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2014-03-18
đź—„ In DepositOnce:2014-03-18
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Optimized Spherical Sound Source for Auralization with Arbitrary Source Directivity

Klein, Johannes; Pollow, Martin; Vorländer, Michael

The auralization of measured room impulse responses (RIRs) is traditionally bound to the directivity of the source as well as of the receiver. For the comparability of room acoustical measurements ISO 3382 requires the source and the receiver to be of an omnidirectional directivity. Other source directivity patterns cannot be auralized using RIRs obtained this way. In order to include the spatial information the room impulse response has either to be measured with a sound source of the desired directivity or - assuming the room to be a linear time-invariant system - it can be generated by superposing a set of measurements with a source of known directivity. The advantage of the latter method is that it generates a set of RIRs that can be used to derive the RIR for an arbitrary directivity up to a certain spherical harmonic order in post processing. This article describes a superposition method and a specialized measurement source for the measurement of room impulse responses for an arbitrary source directivity and discusses their capabilities and the limitations. The measurement source was developed using an analytical model. The directivity patterns used for the post processing originate from high-resolution measurements of the actual device. The deviation compared to the analytical model is analyzed regarding the radiation pattern and the achievable synthesis accuracy.
ambisonicsauralizationsound field synthesisspatial audio
Is Part Of
10.14279/depositonce-4103
Published in: Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014, Universitätsverlag der TU Berlin
Published by ISBN 978-3-7983-2704-7
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