TOUCH PAD
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United States of America Patent
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Issued Date -
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app pub date -
Nov 26, 2012
filing date -
Feb 6, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A touch pad includes transducers for receiving acoustic signals resulting from touch events, such as the continuous movement of a fingertip across the surface of the touch pad. The acoustic signals are acquired at different transducer locations in the surface. Signals from different transducers are combined, preferably in antiphase, to improve signal characteristics. The transducer signals are supplied to a stereo analogue to digital converter. Phase differences are obtained and compared with phase difference profiles of known location, in order to identify the location of the touch event. An index is used to identify candidate locations to reduce the amount of processing. Interpolation is used to locate the touch event between profile locations.
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