H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/79
H04B 3/54 (2006.01) H02J 13/00 (2006.01) H05B 37/02 (2006.01)
Patent
CA 1054946
ABSTRACT A method of transmitting information in an alternating current electricity supply system by alteration of the supply voltage waveform during a corresponding time period in selected cycles of the supply voltage wherein each said alteration is effected by drawing from the supply system during a period including a voltage zero a current of sufficient magnitude to reduce the supply voltage during that said period. -1-
231716
Cross Michael W. A.
Fielding Geoffrey
Gray Frederick M.
Perez-Cavero Leonardo
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