Archives of Acoustics, 32, 2, pp. 287-292, 2007
Laboratory objective method for noise reduction measurements of ear-muffs
The aim of the project was to work out a laboratory method for measurements of noise reduction of ear-muffs whose results are in better agreement with real-world performance than the results of sound attenuation measurements according to PN-EN 24869-1. The paper presents the methodology for noise reduction measurements of ear-muffs with the use of a four-channel sound analyzer. The laboratory test site met the requirements of PN-EN 24869-1. The objective tests were carried on with sixteen persons. The microphones were placed at the subject's ear under the ear-muffs' cups and outside the cups. The measurements were carried on four samples of ten models of ear-muffs. The comparison of noise reduction measurements data with the sound attenuation measured according to PN-EN 24869-1 is discussed.
Keywords: hearing protectors, ear-muffs, noise reduction
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