| 摘要 |
PURPOSE: A megaphone with a multiple output function is provided to unitively adjust a group of slave megaphones by making a user voice of a master device be outputted through speakers of other megaphones switched into slave devices. CONSTITUTION: A microphone(1) converts an input voice signal into an electrical signal, and a speaker outputs the electrical voice as an audible sound. A mode switch(M) makes a user select one of a normal mode, a master device mode and a slave mode so as for a megaphone to operate. An antenna(14) transmits and receives a voice signal to and from other megaphone devices. A transmitter(132) modulates a voice signal from a voice signal process part into the first frequency signal. A receiver(133) demodulates a voice signal from a received signal of the first frequency through a transmission-reception separating part. The transmission-reception separating part(14) outputs a transmission frequency from the transmitter through the antenna and separates a signal received through the antenna to output the separated signal to the receiver. A voice signal processing part(12) amplifies an input voice signal and selectively couples as an input of the speaker or the transmitter an output voice signal of the microphone or the receiver under the control of a controller. The controller(10) controls the voice signal processing part according to an operated state of the mode switch so that the input voice signal from the microphone may be transferred to the speaker in a normal mode, so that the input voice signal from the microphone may be transferred to the transmitter in the master device mode, and an input voice signal from the receiver may be transferred to the speaker in the slave mode.
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