1、Audio reproduction method for normalized loudness levelBS EN 62760:2016BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN 62760:2016. It is identical to IEC 62760:2016.The UK participation in its prep
2、aration was entrusted to TechnicalCommittee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are re
3、sponsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 84247 4ICS 33.160.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStanda
4、rds Policy and Strategy Committee on 30 June 2016.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 62760:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62760 June 2016 ICS 33.160.30 English Version Audio reproduction method for normalized loudness level
5、 (IEC 62760:2016) Mthode de reproduction audio pour niveau disosonie normalis (IEC 62760:2016) Audio-Wiedergabeverfahren fr normalisierten Lautstrkepegel (IEC 62760:2016) This European Standard was approved by CENELEC on 2016-03-16. CENELEC members are bound to comply with the CEN/CENELEC Internal R
6、egulations 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 CENEL
7、EC 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 official
8、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, Malta
9、, the Netherlands, Norway, Poland, Portugal, Romania, 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-CENELEC Ma
10、nagement Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 62760:2016 E BS EN 62760:2016EN 62760:2016 2 European foreword The text of document 100/2591/FDIS, future edition 1 of IEC 62760
11、, prepared by Technical Area 11 “Quality for audio, video and multimedia systems“, of IEC/TC 100 “Audio, video and multimedia systems and equipment“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62760:2016. The following dates are fixed: latest date by which the docume
12、nt has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-12-16 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2019-03-16 Attention is drawn to the possibility that some of the elemen
13、ts of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62760:2016 was approved by CENELEC as a European Standard without any modification. I
14、n the official version, for Bibliography, the following note has to be added for the standard indicated : IEC 61672-1 NOTE Harmonized as EN 61672-1. BS EN 62760:2016EN 62760:2016 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications
15、The 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. NOTE 1
16、When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 62
17、574 - Audio, video and multimedia systems - General channel assignment of multichannel audio EN 62574 - ITU-R Recommendation BS.1770-3 08/2012 Algorithms to measure audio programme loudness and true-peak audio level - - BS EN 62760:2016 2 IEC 62760:2016 IEC 2016 CONTENTS FOREWORD . 3 INTRODUCTION .
18、5 1 Scope 6 2 Normative references. 6 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions 6 3.2 Abbreviations 7 4 Loudness normalisation . 7 4.1 General . 7 4.2 System model . 7 4.3 Control method . 8 4.3.1 Principal control . 8 4.3.2 Optional control . 8 5 Channel mode . 9 5.1 Genera
19、l . 9 5.2 Input source 9 5.3 1 channel mode 10 5.4 2 channel mode 11 5.5 5.1 multichannel stereophonic . 13 5.6 More than 5.1 channels . 13 6 Loudness level diagram . 14 6.1 General . 14 6.2 Reproduction level 14 Annex A (informative) Loudness unit 16 A.1 General . 16 A.2 Loudness quantity and unit
20、16 Annex B (informative) Terms related to audio reproduction . 19 Annex C (informative) Loudness metadata . 21 Annex D (informative) Exception to loudness level diagram 22 Annex E (informative) Example of case 6 . 23 Bibliography . 24 Figure 1 System model 8 Figure 2 Input sources . 10 Figure 3 1 ch
21、annel mode of reproduction 10 Figure 4 2 channel mode of reproduction 12 Figure 5 5.1 channel mode of reproduction . 13 Figure 6 22.2 channel mode for reproduction 14 Figure E.1 Reproduction level with respect to reference loudness level . 23 Table 1 Reproduction level . 15 Table A.1 Loudness quanti
22、ty and unit . 17 Table D.1 Reproduction level . 22 Table E.1 Loudness level of samples 23 BS EN 62760:2016IEC 62760:2016 IEC 2016 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ AUDIO REPRODUCTION METHOD FOR NORMALIZED LOUDNESS LEVEL FOREWORD 1) The International Electrotechnical Commission (IEC) is a
23、 worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to ot
24、her activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the
25、 subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with condition
26、s determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National
27、 Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in
28、 which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Pub
29、lication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC i
30、s not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its te
31、chnical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other I
32、EC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the sub
33、ject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62760 has been prepared by technical area 11: Quality for audio, video and multimedia systems, of IEC technical committee 100: Audio, video and multimedia systems and eq
34、uipment. The text of this standard is based on the following documents: FDIS Report on voting 100/2591/FDIS 100/2635/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance
35、 with the ISO/IEC Directives, Part 2. BS EN 62760:2016 4 IEC 62760:2016 IEC 2016 The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication.
