In VoIP system, the performance of network transmission makes a fundamental impact on quality of experirn ce. However, the traditional research based QoS can not be directly reflected to be Quality of Experience. We combined ITU PESQ and E-model algorithm and made a comprehensive analysis of the impact on user experience which was caused by packet loss, end-to-end delay,jitter, voice coding, and so on. Our contributions are thus twofold: firstly, we of-fered a detailed analysis of the impact of these parameters and their interactions on the perceived conversational quality.Secondly,we adopt regression model for single-ended(nonintrusive) method for objective speech quality estimation according to different conditions. The experimental results show that the objective assessments are correlated well with objective assessments ones,which indicates that the method proposed here is effective.%在VoIP系统中,传输网络性能(QoS)参数对可感知语音质量(Quality of Experience,QoE)起着基础性的影响作用,但QoS取值情况并不能直接反映和代表QoE水平.为此,基于对VoIP传输特征的分析,首先采用PESQ,EModel算法分析了单个QoS参数对QOE损伤的影响;在单个因素计算的基础上,通过对E-Model算法的扩展研究了QoS参数综合作用情况下语音QoE值的变化情况;采用回归分析的方法建立了QoS参数与语音QoE的映射模型,模型构成简单.验证实验表明,该模型与语音QoE客观评价方法之间具有很高的相关度,满足时网络运行状况及VoIPOoE实时监测的要求.
展开▼
