It is well known that a frequency response via induction coil of a hearing aid is different from a frequency response via microphone (low tone part is especially reduced). Because of this phenomenon, meny hearing aid users dislike “via inductive coil sound”.
Auther developed a hi-definition induction loop system to obtain a frequency response via microphone. Further, an improved telephone and a small sized induction loop system (apprication systems) is tested by hearing aid (equipped with an inductive coil) users (average 80-105dB HL).
The results obtained were as follows;
1) A hi-definition loop system was used effectively for all kinds of hearing aid (equipped with an inductive coil) users.
2) It was proved that “via inductive coil sound” became comfortable and clear by using a hi-definition induction loop system.
3) For more comfortable listening, a hi-definition induction loop system with a trimmer in a magnetic field is very effective.
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