TEST PROCEDURES FOR THE EVALUATION OF HELMET AND HEADSET MOUNTED ACTIVE NOISE REDUCTION SYSTEMS

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)
Abstract
The report describes laboratory and field procedures appropriate for measuring the effectiveness of active noise reduction (ANR) devices mounted in flight helmets, armoured-vehicle crew helmets, communication headsets, and circumaural hearing protectors. The procedures described are: ear-canal measurements using real subjects or an acoustic test fixture (ATF), masked-threshold and loudness-balance psychophysical procedures, a signal detection procedure, and speech reception procedures using modified rhyme and diagnosic rhyme tests (MRT, DRT) and Speech Transmission Index (STI) measures.
Report Number
DCIEM-89-TR-24 — Technical Report
Date of publication
15 Feb 1989
Number of Pages
22
DSTKIM No
89-03561
CANDIS No
61457
Format(s):
Hardcopy;Originator's fiche received by DSIS

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