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Status : Active
Standard Type : Main
Document No : ISO 389-4:1994
Document Year : 1994
Pages : 4
Edition : 1
Section Volume : Acoustics (ISO/TC 43.)
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.