ISO 389-4:1994
Acoustics - Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise

Standard No.

ISO 389-4:1994

Release Date

1994

Published By

International Organization for Standardization (ISO)

Latest

ISO 389-4:1994

Scope

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.

ISO 389-4:1994 history

• 1994 ISO 389-4:1994 Acoustics - Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise