BS EN ISO 389-4:1999

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Acoustics. Reference zero for the calibration of audiometric equipment – Reference levels for narrow-band masking noise

Published By	Publication Date	Number of Pages
BSI	1999	16

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Categories: 11.040.01 - Medical equipment in general, BSI

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Description

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.

Additional information

Status	Under Review
Title	Acoustics. Reference zero for the calibration of audiometric equipment – Reference levels for narrow-band masking noise
Replaces	BS 7113:1989
Publisher	BSI
Committee	EH/1/1
Pages	16
Publication Date	1999-07-15
ISBN	0 580 23599 8
Standard Number	BS EN ISO 389-4:1999
Identical National Standard Of	EN ISO 389-4:1998, ISO 389-4:1994
Descriptors	Acoustic signals, Audiometry, Bandwidths, Acoustic measurement, Frequencies, Audiofrequencies, Hearing (auditory perception), Audibility, Auditory threshold
Amends	BS ISO 389-4:1994
ICS Codes	11.040.01 - Medical equipment in general

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BS EN ISO 389-4:1999

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