oSIST prEN IEC 60268-23:2022
(Main)Sound system equipment - Part 23: TVs and monitors - Loudspeaker systems
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.
Elektroakustische Geräte - Teil 23: Fernsehgeräte und Monitore - Lautsprecher Systeme
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.
Oprema zvokovnega sistema - 23. del: Televizijski sprejemniki in monitorji - Sistemi zvočnikov
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60268-23:2022
01-september-2022
Oprema zvokovnega sistema - 23. del: Televizijski sprejemniki in monitorji -
Sistemi zvočnikov
Sound system equipment - Part 23: TVs and monitors - Loudspeaker systems
Équipements pour systèmes électroacoustiques - Partie 23: Téléviseurs et moniteurs -
Systèmes de haut-parleursTa slovenski standard je istoveten z: prEN IEC 60268-23:2022
ICS:
33.160.50 Pribor Accessories
oSIST prEN IEC 60268-23:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 60268-23:2022
100/3774/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60268-23 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-07-01 2022-09-23
SUPERSEDES DOCUMENTS:
100/3700/CD, 100/3746/CC
IEC TA 20 : ANALOGUE AND DIGITAL AUDIO
SECRETARIAT: SECRETARY:
Japan Mr Nobukazu Suzuki
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 100
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel votingThe attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.TITLE:
SOUND SYSTEM EQUIPMENT - Part 23: TVs and monitors - Loudspeaker systems
PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
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oSIST prEN IEC 60268-23:2022
IEC CDV 60268-23 IEC:2022 – 2 –
1 CONTENTS
3 FOREWORD ........................................................................................................................... 8
4 INTRODUCTION ................................................................................................................... 10
5 1 Scope ............................................................................................................................ 11
6 2 Normative references .................................................................................................... 11
7 3 Terms and definitions .................................................................................................... 12
8 4 Type description ............................................................................................................ 13
9 5 Physical characteristics ................................................................................................. 14
10 5.1 Dimensions ........................................................................................................... 14
11 5.2 Mass ..................................................................................................................... 14
12 6 Conditions ..................................................................................................................... 14
13 6.1 Normal measuring conditions ................................................................................ 14
14 6.2 Rated conditions ................................................................................................... 14
15 6.2.1 Rated frequency range .................................................................................. 15
16 6.3 Climatic conditions ................................................................................................ 15
17 7 Test signals ................................................................................................................... 15
18 7.1 General ................................................................................................................. 15
19 7.2 Sinusoidal chirp signal .......................................................................................... 15
20 7.3 Steady-state single-tone signal ............................................................................. 15
21 7.4 Steady-state two-tone signal ................................................................................. 15
22 7.5 Sparse multi-tone complex .................................................................................... 15
23 7.6 Broadband noise signal ......................................................................................... 15
24 7.7 Narrow-band noise signal ..................................................................................... 15
25 7.8 Hann-burst signal .................................................................................................. 15
26 7.9 Impulsive signal .................................................................................................... 15
27 8 Acoustical environment .................................................................................................. 15
28 8.1 General ................................................................................................................. 15
29 8.2 Free-field conditions ............................................................................................. 16
30 8.3 Simulated free-field conditions .............................................................................. 16
31 8.4 In-situ environment ............................................................................................... 16
32 8.4.1 Listening room ............................................................................................... 16
33 9 Measurement equipment ............................................................................................... 16
34 10 Positioning of the EUT ................................................................................................... 17
35 10.1 Reference plane and normal vector ....................................................................... 17
36 10.2 Reference point .................................................................................................... 17
37 10.3 Reference axis ...................................................................................................... 17
38 10.4 Orientation vector ................................................................................................. 17
39 10.5 Horizontal and Vertical Trajectories ...................................................................... 19
40 11 Measuring distance between EUT and microphone ........................................................ 19
41 11.1 Far-field conditions ............................................................................................... 19
42 11.2 Near-field conditions ............................................................................................. 19
43 12 Mounting of the EUT ...................................................................................................... 20
44 12.1 General ................................................................................................................. 20
45 12.1.1 Stand-type ..................................................................................................... 20
