IEC 60318-7:2022

IEC 60318-7 ®
Edition 1.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Simulators of human head and ear –
Part 7: Head and torso simulator for the measurement of sound sources close to
the ear
Électroacoustique – Simulateurs de tête et d'oreille humaines –
Partie 7: Simulateur de tête et de torse pour le mesurage des sources sonores à
proximité de l'oreille
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IEC 60318-7 ®
Edition 1.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electroacoustics – Simulators of human head and ear –

Part 7: Head and torso simulator for the measurement of sound sources close to

the ear
Électroacoustique – Simulateurs de tête et d'oreille humaines –

Partie 7: Simulateur de tête et de torse pour le mesurage des sources sonores à

proximité de l'oreille
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.50 ISBN 978-2-8322-0857-1

– 2 – IEC 60318-7:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Construction . 11
4.1 General . 11
4.2 Geometrical dimensions of the manikin . 11
4.2.1 Head and torso . 11
4.2.2 Pinna simulators for hearing aid measurements . 13
4.2.3 Ear canal extension . 14
4.2.4 Ear simulator . 16
4.2.5 Materials . 16
4.3 Acoustical characteristics of the manikin . 17
4.3.1 Free-field frequency response . 17
4.3.2 Diffuse-field frequency response . 19
4.3.3 Acceptance intervals . 20
4.3.4 Openings . 20
5 Calibration . 21
5.1 Reference environmental conditions . 21
5.2 Calibration method . 21
5.2.1 General . 21
5.2.2 Test signal, test space and measurement equipment . 21
5.2.3 Measurement of sound pressure level. 22
5.2.4 Alignment of manikin azimuth and elevation . 23
5.2.5 Test for sound leakage . 23
6 Marking and instruction manual . 23
6.1 Markings of the manikin . 23
6.2 Instruction manual . 24
7 Maximum permitted uncertainty of measurements . 24
Annex A (informative) Design example of an anatomically shaped manikin . 26
Annex B (informative) Design examples of a geometrically shaped manikin . 27
Annex C (informative) Relationship between tolerance interval, corresponding
acceptance interval and the maximum permitted uncertainty of measurement . 29
Annex D (informative) 3D representation of example pinna simulators . 30
D.1 Background. 30
D.2 Scanning technique . 30
D.3 Examples of pinna simulator shape . 30
D.4 Verification of conformance . 31
Bibliography . 32

Figure 1 – Manikin geometrical references . 8
Figure 2 – Coordinate scheme for azimuth and elevation angles . 9
Figure 3 – Illustration of manikin head and torso dimensions . 12
Figure 4 – Illustration of manikin pinna simulator dimensions . 15
Figure A.1 – Example of an anatomically shaped manikin . 26

Figure B.1 – Example 1 of a geometrically shaped manikin . 27
Figure B.2 – Example 2 of a geometrically shaped manikin . 28
Figure C.1 – Relationship between tolerance interval, corresponding acceptance
interval and the maximum permitted uncertainty of measurement . 29
Figure D.1 – Example of a pinna simulator (embedded 3D PDFs) . 31

Table 1 – Manikin head and torso dimensions . 13
Table 2 – Dimensions of the pinna simulator and the cylindrical ear canal extension of
the manikin . 15
Table 3 – Dimensions of the pinna simulator and the tapered ear canal extension of
the manikin . 16
Table 4 – Free-field frequency response of the manikin (right ear) for an azimuth angle
of 0° in one-twelfth-octave bands . 18
Table 5 – Free-field frequency responses of the manikin (right ear) for azimuth angles
of 90°, 180° and 270° in one-twelfth-octave bands . 19
Table 6 – Diffuse-field frequency response of the manikin (right ear) in one-third-
octave bands . 20
Table 7 – Maximum permitted uncertainty U for type approval measurements . 25
max
– 4 – IEC 60318-7:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROACOUSTICS –
SIMULATORS OF HUMAN HEAD AND EAR –

Part 7: Head and torso simulator for the measurement
of sound sources close to the ear

FOREWORD
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co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical commit
...