IEC 61937-2:2007

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

IEC 61937-2:2007 specifies the digital audio interface to convey non-linear PCM encoded audio bitstreams applying IEC 60958-1 and IEC 60958-3. This standard specifies burst-info which defines content information about the data contained in the burst payload. This second edition cancels and replaces the first edition published in 2000. This edition contains the following significant technical changes with respect to the previous edition:
a) New audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling frequency, MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional and MAT are added.
b) Data-type field in Pc is expanded from bit 0-4 to 0-6. This bilingual version corresponds to the monolingual English version, published in 2007-05.

Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire conformément à la CEI 60958 - Partie 2: Salve d'informations

La CEI 61937-2:2007 spécifie l'interface audionumérique pour acheminer des flux de bits audio à codage MIC non linéaire conformément à la CEI 60958-1 et à la CEI 60958-3. La présente norme spécifie la salve d'information qui définit le contenu d'informations sur les données contenues dans la charge-utile de salve. Cette deuxième édition annule et remplace la première édition publiée en 2000. La présente édition contient les importantes modifications techniques suivantes par rapport à l'édition précédente:
a) Les nouveaux types-de-données audio AC-3 amélioré, MPEG-2 AAC faible fréquence d'échantillonnage, MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional et MAT sont ajoutés.
b) Le champ type-de-données dans Pc est étendu des bits 0 à 4 aux bits 0 à 6. La présente version bilingue correspond à la version anglaise monolingue publiée en 2007-05.

General Information

• Status: Published
• Publication Date: 22-May-2007
• ICS: 33.160.30 - Audio systems
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: DELPUB - Deleted Publication
• Start Date: 08-Mar-2021
• Completion Date: 31-Jan-2020

Relations

• Amended By: IEC 61937-2:2007/AMD1:2011 - Amendment 1 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023
• Amended By: IEC 61937-2:2007/AMD2:2018 - Amendment 2 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023
• Revises: IEC 61937-2:2003 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023
• Revises: IEC 61937-2:2003/COR1:2004 - Corrigendum 1 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023
• Revised: IEC 61937-2:2021 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023

Overview

IEC 61937-2:2007 defines the burst-info portion of the digital audio interface used to convey non-linear PCM encoded audio bitstreams over IEC 60958 (S/PDIF/consumer digital audio) links. The standard specifies how content information about a burst payload is encoded so receiving equipment can identify and correctly process compressed audio formats. This consolidated edition includes Amendments 1 and 2 (up to 2018), adding modern audio data-types (e.g., enhanced AC‑3, MPEG‑4 AAC, DTS type IV, ATRAC‑X, WMA Professional, MAT, MPEG‑H, AC‑4) and expanding the data-type field to bits 0–6.

Key Topics

• Burst-info structure and fields: Defines the fields that describe the burst payload (see Table 1 in the standard). Burst-info conveys metadata required to interpret the following audio data-burst.
• Data-type and subdata-type: Classification of payload formats. The data-type field was expanded (bits 0–6) to support additional codecs and future extensions.
• Audio data-bursts: Rules and formats for encapsulating non-linear PCM bitstreams (examples include AC‑3, enhanced AC‑3, MPEG audio, MPEG‑2/4 AAC, DTS types, ATRAC family, WMA Professional, MAT, MPEG‑H, AC‑4).
• Normative references and interoperability: Cross-references to IEC 60958-1 and IEC 60958-3 and other parts of the IEC 61937 series that define codec-specific payload structure.
• Amendments and evolution: Addition of new data-types and clarifications to ensure consistency with IEC 61937-1 and codec extensions.

Applications

• Audio/video equipment design: AV receivers, soundbars, TVs, set-top boxes and Blu‑ray players use IEC 61937-2 to embed compressed audio over digital audio interfaces.
• Firmware, driver and DSP development: Ensures correct identification and routing of compressed streams to decoders.
• Test, certification and compliance: Test labs and QA engineers use burst-info rules to validate interoperability across devices and formats.
• System integration and pro audio: Integrators and manufacturers employ the standard when transporting multi-channel or next‑generation audio formats over S/PDIF and other IEC 60958 links.

Who should use this standard

• Hardware manufacturers (consumer and professional audio)
• Firmware/firmware‑interface developers and codec implementers
• Test laboratories and compliance engineers
• Standards committees and system integrators

Related Standards

• IEC 60958-1 / IEC 60958-3 (digital audio interface basics and consumer applications)
• IEC 61937-1, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14 (other parts of the IEC 61937 series for codec-specific bitstreams)

Keywords: IEC 61937-2, digital audio, burst-info, IEC 60958, non-linear PCM, S/PDIF, data-type, AC‑3, AAC, DTS, ATRAC, WMA Professional, MAT, MPEG‑H, AC‑4, audio interface, interoperability.

