Audio reproduction method for normalized loudness level

IEC 62760:2016 specifies the audio reproduction method for normalized loudness level of audio sources for consumer equipment and systems.

Audio-Wiedergabeverfahren für normalisierten Lautstärkepegel

Méthode de reproduction audio pour niveau d'isosonie normalisé

L'IEC 62760:2016 spécifie la méthode de reproduction audio pour le niveau d'isosonie normalisé des sources audio pour les équipements et systèmes grand public.

Metoda zvočnega predvajanja za normalizirano raven glasnosti (IEC 62760:2016)

Ta mednarodni standard določa metodo zvočnega predvajanja za normalizirano raven glasnosti zvočnih virov za potrošniško opremo in sisteme.

General Information

Status
Published
Publication Date
09-Jun-2016
Current Stage
6060 - Document made available
Due Date
25-Jul-2016

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 62760:2016
01-september-2016
0HWRGD]YRþQHJDSUHGYDMDQMD]DQRUPDOL]LUDQRUDYHQJODVQRVWL ,(&
Audio reproduction method for normalized loudness level (IEC 62760:2016)
Audio-Wiedergabeverfahren für normalisierten Lautstärkepegel (IEC 62760:2016)
Méthode de reproduction audio pour niveau d'isosonie normalisé (IEC 62760:2016)
Ta slovenski standard je istoveten z: EN 62760:2016
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
33.160.30 Avdio sistemi Audio systems
SIST EN 62760:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62760:2016
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SIST EN 62760:2016
EUROPEAN STANDARD EN 62760
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2016
ICS 33.160.30
English Version
Audio reproduction method for normalized loudness level
(IEC 62760:2016)

Méthode de reproduction audio pour niveau d'isosonie Audio-Wiedergabeverfahren für normalisierten

normalisé Lautstärkepegel
(IEC 62760:2016) (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 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 CENELEC 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 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, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management 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
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SIST EN 62760:2016
EN 62760:2016
European foreword

The text of document 100/2591/FDIS, future edition 1 of IEC 62760, 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 document has to be implemented at (dop) 2016-12-16
national level by publication of an identical national
standard or by endorsement
(dow) 2019-03-16
• latest date by which the national standards conflicting with
the document have to be withdrawn

Attention is drawn to the possibility that some of the elements 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.

In 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.
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SIST EN 62760:2016
EN 62760:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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 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 62574 - Audio, video and multimedia systems - EN 62574 -
General channel assignment of
multichannel audio
ITU-R 08/2012 Algorithms to measure audio - -
Recommendation programme loudness and true-peak
BS.1770-3 audio level
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SIST EN 62760:2016
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SIST EN 62760:2016
IEC 62760
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio reproduction method for normalized loudness level
Méthode de reproduction audio pour niveau d'isosonie normalisé
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.30 ISBN 978-2-8322-3155-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 62760:2016
– 2 – IEC 62760:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 3

INTRODUCTION ................................................................................................................... 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 General ................................................................................................................. 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 .................................................................................. 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 channel 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 quantity and unit ............................................................................... 17

Table D.1 – Reproduction level ........................................................................................... 22

Table E.1 – Loudness level of samples ................................................................................ 23

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SIST EN 62760:2016
IEC 62760:2016 © IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO REPRODUCTION METHOD FOR
NORMALIZED LOUDNESS LEVEL
FOREWORD

1) The International Electrotechnical Commission (IEC) is a 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 other 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 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 conditions 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 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 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 Publication 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 is 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 technical 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 IEC

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 subject 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 equipment.
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 with the ISO/IEC Directives, Part 2.

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SIST 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. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 62760:2016
IEC 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. Without 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 equipment 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 loudness 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 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.
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SIST EN 62760:2016
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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 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.
IEC 62574, Audio, video and 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 definitions 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 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 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 L and its unit is phon.
3.1.3
gated loudness
numerical value of loudness measured according to ITU‐R BS.1770‐3
Note 1 to entry: Gated loudness is measured in LKFS.
3.1.4
LKFS
loudness, K-weighted, relative to nominal full scale
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IEC 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 French 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 channels

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 range channels and 1 channel of low frequency effect
3.1.9
22.2 channel
stereophonic with 22 full range channels and 2 channels of low frequency effect
3.2 Abbreviations
mono monophonic
stereo stereophonic
4 Loudness normalisation
4.1 General

A system model is defined as specified below. It is applied to the back end of source devices

or the front end of amplifiers.
4.2 System model

Figure 1 describes the system model of reproduction. This model is applied to the appropriate

part of audio devices. For instance, a TV set may apply this model in its final stage of audio

reproduction, an audio amplifier may apply this model in its first stage of audio reproduction.

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SIST EN 62760:2016
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Audio
Channel mode
input
Audio mode
selection
Audio
Reproduced
Output
reference
level control
Metadata
(ur dB)
Downmix
To the gain
detection
gain
control of channel
control
mode
Metadata
(a ~ h dB) (dx dB)
input Downmix
out
Optional
user
control
IEC
Figure 1 – System model
In this model
...

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