00825nam a22000857a 4500245015100000260006900151300001000220505049500230650001400725  aISO 4869-2:1994-Acoustics - Hearing protectors - Part 2: Estimation of effective A-weighted sound pressure levels when hearing protectors are worn  aGeneva :bInternational Organization for Standardization,c1994.  a20 p.  aDescribes three methods (the octave-band, HML and SNR methods) for 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. They are not suitable for use with peak sound pressure level measurements.  aAcoustics