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 61937-2
Second edition
2007-05
Digital audio – Interface for non-linear
PCM encoded audio bitstreams
applying IEC 60958 –
Part 2:
Burst-info
Reference number
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

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INTERNATIONAL IEC
STANDARD 61937-2
Second edition
2007-05
Digital audio – Interface for non-linear
PCM encoded audio bitstreams
applying IEC 60958 –
Part 2:
Burst-info
PRICE CODE
Commission Electrotechnique Internationale L
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 61937-2 © IEC:2007(E)
CONTENTS
FOREWORD.3

1 Scope.5

2 Normative references .5

3 Terms, definitions and abbreviations .6

3.1 Terms and definitions .6

3.2 Abbreviations .7

4 Burst-info .7
4.1 General .7
4.2 Data-type and subdata-type .7
4.3 Audio data-bursts .9
4.3.1 General .9
4.3.2 AC-3.9
4.3.3 MPEG-1 layer-1.9
4.3.4 MPEG-1 layer-2 or -3 or MPEG-2 without extension .9
4.3.5 MPEG-2 with extension .9
4.3.6 MPEG-2 AAC .9
4.3.7 MPEG-2 layer-1 low sampling frequency .9
4.3.8 MPEG-2 layer-2 low sampling frequency .10
4.3.9 MPEG-2 layer-3 low sampling frequency .10
4.3.10 DTS type I .10
4.3.11 DTS type II .10
4.3.12 DTS type III .10
4.3.13 DTS type IV.10
4.3.14 ATRAC .10
4.3.15 ATRAC 2/3 .10
4.3.16 ATRAC-X.10
4.3.17 MPEG-2 AAC low sampling frequency .10
4.3.18 MPEG-4 AAC .11
4.3.19 Windows Media Audio professional.11
4.3.20 Enhanced AC-3 .11
4.3.21 MAT .11

Table 1 – Fields of burst-info .7
Table 2 – Data-types .8

61937-2 © IEC:2007(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED

AUDIO BITSTREAMS APPLYING IEC 60958

Part 2: Burst-info
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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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 61937-2 has been prepared by Technical Area 4, of IEC technical
committee 100: Audio, video and multimedia systems and equipment.
This second edition of IEC 61937-2 cancels and replaces the first edition published in 2000.
This edition contains the following significant technical changes with respect to the previous
edition.
a) New audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling frequency,
MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional and MAT are added.
b) Data-type field in Pc is expanded from bit 0-4 to 0-6.

– 4 – 61937-2 © IEC:2007(E)
The text of this standard is based on the following documents:

CDV Report on voting
100/1115/CDV 100/1221/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.

The list of all the parts of the IEC 61937 series, 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 maintenance result 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.

61937-2 © IEC:2007(E) – 5 –
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED

AUDIO BITSTREAMS APPLYING IEC 60958

Part 2: Burst-info
1 Scope
This part of IEC 61970 specifies the digital audio interface to convey non-linear PCM encoded
audio bitstreams applying IEC 60958-1 and IEC 60958-3. This standard specifies burst-info
which defines content information about the data contained in the burst payload.
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 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 1: General
IEC 61937-3, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 3: Non-linear PCM bitstreams according to the AC-3 format
IEC 61937-4, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 4: Non-linear PCM bitstreams according to the MPEG audio formats
IEC 61937-5, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater
Systems) format(s)
IEC 61937-6, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying

IEC 60958 – Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC and MPEG-4
AAC formats
IEC 61937-7, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and
ATRAC-X formats
IEC 61937-8, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 8: Non-linear PCM bitstreams according to the Windows Media Audio
(WMA) Professional format
IEC 61937-9, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 9: Non-linear PCM bitstreams according to the MAT format
—————————
To be published.
– 6 – 61937-2 © IEC:2007(E)
ISO/IEC 11172-3: Information technology – Coding of moving pictures and associated audio

for digital storage media at up to about 1,5 Mb/s – Part 3: Audio

ISO/IEC 13818-3, Information technology – Generic coding of moving pictures and associated

audio information – Part 3: Audio

ISO/IEC 13818-7, Information technology – Generic coding of
...

IEC 61937-2 ®
Edition 2.2 2018-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC 61937-2 ®
Edition 2.2 2018-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.30 ISBN 978-2-8322-5518-6

IEC 61937-2 ®
Edition 2.2 2018-03
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
– 2 – IEC 61937-2:2007+AMD1:2011
+AMD2:2018 CSV  IEC 2018
CONTENTS
FOREWORD . 3
INTRODUCTION to Amendment 1 . 5
INTRODUCTION to Amendment 2 . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Burst-info . 8
4.1 General . 8
4.2 Data-type and subdata-type . 9
4.3 Audio data-bursts . 12
4.3.1 General . 12
4.3.2 AC-3 . 12
4.3.3 MPEG-1 layer-1 . 12
4.3.4 MPEG-1 layer-2 or layer-3 or MPEG-2 without extension . 12
4.3.5 MPEG-2 with extension . 13
4.3.6 MPEG-2 AAC . 13
4.3.7 MPEG-2 layer-1 low sampling frequency . 13
4.3.8 MPEG-2 layer-2 low sampling frequency . 13
4.3.9 MPEG-2 layer-3 low sampling frequency . 13
4.3.10 DTS type I . 13
4.3.11 DTS type II . 13
4.3.12 DTS type III . 13
4.3.13 DTS type IV . 13
4.3.14 ATRAC . 14
4.3.15 ATRAC 2/3 . 14
4.3.16 ATRAC-X . 14
4.3.17 MPEG-2 AAC low sampling frequency . 14
4.3.18 MPEG-4 AAC . 14
4.3.19 Windows Media Audio professional. 14
4.3.20 Enhanced AC-3 . 14
4.3.21 MAT . 14
4.3.22 MPEG-4 ALS . 15
4.3.23 MPEG-4 AAC LC in LATM/LOAS . 15
4.3.24 MPEG-4 HE AAC in LATM/LOAS . 15
4.3.25 DRA . 15
4.3.26 ATRAC-X low latency . 15
4.3.27 MPEG-H 3D Audio . 15
4.3.28 AC-4, AC-4 HBR4, AC-4 HBR16 and AC-4 LD . 16
4.3.29 MPEG-4 ALS in LATM/LOAS . 16
Bibliography . 17

Table 1 – Fields of burst-info . 9
Table 2 – Data-types . 9

+AMD2:2018 CSV  IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 2: Burst-info
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.
This consolidated version of the official IEC Standard and its amendments has been prepared
for user convenience.
IEC 61937-2 edition 2.2 contains the second edition (2007-05) [documents 100/1115/CDV and
100/1221/RVC], its amendment 1 (2011-10) [documents 100/1811/CDV and 100/1884/RVC] and its
amendment 2 (2018-03) [documents 100/2944/CDV and 100/3032/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendments 1 and 2. Additions are in green text, deletions are in strikethrough red
text. A separate Final version with all changes accepted is available in this publication.

– 4 – IEC 61937-2:2007+AMD1:2011
+AMD2:2018 CSV  IEC 2018
International Standard IEC 61937-2 has been prepared by technical area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
a) New audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling frequency,
MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional and MAT are added.
b) Data-type field in Pc is expanded from bit 0-4 to 0-6.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all the parts of the IEC 61937 series, 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 the base publication and its amendments 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
+AMD2:2018 CSV  IEC 2018
INTRODUCTION to Amendment 1
The revision of IEC 61937-2 (2007) has become necessary to define additional data types, in
order to be consistent with the data-type field description in IEC 61937-1 and to clarify the
rule and definition of this data-type. Amendment 1 contains the following significant technical
changes with respect to the base publication (IEC 61937-2, second edition).
– New audio data-types of MPEG-4 ALS, MPEG-4 AAC LC in LATM/LOAS, MPEG-4 HE
AAC in LATM/LOAS and DRA are added.
– The description of data-type and subdata-type fields in Pc is clarified.
– A rule has been defined for new data-types.

INTRODUCTION to Amendment 2
The revision of IEC 61937-2:2007 has become necessary to define additional data types.
Amendment 2 contains the following significant technical changes with respect to the base
publication (IEC 61937-2:2007 and IEC 61937-2:2007/AMD1:2011):
a) new audio data-types of ATRAC-X low latency, MPEG-H 3D Audio, MPEG-H 3D Audio
HBR, AC-4, AC-4 HBR4, AC-4 HBR16, AC-4 LD and MPEG-4 ALS in LATM/LOAS are
added;
b) units of Pd column is added to Table 2;
c) update SMPTE reference.
In the next full revision of IEC 61937-2, it is planned to relinquish the use of "Conventional
data-type" and "Subdata-type", replacing them with "data-type bits 0 to 4" and "data-type bits
5 to 6", respectively.
– 6 – IEC 61937-2:2007+AMD1:2011
+AMD2:2018 CSV  IEC 2018
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 2: Burst-info
1 Scope
This part of IEC 61937 specifies the digital audio interface to convey non-linear PCM encoded
audio bitstreams applying IEC 60958-1 and IEC 60958-3. This standard specifies burst-info
which defines content information about the data contained in the burst payload.
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 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 61937-1:2007, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 1: General
IEC 61937-3, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 3: Non-linear PCM bitstreams according to the AC-3 format
IEC 61937-4, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 4: Non-linear PCM bitstreams according to the MPEG audio format
IEC 61937-5, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater
Systems) format(s)
IEC 61937-6, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC and MPEG-4
AAC audio formats
IEC 61937-7, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and
ATRAC-X formats
IEC 61937-8:2006, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 8: Non-linear PCM bitstreams according to the Windows Media
Audio (WMA) Professional format
IEC 61937-9, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 9: Non-linear PCM bitstreams according to the MAT format
—————————
To be published.
+AMD2:2018 CSV  IEC 2018
IEC 61937-10, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 10: Non-linear PCM bitstreams according to the MPEG-4 audio
lossless coding (ALS) format
IEC 61937-11, 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 61937-12, Digital audio – Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 – Part 12: Non-linear PCM bitstreams according to the DRA formats
IEC 61937-13, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 13: MPEG-H 3D Audio
IEC 61937-14, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 14: Non-linear PCM bitstreams according to the AC-4 format
ISO/IEC 11172-3: Information technology – Coding of moving pictures and associated audio
for digital storage media at up to about 1,5 Mb/s – Part 3: Audio
ISO/IEC 13818-3, Information technology – Generic coding of moving pictures and associated
audio information – Part 3: Audio
ISO/IEC 13818-7, Information technology – Generic coding of moving pictures and associated
audio information – Advanced Audio Coding (AAC)
ISO/IEC 14496-3, Information technology – Coding of audio-visual objects – Part 3: Audio
ITU-R Recommendation BS.1196, Audio coding for digital terrestrial television broadcasting
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
audio data-burst data-burst with an encoded audio frame as burst-payload
audio data-word 16-bit data word
audio frame fixed number of audio samples. The number of samples in an audio
frame is dependent on the particular encoding system which is
used to encode the audio frame into the encoded audio frame
audio gap period in the sequence of baseband audio samples where valid
samples of audio are not available
bitstream non-linear PCM encoded audio source, represented in a sequence
of bits. In this interface the bitstream consists of a sequence of
data-bursts
data-burst packet of data, including the burst-preamble, to be transmitted
across the interface
burst-payload information content of the data-burst
burst-preamble header for the data-burst, containing synchronization and
information about the data contained in the burst-payload
data-type reference to the type of payload of the data-bursts
encoded audio frame minimum decodable unit of an encoded data sequence. Each
encoded audio frame is the encoded representation of a fixed
number of audio samples (for each original audio channel). The
number of samples which are encoded into an encoded audio

