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Interaural Level Difference Optimization of Binaural Ambisonic Rendering

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JournalApplied Sciences
DateAccepted/In press - 15 Mar 2019
DatePublished (current) - 23 Mar 2019
Issue number6
Volume9
Original languageEnglish

Abstract

Ambisonics is a spatial audio technique appropriate for dynamic binaural rendering due to its sound field rotation and transformation capabilities, which has made it popular for virtual reality applications. An issue with low-order Ambisonics is that interaural level differences (ILDs) are often reproduced with lower values when compared to head-related impulse responses (HRIRs),
which reduces lateralization and spaciousness. This paper introduces a method of Ambisonic ILD Optimization (AIO), a pre-processing technique to bring the ILDs produced by virtual loudspeaker binaural Ambisonic rendering closer to those of HRIRs. AIO is evaluated objectively for Ambisonic orders up to fifth order versus a reference dataset of HRIRs for all locations on the sphere via estimated
ILD and spectral difference, and perceptually through listening tests using both simple and complex scenes. Results conclude AIO produces an overall improvement for all tested orders of Ambisonics, though the benefits are greatest at first and second order.

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© 2019 by the authors

    Research areas

  • Ambisonics;, binaural Ambisonic rendering;, interaural level difference, virtual loudspeaker;, binaural synthesis

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