FRAME-PHASE SYNCHRONIZATION IN FREQUENCY DIVISION MODULATED TOUCH SYSTEMS
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United States of America Patent
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Dec 28, 2017
app pub date -
Jun 28, 2016
filing date -
Jun 28, 2016
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Abstract
A system and method for performing frame-phase synchronization on received frames of signal on a touch detector. An apparatus and method for synchronizing frames with the phase of one or more simultaneously transmitted signals on a touch detector. One or more row conductors and one or more column conductors are arranged such that the path of the row conductor(s) cross the path of the column conductor(s). A signal emitter simultaneously initiates transmission of orthogonal signals on each of the rows at each of a plurality of intervals starting at a first time, the orthogonal signals having a known initial phase. A receiver starts receiving frames on the column at each of the intervals, starting at a later time. A signal processor determines a measure of the extent to which each of the orthogonal signals are present within the received frame—and thus, the extent to which they were transmitted across the touch detector. The determined measures may be reflected in a heat map reflective of the state of the touch detector, and comparison of successive heat maps (or measures) being reflective of touch or changes in touch.
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