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immediate downloadReleased: 1999-07-15
BS EN ISO 389-4:1999
Acoustics. Reference zero for the calibration of audiometric equipment Reference levels for narrow-band masking noise
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| Standard number: | BS EN ISO 389-4:1999 |
| Pages: | 16 |
| Released: | 1999-07-15 |
| ISBN: | 0 580 23599 8 |
| Status: | Standard |
DESCRIPTION
BS EN ISO 389-4:1999
This standard BS EN ISO 389-4:1999 Acoustics. Reference zero for the calibration of audiometric equipment is classified in these ICS categories:
- 11.040.01 Medical equipment in general
- 13.140 Noise with respect to human beings
This part of ISO 389 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 as specified in ISO 389:1991 or ISO 389-2, respectively, when the masking earphone is placed on the appropriate acoustic coupler, ear simulator or artificial ear.
Data are given for noise bandwidths of one-third and one-half octaves.
NOTE 1 Some notes on the derivation of the reference levels are given in annex A.