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download between 0-24 hoursReleased: 1994
ISO 389-4:1994
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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| Standard´s number: | ISO 389-4:1994 |
| Pages: | 4 |
| Edition: | 1 |
| Released: | 1994 |
DESCRIPTION
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.