HRTF definition normalizes ear responses by the head’s absence

Evidence

The head-related transfer function HHRTF is defined by the response to a sound source at a specified position in the ear canal Hec normalized to the response Hff in the middle position of the head when the head is absent: 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). — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1409

Categorization

• DEFINE: Mathematical definition of the transfer function, essential for anyone building spatial audio systems.