Acoustique — Zéro de référence pour l'étalonnage d'équipements audiométriques — Partie 4: Niveaux de référence pour bruit de masque en bande étroite

Specifies reference levels for narrow-band masking noise presented by air conduction from an earphone in pure-tone audiometry. The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure-tone frequencies. Data are given for noise bandwidths of one-third and one-half octaves.