SIST EN ISO 389-7:2020

SLOVENSKI STANDARD
01-februar-2020
Nadomešča:
SIST EN ISO 389-7:2006
SIST EN ISO 389-7:2006/A1:2016
Akustika - Referenčna ničla za umerjanje avdiometrov - 7. del: Referenčni prag
slišnosti v razmerah prostega in difuznega zvočnega polja (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 (ISO
389-7:2019)
Acoustique - Zéro de référence pour l'étalonnage d'équipements audiométriques - Partie
7: Niveau liminaire de référence dans des conditions d'écoute en champ libre et en
champ diffus (ISO 389-7:2019)
Ta slovenski standard je istoveten z: EN ISO 389-7:2019
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 389-7
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2019
EUROPÄISCHE NORM
ICS 13.140 Supersedes EN ISO 389-7:2005
English Version
Acoustics - Reference zero for the calibration of
audiometric equipment - Part 7: Reference threshold of
hearing under free-field and diffuse-field listening
conditions (ISO 389-7:2019)
Acoustique - Zéro de référence pour l'étalonnage
d'équipements audiométriques - Partie 7: Niveau
liminaire de référence dans des conditions d'écoute en
champ libre et en champ diffus (ISO 389-7:2019)
This European Standard was approved by CEN on 20 October 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 389-7:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 389-7:2019) has been prepared by Technical Committee ISO/TC 43 "Acoustics"
in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by
DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2020, and conflicting national standards shall be
withdrawn at the latest by May 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 389-7:2005.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 389-7:2019 has been approved by CEN as EN ISO 389-7:2019 without any modification.

INTERNATIONAL ISO
STANDARD 389-7
Third edition
2019-10
Acoustics — Reference zero for
the calibration of audiometric
equipment —
Part 7:
Reference threshold of hearing under
free-field and diffuse-field listening
conditions
Acoustique — Zéro de référence pour l'étalonnage d'équipements
audiométriques —
Partie 7: Niveau liminaire de référence dans des conditions d'écoute
en champ libre et en champ diffus
Reference number
ISO 389-7:2019(E)
©
ISO 2019
ISO 389-7:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 389-7:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specification . 2
Annex A (informative) Notes on the derivation of the reference thresholds of hearing .5
Bibliography .10
ISO 389-7:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 43, Acoustics.
This third edition cancels and replaces the second edition (ISO 389-7:2005), which has been technically
revised to incorporate the Amendment ISO 389-7:2005/Amd.1:2016. The main changes compared to
the previous edition are as follows:
— the reference thresholds of hearing at 20 Hz under the conditions of free-field and diffuse-field
listening and the reference threshold of hearing at 18 000 Hz under the condition of free-field
listening were recalculated using additional experimental data;
— the Bibliography was updated.
A list of all parts in the ISO 389 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2019 – All rights reserved

ISO 389-7:2019(E)
Introduction
In some audiological applications, the test signals are delivered by means of loudspeakers, either in a
free sound field or in a diffuse sound field. This document specifies the reference zero for the calibration
of audiometric equipment used for sound field audiometry. Corresponding audiometric test methods
are specified in ISO 8253-1 and ISO 8253-2.
In common with other subjective phenomena, the threshold of hearing varies in detail from person
to person but, for a group of otologically normal persons within a restricted age range, values for
the central tendency can be determined to characterize the group. This document and other parts of
ISO 389 specify threshold data applicable to otologically normal persons in the age range from 18 years
to 25 years.
The data specified in this document relate to
a) pure tones heard under conditions of binaural listening in free progressive plane waves with
the subject directly facing the source of sound (frontal incidence), and with the sound pressure
level measured in the free progressive wave at the centre position of the listener’s head with the
listener absent;
b) one-third-octave bands of (white or pink) noise heard under conditions of binaural listening in a
diffuse sound field with the sound pressure level measured in the sound field at the centre position
of the listener’s head with the listener absent.
For frequencies up to 8 kHz, each set of data may be equally applied to any other bands of (white or
pink) noise for which the bandwidth is less than the critical bandwidth.
The data are based on an assessment of technical information provided by laboratories in different
countries representing the most reliable data available at the time. For information, a note on the
derivation of the reference values and the origin of the data is given in Annex A.
INTERNATIONAL STANDARD ISO 389-7:2019(E)
Acoustics — Reference zero for the calibration of
audiometric equipment —
Part 7:
Reference threshold of hearing under free-field and
diffuse-field listening conditions
1 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 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.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
ISO 389-7:2019(E)
3.1
threshold of hearing
level of a sound at which, under specified conditions, a person gives 50 % of correct detection responses
on repeated trials
Note 1 to entry: The results of threshold determination depend to a certain degree on the test procedure used.
The data presented in the ISO 389 series are all based on the use of the threshold test procedures defined in
ISO 8253-1. When a test procedure with other characteristics is used, differences of up to several decibels on
average may be expected.
3.2
otologically normal person
person in a normal state of health who is free from all signs or symptoms of ear disease and from
obstructing wax in th
...