Audio, video and multimedia systems - General channel assignment of multichannel audio

IEC 62574:2020 is available as IEC 62574:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62574:2020 specifies the general channel assignment and the metadata for multichannel audio format. This document, with its channel mapping and labelling content, provides the unified usage of channel assignments for source devices, digital audio interfaces and sink devices. The general channel assignment excludes the specification of the exact position of each loudspeaker. The metadata has the exact position of each loudspeaker; however, since the position of the loudspeaker is different in various surround sound formats, the position information of the metadata is not standardized. It is aimed at consumer applications; it is not targeted at theatrical environments. Up to 65 labels for loudspeaker positions and 15 labels for loudspeakers on the display are specified, which can be used for all current multichannel audio formats. The channel assignment concept is room centric and listener centric. This general channel assignment specifies the position of the loudspeaker as seen from the listener.
IEC 62574:2020 cancels and replaces the first edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) model of channel assignment spaces is changed;
b) definition of channel maps and labels is changed;
c) metadata is newly specified;
d) channel maps and labels from the first edition are included in Annex A.

Systèmes audio, vidéo et multimédia - Affectation générale des voies des systèmes audio à voies multiples

IEC 62574:2020 est disponible sous forme de IEC 62574:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 62574:2020 spécifie l'affectation générale des voies et des métadonnées pour le format audio à voies multiples. Le présent document, avec son contenu de mapping et d'étiquetage des voies, uniformise la pratique de l'affectation des voies pour les dispositifs sources, les interfaces audionumériques et les dispositifs récepteurs. L'affectation générale des voies exclut la spécification de la position exacte de chaque haut-parleur. Les métadonnées contiennent la position exacte de chaque haut-parleur; leur information de position n'est toutefois pas normalisée, car la position du haut-parleur est différente dans les divers formats d'ambiophonie. Il est destiné aux applications grand public et non aux salles de spectacle. Jusqu'à 65 étiquettes de positions de haut-parleurs et 15 étiquettes pour les haut-parleurs sur l'affichage sont spécifiées, lesquelles peuvent être utilisées pour tous les formats audio à voies multiples actuels. Le concept d'affectation des voies est centré sur la pièce et centré sur l'auditeur. Cette affectation générale des voies spécifie la position des haut-parleurs telle qu'elle est perçue par l'auditeur.
L'IEC 62574:2020 annule et remplace la première édition parue en 2011. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) le modèle spatial d'affectation des voies est modifié;
b) la définition des mappings ou affectations des voies et leurs étiquettes est modifiée;
c) les métadonnées sont nouvellement spécifiées;
d) les mappings ou affectations des voies et leurs étiquettes de la première édition sont inclus dans l'Annexe A.

General Information

Status
Published
Publication Date
30-Jan-2020
Current Stage
PPUB - Publication issued
Completion Date
31-Jan-2020
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IEC 62574
Edition 2.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio, video and multimedia systems – General channel assignment
of multichannel audio
Systèmes audio, vidéo et multimédia – Affectation générale des voies
des systèmes audio à voies multiples
IEC 62574:2020-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62574
Edition 2.0 2020-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Audio, video and multimedia systems – General channel assignment
of multichannel audio
Systèmes audio, vidéo et multimédia – Affectation générale des voies
des systèmes audio à voies multiples
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.30 ISBN 978-2-8322-7762-1

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
---------------------- Page: 3 ----------------------
– 2 – IEC 62574:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative reference ........................................................................................................ 7

3 Terms and definitions ...................................................................................................... 7

4 General channel assignment ......................................................................................... 16

4.1 General ................................................................................................................. 16

4.2 Model ................................................................................................................... 16

4.3 Channel maps and labels ...................................................................................... 19

5 Metadata ....................................................................................................................... 21

5.1 General ................................................................................................................. 21

5.2 Metadata list ......................................................................................................... 22

5.3 Definition of loudspeaker position ......................................................................... 23

Annex A (normative) Channel maps and labels in edition 1 .................................................. 25

A.1 General ................................................................................................................. 25

A.2 Terms and definitions............................................................................................ 25

A.3 General channel assignment ................................................................................. 29

A.3.1 General ......................................................................................................... 29

A.3.2 The model ..................................................................................................... 29

A.4 Channel maps and labels ...................................................................................... 30

Annex B (informative) Comparison table .............................................................................. 32

