Control system for broadcasting in apartment wherein the by-pass switching device for household speaker

摘要

In consideration of the problem of broadcasting at a low volume from a household speaker to an emergency signal, which eliminates noise pollution by adjusting the volume of the broadcast sound guided through the apartment's broadcasting system with a volume control variable resistor, the low voice signal in peacetime is output at a low volume adjusted through the volume control variable resistor (VR1), and when a high output signal by the emergency signal broadcast input is applied to the input terminal of the bridge rectifier (D), a DC voltage is output at the output terminal of the relay (Ry ), the emergency signal input to the speaker is input through the bypass line (BL) that bypasses the volume control variable resistor (VR1) and is equipped with an emergency broadcasting line (L2) that is broadcast as an emergency signal without volume control. A bypass connection device for each household speaker of an apartment broadcasting system is provided.