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On the removal of the open earcanal high-pass filter effect due to its occlusion: A bone-conduction occlusion effect theory

Authors :
Franck Sgard
Kévin Carillo
Olivier Doutres
Source :
Acta Acustica, Vol 5, p 36 (2021)
Publication Year :
2021
Publisher :
EDP Sciences, 2021.

Abstract

The occlusion effect is commonly experienced by in-ear device wearers as an increased loudness sensation of bone-conducted low frequency sounds. A widespread theory proposed by Tonndorf and based on a simplified electro-acoustic model describes the phenomenon as the removal of the open earcanal high-pass filter effect due to a perfect or partial occlusion. However, this filter has not been clearly defined and several ambiguities remain. Revisiting the model, a second order high-pass filter effect for the volume velocity transferred between the earcanal wall and the eardrum is highlighted. This filter remains for partial occlusion but vanishes for perfect occlusion. In the latter case, the volume velocity transferred from the earcanal cavity to the middle ear through the eardrum drastically increases, which explains the predominance of the occluded outer ear pathway on the hearing by bone-conduction at low frequencies.

Details

ISSN :
26814617
Volume :
5
Database :
OpenAIRE
Journal :
Acta Acustica
Accession number :
edsair.doi.dedup.....0c5a7fdd423a39c7004164b6ceda0de8
Full Text :
https://doi.org/10.1051/aacus/2021029