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Werner, Stephan; Klein, Florian; Müller, Clemens;
Evaluation of spatial audio quality of the synthesis of binaural room impulse responses for new object positions. - In: . - Red Hook, NY : Curran Associates, Inc., (2020), P16-5, convention paper 10305

The aim of auditory augmented reality is to create an auditory illusion combining virtual audio objects and scenarios with the perceived real acoustic surrounding. A suitable system like position-dynamic binaural synthesis is needed to minimize perceptual conflicts with the perceived real world. The needed binaural room impulse responses (BRIRs) have to fit the acoustics of the listening room. One approach to minimize the large number of BRIRs for all source-receiver relations is the synthesis of BRIRs using only one measurement in the listening room. The focus of the paper is the evaluation of the spatial audio quality. In most conditions differences in direct-to-reverberant-energy ratio between a reference and the synthesis is below the just noticeable difference. Furthermore, small differences are found for perceived overall difference, distance, and direction perception. Perceived externalization is comparable to the usage of measured BRIRs. Challenges are detected to synthesize more further away sources from a source position that is more close to the listening positions.



Sloma, Ulrike; Klein, Florian; Werner, Stephan; Pappachan Kannookadan, Tyson;
Synthesis of binaural room impulse responses for different listening positions considering the source directivity. - In: . - Red Hook, NY : Curran Associates, Inc., (2020), P4-3, convention paper 10237

Nowak, Johannes; Fischer, Georg;
Modeling the perception of system errors in spherical microphone array auralizations. - In: Journal of the Audio Engineering Society. - New York, NY : AES, ISSN 0004-7554, Bd. 67 (2019), 12, S. 994-1002

https://doi.org/10.17743/jaes.2019.0051
Neidhardt, Annika; Schneiderwind, Christian;
Physical and perceptual differences of selected approaches to realize an echolocation scenario in room acoustical auralizations. - In: Proceedings of the International Symposium on Room Acoustics : 15 to 17 September 2019 in Amsterdam, Netherlands : ISRA 2019 Amsterdam.. - Aachen : RWTH Aachen University, (2019), S. 237

http://doi.org/10.18154/RWTH-CONV-240146
Schneiderwind, Christian; Neidhardt, Annika;
Perceptual differences of position dependent room acoustics in a small conference room. - In: Proceedings of the International Symposium on Room Acoustics : 15 to 17 September 2019 in Amsterdam, Netherlands : ISRA 2019 Amsterdam.. - Aachen : RWTH Aachen University, (2019), S. 499-506

http://doi.org/10.18154/RWTH-CONV-240138
Remaggi, Luca; Kim, Hansung; Neidhardt, Annika; Hilton, Adrian; Jackson, Philip J. B.;
Perceived quality and spatial impression of room reverberation in VR reproduction from measured images and acoustics. - In: Proceedings of the 23rd International Congress on Acoustics : integrating 4th EAA Euroregio 2019 : 9-13 September 2019 in Aachen, Germany.. - Berlin, Germany : Deutsche Gesellschaft für Akustik, (2019), S. 3361-3368

https://edocs.tib.eu/files/e01mr19/1677542403.pdf
Brandenburg, Karlheinz; Fiedler, Bernhard; Fischer, Georg; Klein, Florian; Neidhardt, Annika; Schneiderwind, Christian; Sloma, Ulrike; Stirnat, Claudia; Werner, Stephan;
Perceptual aspects in spatial audio processing. - In: Proceedings of the 23rd International Congress on Acoustics : integrating 4th EAA Euroregio 2019 : 9-13 September 2019 in Aachen, Germany.. - Berlin, Germany : Deutsche Gesellschaft für Akustik, (2019), S. 3354-3360