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frame depends on the particular encoding system which is used to
encode the audio frame into the encoded audio frame
length-code length of the data-burst-payload in bits, bytes or 8-bytes
repetition period period between the reference point of the current data-burst, and
the reference point of the immediately following data-burst of the
same data-type
sampling frequency sampling frequency of the encoded PCM audio samples (i.e. before
encoding and after decoding)
sampling period period related to the sampling frequency of the PCM audio
samples, represented in the encoded bitstream
stuffing occupying the unused data capacity of the interface
stuffing sub-frame occupying the unused data capacity in 16-bit audio data words
stream gap period within the encoded audio bitstream without any audio frame;
a discontinuity in the bitstream. Typically, a stream gap will occur
between encoded audio frames
3.2 Abbreviations
ATRAC Adaptive TRansform Acoustic Coding
ATRAC2 Adaptive TRansform Acoustic Coding 2
ATRAC3 Adaptive TRansform Acoustic Coding 3
ATRAC2/3 ATRAC2 and/or ATRAC3
ATRAC-X Adaptive TRansform Acoustic Coding-X
ATSC Advanced Television Systems Committee
IEC International Electrotechnical Commission
ISO/IEC MPEG Moving Pictures Expert Group, a joint committee of ISO and IEC
ITU-R International Telecommunication Union, Radiocommunication
Bureau
MPEG Motion Pictures Expert Group, a joint committee of ISO and IEC
SMPTE Society of Motion Picture and Television Engineers
4 Burst-info
4.1 General
The 16-bit burst-info contains information about the data which will be found in the data-burst.
Fields of burst-info is specified in Table 1.

+AMD2:2018 CSV  IEC 2018
Table 1 – Fields of burst-info
Bits of
Value Contents
Pc
0-6 Data-type (defined in IEC 61937-1)
0-4 Conventional data-type
0-31 See Table 2
5-6 Subdata-type
0-3 See Table 2
7 Error-flag
0 Error-flag indicating a valid burst-payload
1 Error-flag indicating that the burst-payload may contain errors
8-12 Data-type-dependent info
13-15 0-7 Bit-stream-number
NOTE Refer to IEC 61937-1, 6.1.7 and 6.1.7.1.

4.2 Data-type and subdata-type
Data-type defined in PC bits 0-6 in IEC 61937-1 consists of conventional data-type (0-4) and
subdata-type (5-6) for historical reasons. All conventional data-types and subdata-types are
defined in Table 2.
Any combination of data-type and subdata-type which is not defined in Table 2 shall not be
transmitted.
Further definition of data-type in the reserved area of Table 2 shall be allocated in PC bits 0-6,
in ascending order and without skipping gap.
Table 2 – Data-types
Data- Subdata-
Contents Reference Repetition
type type
point R period of data-
burst measured
Value of Value of
in IEC 60958
PC bit PC bit
frames
0-4 5-6
0 0 Null data See Note 1
1 0 AC-3 data R-AC-3 1 536
2 0 – 3 Refer to SMPTE 338M
3 0 Pause bit 0 of Pa See Note 2
4 0 MPEG-1 layer 1 data bit 0 of Pa 384
5 0 MPEG-1 layer 2 or 3 data or MPEG-2 without bit 0 of Pa 1 152
extension
6 0 MPEG-2 data with extension bit 0 of Pa 1 152
7 0 MPEG-2 AAC bit 0 of Pa 1 024
8 0 MPEG-2, layer-1 low sampling frequency bit 0 of Pa 768
9 0 MPEG-2, layer-2 low sampling frequency bit 0 of Pa 2 304
10 0 MPEG-2, layer-3 low sampling frequency bit 0 of Pa 1 152
11 0 DTS type I bit 0 of Pa 512
12 0 DTS type II bit 0 of Pa 1 024

