Volume 5, 2021
|Number of page(s)||14|
|Section||Hearing, Audiology and Psychoacoustics|
|Published online||24 December 2021|
Cross-site investigation on head-related and headphone transfer functions: variabilities in relation to loudness balancing
Institute for Hearing Technology and Acoustics, RWTH Aachen University, 52056 Aachen, Germany
2 Medizinische Physik & Cluster of Excellence Hearing4All, Universität Oldenburg, 26111 Oldenburg, Germany
3 Now at: German Institute of Hearing Aids, Anschützsraϐe 1, 23562 Lübeck, Germany
* Corresponding author: firstname.lastname@example.org
Accepted: 27 November 2021
Headphone transfer function (HpTF) and head-related transfer function (HRTF) measurements are crucial in acoustic science and in binaural virtual acoustic applications. Yet, their measurement set-up, procedure or post-processing is different for nearly every lab, especially for the HRTF measurements. To compare findings between different labs, these measurement deviations have to be quantified alongside with their influence on perceptual aspects. In the scope of a cross-site investigation on loudness balancing between headphone and loudspeaker listening, a set of HpTFs with three different headphones (open, closed, insert earphones) and HRTF close to the eardrum were measured in 14 participants travelling to two different measurement sites at Aachen and Oldenburg. Though set-ups for measuring the HRTF are very different between sites, the gathered HRTFs are quite consistent across them. For the measured HpTFs, across sites the open headphones consistently yield a slightly lower variability in the range from 70 to 5000 Hz than the closed one while the insert earphones exhibit much higher variabilities and a limited range of reproducible results. The difference in loudness balancing across labs could well be predicted by site-specific systematic differences in HpTFs with the exception of 1 kHz narrowband stimulus. This clearly indicates the limits in comparability of HpTFs and loudness balancing across labs and the importance of using headphones with high repeatability like the open ones used in this investigation.
Key words: HpTF / HRTF / Loudness mismatch
© M. Kohnen et al., Published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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