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Pinna-related transfer functions and lossless wave equation using finite-difference methods: Validation with
Sebastian T Prepelit Ă1, Javier Gómez Bolaños2, Michele Geronazzo3
1Department of Computer Science, Aalto University, Otaniementie 17, P.O. Box 15500, FI-00076 AALTO, Finland.
The Journal of the Acoustical Society of America
|June 4, 2020
Summary
Wave-based simulations of pinna-related transfer functions (PRTFs) show increasing uncertainty with frequency. However, finite-difference models accurately predict PRTF magnitude up to 8 kHz, validating their use in acoustics.
Area of Science:
- Acoustics
- Computational physics
- Signal processing
Background:
- Head-related transfer functions (HRTFs) simulations face challenges due to uncertainties in measurements and models.
- Validating simulated HRTFs is crucial for their adoption over physical measurements.
Purpose of the Study:
- To validate wave-based simulations of pinna-related transfer functions (PRTFs) for high-frequency acoustic information.
- To assess the accuracy and reliability of finite-difference models in predicting PRTFs.
Main Methods:
- Utilized lossless wave-based simulations with finite-difference models to compute PRTFs.
- Analyzed PRTF measurement repeatability and reproducibility.
- Quantified simulation uncertainties with frequency and grid resolution, employing an asymptotic solution.
Main Results:
- PRTF measurements are repeatable but not always reproducible, impacting reliability.
- PRTF simulations show increasing uncertainty and grid-dependent frequency changes.
- The finite-difference model accurately predicts PRTF magnitude within ±1 dB up to ~8 kHz.
- Spectral distortion averaged ~2 dB up to ~18 kHz.
Conclusions:
- Finite-difference wave-based simulations offer reliable PRTF magnitude prediction within specific frequency ranges.
- Simulation validation addresses critical uncertainties, improving confidence in computational acoustics for HRTF research.
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