Method and system for noise reduction for digitizing devices

Details Method and system for noise reduction for digitizing devices Method and system for noise reduction for digitizing devices

1997-01-17

1999-03-30

Luu, Matthew

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345174, G09G 500

Patent

active

058895116

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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patent: 5327161 (1994-07-01), Logan et al.
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patent: 5488204 (1996-01-01), Mead et al.
patent: 5543590 (1996-08-01), Gillespie et al.
patent: 5543591 (1996-08-01), Gillespie et al.

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