DocumentCode :
1971287
Title :
DSP subsystem for multiparty conferencing in VoIP
Author :
Mani, S.K. ; Bala Manikya Prasad, P. ; Kamesh, M. ; Mani, Nallasamy
Author_Institution :
HelloSoft India Ltd., Hyderabad, India
fYear :
2009
fDate :
9-11 Dec. 2009
Firstpage :
1
Lastpage :
6
Abstract :
This paper deals with different types of configurations and network-architecture models used for multi-party conferencing in VoIP. A comparison of multi-party conferencing models is presented based on the bandwidth used by the Real Time Protocol (RTP) streams, quality degradation due to trans-coding if any, etc. Also, an efficient and simple architectural design of a media engine for decentralized conferencing with an end-point manager is presented. The investigation on the right placement of voice-enhancement modules in the media-engine is presented by analyzing the real time captured data. The proposed architectural design is extended for inter-operating with different VoIP-based terminals, which operate at different sampling rates such as 8 kHz, 16 kHz, 24 kHz etc. The proposed conferencing model contains ITU-T G.722, ITU-T G.722.1 Wideband codecs, Echo Cancellation (EC), Noise Cancellation (NC), Automatic Gain Controller (AGC) and other VoIP components implemented for IP-Phones running on desktop or laptop computers. The proposed system is able to connect up to ten conferees on a computer that has 1.6 GHz speed, 1GB RAM memory and Linux/Window 2000 or later operating system with wideband (16 kHz) voice quality.
Keywords :
Internet telephony; audio signal processing; codecs; real-time systems; AGC; DSP subsystem; EC; NC; RAM memory; RTP; VoIP; architectural design; automatic gain controller; echo cancellation; end point manager; laptop computers; media engine; multiparty conferencing; network architecture models; noise cancellation; operating system; quality degradation; real time captured data; real time protocol; voice enhancement modules; wideband codecs; Bandwidth; Codecs; Degradation; Digital signal processing; Echo cancellers; Engines; Protocols; Sampling methods; Speech analysis; Wideband; Automatic Gain Controller; Central server; Conferencing Bridge; Echo and Noise Canceller; PESQ score; Real Time Protocol (RTP);
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Internet Multimedia Services Architecture and Applications (IMSAA), 2009 IEEE International Conference on
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-4792-3
Electronic_ISBN :
978-1-4244-4793-0
Type :
conf
DOI :
10.1109/IMSAA.2009.5439487
Filename :
5439487
Link To Document :
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