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Measuring the Constants of Ear Simulators

An ear simulator produces an acoustic transfer impedance similar to a real ear. It has a cylindrical volume corresponding to an average adult ear canal and acoustic impedance similar to an average normal eardrum adjacent to a microphone at one end. Devices so constructed are intended to improve the agreement between earphone calibrations and their performance on human ears. A sequence of measurements and analysis is described for establishing that the ear simulator meets acoustic impedance specifications. The results of the measurements serve as a basis for accepting an ear simulator of this type as a standard device for calibrating earphones. Most laboratories have instruments needed to record earphone responses with ear simulators. These can be used to make the necessary impedance measurements.

JAES Volume 25 Issue 12 pp. 1008-1015; December 1977
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