Acoustics. Reference zero for the calibration of audiometric equipment. Reference threshold of hearing under free-field and diffuse-field listening conditions
13.140 - Noise with respect to human beings
EN ISO 389-7
Reemplaza a: BS EN ISO 389-7:2005+A1:2016
This document specifies a reference threshold of hearing for the
calibration of audiometric equipment used under the following
The sound field in the absence of the listener consists of
either a free progressive plane wave (free field) or a diffuse
sound field, as specified in
ISO 8253-2 . In the case of
a free field, the source of sound is directly in front of the
listener (frontal incidence).
The sound signals are pure (sinusoidal) tones in the case of
free-field conditions and one-third-octave bands of (white or
pink) noise in the case of diffuse-field conditions.
The sound pressure level is measured in the absence of the
listener at the position where the centre of the listener’s
head would be.
Listening is binaural.
Correction values for the threshold of hearing under
free-field listening conditions and selected angles of sound
incidence (45° and 90°) deviating from frontal incidence are
ISO 8253-2 for
Other conditions are given in Reference [
The data are given in numerical form for the preferred
frequencies in the one-third-octave series from 20 Hz to 16 000 Hz
inclusive in accordance with ISO 266 and, in addition, for
some intermediate audiometric frequencies up to 18 000 Hz.
The threshold data differ from the audiometric zero specified in
ISO 389-1, ISO 389-2, ISO 389-5 and ISO 389-8, since the latter
refer to monaural listening through earphones with sound pressure
levels referred to specified couplers and ear simulators. Direct
comparison between the data in the parts of ISO 389 mentioned above and in
this document is therefore not appropriate.
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