– 10 – IEC 61937-2:2007+AMD1:2011
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13 0 DTS type III bit 0 of Pa 2 048
14 0 ATRAC bit 0 of Pa 512
15 0 ATRAC 2/3 bit 0 of Pa 1 024
16 0 ATRAC-X bit 0 of Pa 2 048
17 0 DTS type IV bit 0 of Pa See IEC 61937-5
18 0 WMA professional type I bit 0 of Pa *3 2 048
1 WMA professional type II bit 0 of Pa 2 048
2 WMA professional type III bit 0 of Pa 1 024
3 WMA professional type IV bit 0 of Pa 512
19 0 MPEG-2 AAC low sampling frequency bit 0 of Pa 2 048
1 MPEG-2 AAC low sampling frequency bit 0 of Pa 4 096
2 – 3 MPEG-2 AAC low sampling frequency reserved reserved
20 0 MPEG-4 AAC bit 0 of Pa 1 024
1 MPEG-4 AAC bit 0 of Pa 2 048
2 MPEG-4 AAC bit 0 of Pa 4 096
3 MPEG-4 AAC bit 0 of Pa 512
21 0 Enhanced AC-3 bit 0 of Pa 6 144
1 – 3 Reserved reserved reserved
22 0 MAT R-MAT 15 360
1 – 3 Reserved reserved reserved
23 – 26 0 – 3 Reserved
27 – 30 0 – 3 Refer to SMPTE 338M
31 0 – 3 Extended data-type (not use until defined)
NOTE 1 Refer to IEC 61937-1, 7.3.
NOTE 2 The repetition period of pause data-bursts depends on the application. The repetition period of
pause data-bursts is defined for each audio data-burst.
NOTE 3 Refer to IEC 61937-8, 4.2.

Data-type Contents Reference Repetition Units of Pd
value of Pc bit 0 to 6 point R period of
data-burst
Conventional Subdata-
measured in
data-type type
IEC 60958
Value of data- Value of frames
type bits data-
type bits
0 to 4
5 to 6
a
0 0 Null data
1 0 AC-3 data R-AC-3 1 536 bits
2 0 – 3 Refer to SMPTE ST 338  bits
b
3 0 Pause bit 0 of Pa bits
4 0 MPEG-1 layer 1 data bit 0 of Pa 384 bits
MPEG-1 layer 2 or 3 data or bits
5 0 bit 0 of Pa 1 152
MPEG-2 without extension
6 0 MPEG-2 data with extension bit 0 of Pa 1 152 bits
7 0 MPEG-2 AAC bit 0 of Pa 1 024 bits
MPEG-2, layer-1 low sampling bits
8 0 bit 0 of Pa 768
frequency
MPEG-2, layer-2 low sampling bits
9 0 bit 0 of Pa 2 304
frequency
+AMD2:2018 CSV  IEC 2018
Contents Units of Pd
Data-type Reference Repetition
value of Pc bit 0 to 6 point R period of
data-burst
Conventional Subdata-
measured in
data-type type
IEC 60958
Value of data- Value of
frames
type bits data-
type bits
0 to 4
5 to 6
MPEG-2, layer-3 low sampling bits
10 0 bit 0 of Pa 1 152
frequency
11 0 DTS type I bit 0 of Pa 512 bits
12 0 DTS type II bit 0 of Pa 1 024 bits
13 0 DTS type III bit 0 of Pa 2 048 bits
14 0 ATRAC bit 0 of Pa 512 bits
15 0 ATRAC 2/3 bit 0 of Pa 1 024 bits
0 ATRAC-X bit 0 of Pa 2 048 bits
1 ATRAC-X low latency bit 0 of Pa 512 bits
2 ATRAC-X low latency bit 0 of Pa 256 bits
3 ATRAC-X low latency bit 0 of Pa 128 bits
See bytes
17 0 DTS type IV bit 0 of Pa
IEC 61937-5
c
0 WMA professional type I 2 048 bits
bit 0 of Pa
1 WMA professional type II bit 0 of Pa 2 048 bits
2 WMA professional type III bit 0 of Pa 1 024 bits
3 WMA professional type IV bit 0 of Pa 512 bits
bits
MPEG-2 AAC low sampling
0 bit 0 of Pa 2 048
frequency
MPEG-2 AAC low sampling bits
19 1 bit 0 of Pa 4 096
frequency
MPEG-2 AAC low sampling bits
2 – 3 reserved reserved
frequency
0 MPEG-4 AAC bit 0 of Pa 1 024 bits
1 MPEG-4 AAC bit 0 of Pa 2 048 bits
2 MPEG-4 AAC bit 0 of Pa 4 096 bits
3 MPEG-4 AAC bit 0 of Pa 512 bits
21 0 Enhanced AC-3 bit 0 of Pa 6 144 bytes
22 0 MAT R-MAT 15 360 bytes
See 8-bytes
0 MPEG-4 ALS bit 0 of Pa
IEC 61937-10
MPEG-4 AAC LC in See bits
1 bit 0 of Pa
LATM/LOAS IEC 61937-11
MPEG-4 HE AAC in See bits
2 bit 0 of Pa
LATM/LOAS IEC 61937-11
See bits
3 DRA bit 0 of Pa
IEC 61937-12
See bytes
0 AC-4 bit 0 of Pa
IEC 61937-14
See bytes
1 AC-4 HBR4 bit 0 of Pa
IEC 61937-14
8-bytes
See
2 AC-4 HBR16 bit 0 of Pa
IEC 61937-14
See bytes
3 AC-4 LD bit 0 of Pa
IEC 61937-14
See bytes
0 MPEG-H 3D Audio bit 0 of Pa
IEC 61937-13
See 8-bytes
1 MPEG-H 3D Audio HBR bit 0 of Pa
IEC 61937-13
– 12 – IEC 61937-2:2007+AMD1:2011
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Contents Units of Pd
Data-type Reference Repetition
value of Pc bit 0 to 6 point R period of
data-burst
Conventional Subdata-
measured in
data-type type
IEC 60958
Value of data- Value of
frames
type bits data-
type bits
0 to 4
5 to 6
See 8-bytes
2 MPEG-4 ALS in LATM/LOAS bit 0 of Pa
IEC 61937-10
Reserved (do not use until
defined)
103 – 107
Reserved (do not use until
defined)
(26) (0 – 3)
27 – 30 0 – 3 Refer to SMPTE ST 338  bits
Extended data-type (do not use
31 0 – 3
until defined)
a
Refer to IEC 61937-1:2007, 7.3.
b
The repetition period of pause data-bursts depends on the application. The repetition period of pause data-
bursts is defined for each audio data-burst.
c
Refer to IEC 61937-8:2006, 4.2.

