Digitizer using phase inversion detection system

Details Digitizer using phase inversion detection system Digitizer using phase inversion detection system

1986-05-19

1987-09-08

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

046925686

ABSTRACT:
In an electromagnetic induction type digitizer having a winding coil for generating magnetic field, a tablet having a plurality of conductive lines, a scanning circuit for detecting phase inversion of an induction signal induced on the conductive lines and counting means for counting the winding coil, the signal process circuit consists of an amplification circuit for amplifying the induction signal, a low pass filter for generating an envelope signal and a comparator for generating a load signal and the scanning circuit includes a decoder for controlling an analogue switch whereby a phase detector is eliminated and the signal process circuit becomes simple as compared with conventional signal process circuit.

REFERENCES:
patent: 4368352 (1983-01-01), Davis

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