抄録
The electroacoustical characteristics of hearing aid measured in a 2cc coupler are not directly applicable to psychoacoustical real-ear function for prescription of the necessary gain and frequency response of an optimal hearing-aid. In this method loudness measurements were entirely made through a cearing-aid in a listener's ear in account of functional gain. And the most comfortable sensation levels (MCSL) and the uncomfortable sensation level (UCSL), that could not be predicted by the thresholds of severely hearing-impairred individuals, were obtained with 1/3oct. band noise uning the aided audible field measurement. The desired gains of hearing aids were computed prescribed as those that placed in the assumed aided speech spectrum within the listener's dynamic ranbe of hearing in a normal and comfortable pattern.
