EN ISO 389-1:2000
(Main)Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones (ISO 389-1:1998)
Acoustics - Reference zero for the calibration of audiometric equipment - Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones (ISO 389-1:1998)
Migrated from Progress Sheet (TC Comment) (2000-07-10): Revision of EN ISO 389:1995 (CC/990108)
Akustik - Bezugspegel für die Kalibrierung von audiometrischen Geräten - Teil 1: Äquivalenter Bezugs-Schwellenschalldruckpegel für Reintöne und supraaurale Kopfhörer
Dieser Teil der Internationalen Norm ISO 389 legt Standard-Bezugspegel für die Hörschwellenpegel-Skale von Reinton-Luftleitungs-Audiometern fest, um die weltweite Übereinstimmung und Einheitlichkeit in der Angabe der Ergebnisse von Hörschwellenpegel-Messungen zu fördern.
Acoustique - Zéro de référence pour l'étalonnage d'équipements audiométriques - Partie 1: Niveaux de référence équivalents de pression acoustique liminaire pour les écouteurs à sons purs supra-auraux (ISO 389-1:1998)
La présente partie de l'ISO 389 prescrit un zéro normal de référence pour l'échelle des niveaux liminaires d'audition, applicable aux audiomètres à sons purs en conduction aérienne, en vue de promouvoir la concordance et l'uniformité d'expression des mesurages des niveaux liminaires d'audition dans le monde.Elle expose les données sous une forme se prêtant à leur application directe et à l'étalonnage des audiomètres, c'est-à-dire sous forme de réponse de deux modèles types d'écouteurs, mesurés sur un coupleur selon la CEI 60303, et sous forme d'autres écouteurs supra-auraux dont les caractéristiques sont prescrites en 4.3 et mesurées sur une oreille artificielle conformément à la CEI 60318.La présente Norme internationale est basée sur l'évaluation des informations recueillies auprès de divers laboratoires d'étalonnage responsables de normes audiométriques et extraites de publications scientifiques.Des commentaires sur la détermination et l'application des niveaux de référence recommandés sont donnés dans l'annexe A.
Akustika - Referenčna ničla za umerjanje avdiometrov - 1. del: Referenčni ekvivalentni prag ravni zvočnega tlaka za čiste tone (ISO 389-1:1998)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2001
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SIST EN ISO 389:1999
$NXVWLND5HIHUHQþQDQLþOD]DXPHUMDQMHDYGLRPHWURYGHO 5HIHUHQþQL
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Acoustics - Reference zero for the calibration of audiometric equipment - Part 1:
Reference equivalent threshold sound pressure levels for pure tones and supra-aural
earphones (ISO 389-1:1998)
Akustik - Bezugspegel für die Kalibrierung von audiometrischen Geräten - Teil 1:
Äquivalenter Bezugs-Schwellenschalldruckpegel für Reintöne und supraaurale Kopfhörer
Acoustique - Zéro de référence pour l'étalonnage d'équipements audiométriques - Partie
1: Niveaux de référence équivalents de pression acoustique liminaire pour les écouteurs
a sons purs supra-auraux (ISO 389-1:1998)
Ta slovenski standard je istoveten z: EN ISO 389-1:2000
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 389-1
First edition
1998-11-01
Acoustics — Reference zero for the
calibration of audiometric equipment —
Part 1:
Reference equivalent threshold sound
pressure levels for pure tones and supra-aural
earphones
Acoustique — Zéro de référence pour l’étalonnage d’équipements
audiométriques —
Partie 1: Niveaux de référence équivalents de pression acoustique liminaire
pour les écouteurs à sons purs supra-auraux
A
Reference number
ISO 389-1:1998(E)
ISO 389-1:1998(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.
International Standards are drafted in accordance with ISO/IEC Directives,
Part 3.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 389-1 was prepared by Technical Committee
ISO/TC 43, Acoustics.
This first edition cancels and replaces ISO 389:1991. It is a minor revision
in order to make it part of the ISO 389 series.
