| 摘要 |
PURPOSE:To allow plural visitors to talk with plural houses at the same time by providing plural talking operating sections to a master set and connecting the master set and each house equipment group with the channels of separate talking lines. CONSTITUTION:A system is provided with a common door equipment 1, housing equipments 2-11, 2-12,... installed in each house, a transmission line 3 and a multiplex talking line 4 connecting the common door set 1 and each house equipment, the multiplex talking line has talking lines 4-1, 4-2,... and each housing equipment is divided into plural housing groups 2-1, 2-2,.... The common door equipment 1 has plural talking operation section 8-1, 8-2,... provided each with a handset such as talking microphone and speaker. A visitor calls a house from the idle channel operating section of the common door set 1, a control section 10 sends a house selection signal to the line 3 to control a cross connection section 9 so as to connect the talking line and the talking operation section. |
