The Effectiveness of Hearing Aids in A School Population

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Abstract
The hearing aids used by children attending a Grammar School for the Deaf were acoustically tested with the controls set as they were used for conversational speech. The gain and maximum acoustic output of the aids has been measured and shown to vary in a systematic manner with hearing loss but with considerable individual variation. Free field threshold measurements were made with and without the aids to establish the subjective gain for warble tones. A separate measure of comfortable listening level has been made and compared with the results from the hearing aid measurements. Based on the experimental results an area of hearing available for rehabilitation is arrived at. Concern is expressed at the low level of speech perception that seems possible with aids currently used.

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