| 摘要 |
The invention relates to amplifying-receiving-switching devices and local electroconducting communication and loudspeaker address systems in motor coach performing functions of half-duplex voice communication in the directions “cab-cab”, “car-cab”, “cab-car". An amplifying-receiving-switching device includes a pulse transformer 2 of dc voltages, which input is connected to a source 3 of dc power, a protecting cutout device power amplifier resistor filter 7 of high frequencies, a voltage amplifier 8 connected to a loudspeaker 9 of operator's cab, three controlled keys 10, 11 and manipulator mixer 14, OR element 15, AND element 16, NOT element communication and loudspeaker address system of an electric train comprises located at opposite ends of electric train amplifying-receiving-switching device 1 and amplifying-receiving-switching devices 26 connected by a line 18 of alerting, to which the speakers 19 are connected, and a communication line 20, to which interphone systems 21 of passengers are connected. |
