Signal Processing - Special issue on acoustic echo control
A delayless subband adaptive filter architecture
IEEE Transactions on Signal Processing
Dynamic QoS control of multimedia applications based on RTP
Computer Communications
H.323: the multimedia communications standard for local area networks
IEEE Communications Magazine
Multipoint communication: a survey of protocols, functions, and mechanisms
IEEE Journal on Selected Areas in Communications
Videoconferencing over packet-based networks
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Models for Analysis of Packet Voice Communications Systems
IEEE Journal on Selected Areas in Communications
Study on the extensibility of video conferencing with speech mixing
Computer Communications
ECCV'06 Proceedings of the 2006 international conference on Computer Vision in Human-Computer Interaction
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Multipoint communications makes it possible to exchange information among a set of participants and also the key technique to realize a distributed multiparty collaboration communications system. In this paper, a multipoint communications strategy is discussed based on our H.323 multipoint conferencing system. A new architecture, Speech Scheduling and Mixing System (SSMS), is proposed for speech mixing, and its key techniques, such as the synchronous control of real time speeches, the pre-fetching mechanism of speech data, and the method of buffer flush are discussed in order to guarantee the continuity of the mixed speech in a limited complexity. Moreover, echo problem in the conferencing system is observed and a delayless subband AEC is used to cancel acoustic echo. Simulations show that our H.323 system sounds better in the multipoint conferencing mode than those video conferencing products available, such as Microsoft Netmeeting, which is based on the same H.323 specification.