Method and apparatus for reducing noise in an electrostatic digi

Details Method and apparatus for reducing noise in an electrostatic digi Method and apparatus for reducing noise in an electrostatic digi

1996-02-09

1999-01-12

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1802, 178 1807, 178 2003, 178 2004, 345174, 345178, G08C 2100, G09G 500

Patent

active

058593926

ABSTRACT:
A method for reducing the effect of a noise impulse in a digitizing panel which includes a resistive layer is disclosed. The method includes the steps of generating a signal when an object is in proximity to the digitizing panel, amplifying the signal with an amplifier, detecting the presence of the noise impulse coupled to the resistive layer, and disconnecting an input of the amplifier from the resistive layer in response to detecting the noise impulse. In addition, a digitizing panel is disclosed which includes a resistive layer for providing a signal when an object is in proximity to the digitizing panel.

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IBM Technical Disclosure Bulletin; vol. 38, No. 5, May 1, 1995, pp. 47-49; XP000519491; Pen Tablet Synchronizing Digitizer with Sample and Hold Window Locking.
Electronic Design; vol. 40, No. 22; Nov. 2, 1992; pp. 80-81, 84; Chip Set Simplifies the Design of Pen-Based PCS.

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