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Predicting Speech Quality Under Noise in Wideband Speech Transmission
Citation key predictingspeechqualityundernoiseinwidebandspeechtransmission20090407183513
Author Ramirez, Juan-Pablo and Raake, Alexander and Wältermann, Marcel and Möller, Sebastian
Title of Book Proceedings of the 155th Meeting of the Acoustical Society of America (ASA)/ 5th Forum Acusticum / 9e Congrés Français d'Acoustique / 2nd ASA- European Acoustics Association (EAA) Joint Conference (Acoustics'08 Paris)
Year 2008
ISBN 978-3-9808659-4-4
Location Paris, France
Address Paris, France
Volume 123
Month June/July
Abstract Prediction of users' opinion of speech quality in telecommunication is of a major issue in speech transmission planning. For this purpose, reliable models, such as the E-model (ITU-T Rec. G.107, 2005) were developed for narrow-band (NB) transmission. Meanwhile, telephony using the Internet Protocol (VoIP) has enabled an enlargement of the transmission band, introducing wideband (WB; 50-7000 Hz and beyond) to every day communication. The quality improvement thanks to the bandwidth extension was found to be 29\%, as compared with NB [3]. Consequently, an updated planning model is required to assess quality in WB speech transmission. We performed two listening only tests to study the quality impairment due to signal attenuation, different noise types and level and various codecs. The tests showed that user's quality perception in case of WB was similar to NB for the noisy conditions. However, considerably higher judgments were given to WB than to NB for the low-noised conditions. With increasing noise level, the quality of NB and WB become more and more alike, and quality differences between codecs decrease. Following the lines of thoughts of the E-model, we propose a model assessing the quality impairment in WB speech transmission resulting from noise an or signal attenuation
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