Digitizer tablet with reduced radiation susceptibility

Details Digitizer tablet with reduced radiation susceptibility Digitizer tablet with reduced radiation susceptibility

1990-11-20

1992-05-12

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

051130424

ABSTRACT:
A digitizer tablet capable of reduced coordinate wobble due to beat interference between an induced display scan rate and the tablet scan rate by introducing a controlled delay to change the time between successive samples to increase the beat frequency to the point where it can be effectively filtered out.

REFERENCES:
patent: 3873770 (1975-03-01), Ioannou
patent: 3904822 (1975-09-01), Kamm et al.
patent: 4368351 (1983-01-01), Zimmer
patent: 4794208 (1988-12-01), Watson
patent: 4859814 (1989-08-01), Sciacero et al.
patent: 4896002 (1990-01-01), Papsin
Graphic Details, Stanford Diehl and Steve Apiki, Jan. 1989, Byte Magazine, pp. 162-174.

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