MULTIPLEX SPEAKING DEVICE

PURPOSE:To transmit simultaneously the same contents of conversation to plural originating subscribers by selecting one of plural orginating subscribers connected to a switch box, talking with the selected subscriber, and making other originating subscribers intercept the contents of speaking through a transmission means. CONSTITUTION:The switch box 25 is arranged to select one out of plural subscribers called by an operator and the switch box 25 connected to telephone sets 21, 22 is connected to respective lines through relays. The telephone sets 21, 22 are connected so as to selects a required line by the switch box 25 and transmit a signal in calling from a booster amplifier to an inductive distributor 47 connected to the switch box 25 through a loop antenna 46 by controlling its volume by a mixing amplifier 44. The inductive distributor 47 is arranged to make the originating subscribers who are not selected by the switch box 25 listen the speaking contents.