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2019 NHCA Annual Conference has ended
Saturday, February 9 • 9:25am - 9:45am
Fundamental Mechanisms of The Objective Occlusion Effect Revisited Using a Finite Element Model of The Outer Ear

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Human outer ear occlusion is commonly associated with the so-called occlusion effect, significantly noticeable at low frequencies when wearing an intra-aural occlusion device. This effect is known as a source of discomfort notably responsible for the non-wearing of hearing aids and earplugs hearing protectors. The cause of the occlusion effect is the propagation of noise from human body internal sources by bone conduction to the cochlea, in particularly via the transmission path through the outer ear. The preponderance of this path depends on the ear canal entrance condition (occluded or not) and on the frequency, for reasons that, in the light of the scientific literature, seem unclear. The occlusion effect is sometimes explained by the fact that the noise radiated into the ear canal by its walls cannot escape from it when it is occluded contrary to the open case. Sometimes, this effect is rather explained by the role of the acoustic impedance of the ear canal seen by its walls which would control the pressure radiated by them. The present study returns in detail on the often acclaimed theories of the occlusion effect in order to revisit the understanding of the fundamental mechanisms of this phenomenon using a finite element model of the outer ear.

Speakers
KC

Kévin Carillo

PhD student, École de Technologie Supérieure
Currently PhD student in acoustic and vibration in the ICAR laboratory at the Ecole de Technologie Superieure (ETS), I am studying the application of vibro-acoustic meta-materials in the field of hearing protection. The main objective is to improve the acoustic comfort (sound attenuation... Read More →

Authors

Saturday February 9, 2019 9:25am - 9:45am
Appaloosa 4

Attendees (16)