Anechoic measurements (HRTFs)¶
HRTFs measured with a KEMAR dummy head in the anechoic chamber of the TU Berlin [Wierstorf2011]. The HRTFs were measured in the horizontal plane with a resolution of 1° for the three different distances of 0.5m, 1m, 2m, 3m.
Note, that for the distance of 0.5m the used Genelec loudspeaker presents not really a point source. In addition, the HRTFs for 0.5m include reflections of the sound going from the KEMAR head back to the loudspeaker and back to the dummy head.
impulse_responses/qu_kemar_anechoic/QU_KEMAR_anechoic_0_5m.sofa impulse_responses/qu_kemar_anechoic/QU_KEMAR_anechoic_1m.sofa impulse_responses/qu_kemar_anechoic/QU_KEMAR_anechoic_2m.sofa impulse_responses/qu_kemar_anechoic/QU_KEMAR_anechoic_3m.sofa
The measurement comes also with the following headphone compensation filters:
impulse_responses/qu_kemar_anechoic/QU_KEMAR_AKGK271_hcomp.wav impulse_responses/qu_kemar_anechoic/QU_KEMAR_AKGK601_hcomp.wav impulse_responses/qu_kemar_anechoic/QU_KEMAR_SennheiserHD25_hcomp.wav
|[Wierstorf2011]||Wierstorf, H., Geier, M., Raake, A., Spors, S. (2011) “A Free Database of Head-Related Impulse Response Measurements in the Horizontal Plane with Multiple Distances,” 130th AES Convention, eBrief 6|
Three-dimensional HRIR datasets were measured with the Neumann KU100 dummy head. An active 3-way louspeaker (Genelec 8260A) was used as a sound source with a constant distance of approximately 3.25m. Different apparent source positions were realized by rotating the dummy head around two axis using the VariSphear measurement system [Bernschuetz2010]. The impulse responses were captured for different sampling configurations of the source’s position:
- horizontal plane with a resolution of 1°
- two different equidistant spherical Lebedev grids with 2354 and 2702 sampling points
- full sphere equiangular 2° Gauss grid with 16020 sampling points
impulse_responses/fhk_ku100_anechoic/HRIR_CIRC360RM.sofa impulse_responses/fhk_ku100_anechoic/HRIR_CIRC360.sofa impulse_responses/fhk_ku100_anechoic/HRIR_FULL2DEG.sofa
|[Bernschuetz2013]||Bernschütz, B. (2013) “A Spherical Far Field HRIR/HRTF Compilation of the Neumann KU 100,” German Annual Conference on Acoustics (DAGA)|
|[Bernschuetz2010]||Bernschütz, B., Pörschmann, C., Spors, S., and Weinzierl, S. (2010) “Entwurf und Aufbau eines variablen sphärischen Mikrofonarrays für Forschungsanwendungen in Raumakustik und virtual Audio,” German Annual Conference on Acoustics (DAGA)|
The three-dimensional HRTF dataset was measured with a KEMAR (type DB-4004) equipped with a large right ear (type DB-065) and a normal-size left ear (type DB-061). A small two-way loudspeaker (Realistic Optimus Pro 7) was used as a sound source. The HRTFs were measured for a distances of 1.4m. The elevation angle varies from -40° (40° below horizontal plane) to +90° (directly overhead) with a stepsize of 10°. The azimuth angle varies from 0° to 360° with an elevation angle dependent resolution. Files were downloaded from the SOFA database. For documentation see [Gardner1994] which is available here.
The three-dimensional HRTF dataset was measured with a KEMAR dummy head. The HRTFs were measured for ten different distances of 0.2m, 0.25m, 0.3m and 0.4m, 0.5m, ..., 1.0m. The elevation angle varies from -30° to +90° with a stepsize of 15°. The azimuth angle varies from 0° to 360° with a resolution of 5° for elevation angles between ±30°. Above +30° elevation angle the azimuthal resolution is 10° , while for +90° elevation only one measurement per distance was performed. Files were downloaded from the SOFA database. See [Xie2013a] and [Xie2013b] for documentation on the measurements.
impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.2m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.3m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.4m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.5m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.6m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.7m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.8m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.9m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_0.25m.sofa impulse_responses/scut_kemar_anechoic/SCUT_KEMAR_anechoic_1m.sofa
|[Xie2013a]||Xie, B. (2013), “Head-related transfer function and virtual auditory display,” J Ross Publishing|
|[Xie2013b]||Xie, B. et al. (2013), “Report on Research Projects on Head-Related Transfer Functions and Virtual Auditory Displays in China,” Journal of the Audio Engineering Society (61) 5, pages 314-26|