Phase reference system for cordless looping digitizer

Details Phase reference system for cordless looping digitizer Phase reference system for cordless looping digitizer

1991-09-16

1993-08-10

Schreyer, Stafford

Telegraphy

Systems

Position coordinate determination for writing

331166, G08C 2100

Patent

active

052351424

ABSTRACT:
In a cordless, electro-magnetic digitizing system having a drive circuit outputting a square wave drive signal of known initial polarity to a transducer coil in a cursor to oscillate the transducer coil and cause a magnetic field output therefrom which is detected in an associated tablet, a method of operation and associated apparatus for determining the phase of a response signal induced by the magnetic field from the response signal itself. The method comprises the steps of, outputting bursts of a square wave drive signal of known initial polarity to the transducer coil; outputting a signal indicating the start of each burst to the transducer coil; additively outputting a single large current square wave signal pulse to the transducer coil of the same polarity and in phase with a first square wave pulse of the square wave drive signal when initially outputting a burst of the square wave drive signal to the transducer coil whereby additive initial drive currents cause the transducer coil to oscillate immediately and produce a detectable first half-wave in a response signal in the tablet; and, employing the first half-wave of the response signal of known polarity to determine the phase.

REFERENCES:
patent: 4873499 (1989-10-01), Algor
patent: 5073685 (1991-12-01), Kobayashi et al.

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