Dr.-Ing. Stephan Werner

Fachgebietsleiter (kommissarisch)
Elektronische Medientechnik

Helmholtzbau, Raum H 3520
+49 3677 69-1653
stephan.werner@tu-ilmenau.de
 

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Literaturliste

Anzahl der Treffer: 62
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Werner, Stephan; Böhme, Martina; Mayenfels, Thomas; Klein, Florian
Variance in measured binaural room transfer functions of individuals. - In: Fortschritte der Akustik, ISBN 978-3-939296-10-2, (2016), S. 83-85

Klein, Florian; Werner, Stephan
Auditory adaptation to non-individual HRTF cues in binaural audio reproduction. - In: Journal of the Audio Engineering Society, ISSN 0004-7554, Bd. 64 (2016), 1/2, S. 45-54

http://dx.doi.org/10.17743/jaes.2015.0092
Sporer, Thomas; Liebetrau, Judith; Werner, Stephan; Kepplinger, Sara; Gabb, Timo; Siedler, Theresa
Localization of audio objects in multichannel reproduction systems. - In: The future of audio entertainment technology - cinema, television and the internet, ISBN 978-1-5108-0050-2, (2015), Paper 8-1, Seite 142-150

Klein, Florian; Werner, Stephan
Auditory adaptation in spatial listening tasks. - In: 138th Audio Engineering Society convention 2015, (2015), S. 521-530

Werner, Stephan; Klein, Florian; Brandenburg, Karlheinz
Influence of spatial complexity and room acoustic disparity on perception of quality features using a binaural synthesis system. - In: 2015 Seventh International Workshop on Quality of Multimedia Experience (QoMEX), ISBN 978-1-4799-8959-1, (2014), insges. 6 S.

This contribution presents investigations on the influence of scene complexity and room acoustic disparity on the perception of different quality features using a binaural headphone system. The quality features "spatial presence" and "listener envelopment" are investigated next to "perceived externalization" and "localization" of an auditory event. The test uses three different rooms with distinct room acoustic characteristics and several scenes with different spatial complexity. The work addresses the question if the quality features can profit by the different audio scenes or not. The results show that spatial presence is influenced by spatial complexity while room acoustic disparity influences listener envelopment. Furthermore, externalization and localization are not affected by spatial complexity regardless of the personalization method used for binaural synthesis.



http://dx.doi.org/10.1109/QoMEX.2015.7148131
Klein, Florian; Werner, Stephan
Kontextabhängige Parameter bei der Qualitätsbeurteilung binauraler Kopfhörersysteme. - In: Fortschritte der Akustik, (2015), S. 1599-1601

Werner, Stephan; Rekitt, Martin; Klein, Florian
Distribution of quadrant errors in auditory localization using a binaural headphone system. - In: Fortschritte der Akustik, (2015), S. 1094-1096

The auditory system of humans enables the perception of spatial audio in real and virtual acoustics using monaural and binaural cues. The perception of direction and distance are two prominent quality features to evaluate the quality of experience of spatial audio systems. Inaccuracies in perception can occur if physical quality elements of the synthesis system are not adequate. In this study a binaural synthesis via headphones is used to re-synthesize single sound sources on several discrete positions on a full circle around the listener. An artificial head (KEMAR) and a two channel spherical microphone setup are used to measure binaural room impulse responses in a real environment. A listening test is performed to measure the number of quadrant errors and perceived externalization of the auditory events in a localization task. The distributions of its frequencies depending on the direction of the re-synthesized sound source are investigated. The results show a continuous relationship between the investigated quality features and the direction of the sound source. Furthermore, an analysis of the relationship between quadrant errors and externalization depending on direction and used binaural room impulse responses are presented.



Werner, Stephan; Klein, Florian
Influence of context dependent quality parameters on the perception of externalization and direction of an auditory event. - In: Spatial audio, ISBN 978-1-63439-759-9, (2015), S. 305-312

Next to an adequate technical realization of an audio reproduction system, the context of usage plays a major role if a perfect auditory illusion with immersion and plausibility is aspired. This contribution presents results from perceptual experiments on context dependent quality parameters. A binaural synthesis of an acoustic scene via a personalized headphone system is used. The investigated quality parameters are influenced by divergence between synthesized scene and listening room, visibility of the scene, and personalization of the system. The plausibility of the perceived auditory scene is described by the test persons with the help of the quality features perceived externalization and direction of the auditory event. The analysis shows that there are significant differences in perceived externalization depending on the occurrence of localization errors but also on divergence or congruence between the listening and synthesized room.



Werner, Stephan; Klein, Florian
Context and plausibility in binaural synthesis. - In: Proceedings of the International Conference on Spatial Audio, ICSA 2014 in Erlangen, Germany, ISBN 978-3-9812830-4-4, (2014), S. 189-192

The development of recording and playback systems is motivated by the goal to create a perfect auditory illusion. In the last decades audio systems like ambisonics, wave field synthesis and binaural headphone reproduction gained in importance. Efforts are made to increase the quality of such systems. Despite the years of research and development, there are still many perceptual effects and psychoacoustical factors which are still unknown or not fully understood. This contribution presents a research project which deals with the systematically analysis of perceptual effects regarding to binaural playback. Based on the results of listening tests a measurement model on the perception of binaural synthesized scenes is developed. For this, a set of quality features needs to be determined and evaluated. These quality features and their weightings can be summarized as plausibility of perception. The plausibility of a binaural auralization does not only depend on physical quality elements of the synthesis system, but also depends significantly on contextual factors. During the project several different auditive scenes are created for evaluation. The contextual factors which influence the quality features are varied. Different rooms for playback and recording are considered as well as variations of the complexity of the acoustical scene, the degree of personalization and the type of visual presentation. Dependencies between these factors are expected and are going to be evaluated. This contribution presents first results of contextual factors influencing quality features.



Werner, Stephan; Liebetrau, Judith
Adjustment of direct-to-reverberant-energy-ratio and the just-noticable-difference. - In: Sixth International Workshop on Quality of Multimedia Experience (QoMEX), 2014, ISBN 978-1-4799-6536-6, (2014), insges. 3 S.

The adjustment of the direct-to-reverberant-energy-ratio (DRR) within a binaural synthesis system is assessed in a listening test. The DRR is changed until the assessors perceive congruence between the synthesized and listening room. The results of the experiment are relevant to apply adaption methods on binaural synthesis to increase plausibility involving context dependent quality parameters like room divergences between the synthesized auditory scene and the listening environment. Furthermore, a discussion is aspired about the relationship between justnoticeable- difference in DRR perception and inter-quartiledistances of the adjusted DRRs.



http://dx.doi.org/10.1109/QoMEX.2014.7138310