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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

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Kehtiv alates 22.09.1994
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Kuupäev
Tüüp
Nimetus
22.09.1994
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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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EVS-EN ISO 389-4:1999

Acoustics - Reference zero for the calibration of audiometric equipment - Part 4: Reference levels for narrow-band masking noise
Uusim versioon Kehtiv alates 01.01.2000