TU Berlin

Quality and Usability LabStefan Uhrig

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Stefan Uhrig

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Biography

Stefan received M.Sc. degrees in Psychology at the University of Giessen (2013) and in Human Factors at the Technical University of Berlin (2016). Since February 2017, he is working as a scholarship PhD student at the Quality and Usability Lab.

Research Topics

► Perceived quality (with focus on transmitted speech)

► Psychophysiology (electroencephalography, EEG)

► Data analysis and statistics

Current Project

Physiological correlates of perceived quality, presence and immersion in virtual environments (part of joint PhD program between TU Berlin, Germany, and NTNU Trondheim, Norway)

Contact

Address

Quality and Usability Lab
Deutsche Telekom Laboratories
Technische Universität Berlin
Ernst-Reuter-Platz 7
D-10587 Berlin, Germany

Publications

Dissociating Perceptual Quality Dimensions of Transmitted Speech Using Electroencephalography
Citation key uhrig2018a
Author Uhrig, Stefan and Möller, Sebastian and Voigt-Antons, Jan-Niklas
Title of Book 2018 Tenth International Conference on Quality of Multimedia Experience (QoMEX)
Pages 1–3
Year 2018
ISBN 978-1-5386-2605-4
DOI 10.1109/QoMEX.2018.8463371
Location Cagliari, Italy
Address Piscataway, NJ, USA
Month may
Note Online
Publisher IEEE
Series QoMEX
How Published Fullpaper
Abstract The present study utilized electroencephalography (EEG) to explore the neuro-electrical correlates of perceptual dimensions underlying speech quality. Specific focus lay on the P300 event-related brain potential (ERP) component to provide indication for internal processes related to attention and stimulus categorization. A high-quality (HQ) recording of a spoken word was impaired on each of three perceptual dimensions at a time, “discontinuity” (F), “noisiness” (N) and “coloration” (C), with F being realized through random erasure of distinct frames in the speech signal parts of the audio file. In an active three-stimulus oddball task, repeated presentations of the HQ stimulus led to the formation of a sensory/perceptual HQ reference, which was interrupted by infrequent occurrences of degraded “oddball” stimuli (F, N, C). Initial analysis of the obtained subjective and electrophysiological data suggested the following conclusions: 1) Participants perceived the three degraded stimuli as clearly impaired, but equal in terms of degradation intensity. Thus, variations in neural responses were assumed to reflect changes in the perceptual dimension along which the speech degradation had been induced. 2) Timing of the evoked P300 corresponded with temporal differences in the impairments, implying a later onset for “discretely” (F) compared to “continuously” (N, C) degraded stimuli after being categorized as task-irrelevant. Hence, P300 peak latency might prove useful to dissociate both classes of speech quality impairments on a neural level of analysis.
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