ISO 389 consists of the following parts, under the general title Acoustics —
Reference zero for the calibration of audiometric equipment:
— Part 1: Reference equivalent threshold sound pressure levels for pure
tones and supra-aural earphones
— Part 2: Reference equivalent threshold sound pressure levels for pure
tones and insert earphones
— Part 3: Reference equivalent threshold force levels for pure tones and
bone vibrators
— Part 4: Reference levels for narrow-band masking noise
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
©
ISO ISO 389-1:1998(E)
— Part 5: Reference equivalent threshold sound pressure levels for pure
tones in the frequency range 8 kHz to 16 kHz
— Part 6: Reference equivalent threshold sound pressure levels for
acoustic test signals of short duration
— Part 7: Reference threshold of hearing under free-field and diffuse-field
listening conditions
Annex A of this part of ISO 389 is for information only.
iii
©
ISO 389-1:1998(E) ISO
Introduction
Each part of ISO 389 specifies a specific reference zero for the calibration
of audiometric equipment. The present part 1 is applicable to audiometric
equipment for the transmission of pure tones by air conduction and
supra-aural earphones. ISO 389-2 is applicable to audiometric equipment
for the transmission of pure tones by air conduction and insert earphones.
ISO 389-3 is applicable to pure-tone bone-conduction audiometers,
ISO 389-4 specifies reference levels for narrow-band masking noise, and
ISO 389-7 specifies reference levels for presentation in free and diffuse
sound fields.
The first edition of ISO 389 specified a standard reference zero for the
scale of hearing threshold level applicable to pure-tone air conduction
audiometers in terms of the response of certain models of earphone
measured on an artificial ear or coupler of stated type. Five of these
earphone-coupler combinations corresponded with those used at that time
in standardizing laboratories in France, Germany, the United Kingdom, the
USA and the USSR. In a second set of values, the corresponding
reference equivalent threshold sound pressure levels (RETSPL) for eleven
audiometric earphones were given, referred to a single type of coupler, the
National Bureau of Standards, Washington, USA type 9A coupler, which
was later specified in IEC 303:1970 (now IEC 60303).
Most of the earphone-coupler combinations mentioned in the first edition of
ISO 389 are now no longer in use. The ISO member bodies of the
countries primarily concerned with those types of standard earphones and
artificial ears agreed to eliminate obsolete data. This was done in the
second edition of ISO 389. It contained only RETSPL values for two
earphone models still widely in use for audiometric purposes, namely
Telephonics type TDH 39 with cushion type MX 41/AR (or model 51) and
Beyer type DT 48, both in conjunction with an acoustic coupler complying
with IEC 303:1970.
The two remaining sets of data differ mainly as a consequence of
differences between the acoustical properties of the coupler and those of
the average human ear.
For the same reason, the RETSPL for an earphone of a model not covered
by ISO 389 could not be inferred from the data given in that International
Standard. Until then it had been necessary to obtain the appropriate values
by subjective comparison with one of the specified models of earphone.
In principle, RETSPL values would be rendered independent of earphone
model if they were referred to an artificial ear having acoustical properties
exactly simulating those of the average human ear. A device designed with
this aim in view was standardized in 1970 in IEC 318:1970 (now
IEC 60318).
iv
©
ISO ISO 389-1:1998(E)
Addendum 1 to ISO 389:1985 was therefore prepared, based on an
assessment of technical data provided by laboratories listed in annex A on
RETSPL values relative to the IEC artificial ear, covering a variety of
earphone models.
These data were analysed to produce a set of RETSPL values which,
within an acceptable tolerance, provide a standard audiometric reference
zero for earphones of any model within a broadly defined class. A note on
the derivation of the standard values and the origin of the data input is
given in annex A for information.
Use of the standard reference zero specified in Addendum 1 obviated the
need for subjective calibration of supra-aural audiometric earphones which
meet the broad requirements specified, and thus promoted agreement and
uniformity in the expression of hearing threshold levels throughout the
world, without inhibiting the development of improved models of supra-
aural earphone.
The data of Addendum 1 were incorporated in ISO 389:1991.
In both ISO 389 and ISO 389/Add. 1, the RETSPL values were specified
for pure tones in octave steps from 125 Hz to 8 000 Hz and for the
intermediate audiometric frequencies 1 500 Hz, 3 000 Hz and 6 000 Hz.
However, in addition, 750 Hz is sometimes used as an intermediate
audiometric frequency, and Addendum 2 to ISO 389:1985 therefore
specified RETSPL values for that frequency.
Moreover, it had been considered desirable to harmonize intermediate
frequencies used in pure-tone audiometry with the preferred frequencies in
acoustics as specified in ISO 266. Addendum 2 therefore specified
RETSPL values at all preferred frequencies in one-third-octave steps in the
frequency range from 125 Hz to 8 000 Hz. Details of the derivation of the
RETSPL values are given in annex A for further information. The data of
Addendum 2 were also incorporated in ISO 389:1991.
