Digitizer tablet using relative phase detection

Details Digitizer tablet using relative phase detection Digitizer tablet using relative phase detection

1993-04-08

1995-05-16

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

054162807

ABSTRACT:
In a digitizer and method for laying out and using the tablet of the digitizer, wherein the tablet provides unambiguous binary code outputs. The digitizer may employe a cordless transducer and signal processing circuitry providing relative phase detection for determining coarse location of the transducer. An unambiguous binary code output is obtained with a grid layout which generates a set of unique binary codes, none of which is the the same or the binary inverse of any other member of the set.

REFERENCES:
patent: 4705919 (1987-11-01), Dhawan
patent: 5051545 (1991-09-01), McDermott
patent: 5134253 (1992-07-01), Doubrava
patent: 5210380 (1993-05-01), McDermott
patent: 5218174 (1993-06-01), Gray et al.
patent: 5251123 (1993-10-01), Reiffel et al.

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