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The Sound Character Space of Spectrally Distorted Telephone Speech and its Impact on Quality
Citation key thesoundcharacterspaceofspectrallydistortedtelephonespeechanditsimpactonquality20090420175135
Author Wältermann, Marcel and Raake, Alexander and Möller, Sebastian
Title of Book Proceedings of the 124th AES Convention
Year 2008
ISBN 978-0937803-62-2
Location Amsterdam, Netherlands
Address Amsterdam, Netherlands
Volume 7464
Month May
Publisher Audio Engineering Society (AES)
Abstract Spectral distortions of speech transmitted over a telephone channel may stem from linear channel filtering, codecs, electro-acoustic properties of end-user terminals, or the acoustic environment at send side. In this contribution, a study is presented which aims at revealing the perceptual space of spectrally distorted telephone speech and establishing a link to the overall quality of the speech. Two dimensions were identified as relevant for explaining the perceived quality: "Indirectness" and "brightness". Whereas "brightness" is related to the center frequency of a transfer function, "indirectness" is correlated with the equivalent rectangular bandwidth and constitutes the dominating factor in the perceptual space in terms of covered variance. The concept of the bandwidth impairment factor which fits into the framework of the so-called E-Model and which is based on these simple parameters for computing the integral quality of spectrally distorted speech could successfully be applied to the given data.
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