| 摘要 |
PURPOSE:To combine a conference group with channels optionally when speech addition is performed by providing an addition part which multiplexes digital speech signals to a bus on time-division basis and also extracts and adds corresponding data in multiplexed speech data corresponding to respective channels. CONSTITUTION:For example, three parties of channels 2, 4, and N form a group #1 and make a conference call. In this case, speech data of channels 2, 4, and N on the speech bus 11 and information on the group number #1 are supplied to the bus at the same time, so data of the channels 4 and N are added to the channel 2 and outputted, data of the channels N and 2 are added to the channel 4 and outputted, and data of the channels 2 and 4 are added to the channel N and outputted. The data of each channel never appears at the channel, so trouble such as howling is not caused. |
