E-Model Modification for Multi-Languages over IP

Abstract

It is well known that non-intrusive speech quality assessment methods are appropriate for real time monitoring of VoIP traffic. However, previous researches has proved that most of the non-intrusive speech quality assessment methods failed to estimate accurate speech quality using different languages. Consequently, intrusive methods are frequently chosen to provide a more accurate measurement, however they cannot be used for real time VoIP traffic monitoring. In this paper, the technique to enhanced simplified version of ITU-T recommendation G.107 E-model with a language impairment parameter was proposed. The method to estimate the function of language impairment by tuning the E-model with an intrusive objective method, PESQ was presented. The results from statistical analysis show that the modified E-model matches well with PESQ scores in eight languages.

QoE Modeling for Voice over IP: Simplified E-model Enhancement Utilizing the Subjective MOS Prediction Model: A Case of G.729 and Thai Users

“…-several of them proposed the improved impairment factors, consisting of Ie and Id and the new jitter impairment factors [49,52,54,56,58] -few of them proposed coefficients or constants of codecs for the simplified E-model [6, 47] However, a few concepts to propose the language impairment factors as in [57,58], which is equivalent to Bias function in this article, are similar but there were no subjective tests in their works. Excluding the original version of this work [2], the most similar works to this research are [14] and [59] which are the previous work before this research article which only focused on the G.711 codec and Skype which uses the SILK codec respectively.…”

“…Giri & Tiwari (2015) [56] The enhanced simplified E-model was presented with the proposed Id as shown in (23), where Id is delay impairment factor, and d is mouth to ear delay (ms). Id = -2.468×10 -14 d 6 + 5.062×10 -11 d 5 -3.903×10 -8 d 4 +1.344×10 -5 d 3 -0.001802d 2 + 0.103d -0.1698 (23) Triyason & Kanthamanon (2015) [57]…”

Deployment of UAV-mounted Access Points for VoWiFi Service with guaranteed QoS

“…At the planning stage, a method for MOS prediction is needed. In VoIP, the most extended method is the E-Model, [26,27], which combines additive impairments factors to measure speech quality 𝑅 factor, ranging from 0 (poor) to 100 (excellent), that can be directly mapped to MOS [28]. As Assem et al [29] put it, the E-Model is ''a repeatable way to assess if a network is prepared to carry a VoIP call or not''.…”