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Towards a New E-Model Impairment Factor for Linear Distortion of Narrowband and Wideband Speech Transmission
Citation key towardsanewEmodelimpairmentfactorforlineardistortionofnarrowbandandwidebandspeechtransmission20090421142635
Author Wältermann, Marcel and Raake, Alexander
Title of Book Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2008)
Pages 4817–4820
Year 2008
ISBN 978-1-4244-1484-9
Location Las Vegas, NV, United States
Month March-April
Abstract The E-Model, a tool for network planning recommended by the ITU-T, suffers from the lack of predicting linear distortions as they may occur from channel filtering, codecs, and user interfaces. In order to face this deficiency, a new impairment factor is introduced in this paper which is estimated on the basis of two simple parameters from the linear portion of a system. Therewith, conventional Equipment Impairment Factors of narrowband and wideband speech codecs are de- composed into a linear and a residual part, allowing to quantify both magnitudes separately on the so-called R-scale. By extending the concept of distortion classes in the E-Model, the proposed scheme provides a plausible picture of the linear effect of transmission systems. The advantage of wideband causing a 36\% quality gain is well reflected. Further, the decomposition leads to a reduction of error when impairment factors are added on the R-scale. Examples for instrumentally estimating the residual impairment are given.
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