Method and apparatus for converting the location and movement of

Details Method and apparatus for converting the location and movement of Method and apparatus for converting the location and movement of

1975-07-31

1976-09-28

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

340347AD, G08C 2100

Patent

active

039833224

ABSTRACT:
A system is disclosed for converting the location and movement of a manually controlled instrument into corresponding electrical signals. The manually controlled instrument responds to the phase and frequency of an electrical field that varies to represent position information on an orthogonal writing grid. A single, phase-locked loop is utilized to produce both a first signal corresponding to the instrument location along an x-axis and as second signal corresponding to the instrument location along a y-axis. The first and second signals both represent the differential between pairs of related absolute signals. The differential signals are independent of normal signal variations and other error sources.

REFERENCES:
patent: 3591718 (1971-07-01), Asano et al.
patent: 3767858 (1973-10-01), Rodgers
patent: 3851097 (1974-11-01), Rodgers
patent: 3865977 (1975-02-01), Hiraki et al.

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