The area discontinuity between probe and ear canal as a source of power-reflectance measurement-location variability

The Journal of the Acoustical Society of America
James D Lewis

Abstract

This study examined the effect of the area discontinuity between the measurement-probe sound source and ear canal on the plane-wave approximation of power reflectance. The area discontinuity was hypothesized to introduce measurement-location sensitivity to the power reflectance, especially above 5 kHz. Measurements were made in human and artificial ear canals (tubes coupled to an IEC711 ear simulator). In both cases, the power reflectance exhibited a high-frequency notch that decreased in frequency as the residual canal length increased. The area discontinuity between probe and canal was modeled as an inductance in series with the canal's acoustic impedance. To compensate for the effects of the discontinuity, the discontinuity's impedance was subtracted from the measured load impedance of the canal. In the artificial ears, compensation for the estimated area discontinuity removed the high-frequency notch and reduced the position dependence of the power reflectance. Subtracting the estimated discontinuity impedance from the load impedance in the human ears had a minimal effect on the power-reflectance measurement-location variability and magnitude of the high-frequency notch. The area-discontinuity between probe and ear canal is...Continue Reading

References

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Sep 4, 2015·The Journal of the Acoustical Society of America·James D Lewis, Stephen T Neely
Nov 2, 2015·The Journal of the Acoustical Society of America·Daniel M Rasetshwane, Stephen T Neely

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Citations

May 4, 2020·The Journal of the Acoustical Society of America·Kren Monrad NørgaardSøren Laugesen
Sep 2, 2019·The Journal of the Acoustical Society of America·Kren Rahbek NørgaardChristopher A Shera
Jul 1, 2019·The Journal of the Acoustical Society of America·Kren Rahbek NørgaardSøren Laugesen

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