 2015
filing date -
Feb 4, 2014
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Abstract
A touch sensitive device includes a touch interface having rows and columns, a signal generator for generating a plurality of unique orthogonal signals on at least a plurality of the rows, respectively, and a frequency converter. The frequency converter receives a first touch signal present on at least one of the plurality of columns, converts the first touch signal to a second signal having a second center frequency, and outputs the second signal. A touch processor is identifies touch on the touch interface by processing the second signal having the second center frequency and outputting touch event data.
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