4.3 Audio data-bursts
4.3.1 General
This subclause specifies the audio data-bursts. Specific properties such as reference points,
repetition period, the method of filling stream gaps, and decoding latency are specified for
each data-type.
The decoding latency (or delay), indicated for the data-types, shall be used by the transmitter
to schedule data-bursts as necessary to establish synchronization between picture and
decoded audio.
4.3.2 AC-3
The AC-3 bitstream consists of a sequence of AC-3-frames. The data-type of an AC-3 data-
burst is 1 and the subdata-type of an AC-3 data-burst is 0. An AC-3 frame represents 1 536
samples of each encoded audio channel (left, centre, etc.). The data-burst is headed with a
burst-preamble, followed by the burst-payload. The burst-payload of each data-burst of AC-3
data shall contain one complete AC-3-frame.
The length of the AC-3 data-burst will depend on the encoded bit rate (which determines the
AC-3-frame length). The specification for the AC-3 bitstream may be found in ITU-R
Recommendation BS.1196; the burst format is specified in IEC 61937-3.
4.3.3 MPEG-1 layer-1
An MPEG-1 layer-1 MPEG-frame represents 384 samples of each encoded channel and can
be transferred using data-type 4 and the subdata-type 0. The data-burst is headed with a
burst-preamble, followed by the burst-payload; see ISO/IEC 11172-3 and IEC 61937-4.
4.3.4 MPEG-1 layer-2 or layer-3 or MPEG-2 without extension
The burst-payload of MPEG-1 layer-2, or layer-3, or MPEG-2 without extension, represents
1 152 samples of each encoded channel and can be transferred using data-type 5 and sub-
data-type 0. The data-burst is headed with a burst-preamble, followed by the burst-payload;
see ISO/IEC 11172-3, ISO/IEC 13818-3 and IEC 61937-4.

+AMD2:2018 CSV  IEC 2018
4.3.5 MPEG-2 with extension
The burst-payload of MPEG-2 with extension represents 1 152 samples of each encoded
channel and can be transferred using data type 6 and subdata-type 0. The data-burst is
headed with a burst-preamble, followed by the burst-payload; see ISO/IEC 13818-3 and
IEC 61937-4.
4.3.6 MPEG-2 AAC
The payload of MPEG-2 AAC represents 1 024 samples of each encoded channel and can be
transferred using data-type 7 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see ISO/IEC 13818-7 and IEC 61937-6.
4.3.7 MPEG-2 layer-1 low sampling frequency
An MPEG-2 layer-1 frame with low sampling frequency represents 384 samples of each
encoded channel and can be transferred using data-type 8 and subdata-type 0. The data-
burst is headed with a burst-preamble, followed by the burst-payload; see ISO/IEC 13818-3
and IEC 61937-4.
4.3.8 MPEG-2 layer-2 low sampling frequency
The payload of MPEG-2 layer-2 frame with low sampling frequency represents 1 152 samples
of each encoded channel and can be transferred using data-type 9 and subdata-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see
ISO/IEC 13818-3 and IEC 61937-4.
4.3.9 MPEG-2 layer-3 low sampling frequency
The payload of MPEG-2 layer-3 frame with low sampling frequency represents 576 samples of
each encoded channel and can be transferred using data-type 10 and subdata-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see
ISO/IEC 13818-3 and IEC 61937-4.
4.3.10 DTS type I
The payload of DTS type I represents 512 samples of each encoded channel and can be
transferred using data-type 11 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.11 DTS type II
The payload of DTS type II represents 1 024 samples of each encoded channel and can be
transferred using data-type 12 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.12 DTS type III
The payload of DTS type III represents 2 048 samples of each encoded channel and can be
transferred using data-type 13 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.13 DTS type IV
The payload of DTS type IV represents samples of each encoded channel and can be
transferred using data-type 17 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.

