| 摘要 |
A switching system and a method of remote switching an electrically operated device by using calling signals generated by a telephone. A switching element is actuated by the system upon detecting a specific code of the calling signals generated by the telephone and validating a predetermined number of these calling signals. The calling signals are treated by a processing circuit which in turn conditions circuit elements to actuate the switching. More specifically, but not exclusively, the calling signals are sound signals generated by the telephone and the switching system is located in proximity to the telephone source whereby to receive the sound signals.
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