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CLC number: TP309

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Received: 2004-04-16

Revision Accepted: 2005-01-25

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Journal of Zhejiang University SCIENCE A 2005 Vol.6 No.6 P.507-512


Research on fast real-time adaptive audio mixing in multimedia conference

Author(s):  FAN Xing, GU Wei-kang, YE Xiu-qing

Affiliation(s):  Department of Information and Electronic Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   starfan@mail.hz.zj.cn

Key Words:  Multimedia conference, MCU, Real-time, Adaptive, Audio mixing, Aligned-to-self, Aligned-to-energy

FAN Xing, GU Wei-kang, YE Xiu-qing. Research on fast real-time adaptive audio mixing in multimedia conference[J]. Journal of Zhejiang University Science A, 2005, 6(6): 507-512.

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In multimedia conference, the capability of audio processing is basic and requires more for real-time criteria. In this article, we categorize and analyze the schemes, and provide several multipoint speech audio mixing schemes using weighted algorithm, which meet the demand of practical needs for real-time multipoint speech mixing, for which the ASW and AEW schemes are especially recommended. Applying the adaptive algorithms, the high-performance schemes we provide do not use the saturation operation widely used in multimedia processing. Therefore, no additional noise will be added to the output. The above adaptive algorithms have relatively low computational complexity and good hearing perceptibility. The schemes are designed for parallel processing, and can be easily implemented with hardware, such as DSPs, and widely applied in multimedia conference systems.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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[2] González, A.J., Abdel-Wahab, H., 1998. Audio Mixing for Interactive Multimedia Communications. JCIS’98, Research Triangle, NC, p.217-220.

[3] ITU-T, 2000. Packet-Based Multimedia Communication System. ITU-T Recommendation H.323 v4.

[4] Rangan, P.V., Vin, H.M., Ramanathan, S., 1993. Communication architectures and algorithms for media mixing in multimedia conferences. IEEE/ACM Transactions on Networking, 1(1):20-30.

[5] Schulzrinne, H., Caner, S., Frederick, R., Jacobson, V., 1996. RTP: A Transport Protocol for Real-time Applications. IETF RFC 1889.

[6] Tu, W., Hu, R.M., Ai, H.J., Xie, X., 2002. Audio MP in video conference. Geomantics and Information Science of Wuhan University, 27(1):98-101 (in Chinese).

[7] Yang, S.T., Yu, S.S., Zhou, J.L., 2001. A multipoint real-time speech mixing and scheduling algorithm based on packet networks. Journal of Software, 12(9):1413-1419 (in Chinese).

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