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4.3.14 ATRAC
The payload of ATRAC represents 512 samples of each encoded channel and can be
transferred using data-type 14 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.
4.3.15 ATRAC 2/3
The payload of ATRAC 2/3 represents 1 024 samples of each encoded channel and can be
transferred using data-type 15 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.
4.3.16 ATRAC-X
The payload of ATRAC-X represents 2 048 samples of each encoded channel and can be
transferred using data-type 16 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.
4.3.17 MPEG-2 AAC low sampling frequency
The payload of MPEG-2 AAC low sampling frequency represents 2 048 samples of each
encoded channel and can be transferred using data-type 19 and subdata-type 0 or it
represents 4 096 samples of each encoded channel and can be transferred using data-type
19 and subdata-type 1. The data-burst is headed with a burst-preamble, followed by the burst-
payload; see ISO/IEC 13818-7 and IEC 61937-6.
4.3.18 MPEG-4 AAC
The payload of MPEG-4 AAC represents 1 024 samples of each encoded channel and can be
transferred using data-type 20 and subdata-type 0. The payload of MPEG-4 AAC represents
2 048 samples of each encoded channel and can be transferred using data-type 20 and sub-
data-type 1. The payload of MPEG-4 AAC represents 4 096 samples of each encoded channel
and can be transferred using data-type 20 and subdata-type 2. The payload of MPEG-4 AAC
represents 512 samples of each encoded channel and can be transferred using data-type 20
and subdata-type 3. The data-burst is headed with a burst-preamble, followed by the burst-
payload; see ISO/IEC 14496-3 and IEC 61937-6.
4.3.19 Windows Media Audio professional
The payload of WMA professional type I represents 2 048 samples of each encoded channel
and can be transferred using data-type 18 and subdata-type 0. The payload of WMA
professional type II represents 2 048 samples of each encoded channel and can be
transferred using data-type 18 and subdata-type 1. The payload of WMA professional type III
represents 1 024 samples of each encoded channel and can be transferred using data-type
18 and subdata-type 2. The payload of WMA professional type IV represents 512 samples of
each encoded channel and can be transferred using data-type 18 and subdata-type 3. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see IEC 61937-8.
4.3.20 Enhanced AC-3
The enhanced AC-3 bitstream consists of a sequence of enhanced AC-3-frames. The data-
type of an enhanced AC-3 data-burst is 21 and the subdata-type of an enhanced AC-3 data-
burst is 0. The contents of an enhanced AC-3 data-burst represent 1 536 samples of each
encoded audio channel. The data-burst is headed with a burst-preamble, followed by the
burst-payload; see IEC 61937-3.
4.3.21 MAT
The MAT bitstream consists of a sequence of frames. The data-type of an MAT data-burst is
22 and the subdata-type is 0. The data-burst is headed with a burst-preamble, followed by the
burst-payload. The burst-payload of each data-burst of MAT data shall contain 1 complete

+AMD2:2018 CSV  IEC 2018
MAT frame. The length of the MAT data-burst depends on the encoded bit rate (which
determines the MAT frame length); see IEC 61937-9.
4.3.22 MPEG-4 ALS
The MPEG-4 ALS bitstream consists of a sequence of frames. The data-type of an MPEG-4
ALS data-burst is 23 and the subdata-type is 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload. The burst-payload of each data-burst of MPEG-4
ALS data shall contain 1 complete MPEG-4 ALS frame. The length of the MPEG-4 ALS data-
burst depends on the encoded bit rate (which determines the MPEG-4 ALS frame length), see
IEC 61937-10.
4.3.23 MPEG-4 AAC LC in LATM/LOAS
The MPEG-4 AAC LC in LATM/LOAS bitstream consists of a sequence of frames. The data-
type of an MPEG-4 AAC LC in LATM/LOAS data-burst is 23 and the subdata-type is 1. The
data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload
of each data-burst of MPEG-4 AAC LC in LATM/LOAS data shall contain 1 complete MPEG-4
AAC LC in LATM/LOAS frame. The length of the MPEG-4 AAC LC in LATM/LOAS data-burst
depends on the encoded bit rate (which determines the MPEG-4 AAC LC in LATM/LOAS
frame length), see IEC 61937-11.
4.3.24 MPEG-4 HE AAC in LATM/LOAS
The MPEG-4 HE AAC in LATM/LOAS bitstream consists of a sequence of frames. The data-
type of an MPEG-4 HE AAC in LATM/LOAS data-burst is 23 and the subdata-type is 2. The
data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload
of each data-burst of MPEG-4 HE AAC in LATM/LOAS data shall contain 1 complete MPEG-4
HE AAC in LATM/LOAS frame. The length of the MPEG-4 HE AAC in LATM/LOAS data-burst
depends on the encoded bit rate (which determines the MPEG-4 HE AAC in LATM/LOAS
frame length), see IEC 61937-11.
4.3.25 DRA
The DRA bitstream consists of a sequence of frames. The data-type of a DRA data-burst is 23
and the subdata-type is 3. The data-burst is headed with a burst-preamble, followed by the
burst-payload. The burst-payload of each data-burst of DRA data shall contain 1 complete
DRA frame. The length of the DRA data-burst depends on the encoded bit rate (which
determines the DRA frame length), see IEC 61937-12.
4.3.26 ATRAC-X low latency
The payload of ATRAC-X represents 512 samples of each encoded channel and can be
transferred by assigning 16 to data-type bits 0 to 4 and 1 to data-type bits 5 to 6, or it
represents 256 samples of each encoded channel and can be transferred by assigning 16 to
data-type bits 0 to 4 and 2 to data-type bits 5 to 6, or 128 samples of each encoded channel
and can be transferred by assigning 16 to data-type bits 0 to 4 and 3 to data-type bits 5 to 6.
The data-burst is headed with a burst-preamble, followed by the burst-payload; see
IEC 61937-7.
4.3.27 MPEG-H 3D Audio
The MPEG-H 3D Audio bitstream consists of a sequence of frames. The value of data-type
bits 0 to 4 of an MPEG-H 3D Audio data-burst is 25 and the value of data-type bits 5 to 6 is 0.
The value of data-type bits 0 to 4 of an MPEG-H 3D Audio HBR data-burst is 25 and the value
of data-type bits 5 to 6 is 1. The data-burst is headed with a burst-preamble, followed by the
burst-payload. The burst-payload of each data-burst of MPEG-H 3D Audio shall contain one
complete MPEG-H 3D Audio frame. The length of the MPEG-H 3D Audio data-burst depends
on the encoded bit rate (which determines the MPEG-H 3D Audio frame length); see
IEC 61937-13.
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4.3.28 AC-4, AC-4 HBR4, AC-4 HBR16 and AC-4 LD
The AC-4 bitstream consists of a sequence of frames. The value of data-type bits 0 to 4 of an
AC-4 data-burst is 24 and the value of data-type bits 5 to 6 is 0. The value of data-type bits 0
to 4 of an AC-4 HBR4 data-burst is 24 and the value of data-type bits 5 to 6 is 1. The value of
data-type bits 0 to 4 of an AC-4 HBR16 data-burst is 24 and the value of data-type bits 5 to 6
is 2. The value of data-type of an AC-4 LD data-burst is 24 and the value of data-type bits 5 to
6 is 3. The data-burst is headed with a burst-preamble, followed by the burst-payload. The
burst-payload of each data-burst of AC-4 data shall contain one complete AC-4 frame. The
length of the AC-4 data-burst depends on the encoded bit rate (which determines the AC-4
frame length); see IEC 61937-14.
4.3.29 MPEG-4 ALS in LATM/LOAS
The MPEG-4 ALS in LATM/LOAS bitstream consists of a sequence of frames. The value of
data-type bits 0 to 4 of an MPEG-4 ALS in LATM/LOAS data-burst is 25 and the value of data-
type bits 5 to 6 is 2. The data-burst is headed with a burst-preamble, followed by the burst-
payload. The burst-payload of each data-burst of MPEG-4 ALS in LATM/LOAS data shall
contain one complete MPEG-4 ALS frame. The length of the MPEG-4 ALS in LATM/LOAS
data-burst depends on the encoded bit rate (which determines the MPEG-4 ALS frame
length); see IEC 61937-10.
+AMD2:2018 CSV  IEC 2018
Bibliography
SMPTE ST 338, Format for Non-PCM Audio and Data in AES3 – Data Types

