Estimating head-related transfer functions of human subjects from pressure-velocity measurements

The Journal of the Acoustical Society of America
Marko HiipakkaVille Pulkki

Abstract

Direct measurements of individual head-related transfer functions (HRTFs) with a probe microphone at the eardrum are unpleasant, risky, and unreliable and therefore have not been widely used. Instead, the HRTFs are commonly measured from the blocked ear canal entrance, which excludes the effects of the individual ear canals and eardrums. This paper presents a method that allows obtaining individually correct magnitude frequency responses of HRTFs at the eardrum from pressure-velocity (PU) measurements at the ear canal entrance with a miniature PU sensor. The HRTFs of 25 test subjects with nine directions of sound incidence were estimated using real anechoic measurements and an energy-based estimation method. To validate the approach, measurements were also conducted with probe microphones near the eardrums as well as at blocked ear canal entrances. Comparisons between the different methods show that the method presented is a valid and reliable technique for obtaining magnitude frequency responses of HRTFs. The HRTF filters designed using the PU measurements are also shown to yield more correct frequency responses at the eardrum than the filters designed using measurements from the blocked ear canal entrance.

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Citations

May 30, 2015·Journal of Occupational and Environmental Hygiene·Hugues NélisseJérémie Voix
Sep 4, 2015·The Journal of the Acoustical Society of America·Huiqun Deng, Jun Yang
Jun 22, 2017·International Journal of Audiology·Florian DenkStephan M A Ernst

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