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Bachelor-Vortrag: Comparison of Sound Field Translation Methods

Georg Krekel
Mittwoch, 24. November 2021
14:00 Uhr
virtueller Konferenzraum

Higher Order Ambisonics (HOA) signals can be used to allow directional playback of sound signals, where the listener can rotate their head around all three rotational axis. HOA signals can also be adapted to allow translational  movement of the listener using sound field translation. Sound field translation is the process of evaluating a sound field at a different position than it was recorded at. At the IKS (Institute of Communication Systems, RWTH Aachen) multiple algorithms have been proposed, that try to achieve psychoacoustically plausible sound field translation, however the inner workings of these algorithms are not well understood.

This thesis compares different aspects of two algorithms, Adaptive Beamforming and Adaptive Spacewarping, mainly by deriving analytical expressions that allow deeper understanding of the underlying effects. The algorithms were split into two main stages, the translation stage and the filtering stage. There are significant differences between ASW and ABF. in the translation stage ASW is distorted compared to ABF. However, differences shrink with the order of the HOA input signal. The filtering stage for ABF and ASW is very similar, especially if oracle information of covariance matrices is not available.