| 摘要 |
PURPOSE:To attain effective utilization of a frequency by using a 24-channel multiplexer at a center station, multiplexing a sound line to each terminal station at an outgoing line onto the same band and transmitting data to each terminal station in the same frequency. CONSTITUTION:A sound signal from voice lines 1-1-1-4 for each terminal station at a center station GC in an outgoing line DN is multiplexed by the 24-channel multiplexer 11. The multiplexed signal is transmitted from a common transmission/reception antenna 13 in a frequency f1 by a common PM transmitter 12 and transmitted to terminal stations TO-1-TO-4. On the other hand, an incoming signal is received by common antennas 17-1-17-4 at the terminal station side TO. The reception signal in the frequency f1 is demodulated by terminal station PM transceivers 18-1-18-4 and each demodulation output is outputted as the voice signal through sound lines 1-5-1-8 via 6-channel multiplexers 19-1-19-4. |