B.1 General ................................................................................................................. 32

B.2 Comparison table for each edition of IEC 62574 ................................................... 32

B.3 Comparison table for numbering of the channel .................................................... 33

B.4 Comparison table for surround sound amplifier in consumer market ...................... 34

B.5 Comparison table between this document and ITU-R BS2051-1 ............................ 38

B.6 Comparison table between this document and ITU-R BS2094-1 ............................ 40

B.7 Comparison table between this document and ISO/IEC 23001-8 ........................... 46

Bibliography .......................................................................................................................... 49

Figure 1 – Model of channel spaces ...................................................................................... 17

Figure 2 – Overhead layer .................................................................................................... 17

Figure 3 – High layer ............................................................................................................ 18

Figure 4 – Middle layer ......................................................................................................... 18

Figure 5 – Bottom layer......................................................................................................... 19

Figure 6 – Channel assignment on the display ...................................................................... 19

Figure 7 – Scope of metadata ............................................................................................... 22

Figure 8 – Loudspeaker location ........................................................................................... 23

Figure A.1 – Model of channel spaces .................................................................................. 29

Figure A.2 – Top layer .......................................................................................................... 29

Figure A.3 – Middle layer ...................................................................................................... 30

Figure A.4 – Bottom layer ..................................................................................................... 30

---------------------- Page: 4 ----------------------
IEC 62574:2020 © IEC 2020 – 3 –

Table 1 – General channel assignment ................................................................................. 20

Table 2 – Metadata ............................................................................................................... 23

Table 3 – Definition of loudspeaker angle ............................................................................. 24

Table A.1 – General channel assignment table in IEC 62574:2011 ....................................... 31

Table B.1 – Comparison table for each edition of IEC 62574 ................................................. 32

Table B.2 – Comparison table for numbering of the channel ................................................. 33

Table B.3 – Comparison table for surround sound amplifier in consumer market (1 of 3) ....... 34

Table B.4 – Comparison table between this document and ITU-R BS2051-1 (1 of 2) ............. 38

Table B.5 – Comparison table between this document and ITU-R BS2094-1 (1 of 6) ............. 40

Table B.6 – Comparison table between this document and ISO/IEC 23001-8 (1 of 3) ............ 46

---------------------- Page: 5 ----------------------
– 4 – IEC 62574:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO, VIDEO AND MULTIMEDIA SYSTEMS –
GENERAL CHANNEL ASSIGNMENT OF MULTICHANNEL AUDIO
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

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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.

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rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62574 has been prepared by technical area 20 of IEC technical

committee 100: Audio, video and multimedia systems and equipment.

This second edition cancels and replaces the first edition published in 2011. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) model of channel assignment spaces is changed;
b) definition of channel maps and labels is changed;
c) metadata is newly specified;
d) channel maps and labels from the first edition are included in Annex A.
---------------------- Page: 6 ----------------------
IEC 62574:2020 © IEC 2020 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3198/CDV 100/3246/RVC

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 62574:2020 © IEC 2020
INTRODUCTION

There are many multichannel audio formats and there will be new formats. These formats have

a specific channel assignment, such as a channel mapping and channel labels, but the basic

channel assignments are not so different from each other. These can be unified to one common

channel assignment as the general channel assignment. This general channel assignment

provides audio devices and digital audio interfaces with the usage of unified channel assignments

for any multichannel audio formats. This second edition provides consistency with various

standards. The channel names have changed in this second edition; the differences are shown

in Annex B. Since there are standards that refer to the first edition of this document (see

Clause A.1), IEC 62574:2011 (the first edition) is cited at length in Annex A. The first edition

(IEC 62574:2011) and the second edition (this document) can be distinguished by the numbering

of the channels.
---------------------- Page: 8 ----------------------
IEC 62574:2020 © IEC 2020 – 7 –
AUDIO, VIDEO AND MULTIMEDIA SYSTEMS –
GENERAL CHANNEL ASSIGNMENT OF MULTICHANNEL AUDIO
1 Scope

This document specifies the general channel assignment and the metadata for multichannel

audio format. This document, with its channel mapping and labelling content, provides the unified

usage of channel assignments for source devices, digital audio interfaces and sink devices. The

general channel assignment excludes the specification of the exact position of each loudspeaker.

