Telegraphy – Systems – Position coordinate determination for writing
Patent
1992-02-18
1993-09-14
Schreyer, Stafford
Telegraphy
Systems
Position coordinate determination for writing
178 20, G08C 2100
Patent
active
052451399
ABSTRACT:
An apparatus and method for digitizer sampled point validation which determines the contact resistance at a point of contact between the upper and lower layers of the digitizer and compares the contact resistance with a valid range of contact resistances to either accept or reject the sampled point. The apparatus includes an analog drive circuit for driving the digitizer with one of a plurality of drive sources, a switch control logic coupled to the drive circuit for determining which drive source is coupled to the digitizer, an analog-to-digital convertor coupled to the digitizer, and a microcontroller coupled between the analog-to-digital convertor and the switch control logic. The method of the present invention determines the contact resistance, compares the contact resistance with the valid range, and determines and stores the location of the point if the contact resistance is within the valid range.
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patent: 4680429 (1987-07-01), Murdock et al.
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patent: 5008497 (1991-04-01), Asher
Brehm Joseph E.
Martin Wayne A.
Protheroe Robert L.
Martin Paul W.
NCR Corporation
Schreyer Stafford
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