Cancellation of common-mode signals in digitizing tablet

Details Cancellation of common-mode signals in digitizing tablet Cancellation of common-mode signals in digitizing tablet

1994-02-04

1999-08-31

Vo, Don N.

Telegraphy

Systems

Position coordinate determination for writing

178 1905, G08C 2100

Patent

active

059456396

ABSTRACT:
The invention concerns apparatus for processing signals induced by a stylus applied to a digitizing tablet. The tablet produces four signals, A, B, C, and D, indicative of four currents, induced at four different points on the tablet, by the stylus. The four signals indicate the position of the stylus. The invention derives stylus position based solely on two difference pairs (A-D) and (B-C). Further, the computation of the difference-pairs suppresses common-mode noise, which otherwise interferes with computation of stylus position.

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