Spatial audio processing includes recording, modification and rendering of multichannel audio. In all these fields there is the choice of either a physical representation or of perceptual approaches trying to achieve a target perceived audio quality. Classical microphone techniques on one hand and wave field synthesis, higher order ambisonics or certain methods of binaural rendering for headphone reproduction on the other hand target a good physical representation of sound. As it is known today, especially in the case of sound reproduction a faithful physical recreation of the sound wave forms ("correct signal at the ear drums") is neither necessary nor does it allow a fully authentic or even plausible reproduction of sound. 20 years ago, MPEG-4 standardized different modes for perception based versus physics based reproduction (called "Perceptual approach to modify natural source" and "Acoustic properties for physical based audio rendering"). In spatial rendering today, more and more the perceptual approach is used in state of the art systems. We give some examples of such rendering. The same distinction of physics based versus psychoacoustics (including cognitive effects) based rendering is used today for room simulation or artificial reverb systems. Perceptual aspects are at the heart of audio signal processing today.



https://edocs.tib.eu/files/e01mr19/1677542403.pdf
Neidhardt, Annika;
Data set: BRIRs for position-dynamic binaural synthesis measured in two rooms. - In: Audio for virtual, augmented and mixed realities : proceedings of ICSA 2019 : 5th International Conference on Spatial Audio, September 26th to 28th, 2019, Ilmenau, Germany.. - Ilmenau : ilmedia, (2019), S. 165-169

Binaural room impulse responses were measured with a KEMAR 45BA head-and-torso-simulator. For the first data set, it was placed at different positions located on a line with a length of 2 m in a 25 cm positional resolution and an azimuth resolution of 4˚. Two source positions were considered in the setup, one in front of the line, one at the side. The same arrangement of source and receiver positions was realized in two different rooms, a quite dry listening laboratory and a quite reverberant seminar room. For the second data set, BRIRs and omni-directional RIRs were measured for a translation line with a length of 7.5 m through the given seminar room. The data sets are valuable for realizing, testing and studying dynamic binaural walk-through scenarios in the two different rooms.



https://doi.org/10.22032/dbt.39972
Klein, Florian; Neidhardt, Annika; Seipel, Marius;
Real-time estimation of reverberation time for selection of suitable binaural room impulse responses. - In: Audio for virtual, augmented and mixed realities : proceedings of ICSA 2019 : 5th International Conference on Spatial Audio, September 26th to 28th, 2019, Ilmenau, Germany.. - Ilmenau : ilmedia, (2019), S. 145-150

The aim of auditory augmented reality is to create a highly immersive and plausible auditory illusion combining virtual audio objects and scenarios with the real acoustic surrounding. For this use case it is necessary to estimate the acoustics of the current room. A mismatch between real and simulated acoustics will easily be detected by the listener and will probably lead to In-head localization or an unrealistic acoustic envelopment of the virtual sound sources. This publication investigates State-of-the-Art algorithms for blind reverberation time estimation which are commonly used for speech enhancement algorithms or speech dereverberation and applies them to binaural ear signals. The outcome of these algorithms can be used to select the most appropriate room out of a room database for example. A room database could include pre-measured or simulated binaural room impulse responses which could directly be used to realize a binaural reproduction. First results show promising results combined with low computational effort. Further strategies for enhancing the used method are proposed in order to create a more precise reverberation time estimation.



https://doi.org/10.22032/dbt.39968
Werner, Stephan; Klein, Florian; Götz, Georg;
Investigation on spatial auditory perception using non-uniform spatial distribution of binaural room impulse responses. - In: Audio for virtual, augmented and mixed realities : proceedings of ICSA 2019 : 5th International Conference on Spatial Audio, September 26th to 28th, 2019, Ilmenau, Germany.. - Ilmenau : ilmedia, (2019), S. 137-144

For spatial audio reproduction in the context of virtual and augmented reality, a position-dynamic binaural synthesis can be used to reproduce the ear signals for a moving listener. A set of binaural room impulse responses (BRIRs) is required for each possible position of the listener in the room. The required spatial resolution of the BRIR positions can be estimated by spatial auditory perception thresholds. If the resolution is too low, jumps in perception of direction and distance and coloration effects occur. This contribution presents an evaluation of spatial audio quality using different spatial resolutions of the position of the used BRIRs. The evaluation is performed with a moving listener. The test persons evaluate any abnormalities in the spatial audio quality. The result is a comparison of the quality and the spatial resolution of the various conditions used.



https://doi.org/10.22032/dbt.39967