| 摘要 |
FIELD: transport. ^ SUBSTANCE: invention relates to railway radio communication. Proposed system consists of transmitting side including series mike, FM signal transmitter, antenna-feeder circuit, and receiving side including series antenna-feeder circuit, FM signal receiver, and loud speaker. Additionally, proposed system transmitting side comprises auxiliary carrier frequency oscillator, mike amplifier connected in series to mike input, signal multiplier, two-way limiting amplifier of signal amplitude, bandpass filter, and coherent detector. Detector output is connected to FM signal transmitter mike input while auxiliary carrier frequency oscillator output is connected to signal multiplier HF input and coherent detector reference input. Proposed system receiving side comprises pulse generator, and time sampler, two-way signal amplitude limiting amplifier, time integrator, low-pass filter, all connected in series to receiver output, and audio frequency amplifier with its output connected to loudspeaker input. Pulse generator output is connected to HF input of time sampler. ^ EFFECT: higher noise immunity. ^ 1 dwg |
