| 摘要 |
PURPOSE:To simultaneously transmit plural signals by using a multiplex radio line in a private branch radio communication system. CONSTITUTION:The sound of the handset 100 of a terminal 10 is digitized 300, the information signal 200 of a terminal 11 is fed to an interface circuit 500 through an interface circuit 400 and the circuits 400, 500 are controlled by a circuit 700. In the circuit 500, a sound, the information and a control signals are multiplexed together with a frame synchronizing signal to constitute one frame. This time division multiplex signal is fed to a terminal radio equipment 600 to modulate a carrier and fed to the radio equipment 20 of a private branch exchange. The signal is demodulated in the radio equipment 20, separated 30 and fed to a switch circuit 40. The control signal is fed to a main control part 50 and the frame synchronizing signal is separated and removed 30. Similarly, the multiplexing signal is transmitted from the radio equipment 20 of the exchange side and the respective signals are received in a terminal telephone set 11, a sound terminal 100 and an information terminal 200. According to such constitution, the signals of a sound and a non-sound systems can be simultaneously transmitted. |
