ISO 389-7:2019 PDF

Scope: 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. NOTE 1 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 given in ISO 8253-2 for information. NOTE 2 Other conditions are given in Reference [1]. The data are given in numerical form for the preferred frequencies in the one-third-octave series from 20 Hz to 16000 Hz inclusive in accordance with ISO 266 and, in addition, for some intermediate audiometric frequencies up to 18000 Hz. The threshold data differ from the audiometric zero specified in ISO 389-1, ISO 389-2, ISO 389-5 and referred to specified couplers and ear simulators. Direct comparison between the data in the parts of

ISO 389-7:2019 history

2019 ISO 389-7:2019 Acoustics — Reference zero for the calibration of audiometric equipment — Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions
2016 ISO 389-7:2005/Amd 1:2016 Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions - Amendment 1: Reference threshold of hearing at 20 Hz and 18000 Hz under free-field l
2005 ISO 389-7:2005 Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions
1996 ISO 389-7:1996 Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions