欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    EN 50332-3-2017 en Sound system equipment headphones and earphones associated with personal music players - maximum sound pressure level measurement methodology - Part 3 measuremen.pdf

    • 资源ID:716980       资源大小:2.09MB        全文页数:18页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    EN 50332-3-2017 en Sound system equipment headphones and earphones associated with personal music players - maximum sound pressure level measurement methodology - Part 3 measuremen.pdf

    1、BS EN 50332-3:2017Sound system equipment:headphones and earphonesassociated with personal musicplayers maximum soundpressure level measurementmethodologyPart 3: measurement method for sounddose managementBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 50332-3:2

    2、017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50332-3:2017. The UK participation in its preparation was entrusted to TechnicalCommittee EPL/108, Safety of electronic equipment within thefield of audio/video, information technology and communicationtechnolo

    3、gy.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2017. Published by BSI Stand

    4、ards Limited 2017ISBN 978 0 580 95273 9ICS 17.140.50; 33.160.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2017.Amendments/Corrigenda issued since

    5、publicationDate Text affectedBS EN 50332-3:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50332-3 February 2017 ICS 17.140.50; 33.160.50 English Version Sound system equipment: headphones and earphones associated with personal music players - maximum sound pressure level measurement method

    6、ology - Part 3: measurement method for sound dose management quipements de diffusion sonore: casques et couteurs associs avec un lecteur de musique individuel - Mthode de mesure de niveau maximal de pression acoustique - Partie 3: Mthode de mesure pour la gestion de la dose de bruit Elektroakustisch

    7、e Gerte: Kopfhrer und Ohrhrer in Verbindung mit tragbaren Audiogerten - Verfahren zur Messung des maximalen Schalldruckpegels - Teil 3: Messmethode fr Schalldosis Management This European Standard was approved by CENELEC on 2017-01-02. CENELEC members are bound to comply with the CEN/CENELEC Interna

    8、l Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CE

    9、NELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the offici

    10、al versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Ma

    11、lta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN

    12、-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50332-3:2017 E BS EN 50332-3:2017EN 50332-3:2017 (E) 2 Contents PageEuropean foreword .3 Introduction .4 1 Scope .5 2

    13、 Normative references .5 3 Terms and definitions 5 4 Limits and calibration 5 4.1 General 5 4.2 Headset Type variations 6 4.3 Headset Fit-variation 6 5 Testing .6 5.1 General 6 5.2 Test of PMP with headphones/plugs included 6 5.3 Test of PMP with headphones/plugs not included .7 Annex A (Informative

    14、) Example of how the basic protections could be achieved 9 Annex B (Informative) Background information . 10 B.1 Motivation 10 B.2 Loudness Normalization and EBU R128 . 11 B.3 Explanation of MEL . 11 B.4 Explanation of CSD . 11 B.5 Sound of non-PMP origin . 12 Bibliography . 13 BS EN 50332-3:2017EN

    15、50332-3:2017 (E) 3 European foreword This document (EN 50332-3:2017) has been prepared by CLC/TC/108X “Safety of electronic equipment within the fields of Audio/Video, Information Technology and Communication Technology”. The following dates are fixed: latest date by which this document has tobe imp

    16、lemented at national level bypublication of an identical national standardor by endorsement(dop) 2018-01-02 latest date by which the national standardsconflicting with this document have tobe withdrawn(dow) 2020-01-02 Attention is drawn to the possibility that some of the elements of this document m

    17、ay be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association. BS EN 50332-3:2017EN 50332-3:2017 (E) 4 Introd

    18、uction Ideally, sound exposure assessment should be done with a normalized dosimeter located close to the head (ears) of the user during the whole time of the exposure. However, in the context of leisure activities, and for evident practical and economical reasons, this ideal methodology cannot be a

    19、pplied. For a user of a Personal Music Player (PMP), a dosimeter would even have to sit inside the ear canal, close to the tympanic membrane, with exposure data transformed to diffuse field equivalent. The aim of this European Standard is to define an alternative and more applicable methodology for

    20、estimating sound exposure from PMPs. A PMP should inform the user about potentially harmful sound exposure, long-term as well as short-term. This is accomplished by including a rolling calculation of sound dose, CSD, and an estimation of momentary sound exposure level, MEL. In case CSD or MEL exceed

    21、s defined thresholds, the user is warned and/or PMP gain is lowered. All protections should remain in place when listening to any kind of typical PMP source (music, broadcast, game etc.), but not when, for instance, having a phone call. Annex A shows a block diagram of how a complete protection syst

