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Aviat Space Environ Med. 1996 Nov;67(11):1034-8.

The effect of a headset leakage on speech intelligibility in helicopter noise.

Author information

1
Royal Norwegian Air Force Institute of Aviation Medicine, Oslo, Norway.

Abstract

INTRODUCTION:

Speech intelligibility tests in recorded helicopter noise were performed on 10 subjects with normal hearing, using a Peltor aviation headset. The subjects acted as their own controls, a pair of sunglasses being the only variable factor.

METHODS:

Noise levels were also measured at the tympanic membrane in one of the test subjects for 7 consecutive fittings of the headset, with and without glasses.

RESULTS:

Results showed a substantial decrease in speech intelligibility when wearing glasses, being most marked for critical signal-to-noise ratios and the most difficult speech material. Changes were statistically highly significant. Average speech intelligibility scores decreased from 68% to 29% for one-syllable words when wearing glasses at critical signal-to-noise ratios. Noise measurements at the tympanic membrane in one subject showed a low-frequency leakage varying between consecutive fittings.

CONCLUSION:

Our findings show that even small leakages due to fitting of the headset or helmet should be avoided, particularly in noisy aircraft with communication-demanding mission profiles.

PMID:
8908340
[Indexed for MEDLINE]

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