الفهرس | Only 14 pages are availabe for public view |
Abstract A number of significant technical problems exist in sending voice through a packet network . One of the most significant involves the reconstruction of a continuous stream of voice from a set of packets sent through the network. The core of this thesis is • how to design voice reconstruction system that reproduces acceptable quality speech from those packets that • arrive with long end-to-end delay • varying transit delay which depends on the packet network’s structure • and in some cases arrive out of order if those packets are routed independently . So • the received packets , ;.j·O’” Different reconstructi01 schemes are studied for the packet voice receiver, A new reconstruction scheme is proposed and developed based on integration of two studied schemes to avoid the disadvantages of both of them , Simulation models packetized voice transmission system wer developed for the to evaluate three types of voice packet reconstruction schemes , and to obtain the optimal packet length which keeps overall paCkjt transmission delay probability less than a certain permissible value Comparison among and packet loss three strategies is also stated with respect to the mean packet total delay and the statistical fluctuations of silence intervals , Key !fords : packet vo~ce communication ; voice reconstruction packet voice receiver ; reassembly algorithms ; optimal packet length ; dynamic priorities; service strategies Buffering smoothing schemes I synchronization |