The Effects of Hearing Protectors on Auditory Communications

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Hearing impairment in this context may be approximated as an HTL averaged over 2k, 3k. 4 kHz that is > 40 dB.

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Gasaway D.C. (1979). Personal communication. In most Air Force communication systems the proximity of the microphone to the speaker's lips, alters the frequency balance of speech in a way that insures that HPDs will almost always improve SD. even for hearing impaired individuals.

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Coles R.R.A. , Garinther G.R. , Hodge D.C. , and Rice C.G. (1968). Hazardous Exposure to Impulse Noise. J. Acoust. Soc. Am. Vol. 43, No. 2. 336–343.

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