| 摘要 |
PURPOSE: To attain 1:N speech by connecting each output of plural reception means in common to two inputs of plural transmission means. CONSTITUTION: When a terminal equipment A makes a conference telephone request with terminal equipments B-D, a signal from a transmitter T of the terminal equipment A passes through a No.1 channel of an incoming channel 2U from a virtual cross point up1 and is given to a reception circuit Rx-1 from a cross point up10, in which the signal is demodulated and outputted to be a sound signal. The voice signal is modulated by transmission circuits Tx-2-4 via cross points 1-2 to 4 of a matrix switch MS. Then the modulated signal is sent through channels No.6-8 of outgoing multi-channels 2D via virtual cross points dp60-80. In this case, since the vertical cross points dp6-8 are idle, the voice signal from the terminal equipment A is received simultaneously by the terminal equipments B-D. Similarly the voice signal from each terminal equipment is received simultaneously and the operation as conference telephone sets are obtained. |
