Reference number
ISO 389-4:1994
ISO 389-4:1994
© ISO 2025
International Standard
ISO 389-4:1994
Acoustics — Reference zero for the calibration of audiometric equipment — Part 4: Reference levels for narrow-band masking noise
Edition 1
1994-10
1994-10
ISO 389-4:1994
22496
Published
(Edition 1, 1994)
This publication was last reviewed and confirmed in 2021.
Therefore this version remains current.
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.
Life cycle
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Previously
WithdrawnISO 8798:1987
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Now
