Method and system for noise reduction for digitizing devices
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
Jan 17, 1997
filing date -
Jan 17, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and methods for the detection of motions of a pointed object upon a writing surface such as a touchpad are disclosed. The motions will be detected and converted in an analog-to-digital converter to digital codes representing the location of the pointed object upon the touchpad. The motion will be translated into a pen detect signal indicating the presence of the pointed object upon the touchpad. The digital codes will be filtered to minimize noise and formed into a filtered absolute coordinates digital code. The filtered absolute coordinate digital code and the pen detect signal will be converted to a touchpad-computer interface protocol and transferred to a computer system for further processing.
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