基于流特性和真值程度的VoIP语音质量单端客观评价  

Flow features and truth scale based single-ended objective assessment of perceived quality of VoIP service

作　　者：成卫青[1] 龚俭[1] 丁伟[1] 

机构地区：[1]东南大学计算机科学与工程学院

出　　处：《通信学报》2008年第4期30-39,共10页Journal on Communications

基　　金：国家重点基础研究发展计划(“973”计划)基金资助项目(2003CB314804);南京邮电大学攀登计划基金资助项目(NY206010)~~

摘　　要：提出了一种仅利用IP流特性预测VoIP感知服务质量(PQoS)的非侵入单端客观评价方法——FSPAV,其关键是定义了3个与用户感知相关的流特性测度。不需要同步时钟或解析应用协议,仅需要监测用户主机接收到的包含对端用户语音数据的IP分组计算测度。使用个体真值程度度量,将通话片段的3个测度测量值映射成一个通话质量客观评价值,计算过程中还能得出每个特性的优劣程度。在互联网上利用VoIP软件QQ和Skype进行多次语音通话实验,实验结果显示主、客观评价值之间具有相当高的相关性,表明了本方法的有效性。A noninvasive, single-ended objective quality assessment method called ＂FSPAV＂, which only utilized IP flow features to predict the perceived quality of VolP service （PQoS） was proposed. The cores of the method are three PQoS related metrics of flow features. It only needs to monitor IP packets containing voice data from the peer user received by a local end user to calculate metrics, with no need to synchronize clocks or parse application protocols. A measure of the individual truth grad is used to map the measurement values of three metrics on a call segment into a single speech quality prediction. During the calculation, the goodness grad for each flow feature can also be derived. Talk experiments on the Internet by using VoIP software QQ and Skype was presented. The experimental results show that the objective assessments correlate well with subjective ones, which indicates that the method proposed here is effective.

关 键 词：VOIP 语音质量客观评价 流特性 真值程度度量 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]