DocumentCode :
3426057
Title :
Towards a new E-Model impairment factor for linear distortion of narrowband and wideband speech transmission
Author :
Wältermann, Marcel ; Raake, Alexander
Author_Institution :
Deutsche Telekom Labs., Berlin Univ. of Technol., Berlin
fYear :
2008
fDate :
March 31 2008-April 4 2008
Firstpage :
4817
Lastpage :
4820
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 decomposed 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.
Keywords :
speech codecs; speech coding; voice communication; channel filtering; codecs; e-model impairment factor; equipment impairment factors; error reduction; linear distortion; narrowband speech transmission; network planning; transmission systems; user interfaces; wideband speech transmission; Bandwidth; Delay estimation; Filtering; Instruments; Narrowband; Nonlinear distortion; Nonlinear filters; Speech codecs; User interfaces; Wideband; Linear systems; Modeling; Nonlinear distortion; Nonlinear systems; Speech codecs;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Conference_Location :
Las Vegas, NV
ISSN :
1520-6149
Print_ISBN :
978-1-4244-1483-3
Electronic_ISBN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2008.4518735
Filename :
4518735
Link To Document :
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