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BS EN IEC 60268-23:2023

BS EN IEC 60268-23:2023

$215.11

Sound system equipment – TVs and monitors. Loudspeaker systems

Published By Publication Date Number of Pages
BSI 2023 72
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 Blank Page
7 English
CONTENTS
12 FOREWORD
14 INTRODUCTION
15 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
16 3.2 Abbreviated terms
17 4 Type description
5 Physical characteristics
5.1 Dimensions
5.2 Mass
6 Conditions
6.1 Normal measuring conditions
Figures
Figure 1 –Test signal scope
18 6.2 Rated conditions
6.3 Rated frequency range
6.4 Climatic conditions
7 Test signals
7.1 General
7.2 Sinusoidal chirp signal
7.3 Steady-state single-tone signal
19 7.4 Steady-state two-tone signal
7.5 Sparse multi-tone complex
7.6 Broadband noise signal
7.7 Narrow-band noise signal
7.8 Hann-burst signal
7.9 Impulsive signal
8 Acoustical environment
8.1 General
8.2 Free-field conditions
8.3 Simulated free-field conditions
20 8.4 In-situ environment
8.5 Listening room
9 Measurement equipment
10 Positioning of the EUT
10.1 Reference plane and normal vector
10.2 Reference point
21 10.3 Reference axis
10.4 Orientation vector
Figure 2 –Recommended position and orientation of the EUT
22 Figure 3 – Measuring the horizontal directivity in spherical coordinates by rotating the EUT (e.g., OLED TV) in upright position
Figure 4 – Measuring the vertical directivity in spherical coordinates by rotating the tilted EUT (e.g. OLED TV)
23 10.5 Horizontal and Vertical Trajectories
11 Measuring distance between EUT and microphone
11.1 Far-field conditions
11.2 Near-field conditions
Tables
Table 1 – Recommended coordinates of the trajectories at distance rD
24 12 Mounting of the EUT
12.1 General
12.2 Mounting methods
12.2.1 Stand-type
12.2.2 Wall mount-type
Figure 5 – Example for stand-type
25 12.3 Mounting for free-field conditions
12.3.1 General
12.3.2 EUT rotating condition
12.3.3 Microphone rotating condition
13 Rated ambient conditions
13.1 Temperature ranges
13.1.1 Performance limited temperature range
Figure 6 – Example for wall mount-type.
26 13.1.2 Damage limited temperature range
13.2 Humidity ranges
13.2.1 Relative humidity range
13.2.2 Damage limited humidity range
14 Evaluation point and distance
14.1 Evaluation point
14.2 Evaluation distance
Figure 7 – Evaluation point and distance (centre)
27 15 Free-field measurements
15.1 General
15.2 On-axis SPL FR
15.2.1 Definition
15.2.2 Measurement methods
15.2.3 Reporting
Table 2 – Evaluation distance reference standard
28 15.3 Spatial transfer function
15.3.1 Definition
15.3.2 Measurement method
29 15.3.3 Reporting
15.4 Sound power response
15.4.1 Definition
Figure 8 – SPL distribution of the direct sound represented in colour in 3D
30 15.4.2 Measurement methods
15.4.3 Reporting
31 15.5 Directional characteristics
15.5.1 General
Figure 9 – Measurement locations at vertical and horizontal trajectories at distance rd
32 15.5.2 Measurement methods
15.5.3 Post-processing
33 Figure 10 – Measurement locations at listening window
34 Figure 11 – Measurement locations at equivalent sound power
Table 3 – Weights for polar angle θ at 10° Increments
35 15.5.4 Reporting
16 In-situ testing
16.1 General
Figure 12 – Example for reporting the directional characteristics measured at distance rd.
36 16.2 In-situ transfer function
16.2.1 Definition
37 16.2.2 Measurement method
Figure 13 – Modelling the sound reproduction under in-situ conditions
38 16.2.3 Reporting
16.3 Room transfer function
16.3.1 Definition
16.3.2 Measurement method
Figure 14 – Example of time-frequency analysis (spectrogram)applied to reflected sound impulse response measured ata distance r = 1,5 m from the EUT in an office room
39 16.4 Reflected sound SPL response
16.4.1 Definition
