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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


Comparison between the discrete ACR scale and an extended continuous scale for the quality assessment of transmitted speech
Zitatschlüssel koester2015a
Autor Köster, Friedemann and Guse, Dennis and Wältermann, Marcel and Möller, Sebastian
Buchtitel Fortschritte der Akustik – DAGA 2015: Plenarvortr. u. Fachbeitr. d. 41. Dtsch. Jahrestg. f. Akust.
Seiten 150–153
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 properties of quality ratings as obtained on a continuous and extended scale are investigated and a functional relation to the ITU-T P.800 Absolute Category Rating (ACR) scale is derived. Therefore, two auditory experiments were conducted in which narrowband and wideband conditions were rated on both the extended continuous and the ACR scale. It turned out that the main benefit of the extended continuous scale is the increased sensitivity, especially for conditions of lower quality. This fact renders the continuous scale attractive for wideband or beyond-wideband experiments, where only a reduced area of the rating scale is available for low-quality conditions (e.g., narrowband conditions).
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