IEC 60268-23:2023

Sound system equipment - Part 23: TVs and monitors - Loudspeaker systems

IEC 60268-23:2023 specifies acoustical measurement methods that apply to TV sets, monitors with built-in loudspeakers, and other audio devices having similar acoustical properties (e.g. flat-panel loudspeakers). The acoustical measurements are performed under free-field conditions and in-situ.
This document does not assess the perception and cognitive evaluation of the reproduced sound, nor the impact of perceived sound quality.

Équipements pour systèmes électroacoustiques - Partie 23: Téléviseurs et moniteurs - Systèmes de haut-parleurs

L'IEC 60268-23:2023 spécifie des méthodes de mesurage acoustique qui s'appliquent aux téléviseurs, aux moniteurs avec haut-parleurs intégrés et à d'autres appareils audio qui présentent des propriétés acoustiques similaires (haut-parleurs plats, par exemple). Les mesurages acoustiques sont réalisés dans des conditions de champ libre et in situ.
Le présent document n'évalue pas la perception et l'évaluation cognitive du son reproduit, ni l'incidence de la qualité perçue du son.

General Information

• Status: Published
• Publication Date: 23-Feb-2023
• ICS: 33.160.01 - Audio, video and audiovisual systems in general
• ICS: 33.160.50 - Accessories
• Technical Committee: TA 20 - Analogue and digital audio
• Drafting Committee: PT 60268-23 - TC 100/TA 20/PT 60268-23
• Current Stage: PPUB - Publication issued
• Start Date: 03-Apr-2023
• Completion Date: 24-Feb-2023

Standards Content (Sample)

IEC 60268-23
®

Edition 1.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Sound system equipment –
Part 23: TVs and monitors – Loudspeaker systems

Équipements pour systèmes électroacoustiques –
Partie 23: Téléviseurs et moniteurs – Systèmes de haut-parleurs

IEC 60268-23:2023-02(en-fr)

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IEC 60268-23

®


Edition 1.0 2023-02




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE
colour

inside










Sound system equipment –

Part 23: TVs and monitors – Loudspeaker systems



Équipements pour systèmes électroacoustiques –

Partie 23: Téléviseurs et moniteurs – Systèmes de haut-parleurs
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.160.01; 33.160.50 ISBN 978-2-8322-6548-2




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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 60268-23:2023 © IEC 2023
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviated terms . 10
3.2 Abbreviated terms . 11
4 Type description . 12
5 Physical characteristics . 12
5.1 Dimensions . 12
5.2 Mass . 12
6 Conditions . 12
6.1 Normal measuring conditions . 12
6.2 Rated conditions . 13
6.3 Rated frequency range . 13
6.4 Climatic conditions . 13
7 Test signals . 13
7.1 General . 13
7.2 Sinusoidal chirp signal . 13
7.3 Steady-state single-tone signal . 13
7.4 Steady-state two-tone signal . 14
7.5 Sparse multi-tone complex . 14
7.6 Broadband noise signal . 14
7.7 Narrow-band noise signal . 14
7.8 Hann-burst signal . 14
7.9 Impulsive signal . 14
8 Acoustical environment . 14
8.1 General . 14
8.2 Free-field conditions . 14
8.3 Simulated free-field conditions . 14
8.4 In-situ environment . 15
8.5 Listening room . 15
9 Measurement equipment . 15
10 Positioning of the EUT . 15
10.1 Reference plane and normal vector . 15
10.2 Reference point . 15
10.3 Reference axis . 16
10.4 Orientation vector . 16
10.5 Horizontal and Vertical Trajectories . 18
11 Measuring distance between EUT and microphone . 18
11.1 Far-field conditions . 18
11.2 Near-field conditions . 18
12 Mounting of the EUT . 19
12.1 General . 19
12.2 Mounting methods . 19
12.2.1 Stand-type . 19

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IEC 60268-23:2023 © IEC 2023 – 3 –
12.2.2 Wall mount-type . 19
12.3 Mounting for free-field conditions . 20
12.3.1 General . 20
12.3.2 EUT rotating condition . 20
12.3.3 Microphone rotating condition . 20
13 Rated ambient conditions . 20
13.1 Temperature ranges . 20
13.1.1 Performance limited temperature range . 20
13.1.2 Damage limited temperature range . 21
13.2 Humidity ranges . 21
13.2.1 Relative humidity range . 21
13.2.2 Damage limited humidity range . 21
14 Evaluation point and distance . 21
14.1 Evaluation point . 21
14.2 Evaluation distance . 21
15 Free-field measurements . 22
15.1 General . 22
15.2 On-axis SPL FR . 22
15.2.1 Definition . 22
15.2.2 Measurement methods . 22
15.2.3 Reporting . 22
15.3 Spatial transfer function . 23
15.3.1 Definition . 23
15.3.2 Measurement method . 23
15.3.3 Reporting . 24
15.4 Sound power response . 24
15.4.1 Definition . 24
15.4.2 Measurement methods . 25
15.4.3 Reporting . 25
15.5 Directional characteristics . 26
15.5.1 General . 26
15.5.2 Measurement methods . 27
15.5.3 Post-processing . 27
15.5.4 Reporting . 30
16 In-situ testing . 30
16.1 General . 30
16.2 In-situ transfer function . 31
16.2.1 Definition . 31
16.2.2 Measurement method . 32
16.2.3 Reporting . 33
16.3 Room transfer function . 33
16.3.1 Definition . 33
16.3.2 Measurement method . 33
16.4 Reflected sound SPL response . 34
16.4.1 Definition . 34
16.4.2 Measurement method . 34
16.4.3 Reporting . 35
16.5 In-situ SPL FR . 35

