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Etude de la fonction de transfert de l'oreille externe chez le cobaye

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The following observations were made in investigating the transfer function of the outer ear of guinea pigs:

– At 2 kHz and above, the angle of incidence of the acoustic waves at the level of the entrance of the external ear canal is capable of varying the amplification of the acoustic pressure between − 6 and +12 dB. Maximum amplification is attained at an incidence waich is normal to the ear under investigation.


– At 2.5 and 6.5 kHz the outer ear as a whole is capable of amplifying the acoustic pressure level by about 10 dB in the case of normal incidence. At approximately 6.5 kHz the amplification is due to the pinna while at 2.5 kHz it must be attributed to the action of the external ear canal.


Sommaire

L'étude de la fonction de transfert de l'oreille externe chez le cobaye a montré que:

– l'angle d'incidence des ondes sonores au niveau de l'entrée du conduit auditif externe peut faire varier le gain de pression acoustique à cet emplacement de −6 à +12 dB à partir de 2 kHz. L'amplification maximale est atteinte pour une incidence normale à l'oreille étudiée,


– l'oreille externe dans son ensemble, pour une incidence normale, provoque une amplification de niveau de pression acoustique de 10 dB environ à 2,5 kHz et à 6,5 kHz. Le pavillon auditif est responsable de l'amplification dans la zone de 6,5 kHz et le conduit auditif externe de l'amplification dans la zone de 2,5 kHz.


Zusammenfassung

Die Untersuchung der Außenohr-Übertragungsfunktion beim Meerschweinchen hat gezeigt, daß

– je nach dem Schalleinfallswinkel in der Höhe des äußeren Gehörgangs und oberhalb von 2000 Hz Schwankungen des Schalldrucks zwischen −6 dB und 12 dB auftreten. Die maximale Anhebung tritt für senkrechten Einfall des Schalls auf das untersuchte Ohr ein,


– das Außenohr im ganzen bei senkrechtem Einfall eine Anhebung des Schalldruckpegels um 10 dB bei 2,5 kHz und bei 6,5 kHz hervorruft. Für die Anhebung im Bereich um 6,5 kHz ist die Ohrmuschel verantwortlich, für die Anhebung um 2,5 kHz herum dagegen der äußere Gehörgang.
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Document Type: Research Article

Publication date: November 1, 1978

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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