Quantification Study on QoE of TCP-based Audio Steaming
GAO Yu;DOU Weibei;Department of Electronic Engineer,Tsinghua University;
QoE( Quality of Experience) degradation of TCP-based audio streaming mainly comes from initial buffering time or interruptions and changing of playout speed used in adaptive media playout. In the study,the pause intensity presented as a buffer behavior metric is used in QoE evaluation. The pause intensity is verified through network-simulation-based subjective audio quality assessments. The results show that,with the changing of network bandwidth,the metric pause intensity isclosely related to subjective audio quality assessment scores,with average correlation coefficient of-0. 9. It verifies the effectiveness of the pause intensity as objective quality metric in QoE evaluation of TCP-based audio streaming. Besides,a set of subjective audio quality assessments designed for studying the effect of variation of playout speedon QoE is also presented in this paper,the WSOLA( Wave Similarity OverLap and Add) algorithmis used for audio playout speed altering. The assessments results show that audio quality degrades notably when speed changing factor is greater than 105%. These results can be used as reference for parameters design in adaptive media playout.