Comparison and optimization of packet loss repair methods on VoIP perceived quality under bursty loss

Wenyu Jiang, Henning Schulzrinne
<span title="">2002</span> <i title="ACM Press"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/fp7e2lkusbg7rp3w3anyamnzea" style="color: black;">Proceedings of the 12th international workshop on Network and operating systems support for digital audio and video - NOSSDAV &#39;02</a> </i> &nbsp;
Packet loss degrades the perceived quality of voice over IP (VoIP). In addition, packet loss in the Internet tends to come in bursts, which may further degrade audio quality. Using the Gilbert loss model, we infer that changing the packet interval affects loss burstiness, which in turn influences forward error correction (FEC) performance. Next, we perform subjective listening tests based on Mean Opinion Score (MOS) to evaluate the effect of bursty loss on VoIP perceived quality. Then, we
more &raquo; ... e the perceived quality achieved by two major loss repair methods: FEC and low bit-rate redundancy (LBR). Our MOS test results show that FEC is much preferred over LBR. In addition, our MOS results reveal that, under bursty loss, FEC quality is much better with a moderately large packet interval. Finally, because FEC introduces an extra delay proportional to the packet interval, we present a method of optimizing the packet interval to maximize FEC MOS by considering the delay impairment in ITU's E-model standard. 1 We are not even counting link layer header bytes yet!
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