000			01238nam a22001097a 4500
999			_c16260 _d16260
245			_aISO 11904-2:2004-Acoustics - Determination of sound immission from sound sources placed close to the ear - Part 2: Technique using a manikin
260			_aGeneva : _bInternational Organization for Standardization, _c2004.
300			_a24 p.
505			_aISO 11904-2:2004 specifies basic framework measurement methods for sound immission from sound sources placed close to the ear. These measurements are carried out with a manikin, equipped with ear simulators including microphones. The measured values are subsequently converted into corresponding free-field or diffuse-field levels. The results are given as free-field related or diffuse-field related equivalent continuous A-weighted sound pressure levels. The technique is denoted the manikin technique. ISO 11904-2:2004 is applicable to exposure to sound from sources close to the ear, for example during equipment tests or at the workplace to sound from earphones or hearing protectors with audiocommunication facilities. ISO 11904-2:2004 is applicable in the frequency range from 20 Hz to 10 kHz. For frequencies above 10 kHz, ISO 11904-1 can be used.
650			_aAcoustics
942			_cST