16.4.2 Measurement method
40 16.4.3 Reporting
16.5 In-situ SPL FR
16.5.1 Definition
16.5.2 Measurement methods
41 16.5.3 Reporting
Figure 15 – SPL FR of the in-situ condition.
42 17 Mean SPL in an acoustical zone
17.1 General
17.2 Definition
43 17.3 Measurement
17.4 Numerical prediction
17.5 Reporting
18 FR characteristics
18.1 General
44 18.2 Mean value of SPL in a rated frequency range
18.2.1 Definition and unit
18.2.2 Setup
18.2.3 Procedure
18.2.4 Analysis
45 18.2.5 Reporting
18.3 Effective frequency range (EFR)
18.3.1 Definition and unit
18.3.2 Setup
18.3.3 Procedure
Figure 16 – Mean value of SPL at rated frequency range
Table 4 – Worked example for mean value of SPL
46 18.3.4 Analysis
18.3.5 Reporting
Figure 17 – Effective Frequency Range at Frequency Response
Table 5 – Worked example for effective frequency range
47 18.4 Spectral balance (SB)
18.4.1 Definition and unit
18.4.2 Setup
18.4.3 Procedure
18.4.4 Analysis
48 18.4.5 Reporting
18.5 Regression line deviation (RLD)
18.5.1 Definition and unit
18.5.2 Setup
18.5.3 Procedure
Table 6 – Worked example for spectral balance
49 18.5.4 Analysis
18.5.5 Reporting
Figure 18 – Regression line deviation at rated frequency range
Table 7 – Worked example for RLD
50 18.6 Narrow band variation (NBV)
18.6.1 Definition and unit
18.6.2 Setup
18.6.3 Procedure
18.6.4 Analysis
51 18.6.5 Reporting
19 Large-signal characteristics
19.1 Modelling at high amplitudes
Figure 19 – Loudspeaker model considering the dominant signal distortion at high amplitudes
Table 8 – Worked example for NBV
52 19.2 Noise spectrum
19.2.1 Definition and measurement
19.2.2 Reporting
19.3 Short-term amplitude compression
19.3.1 Definition and unit
19.3.2 Setup
19.3.3 Procedure
53 19.3.4 Analysis
19.3.5 Reporting
19.4 Multi-tone distortion
19.4.1 Multi-tone distortion spectrum
54 Figure 20 – SPL spectrum of the reproduced multi-tone stimulus (MDS) at full FFT resolution comprising the fundamental components at the excited tones and the distortion components at other frequencies
55 19.4.2 Absolute multi-tone distortion
56 19.4.3 Relative multi-tone distortion
Figure 21 – SPL of the fundamental, multi-tone distortion and noise floor integrated into frequency bands at the excitation frequencies of the multi-tone stimulus
57 19.4.4 Total multi-tone distortion ratio
Figure 22 – Relative multi-tone distortion and relative noise floor in decibel versus excitation frequencies fi.
58 19.5 Harmonic distortion in sound pressure output
19.5.1 Definition and unit
59 19.5.2 Setup
19.5.3 Procedure and analysis
60 19.5.4 Reporting
Figure 23 – Total harmonic distortion (THD) referred to the fundamental component measured at three distances on the reference axis
61 19.6 Equivalent input total harmonic distortion
19.6.1 Definition and unit
Figure 24 – SPL FR of the fundamental component, total harmonic components (), and the noise floor
62 19.6.2 Setup
19.6.3 Procedure
19.6.4 Analysis
Figure 25 – Signal flow chart illustrating the generation of the equivalent input distortion by inverse filtering the sound pressure signal measured at three different points in an in-situ environment (office)
63 19.6.5 Reporting
Figure 26 – Equivalent input total harmonic distortion (EITHD) in percent versus excitation frequency measured at three distances on the reference axis in an in-situ environment
64 19.7 Impulsive distortion
19.7.1 Definition and unit
19.7.2 Setup
19.7.3 Procedure
19.7.4 Analysis
65 19.7.5 Reporting
19.8 Rated maximum input value
19.8.1 Definition and unit
19.8.2 Setup
66 19.8.3 Procedure
67 19.8.4 Analysis
19.8.5 Reporting
19.9 Rated maximum SPL
19.9.1 Definition and unit
19.9.2 Setup
19.9.3 Procedure
Table 9 – Worked example for rated maximum input value
68 Table 10 – A Worked example for Rated maximum SPL

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