A calibration System for artificial ear in telecommunication

In this paper we propose a novel system for automatic calibration for the artificial ears. Aiming at the artificial ears for telephonometric use, the system is designed in accordance with the international standards. The calibration process involves testing the parameters of the probe microphone and the acoustic characteristics of the artificial ear on open and closed ear condition. The parameters include sound pressure level, acoustic impedance, frequency response sensitivity, etc. On above basis, all processes are controlled by the controlling program. The measured data can be analyzed automatically by this program. As a result, the final results can be obtained. The results show that the parameters measured for 318 ears conform to the recommendation ITU-T P.57. Experiments indicate that this system can accurately realize the artificial ear calibration.