Abstract
The characteristics of frequency response of hearing aids were generally restricted in many cases by microphone in the lower frequency rang and by earphone in the higher. Several kinds of hearing aids having superior characteristic in the lower frequency have appeared in the market recently. This was because of the fact that the microphones have become better in quality and smaller in type.Increment of information as well as possible to give to the people who were hard of hearing through hearing aid the natural sound have been considered by the authors, and a new type of earphone which have much better quality in the higher frequency has been made on trial. It was also ascertained that the earphone have much better characteristics for the ears with nomal hearing.The result obtained by people of hard of hearing on the new earphone was as follows:(1) There was a difference in response obtained between the real and artificial ear (2cc coupler). But among the artificial ears, the coupler was similar to the real ear that earphones with tips attached were determined the characteristics (directect cavity).(2) The new earphone showed a good result at a quiet environment, but was not good in many cases of people of hard of hearing at the noisy place.
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