Psychological and Physiological Acoustics Session 1pPPa: Binaural Hearing and Binaural Techniques I 1pPPa2. A study of spherical harmonics interpolation for HRTF exchange

Today, there exists a growing number of publicly available HRTF datasets, with each set often proposing a unique variation on the spatial discretization measurement grid. These various grids, typically determined by the mechanical system employed, result in datasets which are not directly comparable or exploitable. To alleviate the limitation of incompatible grids and assist in the adaptation of measurements performed on one grid to another, facilitating the inter-exchange of HRTF sets, a fixed radius HRTF interpolation method is proposed. The approach is based on a decomposition of the sound field using spherical harmonics, allowing for a global spatial recomposition. A high spatial density HRTF was used as a test case for evaluating the interpolation method, and a series of measures are employed to quantitatively compare the quality of the interpolation as theoretical laws.