ISO/IEC 23003-4:2020/Amd 2:2023
(Amendment)Information technology — MPEG audio technologies — Part 4: Dynamic range control — Amendment 2: Loudness leveling
Information technology — MPEG audio technologies — Part 4: Dynamic range control — Amendment 2: Loudness leveling
Technologies de l'information — Technologies audio MPEG — Partie 4: Contrôle de gamme dynamique — Amendement 2: Égalisation de l’intensité sonore
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INTERNATIONAL ISO/IEC
STANDARD 23003-4
Second edition
2020-06
AMENDMENT 2
2023-10
Information technology — MPEG
audio technologies —
Part 4:
Dynamic range control
AMENDMENT 2: Loudness leveling
Technologies de l'information — Technologies audio MPEG —
Partie 4: Contrôle de gamme dynamique
AMENDEMENT 2: Égalisation de l’intensité sonore
Reference number
ISO/IEC 23003-4:2020/Amd. 2:2023(E)
© ISO/IEC 2023
---------------------- Page: 1 ----------------------
ISO/IEC 23003-4:2020/Amd. 2:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO/IEC 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 23003-4:2020/Amd. 2:2023(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance
are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of document should be noted. This document was drafted in
accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of
any claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC
had not received notice of (a) patent(s) which may be required to implement this document. However,
implementers are cautioned that this may not represent the latest information, which may be obtained
from the patent database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall
not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia, and hypermedia.
A list of all parts in the ISO/IEC 23003 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
iii
© ISO/IEC 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/IEC 23003-4:2020/Amd. 2:2023(E)
Information technology — MPEG audio technologies —
Part 4:
Dynamic range control
AMENDMENT 2: Loudness leveling
Introduction
Replace the fourth sentence in the second paragraph with the following:
The DRC tool includes dedicated sections for clipping prevention, ducking/leveling, and for generating a
fade-in and fade-out to supplement the main dynamic range compression functionality.
6.1.1
Add, before the sentence starting with “For ISO/IEC 14496-12, configuration extension”, the following:
An extension payload of type UNIDRCCONFEXT_V1 shall precede an extension payload of type
UNIDRCCONFEXT_LEVELING in the bitstream if both payloads are present.
6.1.2.4
Replace last three sentences of the first paragraph with:
If the bit for the “Duck other” or the “Duck/Level self” drcSetEffect is set, the DRC set is applied before
any downmix specifi
...
FINAL
AMENDMENT ISO/IEC
DRAFT
23003-
4:2020
FDAM 2
ISO/IEC JTC 1/SC 29
Information technology — MPEG
Secretariat: JISC
audio technologies —
Voting begins on:
2023-07-05
Part 4:
Voting terminates on:
Dynamic range control
2023-08-30
AMENDMENT 2: Loudness leveling
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/IEC 23003-4:2020/FDAM 2:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO/IEC 2023
---------------------- Page: 1 ----------------------
ISO/IEC 23003-4:2020/FDAM 2:2023(E)
FINAL
AMENDMENT ISO/IEC
DRAFT
23003-
4:2020
FDAM 2
ISO/IEC JTC 1/SC 29
Information technology — MPEG
Secretariat: JISC
audio technologies —
Voting begins on:
Part 4:
Voting terminates on:
Dynamic range control
AMENDMENT 2: Loudness leveling
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/IEC 230034:2020/FDAM 2:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
© ISO/IEC 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO/IEC 2023
---------------------- Page: 2 ----------------------
ISO/IEC 23003-4:2020/FDAM 2:2023(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and nongovernmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance
are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of document should be noted. This document was drafted in
accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of
any claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC
had not received notice of (a) patent(s) which may be required to implement this document. However,
implementers are cautioned that this may not represent the latest information, which may be obtained
from the patent database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall
not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understandingstandards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia, and hypermedia.
A list of all parts in the ISO/IEC 23003 series can be found on the ISO and IEC websites
...
ISO/IEC JTC 1/SC 29
Date: 2023-04
ISO/IEC 23003--4:2020/FDAM2:2023(E)FDAmd 2
ISO/IEC JTC 1/SC 29/WG 6
Secretariat: JISC
Date: 2023-06-20
Information technology — MPEG audio technologies — —
Part 4:
Dynamic range control
Amendment
AMENDMENT 2: Loudness leveling
FDIS stage
© ISO/IEC 2023 – All rights reserved
---------------------- Page: 1 ----------------------
ISO/IEC 23003-4:2020/FDAmd 2(E)
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2022 – All rights reserved
ii © ISO/IEC 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 23003-4:2020/FDAM2:202xFDAmd 2(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted. This document was drafted in accordance with the editorial
rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives or
www.iec.ch/members_experts/refdocswww.iec.ch/members_experts/refdocs).
Attention is drawnISO and IEC draw attention to the possibility that some of the elementsimplementation
of this document may beinvolve the subjectuse of (a) patent(s). ISO and IEC take no position concerning
the evidence, validity or applicability of any claimed patent rights. in respect thereof. As of the date of
publication of this document, ISO and IEC had not received notice of (a) patent(s) which may be required
to implement this document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at www.iso.org/patents and
https://patents.iec.ch. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see https://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html. In the IEC, see
www.iec.ch/understanding-standardswww.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information
Technologytechnology, Subcommittee SC 29, Coding of audio, picture, multimedia, and hypermedia.
A list of all parts in the ISO/IEC 23003 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html
and www.iec.ch/national-committeeswww.iec.ch/national-committees.
© ISO/IEC 2022 – All rights reserved iii
© ISO/IEC 2023 – All rights reserved iii
---------------------- Page: 3 ----------------------
DRAFT ISO/IEC 23003-4:2020/FDAM2:2022(E)
Information technology — MPEG audio technologies —
Part 4:
Dynamic range control
Amendment AMENDMENT 2:
Loudness leveling
Introduction
Replace the fourth sentence in the second paragraph with the following:
The DRC tool includes dedicated sections for clipping prevention, ducking/leveling, and for generating a
fade-in and fade-out to supple
...
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