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Variable-Perspective Rendering of Virtual Acoustic Environments based on Distributed First-Order Room Impulse Responses

Authors Müller, K.
Year 2019
Thesis Type Master's thesis
Topic Spatial Audio
Abstract The Ambisonic spatial decomposition method (ASDM) allows to map first-order room impulse responses (FO RIRs) to higher Ambisonics orders, enhancing a directionally compact and spatially consistent auditory imaging of direct sound and reverberation. Based on this method, the present thesis describes an efficient method for position-dependent interpolation of ASDM-upmixed Ambisonics room impulse responses (ARIRs), measured at multiple perspectives in the room. Linked with an user-interactive ARIR rotation, this approach empowers the listener to move within a virtual acoustic environment with six degrees of freedom (6DoF). In particular, the proposed approach parametrically decomposes the FO RIRs to detect matching early RIR segments of commonly localized source objects from several perspectives. Finally, position-dependent interpolation of matching early RIR segments and linear combination of extrapolated residual RIR parts accomplishes a variable-perspective ARIR for convolution-based Ambisonics audio rendering. To verify the practical usability and relevance of the proposed method, different configurations are evaluated in a listening experiment and compared to a reference.
Supervisors Zotter, F., Höldrich, R.