| 摘要 |
PROBLEM TO BE SOLVED: To provide a TDMA/TDD radio transmitter-receiver by which one-to- multiple speaking is enabled and a speech coverage range can be extended by interposing plural radio equipments. SOLUTION: A received signal from an antenna 30 is twice frequency- converted, amplified, demodulated by a MODEM part 36 later, converted to an ADPCM signal by a channel CODEC 37 according to a communication protocol, converted into a voice signal by an ADPCM CODEC 51 and stored in a demodulated data storage means 53. The stored data are converted into an ADPCM signal by the ADPCM CODEC 51, transformed by the channel CODEC 37 so as to be inputted to another channel in the same slot as reception or to be inputted to the other channel following the reception slot for arbitrary slots, modulated by the MODEM 36, orthogonally modulated by an orthogonal modulation circuit 47, amplified later and sent out. |
