Ninth International Conference on Spoken Language Processing

Pittsburgh, PA, USA
September 17-21, 2006

Estimation of the Quality Dimension "Directness/Frequency Content" for the Instrumental Assessment of Speech Quality

Kirstin Scholz (1), Marcel Waltermann (2), Lu Huo (1), Alexander Raake (3), Sebastian Möller (3), Ulrich Heute (1)

(1) Christian-Albrechts-Universitat zu Kiel, Germany; (2) Ruhr-Universitat Bochum, Germany; (3) Technische Universitat Berlin, Germany

The presented work aims at an instrumental method for the assessment of speech-quality of modern telecommunication networks that features two functions: the prediction of a system's overall speechquality as well as the analysis of the overall speech-quality. The introduced method is based on the estimation of quality dimensions, each describing a particular characteristic relevant for the quality of speech signals. For narrowband telephone-speech three relevant dimensions have been identified: "directness/ frequency content" , "continuity", and "noisiness". The estimates of the single dimensions allow for an analysis of speech quality while together forming a model for the overall quality. This paper presents a method for the estimation of the quality dimension "directness/frequency content". The estimator is based on two parameters considered suitable to measure "directness/ frequency content" of a speech signal y(k) that has been transmitted over a telecommunication system. The estimates DF of this dimension show correlations of ρ > 0.93 with the results of corresponding auditory tests.

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Bibliographic reference.  Scholz, Kirstin / Waltermann, Marcel / Huo, Lu / Raake, Alexander / Möller, Sebastian / Heute, Ulrich (2006): "Estimation of the quality dimension "directness/frequency content" for the instrumental assessment of speech quality", In INTERSPEECH-2006, paper 1219-Wed1A3O.6.