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– 4 – IEC 60268-23:2023 © IEC 2023
16.5.1 Definition . 35
16.5.2 Measurement methods . 35
16.5.3 Reporting . 36
17 Mean SPL in an acoustical zone . 37
17.1 General . 37
17.2 Definition . 37
17.3 Measurement . 38
17.4 Numerical prediction . 38
17.5 Reporting . 38
18 FR characteristics . 38
18.1 General . 38
18.2 Mean value of SPL in a rated frequency range . 39
18.2.1 Definition and unit . 39
18.2.2 Setup . 39
18.2.3 Procedure . 39
18.2.4 Analysis . 39
18.2.5 Reporting . 40
18.3 Effective frequency range (EFR) . 40
18.3.1 Definition and unit . 40
18.3.2 Setup . 40
18.3.3 Procedure . 40
18.3.4 Analysis . 41
18.3.5 Reporting . 41
18.4 Spectral balance (SB) . 42
18.4.1 Definition and unit . 42
18.4.2 Setup . 42
18.4.3 Procedure . 42
18.4.4 Analysis . 42
18.4.5 Reporting . 43
18.5 Regression line deviation (RLD) . 43
18.5.1 Definition and unit . 43
18.5.2 Setup . 43
18.5.3 Procedure . 43
18.5.4 Analysis . 44
18.5.5 Reporting . 44
18.6 Narrow band variation (NBV) . 45
18.6.1 Definition and unit . 45
18.6.2 Setup . 45
18.6.3 Procedure . 45
18.6.4 Analysis . 45
18.6.5 Reporting . 46
19 Large-signal characteristics . 46
19.1 Modelling at high amplitudes . 46
19.2 Noise spectrum . 47
19.2.1 Definition and measurement . 47
19.2.2 Reporting . 47
19.3 Short-term amplitude compression . 47
19.3.1 Definition and unit . 47
19.3.2 Setup . 47

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IEC 60268-23:2023 © IEC 2023 – 5 –
19.3.3 Procedure . 47
19.3.4 Analysis . 48
19.3.5 Reporting . 48
19.4 Multi-tone distortion . 48
19.4.1 Multi-tone distortion spectrum . 48
19.4.2 Absolute multi-tone distortion . 50
19.4.3 Relative multi-tone distortion . 51
19.4.4 Total multi-tone distortion ratio . 52
19.5 Harmonic distortion in sound pressure output . 53
19.5.1 Definition and unit . 53
19.5.2 Setup . 54
19.5.3 Procedure and analysis . 54
19.5.4 Reporting . 55
19.6 Equivalent input total harmonic distortion . 56
19.6.1 Definition and unit . 56
19.6.2 Setup . 57
19.6.3 Procedure . 57
19.6.4 Analysis . 57
19.6.5 Reporting . 58
19.7 Impulsive distortion . 59
19.7.1 Definition and unit . 59
19.7.2 Setup . 59
19.7.3 Procedure . 59
19.7.4 Analysis . 59
19.7.5 Reporting . 60
19.8 Rated maximum input value . 60
19.8.1 Definition and unit . 60
19.8.2 Setup . 60
19.8.3 Procedure . 61
19.8.4 Analysis . 62
19.8.5 Reporting . 62
19.9 Rated maximum SPL . 62
19.9.1 Definition and unit . 62
19.9.2 Setup . 62
19.9.3 Procedure . 62
19.9.4 Reporting . 63
Bibliography . 64

Figure 1 –Test signal scope . 12
Figure 2 –Recommended position and orientation of the EUT . 16
Figure 3 – Measuring the horizontal directivity in spherical coordinates by rotating the
EUT (e.g., OLED TV) in upright position. 17
Figure 4 – Measuring the vertical directivity in spherical coordinates by rotating the

tilted EUT (e.g. OLED TV) . 17
Figure 5 – Example for stand-type . 19
Figure 6 – Example for wall mount-type. . 20
Figure 7 – Evaluation point and distance (centre) . 21
Figure 8 – SPL distribution of the direct sound represented in colour in 3D . 24

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– 6 – IEC 60268-23:2023 © IEC 2023
Figure 9 – Measurement locations at vertical and horizontal trajectories at distance r . 26
d
Figure 10 – Measurement locations at listening window .
...