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Master-Vortrag: Investigations on the Translational Displacement within a Higher Order Ambisonics Sound Field Representation

Andreas Behler
Mittwoch, 5. Juni 2019
11:15 Uhr
Hörsaal 4G

With the advance of video recordings in the field of six degrees of freedom, the audio recordings have to adapt. The availability of spherical microphone arrays and a growing research interest make Ambisonics an attractive tool and its possible ability to facilitate soundfield navigation is intriguing.

This thesis explored a way to enable a position change within higher order Ambisonics recording with a single spherical microphone array. For this a parametric decomposition of the recorded sound field was used based on the coding and multidirectional parametrisation of Ambisonic sound scenes method. With it an algorithm was developed with the ability to adjust the loudness and rotate primary signal parts to compute a translational shift. As a prerequisite the algorithm needs distance information of the recorded scene. Furthermore, a way to adapt to differently conditioned signals was developed. It was evaluated along with the proposed algorithm in a realistic surrounding with objective measurements.

For a subjective impression a listening test was conducted with 31 participants using a spherical loudspeaker setup. The objective and subjective tests included a comparison to higher order Ambisonics warping, a zooming method for Ambisonics. The evaluations of both tests returned positive results.

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