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A model of the occlusion effect with bone-conducted stimulation

S. Stenfelt ; Sabine Reinfeldt (Institutionen för signaler och system, Medicinska signaler och system)
International Journal of Audiology (1499-2027). Vol. 46 (2007), 10, p. 595-608.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: occlusion effect, bone conduction, acoustic model, HUMAN MIDDLE-EAR, BASIC PROPERTIES, SOUND, ATTENUATION, PLACEMENT, MOVEMENT, HEARING, EARDRUM

Denna post skapades 2008-11-07. Senast ändrad 2015-07-28.
CPL Pubid: 77419


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Institutioner (Chalmers)

Institutionen för signaler och system, Medicinska signaler och system (2005-2017)


Medicinsk teknik

Chalmers infrastruktur