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http://dx.doi.org/10.7776/ASK.2013.32.2.157

Non-Intrusive Speech Quality Estimation of G.729 Codec using a Packet Loss Effect Model  

Lee, Min-Ki (연세대학교 전기전자공학과 디지털 신호처리 연구실)
Kang, Hong-Goo (연세대학교 전기전자공학과 디지털 신호처리 연구실)
Publication Information
The Journal of the Acoustical Society of Korea / v.32, no.2, 2013 , pp. 157-166 More about this Journal
Abstract
This paper proposes a non-intrusive speech quality estimation method considering the effects of packet loss to perceptual quality. Packet loss is a major reason of quality degradation in a packet based speech communications network, whose effects are different according to the input speech characteristics or the performance of the embedded packet loss concealment (PLC) algorithm. For the quality estimation system that involves packet loss effects, we first observe the packet loss of G.729 codec which is one of narrowband codec in VoIP system. In order to quantify the lost packet affects, we design a classification algorithm only using speech parameters of G.729 decoder. Then, the degradation values of each class are iteratively selected that maximizes the correlation with the degradation PESQ-LQ scores, and total quality degradation is modeled by the weighted sum. From analyzing the correlation measures, we obtained correlation values of 0.8950 for the intrusive model and 0.8911 for the non-intrusive method.
Keywords
Speech quality estimation; Packet loss concealment; G.729; PESQ; VoIP;
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