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


P.TCA exemplary listening material processing and validation
Zitatschlüssel koester2013b
Autor Köster, Friedemann and Möller, Sebastian and Skowronek, Janto and Schiffner, Falk
Jahr 2013
Adresse Geneva
Nummer COM 12 – C 105 – E
Monat 3-12 December
Wie herausgegeben full
Institution International Telecommunication Union
Zusammenfassung In this contribution, we present the processing and the validation of exemplary listing material for the degradations covered by the P.TCA methodology. The processing was conducted with the help of two speech and signal processing tools. Seven experts subsequently annotated the speech files of a created database following the processing chain according to the draft instructions. The annotations are analysed with respect to their frequency and accuracy of the created exemplary listening material. The contribution is meant as an initial step, to show that the processing of exemplary listening material for the P.TCA methodology is generally possible and it allows further findings about the improvement of the P.TCA methodology.
Typ der Publikation ITU-T Contribution
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