Electroacoustic Performance of Direct-Input Hearing Aids with FM Amplification Systems The purpose of this paper was to provide audiologists practical information regarding the use of direct-input hearing aids with FM systems. The degree to which the electroacoustic characteristics of direct-input hearing aids were preserved when used with two different personal FM systems was evaluated. Although there were limited changes in ... Research Article
Research Article  |   January 01, 1990
Electroacoustic Performance of Direct-Input Hearing Aids with FM Amplification Systems
 
Author Affiliations & Notes
  • Linda M. Thibodeau
    University of Texas, Austin, TX
  • Portions of this work were presented at the Annual Convention of the American Speech-Language-Hearing Association, New Orleans, LA, November 1987 and at the Texas Speech-Language-Hearing Association Meeting, Houston, TX, April 1988.
    Portions of this work were presented at the Annual Convention of the American Speech-Language-Hearing Association, New Orleans, LA, November 1987 and at the Texas Speech-Language-Hearing Association Meeting, Houston, TX, April 1988.×
  • Requests for reprints should be sent to Linda M. Thibodeau, Ph.D., Department of Speech Communication, University of Texas at Austin, Austin, TX 78712-1089.
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Research Articles
Research Article   |   January 01, 1990
Electroacoustic Performance of Direct-Input Hearing Aids with FM Amplification Systems
Language, Speech, and Hearing Services in Schools, January 1990, Vol. 21, 49-56. doi:10.1044/0161-1461.2101.49
History: Received November 16, 1988 , Accepted March 23, 1989
 
Language, Speech, and Hearing Services in Schools, January 1990, Vol. 21, 49-56. doi:10.1044/0161-1461.2101.49
History: Received November 16, 1988; Accepted March 23, 1989

The purpose of this paper was to provide audiologists practical information regarding the use of direct-input hearing aids with FM systems. The degree to which the electroacoustic characteristics of direct-input hearing aids were preserved when used with two different personal FM systems was evaluated. Although there were limited changes in saturation sound pressure level and harmonic distortion, there was an increase in equivalent-input noise and full-on-gain. The frequency response curve of the aid + FM condition relative to the aid alone differed in the high frequencies for the two FM systems. Aids with equivalent gain values had varying amounts of gain when tested with the FM systems set at a constant volume control setting. This variability in the electroacoustic response of a given aid when coupled to a personal FM system suggests that one may not assume characteristics of the hearing aid are maintained when it is used with an FM system.

ACKNOWLEDGMENTS
The provision of hearing aids and FM systems by the various manufacturers is gratefully acknowledged. Katie Gravel and Helen McCaffrey provided valuable assistance in data collection and analysis.
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