BS EN ISO 389-4:1999

This standard BS EN ISO 389-4:1999 Acoustics. Reference zero for the calibration of audiometric equipment is classified in these ICS categories:

• 11.040.01 Medical equipment in general
• 13.140 Noise with respect to human beings

This part of ISO 389 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 as specified in ISO 389:1991 or ISO 389-2, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator or artificial ear.

Data are given for noise bandwidths of one-third and one-half octaves.

NOTE 1 Some notes on the derivation of the reference levels are given in annex A.