According to the data of World Health Organization approximately 5% of the world population have hearing loss at various levels. Most of them are from poor countries and they have no ability to use different accessories, thus only 10% of these people have hearing aids. The existing hearing aids are limited by usage conditions, such as weather and costs.
I designed and built a simple hearing aid, practical and cheap, which can be helpful for light level of hearing loss.
The device is based on Fresnel diffraction equations and uses sound wave diffraction through a cone placed at the entrance to the ear canal to increase the amplitude of sound actually entering the ear canal vs no device. Initial testing has shown that sound amplification was achieved at a level up to 5 times initial level.
Botros Ousama Muallem
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