Intelligent voice smoother for silence-suppressed voice over Internet

Po-Lung Tien, Maria C. Yuang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


For transporting voice data with silence suppression over the Internet, the problem of jitter introduced from the network often renders the speech unintelligible. It is thus indispensable to offer intramedia synchronization to remove jitter while retaining minimal playout delay. We propose a neural-network-based intra-voice synchronization mechanism, called the intelligent voice smoother (IVoS). The IVoS is composed of three components: smoother buffer, neural network (NN) traffic predictor, and constant bit rate (CBR) enforcer. Newly arriving frames, being assumed to follow a generic Markov modulated Bernoulli process (MMBP), are queued in the smoother buffer. The NN traffic predictor employs an on-line-trained backpropagation neural network (BPNN) to predict three traffic characteristics of every newly encountered talkspurt period. Based on the predicted characteristics, the CBR enforcer derives an adaptive buffering delay. It then imposes such delay on the playout of the first frame in the talkspurt period. The CBR enforcer in turn regulates CBR-based departures for the remaining frames of the talkspurt, aiming at assuring minimal mean and variance of distortion of talkspurts (DOT) and mean playout delay (PD). Simulation results reveal that, compared to three other playout approaches, IVoS achieves superior playout yielding negligible DOT and PD irrespective of traffic variation.

Original languageEnglish
Title of host publicationICC 1998 - 1998 IEEE International Conference on Communications
Subtitle of host publicationNew Century Communications, Conference Record; Affiliated with SUPERCOMM 1998
Number of pages5
StatePublished - 1 Dec 1998
Event1998 IEEE International Conference on Communications: New Century Communications, ICC 1998 - Affiliated with SUPERCOMM 1998 - Atlanta, GA, United States
Duration: 7 Jun 199811 Jun 1998

Publication series

NameInternational Conference on Communications - Proceedings


Conference1998 IEEE International Conference on Communications: New Century Communications, ICC 1998 - Affiliated with SUPERCOMM 1998
Country/TerritoryUnited States
CityAtlanta, GA


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