Database of Spherical Harmonic Representations of Sound Source Directivities

This is a database of complete spherical harmonic representations of the directivities of sound sources. The data are provided as impulse responses that represent the directivity of the given source in a given discrete direction. The Matlab script compute_spherical_harmonics_model.m demonstrates how a spherical harmonic representation can be computed from the data. We do not provide spherical harmonic coefficients directly because of the multitude of definitions of spherical harmonics and also of the Discrete Fourier transform. We rather ask you to select the combination of definitions you would like to use and compute the spherical harmonic coefficients on demand. You may want to add re-sampling or zero padding and the like to make the data compatible with your intended application.

As of now, all spherical harmonic representations are based on previously published data. Please do not forget to site this repository as well as the original repositories when using the data. References to the original sources are provided with each dataset. All data are bandlimited to the spherical harmonic order N that is specified in the corresponding file name. The conversion between raw data and spherical harmonic coefficients is therefore essentially lossless.