Effect of microphone location in ITE versus BTE hearing aids.
Sound pressure measurements were made at the hearing aid microphones of 20 subjects with their in-the-ear (ITE) hearing aids and a behind-the-ear (BTE) hearing aid to determine the influence of microphone location on hearing aid input. A probe tube microphone was used to measure the difference in dB SPL between the ITE and BTE microphone locations. ITE microphone location resulted in a maximum high frequency advantage of 9.2 dB in the 2500 to 5000 Hz range. However, the frequency location of this maximal advantage varied a great deal between individuals, precluding the use of a standard ITE microphone correction factor for 2cc coupler to functional gain conversions.
Gartrell
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Peel Memorial Hospital, Brampton, Ontario, Canada.
Church
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D000328:Adult; D000669:Amplifiers, Electronic; D012048:Correction of Hearing Impairment; D004423:Ear; D006310:Hearing Aids; D006311:Hearing Disorders / Q000503:physiopathology*; D006320:Hearing Tests; D006801:Humans; D011474:Prosthesis Design