The metadata has the exact position of each loudspeaker; however, since the position of the

loudspeaker is different in various surround sound formats, the position information of the

metadata is not standardized. It is aimed at consumer applications; it is not targeted at theatrical

environments. Up to 65 labels for loudspeaker positions and 15 labels for loudspeakers on the

display are specified, which can be used for all current multichannel audio formats. The channel

assignment concept is room centric and listener centric. This general channel assignment

specifies the position of the loudspeaker as seen from the listener.
2 Normative reference
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
overhead layer

loudspeaker-layer located vertically above the high layer, nominally near or on the ceiling

(overhead), labelled beginning with the letter designation "Oh"
3.2
high layer

loudspeaker-layer located vertically below the overhead layer and above the middle layer,

nominally located above the screen, or near the ceiling, labelled beginning with the letter

designation "H"
3.3
middle layer

loudspeaker-layer located nominally in the vertical plane at height of the listeners ears, or

alternatively at the centre of the screen, whose labels do not carry a letter designation

3.4
bottom layer

loudspeaker-layer located nominally below the screen, or near the floor, labelled beginning with

the letter designation "Bt"
---------------------- Page: 9 ----------------------
– 8 – IEC 62574:2020 © IEC 2020
3.5
front left
loudspeaker position located at the front left in the middle layer
Note 1 to entry: This note applies to the French language only.
3.6
front right
loudspeaker position located at the front right in the middle layer
Note 1 to entry: This note applies to the French language only.
3.7
front centre

loudspeaker position located at frontal centre in the middle layer, or alternatively corresponding

to the centre of the screen, as viewed from the seating area
Note 1 to entry: This note applies to the French language only.
3.8
low-frequency effects
LFE

sound effects in the low-frequency band, generally below 120 Hz; the LFE channel is not used

as a subwoofer channel to compensate for the low-frequency band of each loudspeaker

Note 1 to entry: When mono LFE is used, it is conveyed in the LFE channel and the LFE loudspeaker's position at

the bottom layer is not defined.
Note 2 to entry: This note applies to the French language only.
3.9
left surround

loudspeaker position located at the left side slightly behind the listener in the middle layer

Note 1 to entry: This note applies to the French language only.
3.10
right surround

loudspeaker position located at the right side slightly behind the listener in the middle layer

Note 1 to entry: This note applies to the French language only.
3.11
front left centre
FLc
loudspeaker position located at the front left of centre in the middle layer
Note 1 to entry: This note applies to the French language only.
3.12
front right centre
FRc
loudspeaker position located at the front right of centre in the middle layer
Note 1 to entry: This note applies to the French language only.
---------------------- Page: 10 ----------------------
IEC 62574:2020 © IEC 2020 – 9 –
3.13
back centre
loudspeaker position located at centre back in the middle layer
Note 1 to entry: This note applies to the French language only.
3.14
low-frequency effects 1
LFE1
LFE loudspeaker position located at the bottom layer and normally far left front
Note 1 to entry: This note applies to the French language only.
3.15
side left
SiL
loudspeaker position located on the left side in the middle layer
Note 1 to entry: This note applies to the French language only.
3.16
side right
SiR
loudspeaker position located on the right side in the middle layer
Note 1 to entry: This note applies to the French language only.
3.17
high front left
HFL
loudspeaker position located at the front left in the high layer
Note 1 to entry: This note applies to the French language only.
3.18
high front right
HFR
loudspeaker position located at the front right in the high layer
Note 1 to entry: This note applies to the French language only.
3.19
high front centre
HFC
loudspeaker position located at front centre in the high layer
Note 1 to entry: This note applies to the French language only.
3.20
overhead centre
OhC

loudspeaker position located at the centre in the overhead layer directly above the seating area

Note 1 to entry: This note applies to the French language only.
3.21
high left surround
HLS

loudspeaker position located at the left slightly behind the listener in the high layer

Note 1 to entry: This note applies to the French language only.
---------------------- Page: 11 ----------------------
– 10 – IEC 62574:2020 © IEC 2020
3.22
high right surround
HRS

loudspeaker position located at the right slightly behind the listener in the high layer

