This part of IEC 60318 specifies an acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz.
The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, the acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels (RETSPL) for the calibration of audiometers.dition 2.0 2014-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics – Simulators of human head and ear – Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry électroacoustique – Simulateurs de tête et d'oreille humaines – Partie 3: Coupleur acoustique pour l’étalonnage des écouteurs supra-auraux utilisés en audiométrie IEC 60318-3:2014-12(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTE