Performance evaluation of speech quality for VOIP on the internet

Abstract

This thesis reports on a measurement study to evaluate the speech quality for two widely used VoIP codecs, Speex and SILK, on the Internet using the Perceptual Evaluation of Speech Quality (PESQ). To obtain realistic results, we developed our testbed on PlanetLab, so that all the experiments were conducted on a shared network. We chose different sets of parameters for each experiment for the two codecs to evaluate the speech quality under different conditions. Overall, we found that the SILK codec performs slightly better than the Speex codec.