# Anechoic measurements (HRTFs)¶

## Anechoic HRTFs from the KEMAR manikin with different distances¶

Published by members of the Two!Ears consortium

### Digital Object Identifier¶

doi: 10.5281/zenodo.55418

### Description¶

Fig. 59 Setup of the KEMAR in the anechoic chamber of TU Berlin.

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.

### Files¶

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

## Spherical far-field HRTF compilation of the Neumann KU100¶

### License¶

Creative Commons Attribution-ShareAlike 3.0

### Description¶

Fig. 60 Setup of the measurement in the anechoic chamber of FH Köln.

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

For further details, see the FH Köln website or the corresponding paper [Bernschuetz2013].

### Files¶

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)

## MIT HRTF measurements of a KEMAR dummy head¶

### Description¶

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.

### Files¶

impulse_responses/mit_kemar_anechoic/MIT_KEMAR_anechoic_1.7m_large.sofa
impulse_responses/mit_kemar_anechoic/MIT_KEMAR_anechoic_1.7m_normal.sofa

 [Gardner1994] Gardner, B., Martin, K. (1994) “HRTF measurements of a KEMAR dummy-head microphone,” Massachusetts Institute of Technology 280

## Near-field HRTFs from SCUT database of the KEMAR¶

### Description¶

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.

### Files¶

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