Abstract
A simulated in situ measurement system for hearing aids was developed. The system consists of a head and torso simulator (SAMRAI) with a simplified ear simulator and an equipment for digital signal processing (SPIRIT). SAMRAI was constructed on the basis of the average dimensions of Japanese male adults. The ear simulator, newly developed for practical use, is terminated in a simple resistance of 320 cgs acoustic ohms. The measurement result on SAMRAI with the ear simulator shows good agreement with the real ear data. And several measurement results using this system are discussed. Finally we show a method of measuring vent response using an ear simulator, which has a termination impedance not similar to human eardrum impedance.
