{"id":450769,"date":"2024-10-20T09:14:04","date_gmt":"2024-10-20T09:14:04","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-60268-242024\/"},"modified":"2024-10-26T17:12:01","modified_gmt":"2024-10-26T17:12:01","slug":"bs-en-iec-60268-242024","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-60268-242024\/","title":{"rendered":"BS EN IEC 60268-24:2024"},"content":{"rendered":"

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.<\/p>\n

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2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
6<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
8<\/td>\nFOREWORD <\/td>\n<\/tr>\n
10<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
11<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
12<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
13<\/td>\n4 Measurement method for noise cancelling characteristics
4.1 Characteristics to be specified <\/td>\n<\/tr>\n
14<\/td>\n4.2 Test signals
4.2.1 Pink noise
4.2.2 Simulated ambient noise
Tables
Table 1 \u2013 Power spectrum of simulated aircraft cabin noise <\/td>\n<\/tr>\n
15<\/td>\nFigures
Figure 1 \u2013 Tolerance limit of power spectrum of simulated aircraft cabin noise
Table 2 \u2013 Power spectrum of simulated train compartment noise <\/td>\n<\/tr>\n
16<\/td>\nFigure 2 \u2013 Tolerance limit of power spectrum of simulated train compartment noise
Table 3 \u2013 Power spectrum of simulated cafeteria noise <\/td>\n<\/tr>\n
17<\/td>\n4.3 Nominal environmental conditions
4.3.1 General
4.3.2 Test site
4.3.3 Background noise
Figure 3 \u2013 Tolerance limit of power spectrum of simulated cafeteria noise <\/td>\n<\/tr>\n
18<\/td>\n4.4 Test equipment
4.4.1 Playback equipment for test signals
4.4.2 Acoustic test equipment
4.4.3 Analysis equipment <\/td>\n<\/tr>\n
19<\/td>\n4.5 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 \u2013 Example of noise-cancelling characteristic measurement system <\/td>\n<\/tr>\n
20<\/td>\n4.6 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 <\/td>\n<\/tr>\n
21<\/td>\n4.7.2 Noise suppression ratio <\/td>\n<\/tr>\n
22<\/td>\nAnnex A (normative)Pseudo-diffuse sound field for measurement of ANC headphones
Figure A.1 \u2013 Measurement reference point and sound pressure level confirmation point <\/td>\n<\/tr>\n
24<\/td>\nAnnex B (informative)Example of reporting of data
Figure B.1 \u2013 Example of reporting of insertion loss performance <\/td>\n<\/tr>\n
25<\/td>\nTable B.1 \u2013 Example of reporting of insertion loss performance
Table B.2 \u2013 Example of reporting of noise suppression ratio performance <\/td>\n<\/tr>\n
26<\/td>\nAnnex C (informative)Examples of filter circuits for making simulated ambient noise
Figure C.1 \u2013 Example of filter circuit for making simulated aircraft cabin noise <\/td>\n<\/tr>\n
27<\/td>\nFigure C.2 \u2013 Example of filter circuit for making simulated train compartment noise <\/td>\n<\/tr>\n
28<\/td>\nAnnex D (informative)Procedure for real ear measurements <\/td>\n<\/tr>\n
29<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Sound system equipment – Headphones and earphones. Active acoustic noise cancelling characteristics<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2024<\/td>\n30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":450774,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-450769","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/450769","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/450774"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=450769"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=450769"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=450769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}