Abstract
This paper presents a mathematical model that has been created from the subjective MOS, instead of modifying or improving the existing objective measurement methods (e.g., E-model) for VoIP quality measurement. The proposed model of VoIP quality measurement method is based on native Thai users who communicate to each other using Thai language, which is a tonal language, unlike English and most western languages. The data have been gathered using conversation-opinion tests with 400 and 354 native Thai subjects for two popular codecs, G.711 and G.729, respectively, referring to effects from two major network factors, packet loss and packet delay. This model is called the Thai subjective VoIP quality evaluation model (ThaiVQE). It has been evaluated using two test sets of subjective MOS, from 50 native Thai subjects for G.711 and 64 native Thai subjects for G.729, then the results have been compared with the E-model results. Based on native Thai users, the evaluation result surprisingly shows that ThaiVQE can contribute better accuracy and reliability than the standard E-model with error reduction of over 13 % for G.711 and 28 % for G.729. Therefore, this is an example study for other countries that have their own languages and cultures to create their subjective MOS model.








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Acknowledgments
We thank all the participants/staff/lecturers of KMUTNB, who were involved in the study. We also thank Mr. Nattawut Unwanatham and Mr. Jakkapong Polpong for providing support in the tests with G.711 and G.729, respectively. Thank you the Central Library, KMUTNB, for the area to conduct the tests. We immensely thank Mr. Tuul Triyason, Asst. Prof. Dr. Vajirasak Vanijja and VoIP Laboratory in KMUTT for E-model tool and Mr. Gary Sherriff for editing. Lastly, this paper is dedicated to the old advisor of the 1st author, Dr. Gareth Clayton who sadly passed away in 2010, after giving the important idea to start this research.
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Communicated by M. Zink.
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Daengsi, T., Khitmoh, N. & Wuttidittachotti, P. VoIP quality measurement: subjective VoIP quality estimation model for G.711 and G.729 based on native Thai users. Multimedia Systems 22, 575–586 (2016). https://doi.org/10.1007/s00530-015-0468-3
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DOI: https://doi.org/10.1007/s00530-015-0468-3