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Adaptive playout mechanisms for packetized audio applications in wide-area networks

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4 Author(s)
R. Ramjee ; Dept. of Comput. Sci., Massachusetts Univ., MA, USA ; J. Kurose ; D. Towsley ; H. Schulzrinne

Recent interest in supporting packet-audio applications over wide area networks has been fueled by the availability of low-cost, toll-quality workstation audio and the demonstration that limited amounts of interactive audio can be supported by today's Internet. In such applications, received audio packets are buffered, and their playout delayed at the destination host in order to compensate for the variable network delays. The authors investigate the performance of four different algorithms for adaptively adjusting the playout delay of audio packets in an interactive packet-audio terminal application, in the face of such varying network delays. They evaluate the playout algorithms using experimentally-obtained delay measurements of audio traffic between several different Internet sites. Their results indicate that an adaptive algorithm which explicitly adjusts to the sharp, spike-like increases in packet delay which were observed in the traces can achieve a lower rate of lost packets for both a given average playout delay and a given maximum buffer size

Published in:

INFOCOM '94. Networking for Global Communications., 13th Proceedings IEEE

Date of Conference:

12-16 Jun 1994