Abstract
In a standard state-of-the-art measurement the head-related transfer function (HRTF) is obtained in an anechoic room with an elaborate setup involving multiple calibrated loudspeakers. In search for a simplified method that would open up the possibility for an HRTF measurement in a home environment, it has been suggested that this setup could be replaced with one with a single, fixed loudspeaker. In such a setup, the subject samples different directions by moving the head with respect to this loudspeaker, while the head movements are tracked in some way. In this paper, the feasibility of such an approach is studied. To this end, the HRTF is measured in an unmodified (non-anechoic) room by means of a single external speaker and a high resolution head tracking system. The differences between the dynamically obtained HRTF and the standard static HRTF are investigated, and are shown to be mostly due to variable torso reflections.
Highlights
The head-related transfer function (HRTF) is the acoustic filtering that is performed by the torso, the head and the ears on the incoming sound, before it enters the ear canal
We argue that the main differences, though, arise from the fact that the head moves with respect to the torso of the subject, whereas in the standard HRTF measurement the head is static, always in the same position with respect to the torso
The full-sphere HRTF was obtained by rotating the platform (5◦ azimuth resolution) on which the subject was standing, resulting in a very dense, regular grid of 4680 sampled directions, see Fig. 3(a), where the right ear spectral magnitude is shown for f = 8094Hz
Summary
The HRTF is the acoustic filtering that is performed by the torso, the head and the ears on the incoming sound, before it enters the ear canal This filtering is different depending on the direction from where the sound originated, and as such, it carries the acoustic cues from which the listener can deduce the location of the sound source [1]. The impact of a non-individual HRTFs on three-dimensional (3D) audio perception is often studied by considering a generic HRTF, measured on a dummy head, e.g. KEMAR [5] or Neumann KU100.
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