Abstract
The existing single numbers for hearing protector noise attenuation are NRR, SNR, HML, and NRRsf. All of these numbers are calculated using a standard ambient noise called pink noise with a total level of 100 dBC. This pink noise does not represent real industrial noise. This pink noise has its peak values in dBA at 2 kHz, which is not usually the case for most real industrial environments. Also, this single number is not associated with statistical distribution and standard deviation. In this paper a trial is presented to calculate the NRRsf using measured industrial noise spectrum. The calculation is carried out for a typical foam-hearing protector. The REAT naive subject results obtained from laboratory measurements of 20 subjects using ANSI 12.6-1997 (B) gives 20 individual attenuations as function of frequency. For each one of the real noise spectra measured in industry, using one subject attenuation, an NRRsf individual number is obtained. The average NRRsf and standard deviation of these attenuation values are presented along with their statistical distribution. These results are discussed and compared to the single classical numbers.
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