36、At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 62760:2016IEC 62760:2016 IEC 2016 5 INTRODUCTION The loudness level of audio reproduction varies according to the level of the input source and whether it is mono, stereo or multichannel. W
37、ithout a suitable form of automatic control, users are forced to adjust the volume level of equipment to obtain an appropriate loudness level when the user selects another audio source or audio mode such as mono, stereo or downmix. There are some specific adjustment methods applied to consumer equip
38、ment but these methods are not standardized. For broadcast audio, broadcasting studios apply loudness level measurements and settle a reference level for their audio content depending on ITU-R BS.1770 and ITU-R BS.1864, the first standardisation work for loudness level in broadcasting. The audio lou
39、dness levels of other services are also expected to be standardized. Broadcast audio with regulated loudness levels can be reproduced correctly with appropriately-configured reproduction systems and equipment. This International Standard specifies the method for reproduction with channel mode level
40、setting and other level settings, and provides improved quality of listening for users. This method is also applicable for various audio content other than broadcasting audio. This International Standard is applicable to electrical signal levels and excludes acoustic audio levels from loudspeakers.
41、BS EN 62760:2016 6 IEC 62760:2016 IEC 2016 AUDIO REPRODUCTION METHOD FOR NORMALIZED LOUDNESS LEVEL 1 Scope This International Standard specifies the audio reproduction method for normalized loudness level of audio sources for consumer equipment and systems. 2 Normative references The following docum
42、ents, 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. IEC 62574, Audio, video an
43、d multimedia systems General channel assignment of multichannel audio ITU-R BS.1770-3:08/2012, Algorithms to measure audio programme loudness and true-peak audio level 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definiti
44、ons apply. 3.1.1 loudness subjective notion describing the magnitude of the perception of the sound by the human sense of hearing Note 1 to entry: The magnitude of the auditory sensation mainly depends on sound pressure, it differs with frequency and sustain time of sound (see ISO 226:2003). Note 2
45、to entry: The loudness is based on a sound that is pure tone of 40 dB sound pressure level and 1 kHz frequency, whose level is defined as 1 sone. Its symbol is N. 3.1.2 loudness level level of a sound equal to the sound pressure level of 1 kHz sine wave Note 1 to entry: The loudness level is sensed
46、by humans as equal to the subjective sound level. The reference is 1 kHz sine wave and 40 dB sound pressure level, its loudness level is 40 phon. Note 2 to entry: The symbol for loudness level is LNand its unit is phon. 3.1.3 gated loudness numerical value of loudness measured according to ITUR BS.1
47、7703 Note 1 to entry: Gated loudness is measured in LKFS. 3.1.4 LKFS loudness, K-weighted, relative to nominal full scale BS EN 62760:2016IEC 62760:2016 IEC 2016 7 Note 1 to entry: LKFS is a unit whose value is defined in ITU-R Recommendation BS.1770-3. Note 2 to entry: This note applies to the Fren
48、ch language only. 3.1.5 monophonic sound processing by a single channel Note 1 to entry: Monophonic is a mode of recording audio with one microphone or an equivalent method, transferring through one channel, then reproducing with one loudspeaker. 3.1.6 dual mono consisting of two mono signal channel
49、s Note 1 to entry: Dual mono is a mode of recording audio with two independent monophonic sounds, transferring through two channels, then reproducing one of two signals. 3.1.7 stereophonic sound processing by two or more related channels Note 1 to entry: Stereophonic is a mode of recording audio with two or more microphones or an equivalent method, transferring through two or more channels, then reproducing with two or more loudspeakers. 3.1.8 5.1 channel stereophonic with 5 full
