EVALUATING THE EFFECTIVENESS OF ACTIVE NOISE REDUCTION IN FLIGHT HELMETS

Authors
  1. Forshaw, S.E.
  2. Rylands, J.M.
  3. Crabtree, R.B.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Army Personnel Research Establishment, Farnborough (England)
Abstract
The study was carried out to investigate laboratory procedures appropriate for measuring the effectiveness of active noise reduction (ANR) devices. The procedures were: ear-canal measurements using an acoustic test fixture (ATF) (an objective procedure) and masked-threshold and loudness-balance tests (psychophysical procedures). In addition, the effect of ANR on signal detection and speech reception was investigated. The results do not clearly permit one procedure to be recommended for the evaluation of ANR systems.
Report Number
DCIEM-88-RR-34 — Research Report
Date of publication
15 Aug 1988
Number of Pages
43
DSTKIM No
88-04314
CANDIS No
57519
Format(s):
Hardcopy;Originator's fiche received by DSIS

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