Speech quality evaluation of hands-free telephones during double talk: New evaluation methodologies. - Hans-Wilhelm Gierlich; Frank Kettler; E. Diedrich (EUSIPCO, 1998)

Advanced speech quality testing of modern telecommunication equipment: An overview. - Hans-Wilhelm Gierlich; Frank Kettler (Signal Process., 2006)

A new objective model for wide- and narrowband speech quality prediction in communications including background noise. - Hans-Wilhelm Gierlich; Frank Kettler; Silvia Poschen; Jan Reimes (EUSIPCO, 2008)

Speech Quality Tests of In-Car Communication Systems. - Udo Muesch; Frank Kettler; Marc Lepage (ITG Conference on Speech Communication, 2012)

Scalable Perceptual Based Echo Assessment Method for Aurally Adequate Evaluation of Residual Single Talk Echoes. - Marc Lepage; Frank Kettler; Jan Reimes (IWAENC, 2012)

Orthogonal Audio Analyses for Disturbed Radio Broadcast. - Jan Reimes; Frank Kettler; Udo Muesch; Marc Lepage (ITG Symposium on Speech Communication, 2014)

Design of Double Talk Sequences in Different Languages to Harmonize Third Party Listening Test Results. - Frank Kettler; Silvia Poschen; Radi Serafimov (ITG Symposium on Speech Communication, 2016)

Towards VoIP quality testing with real-life devices and degradations. - Michal Soloducha; Alexander Raake; Frank Kettler; Nils Rohrer; Eva Parotat; Marcel Wältermann; Sven Trevisany; Peter Voigt (ITG Symposium on Speech Communication, 2016)

Testing conversational quality of VoIP with different terminals and degradations. - Michal Soloducha; Alexander Raake; Frank Kettler; Stefan Bleiholder (QoMEX, 2017)

Super-Wideband Extension of a Perceptual Based Echo Assessment Method for Aurally Adequate Evaluation of Residual Single Talk Echoes. - Stefan Bleiholder; Jan Reimes; Frank Kettler (ITG Symposium on Speech Communication, 2018)