Noise cancellation in digitizing system and method

Telegraphy – Systems – Position coordinate determination for writing

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382 59, G08C 2100

Patent

active

048598143

ABSTRACT:
A digitizing system includes a differential noise reduction technique wherein spaced parallel grid conductors in a tablet are differentially sensed in order to cancel out locally induced noise signals. Grid conductors also are sensed in a single ended fashion to initially locate a grid conductor conducting a larger induced carrier signal amplitude than any other grid conductor and produce amplitude data that is used to eliminate ambiguities arising from differential sensing of pairs of spaced grid conductors.

REFERENCES:
patent: 4736073 (1988-04-01), Abernethy
patent: 4794208 (1988-12-01), Watson

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