Speaker
Description
Many kinds of sources are impulsive, e.g., shooting ranges, logistic centres, playing fields, and construction sites. Many guidelines require an adjustment (penalty, sanction) to be applied, if noise is impulsive. Penalty is usually a constant value, k [dB], that is added to the measured sound level, LAeq [dB]. Adjusted value, LAeq+k, should describe noise annoyance better than LAeq alone. ISO/PAS 1996-3 (Model A) provides model where the penalty k depends on measured impulse properties: onset rate (Ron) and level difference (DL). However, experimental evidence showed that Model A overestimates subjective annoyance for many types of impulsive sounds. Our purpose was to test alternative models AE and to determine their accuracy using experimental psychoacoustic data. Model B was a modification of Model A. Model C was based on European directive. Model D was based on alternative level difference. Model E was based on statistical sound level variability. All new models BE predicted both subjective annoyance, and annoyance penalty, with higher precision than Model A. Model E is recommended for practical measurements because of its simplicity. The model is applicable for the impulsive noise within 4565 dB LAeq, which is the most usual range occurring in residential yards.