Note 1 to entry: This note applies to the French language only.
3.23
high side left
HSiL
loudspeaker position located on the left side in the high layer
Note 1 to entry: This note applies to the French language only.
3.24
high side right
HSiR
loudspeaker position located on the right side in the high layer
Note 1 to entry: This note applies to the French language only.
3.25
high back centre
HBC
loudspeaker position located at centre back in the high layer
Note 1 to entry: This note applies to the French language only.
3.26
bottom front centre
BtFC
loudspeaker position located at centre front in the bottom layer
Note 1 to entry: This note applies to the French language only.
3.27
bottom front left middle
BtFLmid
loudspeaker position located at the front left in the bottom layer
Note 1 to entry: This note applies to the French language only.
3.28
bottom front right middle
BtFRmid
loudspeaker position located at the front right in the bottom layer
Note 1 to entry: This note applies to the French language only.
3.29
front left wide
FLw
loudspeaker position located at the front far left in the middle layer
Note 1 to entry: This note applies to the French language only.
3.30
front right wide
FRw
loudspeaker position located at the far front right in the middle layer
Note 1 to entry: This note applies to the French language only.
---------------------- Page: 12 ----------------------
IEC 62574:2020 © IEC 2020 – 11 –
3.31
back left
loudspeaker position located at the back left in the middle layer
Note 1 to entry: This note applies to the French language only.
3.32
back right
loudspeaker position located at the back right in the middle layer
Note 1 to entry: This note applies to the French language only.
3.33
left back surround
LBS
loudspeaker position located halfway between LS and BL in the middle layer
Note 1 to entry: This note applies to the French language only.
3.34
right back surround
RBS
loudspeaker position located halfway between RS and BR in the middle layer
Note 1 to entry: This note applies to the French language only.
3.35
high back left
HBL
loudspeaker position located at the back left in the high layer
Note 1 to entry: This note applies to the French language only.
3.36
high back right
HBR
loudspeaker position located at the back right in the high layer
Note 1 to entry: This note applies to the French language only.
3.37
high front left wide
HFLw
loudspeaker position located at the front far left in the high layer
Note 1 to entry: This note applies to the French language only.
3.38
high front Right wide
HFRw
loudspeaker position located at the far front right in the high layer
Note 1 to entry: This note applies to the French language only.
3.39
overhead front left
OhFL
loudspeaker position located at the front left in the overhead layer
Note 1 to entry: This note applies to the French language only.
---------------------- Page: 13 ----------------------
– 12 – IEC 62574:2020 © IEC 2020
3.40
overhead front right
OhFR
loudspeaker position located at the front right in the overhead layer
Note 1 to entry: This note applies to the French language only.
3.41
overhead side left
OhSiL
loudspeaker position located on the left side in the overhead layer
Note 1 to entry: This note applies to the French language only.
3.42
overhead side right
OhSiR
loudspeaker position located on the right side in the overhead layer
Note 1 to entry: This note applies to the French language only.
3.43
overhead back left
OhBL
loudspeaker position located at the back left in the overhead layer
Note 1 to entry: This note applies to the French language only.
3.44
overhead back right
OhBR
loudspeaker position located at the back right in the overhead layer
Note 1 to entry: This note applies to the French language only.
3.45
high front left middle
HFLmid
loudspeaker position located at the front left middle in the high layer
Note 1 to entry: This note applies to the French language only.
3.46
high front right middle
HFRmid
loudspeaker position located at the front right middle in the high layer
Note 1 to entry: This note applies to the French language only.
3.47
high back left middle
HBLmid
loudspeaker position located at the back left middle in the high layer
Note 1 to entry: This note applies to the French language only.
3.48
high back right middle
HBRmid
loudspeaker position located at the back right middle in the high layer
Note 1 to entry: This note applies to the French language only.
---------------------- Page: 14 ----------------------
IEC 62574:2020 © IEC 2020 – 13 –
3.49
front left middle
FLmid
loudspeaker position located at the front left middle in the middle layer
Note 1 to entry: This note applies to the French language only.
3.50
front right middle
FRmid
loudspeaker position located at the front right middle in the middle layer
Note 1 to entry: This note applies to the French language only.
3.51
back left middle
BLmid
loudspeaker position located at the back left middle in the middle layer
Note 1 to entry: This note applies to the French language only.
3.52
back right middle
BRmid
loudspeaker position located at the back right middle in the middle layer
Note 1 to entry: This note applies to the French language only.
3.53
low frequency effects 2
LFE2

LFE loudspeaker position located at the bottom layer and normally far right front, when LFE1 is

used
Note 1 to entry: This note applies to the French language only.
3.54
...

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