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IEC CDV 60268-23 IEC:2022 – 3 –
46 12.1.2 Wall mount-type............................................................................................. 20
47 12.2 Mounting for free-field conditions .......................................................................... 21
48 12.2.1 EUT rotating condition ................................................................................... 21
49 12.2.2 Microphone rotating condition ........................................................................ 21
50 13 Rated ambient conditions .............................................................................................. 21
51 13.1 Temperature ranges.............................................................................................. 21
52 13.1.1 Performance limited temperature range ......................................................... 21
53 13.1.2 Damage limited temperature range ................................................................ 21
54 13.2 Humidity ranges .................................................................................................... 22
55 13.2.1 Relative humidity range ................................................................................. 22
56 13.2.2 Damage limited humidity range ...................................................................... 22
57 14 Evaluation point and distance ........................................................................................ 22
58 14.1 Evaluation point .................................................................................................... 22
59 14.2 Evaluation distance ............................................................................................... 22
60 15 Free-field measurements ............................................................................................... 23
61 15.1 General ................................................................................................................. 23
62 15.2 On-axis SPL frequency response .......................................................................... 23
63 15.2.1 Definition ....................................................................................................... 23
64 15.2.2 Measurement methods .................................................................................. 23
65 15.2.3 Reporting ....................................................................................................... 23
66 15.3 Spatial transfer function ........................................................................................ 23
67 15.3.1 Definition ....................................................................................................... 23
68 15.3.2 Measurement method .................................................................................... 24
69 15.3.3 Reporting ....................................................................................................... 25
70 15.4 Sound power response ......................................................................................... 25
71 15.4.1 Definition ....................................................................................................... 25
72 15.4.2 Measurement methods .................................................................................. 25
73 15.4.3 Reporting ....................................................................................................... 26
74 15.5 Directional Characteristics .................................................................................... 26
75 15.5.1 General ......................................................................................................... 26
76 15.5.2 Measurement methods .................................................................................. 27
77 15.5.3 Post-processing ............................................................................................. 28
78 15.5.4 Reporting ....................................................................................................... 30
79 16 In-situ Testing ............................................................................................................... 31
80 16.1 In-situ transfer function ......................................................................................... 32
81 16.1.1 Definition ....................................................................................................... 32
82 16.1.2 Measurement method .................................................................................... 32
83 16.1.3 Reporting ....................................................................................................... 33
84 16.2 Room transfer function .......................................................................................... 33
85 16.2.1 Definition ....................................................................................................... 33
86 16.2.2 Measurement method .................................................................................... 34
87 16.3 Reflected sound SPL response ............................................................................. 34
88 16.3.1 Definition ....................................................................................................... 34
89 16.3.2 Measurement method .................................................................................... 34
90 16.3.3 Reporting ....................................................................................................... 35
91 16.4.1 Definition ....................................................................................................... 35
92 16.4.2 Measurement methods .................................................................................. 35
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IEC CDV 60268-23 IEC:2022 – 4 –
93 16.4.3 Reporting ....................................................................................................... 36
94 17 Mean SPL and Variance in an acoustical zone .............................................................. 37
95 17.1 General ................................................................................................................. 37
96 17.2 Definition .............................................................................................................. 37
97 17.3 Measurement ....................................................................................................... 38
98 17.4 Numerical Prediction ............................................................................................. 38
99 17.5 Reporting .............................................................................................................. 38
100 18 Frequency response characteristics ............................................................................... 38
101 18.1 General ................................................................................................................. 38
102 18.2 Mean value of SPL in a rated frequency range ...................................................... 39
