TU Berlin

Quality and Usability LabFriedemann Köster

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Dr.-Ing. Friedemann Köster


Research Field
- Quality of Speech and Audio
- Speech- and Signal Processing 

Research Topics
- Multidimensional Diagnostic Analysis of Conversational Speech Quality

Friedemann Köster studied Industrial Engineering at the Christian-Albrechts-University of Kiel. In 2012 he finished his studies and received his Dipl.-Wirtsch.-Ing. degree. Currently he is working as a research assistant at the Quality and Usability Lab of Deutsche Telekom Laboratories, TU-Berlin, where he also works towards a Phd degree in the field of quality.



Speech Communication

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


+49 30 8353 58255
+49 151 14745202


Analyzing Technical Causes and Perceptual Dimensions for Diagnosing the Quality of Transmitted Speech
Zitatschlüssel moeller2013g
Autor Möller, Sebastian and Köster, Friedemann and Skowronek, Janto and Schiffner, Falk
Buchtitel Proc. 4th International Workshop on Perceptual Quality of Systems (PQS 2013)
Seiten 30–35
Jahr 2013
ISBN 978-0470012352
Ort Vienna, Austria
Adresse Vienna, Austria
Monat 2-4 Septemner
Herausgeber Schatz, R. and Hoßfeld, Tobias
Wie herausgegeben full
Organisation FTW
Zusammenfassung We present an analysis of technical causes and corresponding perceptual dimensions of the quality of transmitted speech. Four experts annotated speech files of a common database according to a methodology which is currently being discussed for the future ITU-T Recommendation P.TCA. The annotations are analyzed with respect to their frequency and consistency, and compared to overall quality values as well as perceptual dimension scores, obtained either from subjective experiments or from instrumental models. This way, links can be drawn between technical causes and perceptual dimensions in diagnostic quality assessment of transmitted speech, and the proposed procedures of several upcoming ITU-T Recommendations can be initially validated.
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