Large diverse datasets of human HRTF and ear geometry are now being collected

Evidence

The pinnae and head are not the only aspect of human anatomy that influence the sound received by the two ears, and any component of the body in the sound field contributes to localization abilities. Without having to characterize the relative contributions of all potential obstacles to the sound source, the spectral and temporal changes can be captured by a head-related transfer function (HRTF), a three-dimensional function that codes for the acoustic changes that occur when sounds are presented at different locations with respect to the body. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1534 (#expands, via linked claim)

HRTFs or HRIRs are measured in free-field conditions with the sound source (a loudspeaker) placed in desired positions, for example, 2 metres from a subject at each azimuth and elevation angle of interest (Møller, 1992). An anechoic room can be used for the measurement, but the reflections from walls can also be eliminated by windowing the response to before the arrival of the first reflection. Small microphones are used to capture the response close to the entrance or inside the ear canal. In the former case, the ear canal is typically blocked by the microphone set-up, as illustrated in Figure 12.4a, or it can be kept open. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1410 (#expands, via linked claim)

Categorization

• XREF: connects to: Head-related transfer functions are measured with in-ear microphones in anechoic chambers — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1410; Head-related transfer functions encode all body-induced spectral and temporal sound changes — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1534

Broader Connections

• Head-related transfer functions encode all body-induced spectral and temporal sound changes #expands (0.75) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1534
• Head-related transfer functions are measured with in-ear microphones in anechoic chambers #expands (0.72) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1410