Przenoszenie sygnału przez ochronniki słuchu z regulowanym tłumieniem w obecności impulsu akustycznego
Signal transfer through the hearing protectors with the regulation of damping in the presence of the impulse noise

Summary/Abstract: Level-dependent hearing protectors are used ever so more frequently to protect the hearing of persons exposure to impulse noise. A clear advantage coming from the use of this type of hearing protectors, compared to other types, lies in the improvement of the perception of useful signals. However, in spite of such advantages it is during their use one can observe the effect of “blocking” of the sound transfer underneath the hearing protectors (meaning the limitation of the signal transfer through the hearing protectors), occurring directly after the appearance of the acoustic impulse.The article presents an analysis of the acoustic signal transfer underneath the level-dependent hearing protectors in the situation of the acoustic impulse appearance. The analysis aimed at the definition of the time of the “blocking” of noise transfer underneath the hearing protectors effect as well as the decrease of the -sound pressure level resulting from the mentioned effect. Towards that goal a special work stand was prepared, consisting of impulse signal source, a continuous noise and an acoustic test fixture (artificial head). The research had shown the time of the “blocking” effect during the use of the level-dependent hearing protectors to be reaching 1.2 seconds and the decrease in the value of the equivalent sound pressure level, resulting from such effect, to be exceeding even 16 dB.

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