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Document ID (ISN)103655
CIS number 04-697
ISBN(s) 2-551-22450-0
Year 2004
Convention or series no. Etudes et Recherches R-361
Author(s) Le R., Laliberté P.
Title Design of a hearing protector that suppresses dominant noise
Original title Conception d'un protecteur auditif à suppression de bruits dominants [in French]
Bibliographic information Institut de recherche en santé et en sécurité du travail du Québec (IRSST), 505 boul. de Maisonneuve Ouest, Montreal (Quebec) H3A 3C2, Canada, 2004. iv, 34p. Illus. 32 ref. Price: CAD 5.35. Downloadable version (PDF format) free of charge.
Internet access [in French]
Abstract Miners generally work with noisy tools and equipment in enclosed areas that are prone to echoing. To protect themselves against ambient noise, they wear conventional hearing protectors such as earmuffs or earplugs. However, these protective accessories mask out all types of signals, including voices and alarms. The aim of this project was to develop a device capable of attenuating the noise from tools and equipment while allowing voice and alarm signals to be heard. Two prototypes of hearing protectors fitted with electronic circuits were developed and tested. Results obtained in the laboratory with a pure sound showed some promise. However, results obtained in practical situations were disappointing. More advanced research will be required for the concept to be of practical use.
Descriptors (primary) hearing protection; mining industry; noise reverberation; noisiness
Descriptors (secondary) acoustic signalling; description of equipment; report; research; sound attenuation; earplugs; earmuffs; background noise
Document type E - Books, reports, proceedings
Country / State or ProvinceCanada
Subject(s) Mines and quarries
Personal protection
Broad subject area(s) Physical hazards
Browse category(ies) Hearing protection
Mining and quarrying