103 18.2.1 Definition and unit.......................................................................................... 39
104 18.2.2 Setup ............................................................................................................. 39
105 18.2.3 Procedure ...................................................................................................... 39
106 18.2.4 Analysis ......................................................................................................... 39
107 18.2.5 Reporting ....................................................................................................... 40
108 18.3 Effective frequency range (EFR) ........................................................................... 40
109 18.3.1 Definition and unit.......................................................................................... 40
110 18.3.2 Setup ............................................................................................................. 40
111 18.3.3 Procedure ...................................................................................................... 40
112 18.3.4 Analysis ......................................................................................................... 41
113 18.3.5 Reporting ....................................................................................................... 41
114 18.4 Spectral Balance (SB) ........................................................................................... 42
115 18.4.1 Definition and unit.......................................................................................... 42
116 18.4.2 Setup ............................................................................................................. 42
117 18.4.3 Procedure ...................................................................................................... 42
118 18.4.4 Analysis ......................................................................................................... 42
119 18.4.5 Reporting ....................................................................................................... 43
120 18.5 Regression line deviation (RLD) ............................................................................ 43
121 18.5.1 Definition and unit.......................................................................................... 43
122 18.5.2 Setup ............................................................................................................. 43
123 18.5.3 Procedure ...................................................................................................... 43
124 18.5.4 Analysis ......................................................................................................... 44
125 18.5.5 Reporting ....................................................................................................... 45
126 18.6 Narrow Band Variation (NBV) ................................................................................ 45
127 18.6.1 Definition and unit.......................................................................................... 45
128 18.6.2 Setup ............................................................................................................. 45
129 18.6.3 Procedure ...................................................................................................... 45
130 18.6.4 Analysis ......................................................................................................... 46
131 18.6.5 Reporting ....................................................................................................... 46
132 19 Large signal characteristics ........................................................................................... 47
133 19.1 Modeling at high amplitudes.................................................................................. 47
134 19.2 Noise Spectrum .................................................................................................... 47
135 19.2.1 Definition and Measurement .......................................................................... 47
136 19.2.2 Reporting ....................................................................................................... 47
137 19.3 Short-term amplitude compression ........................................................................ 48
138 19.3.1 Definition and unit.......................................................................................... 48
139 19.3.2 Setup ............................................................................................................. 48
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IEC CDV 60268-23 IEC:2022 – 5 –
140 19.3.3 Procedure ...................................................................................................... 48
141 19.3.4 Analysis ......................................................................................................... 48
142 19.3.5 Reporting ....................................................................................................... 48
143 19.4 Multi-tone distortion .............................................................................................. 49
144 19.4.1 Multi-tone distortion spectrum ........................................................................ 49
145 19.4.2 Absolute multi-tone distortion ........................................................................ 50
146 19.4.3 Relative multi-tone distortion ......................................................................... 52
147 19.4.4 Total multi-tone distortion ratio ...................................................................... 53
148 19.5 Harmonic Distortion in Sound Pressure Output ..................................................... 53
149 19.5.1 Definition and unit.......................................................................................... 53
150 19.5.2 Setup ............................................................................................................. 55
151 19.5.3 Procedure and analysis ................................................................................. 55
152 19.5.4 Reporting ....................................................................................................... 55
153 19.6 Equivalent input total harmonic distortion .............................................................. 56
154 19.6.1 Definition and unit.......................................................................................... 56
155 19.6.2 Setup ............................................................................................................. 57
156 19.6.3 Procedure ...................................................................................................... 57
157 19.6.4 Analysis ......................................................................................................... 57
158 19.6.5 Reporting ....................................................................................................... 58
