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Monday, July 8 • 11:20 - 11:40

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The basic feature of hearing protection devices considered for years is the noise reduction. The noise reduction is main parameter to be taken into account during selection of the proper hearing protection device for a specific noise. This is also valid in the case of impulse noise, which is especially hazardous to hearing. Due to the nature of the impulse noise, measurements of noise reduction of hearing protection devices, are not carried out with the participation of subjects, but with the use of an acoustic test fixture. The numerical calculations may also be used to assess the effectiveness of impulse noise reduction. However, for hearing protection device user it is often necessary to hear important sounds. For safety reasons, it may be especially important to correctly recognise the direction of the auditory danger signal and/or understand speech. The paper presents the aspects of hearing protection and the perception of useful sounds when using hearing protectors. Our studies have shown that depending on the model of hearing protection devices, using level-dependent mode instead of passive mode, may be insignificant or may impair the ability to correctly recognize the direction of warning signal. Individual hearing protection devices are varied, e.g. due to the number of cases of correct indications of the direction from which the auditory danger signal is coming Thus, the choice of a specific model of hearing protection device in addition to noise reduction should also include aspects related to hearing important sounds.

Monday July 8, 2019 11:20 - 11:40 EDT
Outremont 4
  T06 Industr. and occup. Noise & vib., SS01 Hearing protection