Active Noise Reduction (ANR) is a new technology which can reduce the level of aircraft cockpit noise that reaches the pilot's ear while simultaneously improving the signal to noise ratio for voice communications and other information bearing sound signals in the cockpit. A miniature, ear-cup mounted ANR system was tested to determine whether speech intelligibility is better for helicopter pilots using ANR compared to a control condition of ANR turned off. Two signal to noise ratios (S/N), representative of actual cockpit conditions, were used for the ratio of the speech to cockpit noise sound pressure levels. Speech intelligibility was significantly better with ANR compared to no ANR for both S/N conditions. Variability of speech intelligibility among pilots was also significantly less with ANR. When the stock helmet was used with ANR turned off, the average PB Word speech intelligibility score was below the Normally Acceptable level. In comparison, it was above that level with ANR on in both S/N levels.


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    Title :

    Comparison of Speech Intelligibility in Cockpit Noise Using Sph-4 Flight Helmet with and Without Active Noise Reduction


    Contributors:
    J. W. Chan (author) / C. A. Simpson (author)

    Publication date :

    1990


    Size :

    38 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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