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ISO 389-4:1994

Acoustics -- Reference zero for the calibration of audiometric equipment -- Part 4: Reference levels for narrow-band masking noise

This standard has been reviewed and then confirmed in 2010 
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Abstract

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.

 

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