Binaural synthesis of complex, dynamic acoustic scenes requires multiple convolution processes with time-varying head-related transfer functions (HRTFs). To avoid audible artifacts, this requires not only a position-dependent interpolation of HRTFs, but also smooth transitions during filter changes. Existing solutions either use gradual interpolation of filter coefficients or crossfading of filter outputs. This paper proposes a crossfading method that operates in the frequency domain, which enables integration with fast frequency-domain techniques such as overlap&save, uniformly or non-uniformly partitioned convolution. Fading is performed by circular convolution with a frequency-domain window function. A method is proposed to design such windows with only a few non-zero coefficients, resulting in significant complexity reductions compared to existing crossfading techniques. Further substantial efficiency improvements are achieved by integrating the proposed crossfading method into binaural rendering systems.
Author:
Franck, Andreas
Affiliation:
Fraunhofer Institute for Digital Media Technology IDMT, Ilmenau, Germany
AES Conference:
55th International Conference: Spatial Audio (August 2014)
Paper Number:
3-1
Publication Date:
August 26, 2014
Subject:
Spatial Sound Techniques
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