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Perceptual based analysis of the Concord algorithms for intra-talkspurt playout delay adaptation

The Concord mechanism (Sreenan, C.J. et al., IEEE Trans. Multimedia, vol.2, no.2, p.88-100, 2000) was developed as an efficient solution for playout delay adaptation in voice over IP (VoIP) networks. Playout delay adaptation techniques are used in real time voice communication over packet-switched networks to compensate for the effect of network jitter at the receiver. The performance of algorithms such as Concord is often analysed based on statistical metrics such as the mean buffering delay and average packet loss rates suffered. However, an analysis of the resulting voice quality achieved would present a more holistic view of the performance of a playout delay adaptation technique. An in-depth analysis of the Concord algorithms from a voice quality perspective is presented. Measured Internet network delays are used in the analysis where the resultant voice quality is measured using PESQ, the ITU-T P.862 objective voice quality measurement algorithm.