    22、em might be realized. By adding actual PMP dose estimation to EN 50332-1 and EN 50332-2, rather than assuming the average energy of programs and tracks, warnings become more relevant to the user. Relevance and trustworthiness is essential for one of the standards objectives: its educational value. I

    23、f estimation relies only on feed-forward principles, some uncertainty in the prediction of in vivo dose will persist, for instance how earplugs or headphones are mounted, spread between transducers, spectral properties of transducers, broken transducers etc. Some uncertainties can be effectively dea

    24、lt with when known combinations of PMPs and headphones are employed, while it may add to the uncertainty when components are acquired separately. Regardless that earphones, earbuds or headphones for use with PMPs may not exceed defined limits with regard to sensitivity, it is acknowledged that extra

    25、 uncertainty in the exposure estimation with arbitrary combinations of PMPs and transducers will persist. However, with this part 3, actual electrical measurement of source audio as part of dose estimation, a major contributor to warning errors in general, is eliminated. BS EN 50332-3:2017EN 50332-3

    26、:2017 (E) 5 1 Scope This European Standard specifies sound dose measurement, and the alerts associated, to reduce the risk of listeners developing hearing impairment when using a Personal Music Player (PMP). The standard does not cover exposure from other sources than PMPs. 2 Normative references Th

    27、e following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50332-

    28、1:2013, Sound system equipment: Headphones and earphones associated with personal music players - Maximum sound pressure level measurement methodology - Part 1: General method for “one package equipment“ EN 50332-2:2013, Sound system equipment: Headphones and earphones associated with personal music

    29、 players - Maximum sound pressure level measurement methodology - Part 2: Matching of sets with headphones if either or both are offered separately, or are offered as one package equipment but with standardised connectors between the two allowing to combine components of different manufacturers or d

    30、ifferent design EN 62368-1, Audio/video, information and communication technology equipment - Part 1: Safety requirements (IEC 62368-1:2014) HD 483.1 S2, Sound system equipment - Part 1: General 3 Terms and definitions For the purposes of this document, the terms and definitions of EN 50332-1:2013,

    31、EN 50332-2:2013 and EN 62368-1 apply. 4 Limits and calibration 4.1 General EN 50332-3 builds on definitions from EN 50332-1 and EN 50332-2. Output limits and the calibration of the electro-acoustic loop remain unchanged, but actual audio shall be taken into account to determine maximum and minimum g

    32、ain settings. With the test signal, the relationship between sound exposure level and r.m.s. voltage remains the same, e.g. 80 dB SPL and 15 mV (EN 50332-2), see Figure 1. BS EN 50332-3:2017EN 50332-3:2017 (E) 6 Figure 1 Relationship between SPL and analog output voltage (mV r.m.s.), CSD reference a

    33、nd MEL-based warning; for the standard test signal 4.2 Headset Type variations If a manufacturer implements a means of detecting the sensitivity of a headset plugged in, or provides a user selectable option, this sensitivity can be used to re-calibrate the electro-acoustic loop used for the limits a

    34、nd dose calculation, as long as the acoustic limits remain unchanged. 4.3 Headset Fit-variation If a manufacturer implements a system accounting for headset fit-variation, in which the acoustic level estimates are more accurate than the proposed feed-forward system (for example, a closed-loop or hyb

    35、rid system), these levels can serve as the limits and inputs to the dose calculation, as long as the acoustic limits remain unchanged. 5 Testing 5.1 General This procedure verifies PMP sound exposure and dose estimation, based on the HATS method for acoustic testing, see EN 50332-1. (Five times re-s

    36、eat calibration ref). The “programme simulation” test signal specified in EN 50332-1 and EN 503322 is here referred to as “HD 483”. The same signal, but attenuated by 12 dB, is referred to as “HD 483-12L”. Additional signals and more extensive procedures could be included to test the warning system

    37、rigorously; for example, mark-space ratio noise, test music etc. To keep it simple, however, requirements are based only on continuous noise as described in EN 503321 and 2, as the intentions behind dose estimation should be clear. 5.2 Test of PMP with headphones/plugs included 1) Exposure-based war

    38、ning: Use measurement procedure of EN 50332-1. Play the HD 483 signaland adjust PMP gain control until the MEL warning is just activated. Measure the manikin diffusefield equivalent sound exposure and verify performance to be within tolerances, +- 3 dB.In case PMP maximum SPL is less than 99 dB, no

