Noise Reduction In Hearing Aids
Recently in a local hearing clinic, a client's concerns were discussed. "I'm afraid I won't like them. My brother in law bought two hearing aids, and he keeps them in a drawer in the kitchen." While the number of people dissatisfied with their hearing aids hovers around 50%, the hearing aid industry is hard pressed to decrease the number of returns, and increase the average daily use of each aid. In order to accomplish this, hearing aid manufacturers must answer the most often heard complaint: "It doesn't work well in noise."
Unfortunately, a hearing aid will never be able to accomplish the sifting and sorting that is carried out in the human brain. While a person with normal hearing sits in a restaurant, he can distinguish a conversational speech signal that is as little as three decibels greater than the ambient noise. On the other hand, a person with a 30-decibel sensorineural loss might need the speech signal to be 15 or more decibels greater than the ambient noise.......
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