| 摘要 |
PURPOSE:To minimize the increase in hardware-quantity for the increase in the number of conference-attendants by limiting the number of speakers allocated to a group of attendants in order to limit the number of voices to be added with each other, thereby reducing the capacity of memory and the processing time. CONSTITUTION:The PCM voice signals from all the subscribers multiplexed by time-dividing are inputted to a voice detection circuit 20 and the first delay circuit 30 through an input signal terminal 10. The circuit 20 outputs a subscriber's voice signal including the sound and a multiplex channel number to a storage circuit 40. In an accumulator circuit 60, the total sum of the voice signals is obtained after the lapse of time for one frame in accordance with an instruction from the storage part of a microprocessor 80. The microprocessor 80 collates the channel number to be multiplexed and a number outputted from the second delay circuit 50, and selects a voice-adding signal to be inputted to a subtracter circuit 70, and outputs it to an output signal terminal 100 as a multiplex output signal.
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