《多媒体会议中新型快速实时溷音算法》.pdf

29 3 Vol.29No.3 2007 3 Journal of Electronics Information Technology Mar. 2007 ( 100876) : , , , , , , , , , : TN919.8 A 1009-5896(2007)03-0690-06 A Novel Fast Real-Time Audio Mixing Algorithm in Multimedia Conference Wang Wen-lin Liao Jian-xin Zhu Xiao-min Shen Qi-wei (State Key Lab. of Networking and Switching Tech., Beijing Univ. of Posts and Telecomm., Beijing 100876, China) Abstract: In multimedia conference, audio mixing is an essential component, which affects the communication between users. At present, the commonly used audio mixing algorithms have a protean volume. By analyzing those algorithms, the conclusion of mutative mixing weights bring on protean volume is drawn. Base on this, a novel algorithm named Asymmetrical Wave-Shrinking (AWS) is proposed. A fixed mixing weight independent of inputs is used to ensure the natural and fluent outputs without protean volume. Without multiplication and division operations, the algorithm is so simple and fast that it can be easily implemented by hardware and widely applied in large scale multimedia conference systems. Key words: Multimedia conference; APU (Audio Process Unit); Asymmetrical; Wave-shrinking; Audio mixing 1 [3] , ; [4,5] ; [6] , , , ; , [7] , H.323 , , , , , , , , , , , QoS(Quality of