Amplitude modulated digitizer

Details Amplitude modulated digitizer Amplitude modulated digitizer

1981-02-12

1983-01-11

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

043683517

ABSTRACT:
A digitizer having a pointer or cursor driven by an alternating carrier signal and a grid of sequentially enabled parallel spaced conductors inductively coupled to the cursor includes an AM demodulator for detecting the instantaneous time of change of phase of the signal induced in the grid. In a preferred embodiment of the invention, a multiplier is used as the demodulator.

REFERENCES:
patent: 3904822 (1975-09-01), Kamm et al.
patent: 4080515 (1978-03-01), Anderson
patent: 4088842 (1978-05-01), Ikedo
patent: 4185165 (1980-01-01), Fencl
patent: 4206314 (1980-06-01), Prugh et al.
patent: 4243843 (1981-01-01), Rocheleau

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