Load control receiver and method of operation

Communications: electrical – Systems – Selsyn type

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3408257, 34082564, 340310A, 375 94, 375 95, H04B 354, G08C 1900

Patent

active

044531567

ABSTRACT:
Method for detecting the presence or absence of an audio-frequency signal (V.sub.T) superimposed on a power supply network, the audio-frequency signal (V.sub.T) having a known frequency (f.sub.T) and an amplitude (A.sub.T) lying within a permissible range of amplitudes (.DELTA.A.sub.T), where the power supply network transmits a signal mixture (V) containing a fundamental (V.sub.g, f.sub.g, A.sub.g), harmonic frequencies (V.sub.H, f.sub.H, A.sub.H) thereof and interference frequencies (V.sub.S, f.sub.S, A.sub.S), which includes, with a microcomputer (M.sub.C), generating a signal at the same point on adjacent waves of the fundamental (V.sub.g);

REFERENCES:
patent: 4091361 (1978-05-01), Eichelberger et al.
patent: 4106007 (1978-08-01), Johnston et al.
patent: 4370563 (1983-01-01), Vandling
patent: 4379284 (1983-04-01), Boykin
patent: 4399547 (1983-08-01), Moore et al.

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