SIST EN 61937-11:2010

Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 11: MPEG-4 AAC and its extensions in LATM/LOAS (IEC 61937-11:2010)

This part of IEC 61937 describes the method to convey non-linear PCM bitstreams encoded according to the MPEG-4 AAC format and its extensions spectral band replication, parametric stereo and MPEG surround, framed in MPEG-4 LATM/LOAS.

Digitalton - Schnittstelle für nichtlinear-PCM-codierte Audio-Bitströme unter Verwendung von IEC 60958 - Teil 11: MPEG-4-AAC und dessen Erweiterungen in LATM/LOAS (IEC 61937-11:2010)

Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire conformément à la CEI 60958 - Partie 11 : MPEG-4 AAC et ses extensions en ATM/LOAS (CEI 61937-11:2010)

La CEI 61937-11:2010 décrit la méthode à utiliser pour acheminer les flux de bits à codage MIC non-linéaire selon le format MPEG-4 AAC et ses extensions, reconstruction de bandes spectrales, stéréo paramétrique et MPEG ambiophonique, avec des trames en MPEG-4 LATM/LOAS. La présente version bilingue, publiée en 2011-01, correspond à la version anglaise. La version française de cette norme n'a pas été soumise au vote.

Digitalni avdio - Vmesnik za nelinearne PCM-kodirane avdio bitne tokove po IEC 60958 - 11. del: MPEG-4 AAC in njegove razširitve v LATM/LOAS (IEC 61937-11:2010)

Ta del IEC 61937 opisuje metodo za prenos nelinearnih PCM bitnih tokov, kodiranih v skladu z MPEG-4 AAC formatom in njegovimi razširitvami, replikacijo pasu spektra, parametričnega stereo in MPEG prostorskega, znotraj MPEG-4 LATM/LOAS.

General Information

• Status: Published
• Publication Date: 13-Oct-2010
• ICS: 33.160.30 - Audio systems
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Oct-2010
• Due Date: 09-Dec-2010
• Completion Date: 14-Oct-2010
• Ref Project: EN 61937-11:2010 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 11: MPEG-4 AAC and its extensions in LATM/LOAS

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61937-11:2010
01-november-2010
Digitalni avdio - Vmesnik za nelinearne PCM-kodirane avdio bitne tokove po IEC
60958 - 11. del: MPEG-4 AAC in njegove razširitve v LATM/LOAS (IEC 61937-
11:2010)
Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC
60958 - Part 11: MPEG-4 AAC and its extensions in LATM/LOAS (IEC 61937-11:2010)
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YRQ,(&7HLO03(*$$&XQGGHVVHQ(UZHLWHUXQJHQLQ/$70/2$6
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FRQIRUPpPHQWjOD&(,3DUWLH03(*$$&HWVHVH[WHQVLRQVHQ
$70/2$6
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Ta slovenski standard je istoveten z: EN 61937-11:2010
ICS:
33.160.30 Avdio sistemi Audio systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST EN 61937-11:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61937-11:2010

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SIST EN 61937-11:2010

EUROPEAN STANDARD
EN 61937-11

NORME EUROPÉENNE
June 2010
EUROPÄISCHE NORM

ICS 33.160.30; 33.170


English version


Digital audio -
Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 -
Part 11: MPEG-4 AAC and its extensions in LATM/LOAS
(IEC 61937-11:2010)


Audionumérique -  Digitalton – Schnittstelle für nichtlinear-
Interface pour les flux de bits audio PCM-codierte Audio-Bitströme
à codage MIC non linéaire unter Verwendung von IEC 60958 –
conformément à la CEI 60958 - Teil 11: MPEG-4-AAC
Partie 11 : MPEG-4 AAC und dessen Erweiterungen in LATM/LOAS
et ses extensions en LATM/LOAS (IEC 61937-11:2010)
(CEI 61937-11:2010)




This European Standard was approved by CENELEC on 2010-06-01. 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 Central Secretariat 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 Central Secretariat 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61937-11:2010 E

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SIST EN 61937-11:2010
EN 61937-11:2010 - 2 -
Foreword
The text of document 100/1491/CDV, future edition 1 of IEC 661937-11, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61937-11 on 2010-06-01.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-03-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2013-06-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61937-11:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61937 series NOTE  Harmonized in EN 61937 series (not modified).
IEC 61937-6 NOTE  Harmonized as EN 61937-6.
__________

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SIST EN 61937-11:2010
- 3 - EN 61937-11:2010
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60958 Series Digital audio interface EN 60958 Series


IEC 61937-1 - Digital audio - Interface for non-linear PCM EN 61937-1 -
encoded audio bitstreams
applying IEC 60958 -
Part 1: General


IEC 61937-2 - Digital audio - Interface for non-linear PCM EN 61937-2 -
encoded audio bitstreams
applying IEC 60958 -
Part 2: Burst-info


ISO/IEC 14496-3 2009 Information technology - Coding of audio-- -
visual objects -
Part 3: Audio

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SIST EN 61937-11:2010

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SIST EN 61937-11:2010
IEC 61937-11
®
Edition 1.0 2010-05
INTERNATIONAL
STANDARD


Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 11: MPEG-4 AAC and its extensions in LATM/LOAS


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
P
ICS 33.160.30; 33.170 ISBN 978-2-88910-933-3
® Registered trademark of the International Electrotechnical Commission

