Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2005.10b
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- Pages.551-553
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- 2005
Circuit design for wireless hearing aid telecoil electromagnetic noise cancellation
무선보청기 텔레코일의 전자계 잡음 소거를 위한 회로 설계
Abstract
When a hearing aid' s user is listening through telephone or cellular phone, he/she usually suffers from severe electrical magnetic interference noise. It is because hearing aids amplify voice signal as well as background noise. A telecoil, an induction coil, is a possible solution for the problem. Because a telecoil has the characteristic of high pass filter, it has some problem of resulting increased high frequency noise. For solving this problem, we can use a capacitor connected with the telecoil in parallel. According to capacitance, receiving signal quality may change. In this paper, proper capacitor values for the best sound quality are investigated by experimental work.