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About This Item

 

Full Description

This document specifies a reference threshold of hearing for the calibration of audiometric equipment used under the following conditions.

a) 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).

b) 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.

c) 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.

d) Listening is binaural.

Cross References:
ISO 389-1
ISO 266
ISO 389-2
ISO 8253-1
ISO 389-8
ISO 8253-2
IEC 60645-4
IEC 60645-1
ISO 389-5
BS ISO 226:2003


All current amendments available at time of purchase are included with the purchase of this document.
 

Document History

  1. BS EN ISO 389-7:2019

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    Acoustics. Reference zero for the calibration of audiometric equipment

    • Most Recent
  2. BS EN ISO 389-7:2005+A1:2016


    Acoustics. Reference zero for the calibration of audiometric equipment

    • Historical Version
  3. BS EN ISO 389-7:2005


    Acoustics. Reference zero for the calibration of audiometric equipment. Reference threshold of hearing under free-field and diffuse-field listening conditions

    • Historical Version
  4. BS EN ISO 389-7:1998


    Acoustics. Reference zero for the calibration of audiometric equipment. Reference threshold of hearing under free-field and diffuse-field listening conditions

    • Historical Version