Temporary threshold shift and the time pattern of noise exposure
Keywords:acoustic noise, temporary threshold shift, intermittence period, time pattern, on-fraction, sound level, noise bursts, quiet intervals, exchange rate, occupational noise exposure limits, administrative control
AbstractTemporary threshold shift (TTS) is related to the time pattern of noise exposure in a relatively complex fashion. This relationship essentially involves the on-fraction, the period of intermittence and the sound level during noise bursts and quiet intervals. Data from recent studies on the influence of these exposure parameters and more specifically of their mutual interaction is reviewed. Unpublished data is presented on the effect of the interaction between the on-fraction and the period of intermittence on the growth of TTS and also on the effect of the ambient sound level on the recovery from TTS. The predictability of TTS is examined in the context of both laboratory and real life conditions. The implication for the recommended exchange rate between sound level and time in occupational noise exposure limits and for administrative control of exposure is discussed.
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