Cordless digitizer local conductor phase reference system

Details Cordless digitizer local conductor phase reference system Cordless digitizer local conductor phase reference system

1991-09-27

1992-11-03

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

051608138

ABSTRACT:
In an electro-magnetic, cordless digitizer system wherein a transducer emits an AC magnetic field which is detected by a first grid of scanned parallel first wires in a tablet to provide positional data for the transducer in a first axis of a coordinate system and which are detected by a second grid of scanned second wires in the tablet to provide positional data for the transducer in a second perpendicular axis of the coordinate system, a method and associated apparatus for obtaining a phase reference signal; to be used in a demodulator demodulating data signals from the first and second grids of scanned first and second wires. The method comprises the steps of, scanning the first wires to determine ones of the first wires close to a present location of the transducer; connecting to a one of the first wires displaced from the ones of the first wires close to a present location of the transducer a sufficient distance to provide a valid and usable voltage for use in generating a phase reference signal; and, using a voltage from the one of the first wires to generate a phase reference signal to the demodulator when processing data signals from both the first grid of scanned parallel wires and the second grid of scanned wires.

REFERENCES:
patent: 4939318 (1990-07-01), Watson et al.
patent: 5045645 (1991-09-01), Hoendervoogt et al.

Affiliated with

Also associated with

Rating

Cordless digitizer local conductor phase reference system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cordless digitizer local conductor phase reference system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cordless digitizer local conductor phase reference system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2051522