Abstract
The objective of the present work is to make accurate impedance estimates at the eardrum Ztm (ω). This is done by measuring the thevenin parameters of an earphone using a four‐cavity calibration method [J. B. Allen, “Measurement of eardrum acoustic impedance,” in Peripheral Auditory Mechanisms, edited by J. B. Allen et al. (1985)] for frequencies up to 15 kHz. The calibrated earphone is then used to measure the ear canal impedance Ze (ω) near the ear canal entrance. To transform Ze to Ztm, the ear canal cavity has been modeled. The following effects were accounted for by the model: (a) the jump in area from the earphone calibration cavity to that of the ear canal, (b) the distance to the eardrum, (c) variations in cross‐sectional ear canal area, and (d) effects due to ear canal wall impedances. It is desirable that parameters of the ear canal be derivable from Ze. Preliminary results isolating each of these effects first in tubes and then in real ear canals are presented.
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