The RETSPL value specified at 750 Hz is intended for calibration of
audiometers providing pure tones of a fixed frequency of 750 Hz. The other
RETSPL values specified are primarily intended for calibration of pure-tone
audiometers having a continuously variable frequency, but they may also
be used in other applications, for example for establishing reference levels
for masking noise. The frequencies given in ISO 389:1985 and
Addendum 2 are consistent with the frequencies used in ISO 389-3 for the
specification of the standard reference zero for the calibration of bone
conduction audiometers. Three sets of RETSPL values were specified.
Two of these concern the same earphone models as in ISO 389:1985. The
third set of RETSPL values were specified for supra-aural earphones other
than those covered by ISO 389:1985 but which fulfil the requirements
specified in ISO 389/Add. 1.
v
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INTERNATIONAL STANDARD ISO ISO 389-1:1998(E)
Acoustics — Reference zero for the calibration of audiometric
equipment —
Part 1:
Reference equivalent threshold sound pressure levels for pure tones
and supra-aural earphones
1 Scope
This part of ISO 389 specifies a standard reference zero for the scale of hearing threshold level applicable to pure-
tone air conduction audiometers, in order to promote agreement and uniformity in the expression of hearing
threshold level measurements throughout the world.
It states the information in a form suitable for direct application to the calibration of audiometers, that is, in terms of
the response of two different standard models of earphone measured on a coupler complying with IEC 60303 and in
terms of other supra-aural earphones of models specified in 4.3 measured on an artificial ear complying with
IEC 60318.
It is based on an assessment of the information available from the various standardizing laboratories responsible for
audiometric standards and from scientific publications.
Some notes on the derivation and application of the recommended reference levels are given in annex A.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 389. For dated references, subsequent amendments to, or revisions of, any of these publications do
not apply. However, parties to agreements based on this part of ISO 389 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
1)
IEC 60303, IEC provisional reference coupler for the calibration of earphones used in audiometry.
2)
IEC 60318, An IEC artificial ear, of the wide band type, for the calibration of earphones used in audiometry.
___________
1) Now revised as IEC 60318-3.
2) Now revised as IEC 60318-1.
©
ISO 389-1:1998(E) ISO
3 Terms and definitions
For the purposes of this part of ISO 389, the following terms and definitions apply.
3.1
air conduction
transmission of sound through the external and middle ear to the inner ear
3.2
acoustic coupler
cavity of specified shape and volume which is used for the calibration of a supra-aural earphone in conjunction with
a calibrated microphone to measure the sound pressure developed within the cavity
NOTE An acoustic coupler is specified in IEC 60303.
3.3
artificial ear
device for the calibration of an earphone which presents to the earphone an acoustic impedance equivalent to the
impedance presented by the average human ear
NOTE 1 It is equipped with a calibrated microphone for the measurement of the sound pressure developed by the earphone.
NOTE 2 An artificial ear is specified in IEC 60318.
3.4
threshold of hearing
level of a sound at which, under specified conditions, a person gives 50 % of correct detection responses on
repeated trials
3.5
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
the ear canal, and who has no history of undue exposure to noise, exposure to potentially oxotoxic drugs, or familial
hearing loss
3.6
equivalent threshold sound pressure level (monaural earphone listening)
for a given ear, at a specified frequency, for a specified model of earphone and for a stated force of application of
the earphone to the human ear, the sound pressure level set up by the earphone in a specified acoustic coupler or
artificial ear when the earphone is actuated by that voltage which, with the earphone applied to the ear concerned,
would correspond to the threshold of hearing
3.7
reference equivalent threshold sound pressure level (RETSPL)
at a specified frequency, the modal value of the equivalent threshold sound pressure levels of a sufficiently large
number of ears of otologically normal persons, of both sexes, aged between 18 and 30 years inclusive, expressing
the threshold of hearing in a specified acoustic coupler or artificial ear for a specified type of earphone
NOTE The relationship between hearing threshold levels for air conduction and age is specified in ISO 7029.
3.8
hearing level (of a pure tone)
at a specified frequency, for a specified model of earphone and for a specified manner of application, the sound
pressure level of this pure tone produced by the earphone in a specified acousti
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