DIN EN ISO 4869-2-1995 声学.听力保护器.第2部分:当听力保护器磨损时有效A-重声压级的评估 (ISO 4869-2:1994); 德文版本 EN ISO 4869-2:1995
Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn (ISO 4869-2:1994); German version EN ISO 4869-2:1995
The document describes three methods (the octave-band, HML and SNR methods) of estimating the A-weighted sound pressure levels effective when hearing protectors are worn. The methods are applicable to either the sound pressure level or the equivalent continuous sound pressure level of the noise. Although primarily intended for steady noise exposures, the methods are also applicable to noises containing impulsive components. These methods are not suitable for use with peak sound pressure level measurements.