System and method for measuring acoustic reflectance

A - Human Necessities – 61 – B

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A61B 5/12 (2006.01) A61B 8/00 (2006.01) G01H 15/00 (2006.01)

Patent

CA 2239583

A system for testing the auditory response of the human ear by measuring the linear and nonlinear power-based responses thereof uses a small probe assembly (50) containing a sound source (24, 52, 54) and microphone (30, 52, 56) inserted into the ear. The linear responses, or transfer functions, include reflectance, admittance and impedance. A calibration procedure is based upon measured pressure responses in one or more calibration waveguides (60), and upon a model of the transfer function of each of the calibration waveguides. The nonlinear responses are established by measuring the above transfer functions at different levels of the acoustic stimulus. By delivering changes in static pressure applied to the ear via an additional probe tube (68, 70) in the probe assembly (50), the system is able to measure the dependence on static pressure of any of these linear and nonlinear power- based functions.

Un système d'étude de la réponse auditive de l'oreille humaine par la mesure de ses réponses linéaires et non linéaires sur la base d'une alimentaiton électrique utilise un petit ensemble sonde (50), contenant une source sonore (24, 52, 54) et un microphone (30, 52, 56), qui est introduit dans l'oreille. Les réponses linéaires, ou fonctions de transfert, comprennent la réflectance, l'admittance et l'impédance. Une procédure d'étalonnage est fondée sur les réponses mesurées à la pression, dans un ou plusieurs guides d'ondes d'étalonnage (60), et sur un modèle de la fonction de transfert de chacun des guides d'ondes d'étalonnage. On établit les réponses non linéaires en mesurant les fonctions de transfert précitées pour différents niveaux du stimulus acoustique. En effectuant des variations de la pression statique appliquée à l'oreille au moyen d'un tube de sonde supplémentaire (68, 70) dans l'ensemble sonde (50), le système est capable de mesurer la dépendance de n'importe laquelle de ces fonctions linéaires et non linéaires, ayant pour base une alimentation électrique.

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