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eLibrary > BS EN IEC 60268-24:2024 Sound system equipment - Headphones and earphones. Active acoustic noise cancelling characteristics >

BS EN IEC 60268-24:2024 Sound system equipment - Headphones and earphones. Active acoustic noise cancelling characteristics, 2024

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement method for noise cancelling characteristics [Go to Page]
4.1 Characteristics to be specified
4.2 Test signals [Go to Page]
4.2.1 Pink noise
4.2.2 Simulated ambient noise
Tables [Go to Page]
Table 1 – Power spectrum of simulated aircraft cabin noise
Figures [Go to Page]
Figure 1 – Tolerance limit of power spectrum of simulated aircraft cabin noise
Table 2 – Power spectrum of simulated train compartment noise
Figure 2 – Tolerance limit of power spectrum of simulated train compartment noise
Table 3 – Power spectrum of simulated cafeteria noise
4.3 Nominal environmental conditions [Go to Page]
4.3.1 General
4.3.2 Test site
4.3.3 Background noise
Figure 3 – Tolerance limit of power spectrum of simulated cafeteria noise
4.4 Test equipment [Go to Page]
4.4.1 Playback equipment for test signals
4.4.2 Acoustic test equipment
4.4.3 Analysis equipment
4.5 Test procedure for measurement of noise suppression level [Go to Page]
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 – Example of noise-cancelling characteristic measurement system
4.6 Test procedure for measurement of noise suppression loudness [Go to Page]
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 [Go to Page]
4.7.1 Insertion Loss
4.7.2 Noise suppression ratio
Annex A (normative)Pseudo-diffuse sound field for measurement of ANC headphones [Go to Page]
Figure A.1 – Measurement reference point and sound pressure level confirmation point
Annex B (informative)Example of reporting of data [Go to Page]
Figure B.1 – Example of reporting of insertion loss performance
Table B.1 – Example of reporting of insertion loss performance
Table B.2 – Example of reporting of noise suppression ratio performance
Annex C (informative)Examples of filter circuits for making simulated ambient noise [Go to Page]
Figure C.1 – Example of filter circuit for making simulated aircraft cabin noise
Figure C.2 – Example of filter circuit for making simulated train compartment noise
Annex D (informative)Procedure for real ear measurements
Bibliography [Go to Page]

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