Performance of Individual Hearing Aids Utilizing Microphone and Induction Coil Input Physical measurements of gain, maximum power output, frequency response, and harmonic distortion were made on each of two body-type hearing aids on both the microphone and induction coil settings. In addition, we investigated speech intelligibility through each aid, for both acoustic and magnetic input, using 32 normal-hearing subjects. Our findings ... Research Article
Research Article  |   June 01, 1971
Performance of Individual Hearing Aids Utilizing Microphone and Induction Coil Input
 
Author Affiliations & Notes
  • Richard J. Sung
    Veterans Administration Hospital, Kansas City, Kansas
  • William R. Hodgson
    University of Kansas Medical Center, Kansas City, Kansas
Article Information
Research Articles
Research Article   |   June 01, 1971
Performance of Individual Hearing Aids Utilizing Microphone and Induction Coil Input
Journal of Speech, Language, and Hearing Research, June 1971, Vol. 14, 365-371. doi:10.1044/jshr.1402.365
History: Received November 21, 1969
 
Journal of Speech, Language, and Hearing Research, June 1971, Vol. 14, 365-371. doi:10.1044/jshr.1402.365
History: Received November 21, 1969

Physical measurements of gain, maximum power output, frequency response, and harmonic distortion were made on each of two body-type hearing aids on both the microphone and induction coil settings. In addition, we investigated speech intelligibility through each aid, for both acoustic and magnetic input, using 32 normal-hearing subjects. Our findings indicated that different hearing aids provide different sensitivity for loop induction. For a given hearing aid, physical characteristics varied between the microphone and the telephone coil settings. The intelligibility of speech produced by a given mode of signal input, either microphone or telephone coil, was dependent on physical characteristics of the hearing aid. The usable high-frequency response and the configuration of the response curve in the region of 1500 to 3000 Hz appeared to be associated with the intelligibility of monosyllabic words.

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