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Recent activities on speech quality assessment
Zitatschlüssel Soloducha2012
Autor Michal Soloducha and Janto Skowronek and Alexander Raake and Sebastian Möller
Buchtitel ETSI Workshop on Selected Items on Telecommunication Quality Matters
Jahr 2012
Ort Mainz, Germany
Monat November
Verlag European Telecommunications Standards Institute (ETSI)
Zusammenfassung The talk outlines the recently finalized wideband E-model (ITU-T Rec. G.107.1), which allows the successful framework of the narrowband E-model (G.107) to now be applied to HD voice service planning. The talk further discusses the quality-impact due to end-user-terminal processing such as echo cancelation and noise suppression, and respective E-model extensions. Further, the presentation discusses implications of using the NB or WB E-model in speech quality monitoring systems. Here, too, it is of increasing importance to meaningfully include the characteristics of endpoint terminals. Depending on the locations of the probe and quality model, different implications for reporting protocols arise. A short review of existing protocols such as RTCP-XR and TR.104 is provided, and possible additions are discussed. Since benchmarking of services based on purely parametric models such as the E-model is limited, the talk presents some results of an intrusive monitoring campaign on VoIP networks. Here, we investigated the reliability of full-reference (i.e. double-ended) models such as P.862 and P.863 in the light of different network settings and speech material. The second part of the presentation briefly discusses work on audio conferencing service QoE. The two main differentiators between multiparty conferencing and conventional one-to-one calls are discussed, namely the conversational situation, having a group communication via a telecommunication medium, and the environment and communication equipment at each site, with differences leading to asymmetric connections. The presentation summarizes research on the communication complexity and its impact on quality, and on how quality is perceived in case of asymmetric connections. The conferencing-work is part of the recently established ITU-T Question Q.18/12 on tele-meeting and conferencing quality assessment.
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