Abstract
As a means of calibrating high‐frequency hearing tests without the problems inherent in the use of pressure‐calibrated headphone systems [M. R. Stinson, J. Acoust. Soc. Am. Suppl. 1 87, S75 (1987)], an intensity‐calibrated method of measuring hearing thresholds based on the two‐microphone technique has been developed [W. J. Murphy, A. Tubis, and G. R. Long, J. Acoust. Soc. Am. Suppl. 1 87, S75 (1987)]. The two‐microphone probe is used to estimate the acoustic impedance and the power reflection coefficient of the middle and inner ear system as well as to calibrate psychoacoustic measurements. Various cheeks on the reliability of the long‐term phase calibration are discussed. A computer simulation of the ear canal acoustics is used to determine an appropriate downstream distance of the probe tips from the insert‐earmold sound port. Typical data are given for both objective and psychoacoustic measures obtained with the two‐microphone system. [Work supported by a grant from the Deafness Research Foundation.]
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