Distributed type tone mixing system in multimedia conference

The invention relates to a distributing type sound-mixing system used in multimedia conferences. The sound-mixing system comprises a voice main server, a voice sub-server and a client end, wherein, the client end is connected with the voice sub-server, the voice sub-server is connected with the voice main server, and the client end comprises a voice collecting module used for transmitting the audio data stream formed during the conversation when talking with conference attendants; a voice sending module used for sending the collected audio data stream to the voice sub-server through real-time transmission protocol in the way of packaging the voice frame; a signal energy calculating module used for calculate the signal energy E after collecting the audio data stream; the voice main server and the voice sub-server used for networks presenting an arborescence shape; the voice main server realizes the final selecting algorithm, and the sub-voice server adopts the initial selecting algorithm. The invention provides a distributing type sound-mixing system which is used in multimedia conference and can reduce the CPU load of the server end and enhance the sound-mixing efficiency.