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Binaural rendering of Ambisonic signals by head-related impulse response time alignment and a diffuseness constraint

Publication ID 66014
Abstract Binaural rendering of Ambisonic signals is of great interest in the fields of virtual reality, immersive media, and virtual acoustics. Typically, the spatial order of head-related impulse responses (HRIRs) is considerably higher than the order of the Ambisonic signals. The resulting order reduction of the HRIRs has a detrimental effect on the binaurally rendered signals, and perceptual evaluations indicate limited externalization, localization accuracy, and altered timbre. In this contribution, a binaural renderer, which is computed using a frequency-dependent time alignment of HRIRs followed by a minimization of the squared error subject to a diffuse-field covariance matrix constraint, is presented. The frequency-dependent time alignment retains the interaural time difference (at low frequencies) and results in a HRIR set with lower spatial complexity, while the constrained optimization controls the diffuse-field behavior. Technical evaluations in terms of sound coloration, interaural level differences, diffuse-field response, and interaural coherence, as well as findings from formal listening experiments show a significant improvement of the proposed method compared to state-of-the-art methods.
ISSN ISBN 0001-4966
Volume 143
Journal Nr. 6
Page from - to 3616-3627
Publisher Month 06
Status published
Publication Reference journal article
Year of Publication 2018
Authors Zaunschirm, M., Schörkhuber, C., Höldrich, R.
Keywords Binaural Rendering, Ambisonics