| 摘要 |
PURPOSE:To allow plural visitors to talk with plural houses at the same time by providing plutal talking operating sections to a master set and connecting the master set and house equipments with the talking line of plural channels. CONSTITUTION:A system is provided with a common gate door equipment 1, house equipments 2 installed at each house and a transmission line 3 and a multiplex talking line 4 connecting the equipment 1 and the house equipments 2 and a multiplex talking line has 5 channels of talking lines 4-1...4-5. The common gate door equipment 1 has plural talking operation sections 5-1, 5-2,... provided each with a talking microphone and speaker or a handset. A visitor calls a called house from the idle talking operating section of the common gate door equipment 1, a control section 6 sends a selection signal to the transmission line 3 to connect the idle talking line and the talking operation section. In a house equipment 2, a selection control section 10 actuate a switch 9 according to a selection signal to connect the talking line and a talking circuit 8. |
