Audio mixer for multi-party conferencing in VoIP

Chandra, Sekhar P; Senthil, Kumar Mani; Bala, Manikya Prasad.P

doi:10.1109/imsaa.2009.5439490

Cited by 9 publications

(2 citation statements)

References 4 publications

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“…Evaluating and comparing audio mixers for MVoIP has been done by Chandra et al in 2009. They proposed their own algorithm which outperforms the others in terms of quality and complexity [5]. In 2009, Mani et al studied MVoIP systems based on the RTP bandwidth used, the quality degradation due to trans-coding and the placement of voice-enhancement modules.…”

Section: Related Workmentioning

confidence: 99%

SDN-driven multicast streams with adaptive bitrates for VoIP conferences

Hasrouty

Autefage²,

Olariu³

et al. 2016

2016 IEEE International Conference on Communications (ICC)

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Achieving high-quality voice conference calls over the Internet is a difficult task. Heterogeneous mobile devices and network dynamics must be properly managed by multiparty VoIP systems to ensure a good quality of experience. In this paper, we propose a multiparty VoIP system based on SDN technology that uses both multicast distribution and dynamic stream adaptation to optimize the conference call quality for each participant. We define a tree construction algorithm that includes two modes: a minimum spanning tree mode and a shortest path tree mode. We have simulated conference calls with various parameters and results show that a trade-off can be achieved between path latency and bandwidth consumption when using multicasted streams with adaptive bitrates. Compared to a typical multiparty VoIP system, up to two-third bandwidth consumption reduction is possible with only a small increase of the average path latency. Our solution could be leveraged by other types of real-time applications such as online gaming.

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Section: Related Workmentioning

confidence: 99%

SDN-driven multicast streams with adaptive bitrates for VoIP conferences

Hasrouty

Autefage²,

Olariu³

et al. 2016

2016 IEEE International Conference on Communications (ICC)

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“…Our work is related to the MixNStream work of Yuen and Chan [1], in which an overlay network of servers is constructed and continually updated to support video distribution with a small worst-case delay. In other works on mixing, [5] presents a mixing algorithm that minimizes the difference between generation times of the media packets in the absence of globally synchronized clocks and in the presence of jitter in transmission delays, [6] investigates different types of mixing algorithms and proposes objective methods for evaluating their performance, and [7] proposes a simpler MCU using algorithms for echo cancelation.…”

Section: Introductionmentioning

confidence: 99%

Virtual mixer: Real-time audio mixing across clients and the cloud for multiparty conferencing

Jun

Yuan

Zhu

et al. 2012

2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Traditional multiparty audio or video conferencing uses a single node, sometimes called a multipoint control unit, or MCU, to mix audio data for the conference. We introduce a novel mixer, called a Virtual Mixer, which performs mixing in a distributed way over the network. The Virtual Mixer topology is optimized over Steiner trees using a metric of either average pairwise delay (APD) or maximum pairwise delay (MPD). Since the topology is adapted to the particular set of clients and servers available in the cloud, optimization speed is important. In order to solve this NPhard Steiner tree optimization, we propose heuristic algorithms for finding the Pairwise-delay-optimal Tree (PT) for both APD and MPD, which are orders of magnitude faster than exhaustive search, yet find trees with delays that are minimal or within a few percent of minimal. We show through experiments both on a corporate intranet and on up to 12 PlanetLab nodes that Virtual Mixing can reduce both the APD and the MPD between clients by upwards of 50%, compared with the existing MCU-based and P2P-based mixing approaches.

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Audio mixer with Automatic Gain Controller for software based Multipoint Control Unit

Baskaran

Wong

2010

2010 IEEE Asia Pacific Conference on Circuits and Systems

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Audio mixer for multi-party conferencing in VoIP

Cited by 9 publications

References 4 publications

SDN-driven multicast streams with adaptive bitrates for VoIP conferences

SDN-driven multicast streams with adaptive bitrates for VoIP conferences

Virtual mixer: Real-time audio mixing across clients and the cloud for multiparty conferencing

Audio mixer with Automatic Gain Controller for software based Multipoint Control Unit

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