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TU Berlin

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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


Diagnosing the quality of transmitted speech with expert and naive listeners
Zitatschlüssel koester2015d
Autor Köster, Friedemann and Möller, Sebastian
Buchtitel Fortschritte der Akustik – DAGA 2015: Plenarvortr. u. Fachbeitr. d. 41. Dtsch. Jahrestg. f. Akust.
Seiten 143–146
Jahr 2015
ISBN 978-3-939296-08-9
Ort Nürnberg, DE
Adresse Berlin
Monat mar
Notiz another medium
Verlag DEGA
Wie herausgegeben full
Zusammenfassung In this contribution the frequency and consistency of expert and naive listeners in a technical causes annotation experiment are compared. For this, two experiments with experts and naifs following the guidelines of the currently discussed ITU-Recommendation P.TCA were conducted. In these experiments, participants are asked to annotate speech files with respect to their possible degradation by choosing from a list of 47 degradations, separated in 9 impairment types. Originally intended for experts, the P.TCA procedure was expanded with exemplary listening material for naive annotators to lift them on an expert level. The results show that experts annotate more consistent than naifs and that the additional provided examples are not sufficient for an equal analysis. Furthermore, findings about possible improvement of the P.TCA methodology are presented.
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