Noise cancellation for non-ideal electrostatic shielding

Details Noise cancellation for non-ideal electrostatic shielding Noise cancellation for non-ideal electrostatic shielding

1994-10-04

1996-11-12

Chin, Wellington

Telegraphy

Systems

Position coordinate determination for writing

178 18, 178 20, 345173, 345176, 345178, 345179, G08C 2100, G09G 302

Patent

active

055742629

ABSTRACT:
Cancellation of electrostatic noise in digitizing tablet having a shield supplying a signal proportional to the electrostatic noise which is subtracted from the information signal derived from a digitizing grid. A conductive transparent shield is interposed between a digitizing grid and image source so that the same electro-static noise on both. The shield may be grounded on zero to n-1 edges, n being the number of edges of the shield. An electrical signal is taken from an ungrounded side and supplied as an input signal to a difference amplifier, the other input signal being the information signal from the digitizing grid. The output signal from the amplifier is the information signal with the noise signal component cancelled.

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