Modelling the effect of personal hearing protection and communications devices on speech perception in noise


  1. Giguere, C.
  2. Laroche, C.
  3. Vaillancourt, V.
  4. Soli, S.D.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN);Ottawa Univ, Ottawa Ont (CAN) Audiology Research Laboratory
A predictive model of speech intelligibility was developed and validated for use in workplace environments characterized by hazardous noise levels requiring the use of hearing protection devices. The model takes into account the characteristics of the noise field, the signal-to-noise ratio, the attenuation of the device, and the hearing status of the listener. Accurate prediction of speech intelligibility reqired consideration of both the audibility (threshold) and distortion (suprathreshold) components of a hearing loss, as measured by the pure-tone audiogram and the clinical Hearing-In-Noise Test. The mean prediction error over all conditions tested was -0.1% with a standard deviation of 14.6%. The model could be applied in the context of two important applications of direct relevance to the Canadian Forces military environment: (1) the optimal selection of hearing protectors, and (2) the establishment of functionally-based hearing standards for the personnel. The predictive procedures developed in this research could form the basis for a comprehensive hearing protector selection and speech communication assessment system. Additional work is needed to extend the speech perception model to headsets and other communication devices. Speech production with hearing protection devices should also be further studied.

Il y a un résumé en français ici.

hearing protecton;speech communication capability
Report Number
DRDC-TORONTO-CR-2008-178 — Contractor Report
Date of publication
01 Sep 2008
Number of Pages
Electronic Document(PDF)

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