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Listening experiment on the plausibility of acoustic modeling in virtual reality

Authors Enge, K.
Year 2019
Thesis Type Master's thesis
Topic Audio Signal Processing
Abstract Virtual Reality environments are becoming an increasingly important factor in various applications such as architecture, film, computer games, education, medicine, and therapeutic methods. For a long time, VR applications focused primarily on visual impressions. It is undisputed that three-dimensional sound plays an essential role in the credibility of virtual environments, if only for the reason that real space is largely characterized through its sound. The counterpart of VR glasses for the eyes is binaural reproduction via headphones for the ears. The virtualization of real spaces using programs such as Unity or the Unreal Engine opens up new possibilities for psychoacoustic investigations, namely with binaural rendering in virtual spaces. In the present work, the perceived plausibility of different combinations of visual and acoustic virtualizations of several real spaces was investigated. Twenty participants evaluated these combinations with four different degrees of freedom. Among other things, it is shown that fully dynamic third-order Ambisonics models achieve the same plausibility as models with seventh order. Also, static modeling of the entire reverberation by a convolution of a BRIR reverb delivers similar results as long as the di- rect sound is presented dynamically. The plausibility decreases if the acoustics and the visuals provide a strongly different room size impressions.
Supervisors Frank, M., Höldrich, R.