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Cross-site investigation on head-related and headphone transfer functions: variabilities in relation to loudness balancing

Authors :
Kohnen Michael
Denk Florian
Llorca-Bofi Josep
Kollmeier Birger
Vorländer Michael
Source :
Acta Acustica, Vol 5, p 58 (2021)
Publication Year :
2021
Publisher :
EDP Sciences, 2021.

Abstract

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.

Details

Language :
English
ISSN :
26814617
Volume :
5
Database :
Directory of Open Access Journals
Journal :
Acta Acustica
Publication Type :
Academic Journal
Accession number :
edsdoj.73d273647164c1c874a312bdcac2af9
Document Type :
article
Full Text :
https://doi.org/10.1051/aacus/2021051