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An equivalent input noise level criterion for hearing aids

By Macrae, Ph.D., John H. Dillon, Ph.D., Harvey National Acoustic Laboratories, Chatswood, NSW, Australia; Journal of Rehabilitation, Vol 33, No 4
(Pages: 355-362) Publication Date: October 1996

This study established a maximum acceptable equivalent input noise level (EINL) for hearing aids. The investigators have discovered that, if the version of the National Acoustic Laboratories (NAL) procedure for selecting the gain and frequency response of hearing aids is used, the EINL criterion can be relaxed for higher gain hearing aids, as a function of the gain of the aid. It is also noted that the relationship between relaxation of the criterion and 2-cc coupler gain is nonlinear, in different amounts, at the various frequencies, so no simple rule can be used to describe the manner in which the criterion can be relaxed. Graphs and tables illustrate the study results. A list of references is included.
Published by: National Rehabilitation Association   (Website:http://www.nationalrehab.org)
Link to text: http://www.vard.org/jour/jourindx.htm
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