PURPOSE: To enable an equipment, loaded, with its operating condition varied by an input analogically varying, by such means that an electrically physical quantity in control signal be analogically changed with the load controlled in accordance with an analog quantity of said electrically physical quantity.
CONSTITUTION: In a transmitter 3, is provided a method 5 that enables an electrically physical quantity analogically changed in the control signal wave, that is, amplitude, frequency, or phase. And in a receiver 4, is provided a method 6, that detects an electrically physical quantity, analogically changing, from the control signal to produce an output in accordance with an analog quantity of this electrically physical quantity. And by the receiver 4, that receivers a control sgial from the transmitter, is controlled a load 2 like illumination
ABIKO TOSHIO
SUZUKI YOSHIHARU
