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Spherical Harmonics Based HRTF Datasets: Implementation and Evaluation for Real-Time Auralization

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Head-related transfer functions (HRTFs) are commonly used to simulate sound events from arbitrary directions in binaural synthesis applications. These HRTFs are usually either measured or simulated with a discrete angular resolution. Using this data directly has several drawbacks, mainly due to the necessary interpolation between these discrete sampling points as well as simplifications in the distance dependence of the near-field HRTF. This paper describes how spherical harmonics (SH) can be used to process HRTF data with the use in real-time capable auralization environments. During the generation of the SH coefficients, the optimal transformation center point is used to achieve a compact transformation. Several strategies are introduced to achieve fast filter reconstruction suitable for real-time auralization.
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Document Type: Research Article

Publication date: July 1, 2014

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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