    39、Exposure-based warning is required.BS EN 50332-3:2017EN 50332-3:2017 (E) 7 2a) Dose estimation: Reset the CSD measurement and adjust the gain for a close to 100 dB SPL diffuse field equivalent measurement. Based on Table 1 and on the SPL measured, verify the time it takes for CSD to reach 100 %. Dur

    40、ation tolerance: +/- 3 dB time equivalents (Table 1). Verify that an appropriate CSD warning is given. 2b) Continue playing and verify that SPL is reduced to 80 dB SPL +/- 3 dB when a CSD of 500 % is reached. Duration tolerance: +/- 3 dB time equivalents (Table 1). In case PMP maximum SPL is less th

    41、an 80 dB, no Dose estimation is required. In case PMP max SPL is between 80 dB and 100 dB, set max PMP gain and use interpolation to verify dose estimates. 3) EBU R128 compatibility (optional): Switch source to HD 483-12L and verify that gain can beturned up high enough to produce SPL greater than o

    42、r equal to 90 dB.5.3 Test of PMP with headphones/plugs not included 1) Exposure warning: Play the HD 483 test signal and adjust PMP gain control until the MEL warningis just activated. Measure the output r.m.s. voltage and verify performance within tolerances,133 mV - 169 mV = +/- 1dB.In case PMP ma

    43、ximum output is less than 133 mV, no Exposure-based warning is required.2a) Dose estimation: Reset the CSD measurement and adjust the gain for a close to 150 mV r.m.s. per channel reading. Based on Table 1 and on the voltage measured, verify the time it takes for CSD to reach 100 %. Duration toleran

    44、ce: +/- 1 dB time equivalents (Table 1). Verify that an appropriate CSD warning is given. 2b) Continue playing and verify that output voltage is reduced to 15 mV +/- 1 dB when a CSD of 500 % is reached. Duration tolerance: +/- 1 dB time equivalents (Table 1). In case the PMPs maximum output voltage

    45、less than or equal to 15 mV, no dose estimation is required. In case the PMPs maximum output voltage is between 15 mV and 150 mV, set max PMP gain and use interpolation to verify dose estimates. 3) EBU R128 compatibility (optional): Switch source to HD 483-12L and verify that the gain can beturned u

    46、p high enough to generate an output voltage of greated than or equal to 47 mV.BS EN 50332-3:2017EN 50332-3:2017 (E) 8 Table 1 Testing of CSD alert, based on SPL or on Electrical Level SPL Analog Level r.m.s. Duration for 100 %CSD Duration for 500 %CSD 103,0 dB(A) 211,9 mV 12 min 59,5 min 102,5 dB(A)

    47、 200,0 mV 13,5 min 67 min 102,0 dB(A) 188,8 mV 15 min 75 min 101,5 dB(A) 178,3 mV 17 min 84 min 101,0 dB(A) 168,3 mV 19 min 94,5 min 100,5 dB(A) 158,9 mV 21 min 106 min 100,0 dB(A) 150,0 mV 23,5 min 119 min 99,5 dB(A) 141,6 mV 26,5 min 133,5 min 99,0 dB(A) 133,7 mV 30 min 150 min 98,5 dB(A) 126,2 mV

    48、 33,5 min 168,5 min 98,0 dB(A) 119,1 mV 37,5 min 189 min 97,5 dB(A) 112,5 mV 42 min 212 min 97,0 dB(A) 106,2 mV 47,5 min 238 min 96,5 dB(A) 100,3 mV 53 min 267,5 min 96,0 dB(A) 94,6 mV 59,5 min 300 min 95,5 dB(A) 89,3 mV 67 min 337 min 95,0 dB(A) 84,4 mV 75 min 378 min 94,5 dB(A) 79,6 mV 84 min 424

    49、min 94,0 dB(A) 75,2 mV 94,5 min 476,5 min 93,5 dB(A) 71,0 mV 106 min 534,5 min 93,0 dB(A) 67,0 mV 119 min 600 min 92,5 dB(A) 63,3 mV 133 min 673,5 min 92,0 dB(A) 59,7 mV 150 min 756 min When testing CSD, this table may be used in case the PMPs gain control does not allow hitting an SPL or voltage level precisely enough. (Duration rounded to 1/2 min values). BS EN 50332-3:2017EN 50332-3:2017 (E) 9 Annex A (Informative) Example of how the basic protections could be achieved To reduce measurement uncertainty, electro-acoustical (“E-A”) tuning should be invoke


    注意事项

    本文(EN 50332-3-2017 en Sound system equipment headphones and earphones associated with personal music players - maximum sound pressure level measurement methodology - Part 3 measuremen.pdf)为本站会员(eveningprove235)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开