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Variable Voice Likability Affecting Subjective Speech Quality Assessments

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Author: Gallardo, L.F. · Mittag, G. · Moller, S. · Beerends, J.G.
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source:2018 10th International Conference on Quality of Multimedia Experience, QoMEX 2018 10th International Conference on Quality of Multimedia Experience, QoMEX 2018, 29 May 2018 through 1 June 2018
Identifier: 842933
ISBN: 9781538626054
Article number: 8463432
Keywords: POLQA · Seaker likability · Subjective MOS · Subjective speech quality assessment


In telephone conversations, transmitted speech of good to excellent quality is desired for enhanced Quality of Experience and to sustain lasting customer loyalty. Subjective mean opinion scores account for perceived transmitted quality, while instrumental models, such as POLQA, are able to estimate the subjective judgments. To perform subjective or instrumental quality measurements, the International Telecommunication Union recommends to employ two sentences from both, male and female speakers as speech material. In this paper, we have examined whether subjective and instrumental MOS ratings are affected by perceptual voice likability. A listening test has been conducted over 8 degradations with 12 extremely likable and unlikable male and female speakers. Statistically significant effects of gender and of voice likability have been detected on subjective MOS, whereas instrumental MOS was only affected by gender differences. These results can contribute to further improvements needed in the POLQA perceptual modeling, as well as to the selection of speakers for speech quality assessment tests. © 2018 IEEE.