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Transaural Audio - The reproduction of binaural signals over loudspeakers

Authors Kaiser, F.
Year 2011
Thesis Type Audio Engineering project
Topic Spatial Audio
Abstract Binaural audio is a technique to create an aural perception of a three-dimensional sound field for a dedicated listener. The foundation is the knowledge that the ears of a human function as spatial filters. The idea is to reproduce the exact same sound pressure levels at the entrance of the ear canals, which would be prevalent in a real acoustic scene. As a consequence the real perception cannot be distinguished from the virtual one. The challenge is on the one hand the correct measurement or synthesis of the sound pressure at the two ears and on the other hand the correct reproduction of these. Here we regard only the reproduction problem. The use of headphones for reproduction is self evident. However, loudspeakers can be used as well. As the signal reproduced by one loudspeaker arrives at both ears (crosstalk) the question is how to get a signal into one ear only. The idea is to use crosstalk cancellation (CTC) before playback. This project was dedicated to the implementation of known algorithms for CTC for two loudspeakers. The general condition of the problem of CTC for different loudspeaker spacings was investigated and further the performance of different algorithms in different setups was objectively evaluated. Finally, a preliminary listening test was undertaken in order to evaluate the performance of diverse loud- speaker spacings.
Supervisors Noisternig, M., Warusfel, O., Carpantier, T.