A model of the occlusion effect with bone-conducted stimulation
Artikel i vetenskaplig tidskrift, 2007

An acoustical model using simplified ear anatomy was designed to predict the ear-canal sound pressure occlusion effect in humans. These predictions were compared perceptually as well as with ear-canal sound pressure occlusion effect measurements using a foam earplug with shallow insertion, a foam earplug with deep insertion into the bony part of the ear canal, and a circumaural earmuff. There was good resemblance between model predictions and ear-canal sound pressure measurements. It was also found that all occlusion positions, even deep ear-canal occlusion, produced noticeable occlusion effects. With the bone-conduction transducer at the forehead, the perceived occlusion effect was close to that obtained from ear-canal sound pressure data in the 0.3 to 2 kHz frequency range; when the stimulation was at the mastoid the difference between the perceived and measured ear-canal sound pressure occlusion effect was around 10 dB at frequencies below 1 kHz. Further, the occlusion effect was obtained in two clinical settings: with supra-aural earphones (TDH39), and insert earphones (CIR22). Although both transducers produced occlusion effects, insert earphones produced a greater effect than surpaaural earphones at the low frequencies.

HUMAN MIDDLE-EAR

bone conduction

occlusion effect

acoustic model

EARDRUM

HEARING

ATTENUATION

MOVEMENT

SOUND

BASIC PROPERTIES

PLACEMENT

Författare

Stefan Stenfelt

Universitetssjukhuset i Linkoping

Sabine Reinfeldt

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

International Journal of Audiology

1499-2027 (ISSN) 1708-8186 (eISSN)

Vol. 46 10 595-608

Ämneskategorier

Medicinsk laboratorie- och mätteknik

DOI

10.1080/14992020701545880