Frequency conversion in a touch sensor
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United States of America Patent
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Jan 16, 2018
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app pub date -
May 24, 2017
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 in a first range and having a first frequency spacing on at least a plurality of the rows, respectively, and a heterodyning frequency converter. The heterodyning frequency converter receives a signal present on a column, the signal comprising signals within the first range and having the first frequency spacing. The heterodyning frequency converter converts the signal to a heterodyned signal comprising signals in a second range and having the first frequency spacing, and outputs the heterodyned signal. A touch processor identifies touch on the touch interface at least in part by processing the heterodyned signal.
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