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Recently in a local hearing clinic a clients concerns were discussed Im afraid I wont 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 doesnt 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 The hearing aids task is to acoustically or electronically compensate for both the neurological shortcomings of the hearing impaired person and the wide band increase inherent in any basic amplifier Acoustic compensation can be carried out in a hearing aid microphone Most hearing aids today utilize omnidirectional microphones which pick up sound equally from all directions This may be beneficial and practical in some cases as in the completely in the canal CIC aid The CIC aid uses the natural funneling of the auricle in order to focus sound directly into the instrument Behind-the-ear BTE and full concha in-the-ear ITE aids lose this anatomical feature and may benefit from a directional microphone The purpose of using a directional microphone is to focus its sensitivity toward the front of the listener thereby attenuating or reducing unwanted noise or competition emanating from behind the listener Stach 1998 Microphone directionality can be accomplished by using a
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