ISO 389-4:1994

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

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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

PUBLISH DATE 1994
ISO 389-4:1994

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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