IEC 60645-3:2020

Electroacoustics - Audiometric equipment - Part 3: Test signals of short duration

IEC 60645-3:2020 specifies a means of describing the physical characteristics, in terms of electrical waveforms, of audiometric reference and test signals of short duration and methods for their measurement.
The object of this document is to ensure that audiometric stimuli of short duration are specified and measured in the same way and that the calibration of equipment using such signals is carried out using defined methods.
This document does not describe the method of use of short-duration test signals.
IEC 60645-3:2020 cancels and replaces the second edition published in 2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) new figures of reference signals;
b) changes in definitions.

Electroacoustique - Appareils audiométriques - Partie 3: Signaux d'essai de courte durée

L'IEC 60645-3:2020 spécifie un moyen pour décrire les caractéristiques physiques en tant que formes d'ondes électriques, de signaux audiométriques de courte durée de référence et d'essai, ainsi que leurs méthodes de mesure.
L'objet du présent document est de s'assurer que les stimuli audiométriques de courte sont spécifiés et mesurés de la même manière et que l'étalonnage des appareils qui utilisent de tels signaux est effectué selon des méthodes définies.
Le présent document n'a pas pour objet de décrire la méthode d'utilisation des signaux d'essai de courte durée.
L'IEC 60645-3:2020 annule et remplace la deuxième édition parue en 2007. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout de nouvelles figures pour les signaux de référence;
b) modification de certaines définitions.

General Information

• Status: Published
• Publication Date: 28-Sep-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.140.50 - Electroacoustics
• Technical Committee: TC 29 - Electroacoustics
• Drafting Committee: WG 10 - TC 29/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 30-Oct-2020
• Completion Date: 29-Sep-2020

Relations

• Revises: IEC 60645-3:2007 - Electroacoustics - Audiometric equipment - Part 3: Test signals of short duration
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60645-3 ®
Edition 3.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Audiometric equipment –
Part 3: Test signals of short duration

Électroacoustique – Appareils audiométriques –
Partie 3: Signaux d'essai de courte durée

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IEC 60645-3 ®
Edition 3.0 2020-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Audiometric equipment –

Part 3: Test signals of short duration

Électroacoustique – Appareils audiométriques –

Partie 3: Signaux d'essai de courte durée

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-8901-3

– 2 – IEC 60645-3:2020 © IEC 2020
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Reference signals . 10
4.1 General . 10
4.2 Reference click . 11
4.3 Reference tone-burst . 11
4.4 Reference broadband chirp . 12
4.5 Reference octave-band chirps . 12
5 Calibration and measurement of short-duration signals . 13
BibIiography . 14

Figure 1 – Basic specification of an electrical reference click . 7
Figure 2 – Illustration of the method of measurement of peak-to-peak equivalent signal
levels . 8
Figure 3 – Temporal characteristics of an electrical reference tone-burst . 8
Figure 4 – Time domain specification of the electrical reference click . 11
Figure 5 – Temporal characteristics of the electrical reference broadband chirp. 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS – AUDIOMETRIC EQUIPMENT –

Part 3: Test signals of short duration

FOREWORD
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International Standard IEC 60645-3 has been prepared by IEC technical committee 29:
Electroacoustics.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) new figures of reference signals;
b) changes in definitions.
– 4 – IEC 60645-3:2020 © IEC 2020
The text of this International Standard is based on the following documents:
FDIS Report on voting
29/1066/FDIS 29/1070/RVD
Full information on the voting for the approval of this document can be found in the report on
voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60645 series, under the general title Electroacoustics – Audiometric
equipment, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the document will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
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INTRODUCTION
Developments in the field of hearing measurements for diagnostic, hearing conservation and
rehabilitation purposes have resulted in the availability of a wide range of audiometric
equipment. In addition, it is possible to consider audiometric equipment in terms of a set of
functional units that can be specified independently. By specifying these functional units, it is
then possible to specify the performance of other audiometric equipment that uses these units.
The IEC 60645 series consists of a number of parts. IEC 60645-3 covers the requirements for
reference and other test signals of short duration.
Examples of test methods, where such signals are commonly used, are the recording of auditory
evoked potentials and evoked otoacoustic emissions. Reference signals are described in order
to provide a basis for calibration and as a recommendation for use when there is no specific
reason to have an alternative signal. Measurement methods for short duration acoustic and
vibratory test signals are described.

– 6 – IEC 60645-3:2020 © IEC 2020
ELECTROACOUSTICS – AUDIOMETRIC EQUIPMENT –

Part 3: Test signals of short duration

1 Scope
This part of IEC 60645 specifies a means of describing the physical characteristics, in terms of
electrical waveforms, of audiometric reference and test signals of short duration and methods
for thei
...