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BS EN IEC 60268-24:2024

BS EN IEC 60268-24:2024

$142.49

Sound system equipment – Headphones and earphones. Active acoustic noise cancelling characteristics

Published By Publication Date Number of Pages
BSI 2024 30
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IEC 60268-24:2023 is applicable to active acoustic noise-cancelling headphones and earphones which have the function of reducing the noise heard by the user by the output sound from the transducer generated by the environment noise detection microphone and the noise reduction signal processing circuit. This document specifies the terms and definitions of this type of headphones or earphones, the characteristics to be specified, and the measurement and evaluation methods. The noise detection microphone or microphones are mounted in the body, on the surface, or on an accessory of the headphones or earphones. Signal processing circuits are analogue and digital electronic circuits. This document does not deal with equipment intended for hearing protection. The noise cancelling characteristic measurement methods can be applied to headphones and earphones having no active noise cancelling function.

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PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
12 3 Terms and definitions
13 4 Measurement method for noise cancelling characteristics
4.1 Characteristics to be specified
14 4.2 Test signals
4.2.1 Pink noise
4.2.2 Simulated ambient noise
Tables
Table 1 ā€“ Power spectrum of simulated aircraft cabin noise
15 Figures
Figure 1 ā€“ Tolerance limit of power spectrum of simulated aircraft cabin noise
Table 2 ā€“ Power spectrum of simulated train compartment noise
16 Figure 2 ā€“ Tolerance limit of power spectrum of simulated train compartment noise
Table 3 ā€“ Power spectrum of simulated cafeteria noise
17 4.3 Nominal environmental conditions
4.3.1 General
4.3.2 Test site
4.3.3 Background noise
Figure 3 ā€“ Tolerance limit of power spectrum of simulated cafeteria noise
18 4.4 Test equipment
4.4.1 Playback equipment for test signals
4.4.2 Acoustic test equipment
4.4.3 Analysis equipment
19 4.5 Test procedure for measurement of noise suppression level
4.5.1 Adjustment of sound pressure level of test signals
4.5.2 Sound pressure level measurement at HP-OFF condition
4.5.3 Sound pressure level measurement at ANC-OFF condition
4.5.4 Sound pressure level measurement at ANC-ON condition
Figure 4 ā€“ Example of noise-cancelling characteristic measurement system
20 4.6 Test procedure for measurement of noise suppression loudness
4.6.1 Adjustment of loudness of test signals
4.6.2 Loudness measurement at HP-OFF condition
4.6.3 Loudness measurement at ANC-OFF condition
4.6.4 Loudness measurement at ANC-ON condition
4.7 Reporting of data
4.7.1 Insertion Loss
21 4.7.2 Noise suppression ratio
22 Annex A (normative)Pseudo-diffuse sound field for measurement of ANC headphones
Figure A.1 ā€“ Measurement reference point and sound pressure level confirmation point
24 Annex B (informative)Example of reporting of data
Figure B.1 ā€“ Example of reporting of insertion loss performance
25 Table B.1 ā€“ Example of reporting of insertion loss performance
Table B.2 ā€“ Example of reporting of noise suppression ratio performance
26 Annex C (informative)Examples of filter circuits for making simulated ambient noise
Figure C.1 ā€“ Example of filter circuit for making simulated aircraft cabin noise
27 Figure C.2 ā€“ Example of filter circuit for making simulated train compartment noise
28 Annex D (informative)Procedure for real ear measurements
29 Bibliography

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BS EN IEC 60268-24:2024
$142.49