| 摘要 |
PROBLEM TO BE SOLVED: To provide a high quality radio digital subscriber telephone system for improving frequency utilization efficiency by FDMA/TDMA. SOLUTION: By using radio digital time division multiplex transmission channels between a base station mutually connected with an analog or digital public communication network and plural fixed or mobile subscriber stations, voice signals, data signals, facsimile signals and video, etc., are radio- transmitted. Signals entering from a telegraph bus 14 are passed through a switchboard 25, connected through a coder 16 inside a single voice coder 17, a channel controller 18 and an RFU 21 to an RF channel and made to reach a radio subscriber. It is similar in a reverse course as well. The base station is provided with the channels for plural units, the channels are appropriately connected and switched by a PBX call processor 24, an RPU 20 and a system timing device 35, etc., and utilization efficiency is improved. |