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SIST EN 61937-11:2010
– 2 – 61937-11 © IEC:2010(E)
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 .8
4 Mapping of the audio bit stream on to IEC 61937-1 .8
4.1 General .8
4.2 Burst-info for MPEG-4 AAC and its extensions in LATM/LOAS .8
5 Format of data-burst for MPEG-4 AAC and its extensions in LATM/LOAS.9
5.1 General .9
5.2 Pause data-bursts for MPEG-4 AAC and its extensions in LATM/LOAS .9
5.3 Audio data-bursts .10
5.3.1 MPEG-4 AAC and its extensions in LATM/LOAS.10
5.3.2 LATM/LOAS framing.12
5.3.3 Latency .12
Annex A (informative) Calculation of delay and data-burst repetition rates, guidelines .14
Bibliography.16

Figure 1 – Data-burst structure .10
Figure 2 – Latency diagram for burst reception and decoding .13

Table 1 – Values for data-type and sub-data-type .9
Table 2 – Repetition period of pause data-bursts .9
Table 3 – Data-type-dependent information .11
Table A.1 – Examples – Calculation of delay and data-burst repetition rates.14

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SIST EN 61937-11:2010
61937-11 © IEC:2010(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 11: MPEG-4 AAC and its extensions in LATM/LOAS


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 61937-11 has been prepared by technical area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/1491/CDV 100/1580/RVC

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 61937-11:2010
– 4 – 61937-11 © IEC:2010(E)
A list of all parts of IEC 61937, under the general title Digital audio – Interface for non-linear
PCM encoded audio bitstreams applying IEC 60958 can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site 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.
A bilingual version of this publication may be issued at a later date.

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SIST EN 61937-11:2010
61937-11 © IEC:2010(E) – 5 –
INTRODUCTION
Modern digital video broadcasting standards such as DVB include support for the MPEG-4
HE AAC and/or HE AAC v2 audio codecs as specified in ISO/IEC 14496-3. An increasing
number of countries are adopting these new codecs for their standard definition and high
definition digital video broadcasting services and have started with implementations.
For MPEG-2 AAC audio (ISO/IEC 13818-7) the specified framing format for the audio bit
stream is ADTS and its transport over an IEC 60958 interface is specified in IEC 61937-6.
However, the MPEG-4 (ISO/IEC 14496-3) audio codecs introduce new features and
capabilities that require a framing format that supports more flexible signaling and delivery
mechanisms. Therefore, MPEG-2 Systems (ISO/IEC 13818-1) specifies the MPEG-4
LATM/LOAS framing format for MPEG-4 audio codecs to overcome the limitations of ADTS.
In order to be able to pass the MPEG-4 audio bit stream from a Set Top Box to an A/V
receiver connected via the IEC 60958 interface without needing to reframe the audio bit
stream within ADTS, the MPEG-4 LATM/LOAS framing format needs to be supported by
IEC 61937.

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SIST EN 61937-11:2010
– 6 – 61937-11 © IEC:2010(E)
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 11: MPEG-4 AAC and its extensions in LATM/LOAS



1 Scope
This part of IEC 61937 describes the method to convey non-linear PCM bitstreams encoded
according to the MPEG-4 AAC format and its extensions spectral band replication, parametric
stereo and MPEG surround, framed in MPEG-4 LATM/LOAS.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60958 (all parts), Digital audio interface
IEC 61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 1: General
IEC 61937-2, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 2: Burst-info
ISO/IEC 14496-3:2009, Information technology – Coding of audio-visual objects – Part 3:
Audio
3 Terms, definitions and abbreviations
For the purposes of this document the terms, definitions and abbreviations of IEC 61937-1,
IEC 61937-2 and the following apply.
3.1 Terms and definitions
3.1.1
access unit
smallest entity to which timing information can be attributed; an access unit is the smallest
individually decodable unit; a decoder consumes access units
3.1.2
AudioMuxElement(1)
LATM element that carries payload data for at least one audio elementary stream, related
payload length information and multiplex configuration information
NOTE This element carries payload data in form of PayloadMux elements. The number in brackets indicates
multiplexing configuration (StreamMuxConfig) is multiplexed into AudioMuxElements, that is in-band transmission.
3.1.3
AudioSpecificConfig
configuration structure used to convey parameters to initialize the MPEG-4 audio decoder

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SIST EN 61937-11:2010
61937-11 © IEC:2010(E) – 7 –
3.1.4
low overhead MPEG-4 audio transport multiplex
LATM
multiplexing layer defined by ISO/IEC 14496-3; used for multiplexing of audio elementary
streams
3.1.5
low overhead audio stream
LOAS
synchronisation layer defined by ISO/IEC 14496-3; three different formats of LOAS are
defined, each of which is designed to address the specific characteristics of the underlying
transmission layer
3.1.6
MPEG-4 AAC profile
contains only the MPEG-4 AAC low complexity audio object type; MPEG-4 AAC low
complexity object type is the counterpart to the MPEG-2 AAC low complexity profile; in
addition to the MPEG-2 AAC LC profile the MPEG-4 AAC low complexity object type enables
the usage of the PNS tool
NOTE The MPEG-4 AAC Low Complexity object type is used when there are restrictions on the usage of RAM
and processing complexity.
3.1.7
MPEG-4 high efficiency AAC profile
contains the spectral band replication object type in conjunction with the MPEG-4 AAC low
complexity object type
NOTE For further information please refer to ISO/IEC 14496-3. The MPEG-4 high efficiency AAC profile is a
superset of the MPEG-4 AAC profile.
3.1.8
MPEG-4 high efficiency AAC profile version 2
contains the parametric stereo object type and the spectral band replication object type in
conjunction with the AAC low complexity object type
N
...