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.
Authors:
Möller, Sebastian; Raake, Alexander; Wältermann, Marcel
Affiliation:
Deutsche Telekom Laboratories, Berlin University of Technology
AES Convention:
124 (May 2008)
Paper Number:
7464
Publication Date:
May 1, 2008
Subject:
Psychoacoustics, Perception, and Listening Tests
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.