| 摘要 |
PURPOSE:To attain conference communication with optional number of participants to conferences and plural conferences at the same time by providing plural stages of voice adders of a conference trunk and allowing individually an output of each voice adder to be extracted. CONSTITUTION:A conference with a maximum nine subscribers is attained by using three voice adders of three-input and one-output (6b), (6c) and (6d) for the first stage and one voice adder (6e) for the 2nd stage, and in case of a conference with three subscribers, the three-party conference communication is attained by using one of the conference trunks of the 1st stage. Further, in case of two or three conferences by the three subscribers, it can be conducted by using individually the conference trunks of the 1st stage. A conference by four-six subscribers is realized by using two conference trunks of the 1st stage and one conference trunk of the 2nd stage. A conference with 7-9 subscribers is realized by using three conference trunks of the 1st stage and one conference trunk of the 2nd stage. |
