| 摘要 |
PURPOSE:To realize a conference-type call for three persons or more via the single channel in a frame, by providing an attenuator at the single channel in the frame information and adding a data compounding part to each channel to add the own- generated information to the information given from other channels. CONSTITUTION:The loop transmission units 2-0-2-3 are connected by the loop transmission lines 3-0, and the attenuator LOSS is provided to the unit 2-0 which functions as the master station. At the same time, the data compounding parts 11-1-11-3 plus 12-1-12-3 are added to the units 2-1-2-3 to add the information of the own transmitter microphones 9-1-9-3 to the other information of other channels. Furthermore, the compound data receiving parts 12-1-12-3 are connected to the telephone receivers 10-1-10-3. Then the transmission of the frame information are given to N channels, and the data of the N channels can be attenuated by the attenuator LOSS. Thus a conference-type call becomes possible for three persons or more with use of the single channel in the frame. |
