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Globally hearing loss affects about 10% of the population to some degree , At birth 3 per 1000 in developed countries and more than 6 per 1000 in developing countries have hearing problems .
They can't hear when someone around them call them , they can't hear any alarm like fire alarm , text message alarm or ...
Although they can see but they can't watch out everywhere at the same time , this is some kind of equalizer with multiple microphones that show them that one or more sounds from where and how much loud is coming .
Shahid Chamran University
Amin Fahimi Moghadam Mohammad Zareii Qanavati Shahab Tahmasebi