159 19.7 Impulsive distortion ............................................................................................... 59
160 19.7.1 Definition and unit.......................................................................................... 59
161 19.7.2 Setup ............................................................................................................. 59
162 19.7.3 Procedure ...................................................................................................... 59
163 19.7.4 Analysis ......................................................................................................... 59
164 19.7.5 Reporting ....................................................................................................... 60
165 19.8 Rated maximum input value .................................................................................. 60
166 19.8.1 Definition and unit.......................................................................................... 60
167 19.8.2 Setup ............................................................................................................. 60
168 19.8.3 Procedure ...................................................................................................... 60
169 19.8.4 Analysis ......................................................................................................... 61
170 19.8.5 Reporting ....................................................................................................... 62
171 19.9 Rated maximum SPL ............................................................................................ 62
172 19.9.1 Definition and unit.......................................................................................... 62
173 19.9.2 Setup ............................................................................................................. 62
174 19.9.3 Procedure ...................................................................................................... 62
175 19.9.4 Reporting ....................................................................................................... 62
176 Bibliography .......................................................................................................................... 64
177178 Figure 1 –Test signal scope .................................................................................................. 14
179 Figure 2 –Recommended position and orientation of the EUT ............................................... 18
180 Figure 3 – Measuring the horizontal directivity in spherical coordinates by rotating the
181 EUT (e.g., OLED TV) in upright position clockwise or anti-clockwise on a turntable .............. 18
182 Figure 4 – Measuring the vertical directivity in spherical coordinates by rotating the
183 tilted EUT (e.g., OLED TV) clockwise or anti-clockwise on a turntable .................................. 18
184 Figure 5 – Example for stand-type ........................................................................................ 20
185 Figure 6 – Example for wall mount-type. ............................................................................... 21
186 Figure 7 – Evaluation point and distance (center) ................................................................. 22
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IEC CDV 60268-23 IEC:2022 – 6 –
187 Figure 8 – SPL distribution of the direct sound represented as the color in 3D space
188 versus coordinates x,y,z generated by a EUT for a sinusoidal input at a selected
189 frequency and input voltage. ................................................................................................. 25
190 Figure 9 – Measurement locations at vertical and horizontal trajectories at distance r ......... 27
191 Figure 10 – Measurement locations at listening window ........................................................ 28
192 Figure 11 – Measurement locations at equivalent sound power ............................................. 29
193 Figure 10 – Example for reporting the directional characteristics measured at distance
194 r . 31195 Figure 11 – Modelling the sound reproduction under in-situ conditions .................................. 32
196 Figure 12 – Example of time-frequency analysis (spectrogram) applied to reflected
197 sound impulse response ht(,r) measured at a distance r=1,5 m from the EUT inREFL
198 an office room ....................................................................................................................... 33
199 Figure 13 – SPL frequency responses of the total in-situ sound, free-field, and
200 reflected sound components measured at a typical listening position in an office. ................. 36
201 Figure 14 – Mean Value of SPL at Rated Frequency Range .................................................. 40
202 Figure 15 – Effective Frequency Range at Frequency Response........................................... 41
203 Figure 16 – Regression line deviation at rated frequency range ............................................ 45
204 Figure 17 – Loudspeaker model considering the dominant signal distortion at high
205 amplitudes ............................................................................................................................ 47
206 Figure 18 – SPL spectrum of the reproduced multi-tone stimulus (MDS) at full FFT
207 resolution comprising the fundamental components at the excited tones and the
208 distortion components at other frequencies. The noise SPL spectrum has been209 measured without exciting the EUT with the stimulus. ........................................................... 50
210 Figure 19 – SPL of the fundamental, multi-tone distortion and noise floor integrated
211 into frequency bands at the excitation frequencies of the multi-tone stimulus. ....................... 51
212 Figure 20 – Relative multi-tone distortion Lf() and relative noise floor Lf() in
RMD i RNF i213 decibel versus excitation frequencies f . ................................................................................ 52
214 Figure 21 – Total harmonic distortion (THD) referred to the fundamental component
215 measured at three distances on the reference axis. .............................................................. 55
216 Figure 22 – SPL frequency responses of the fundamental component, total harmonic
Lf(,r ) Lf(,r )217 components ( ), and the noise floor . .................................................. 56
TH e NFTH e218 Figure 23 – Signal flow chart illustrating the generation of the equivalent input
219 distortion by inverse filtering the sound pressure signal measured at three different
220 points in an in-situ environment (office). ............................................................................... 57
221 Figure 24 – Equivalent input total harmonic distortion (EITHD) in percent versus
222 excitation frequency measured at three distances on the reference axis in an in-situ
223 environment. ............................................................................
...
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