___________
IEC 61937-2 ®
Edition 2.2 2018-03
CONSOLIDATED VERSION
FINAL VERSION
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
– 2 – IEC 61937-2:2007+AMD1:2011
+AMD2:2018 CSV  IEC 2018
CONTENTS
FOREWORD . 3
INTRODUCTION to Amendment 1 . 5
INTRODUCTION to Amendment 2 . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Burst-info . 8
4.1 General .
...

IEC 61937-2 ®
Edition 2.0 2007-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
Audionumérique – Interface pour les flux de bits audio à codage MIC non
linéaire conformément à la CEI 60958 –
Partie 2: Salve d'informations

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IEC 61937-2 ®
Edition 2.0 2007-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
Audionumérique – Interface pour les flux de bits audio à codage MIC non linéaire
conformément à la CEI 60958 –
Partie 2: Salve d'informations

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX L
ICS 33.160.30 ISBN 978-2-88912-693-4

– 2 – 61937-2  IEC:2007
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 7
4 Burst-info . 7
4.1 General . 7
4.2 Data-type and subdata-type . 7
4.3 Audio data-bursts . 9
4.3.1 General . 9
4.3.2 AC-3 . 9
4.3.3 MPEG-1 layer-1 . 9
4.3.4 MPEG-1 layer-2 or -3 or MPEG-2 without extension . 9
4.3.5 MPEG-2 with extension . 9
4.3.6 MPEG-2 AAC . 9
4.3.7 MPEG-2 layer-1 low sampling frequency . 9
4.3.8 MPEG-2 layer-2 low sampling frequency . 10
4.3.9 MPEG-2 layer-3 low sampling frequency . 10
4.3.10 DTS type I . 10
4.3.11 DTS type II . 10
4.3.12 DTS type III . 10
4.3.13 DTS type IV . 10
4.3.14 ATRAC . 10
4.3.15 ATRAC 2/3 . 10
4.3.16 ATRAC-X . 10
4.3.17 MPEG-2 AAC low sampling frequency . 10
4.3.18 MPEG-4 AAC . 11
4.3.19 Windows Media Audio professional. 11
4.3.20 Enhanced AC-3 . 11
4.3.21 MAT . 11

Table 1 – Fields of burst-info . 7
Table 2 – Data-types . 8

61937-2  IEC:2007 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 2: Burst-info
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 61937-2 has been prepared by technical area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
This second edition of IEC 61937-2 cancels and replaces the first edition published in 2000.
This edition contains the following significant technical changes with respect to the previous
edition.
a) New audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling frequency,
MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional and MAT are added.
b) Data-type field in Pc is expanded from bit 0-4 to 0-6.

– 4 – 61937-2  IEC:2007
This bilingual version corresponds to the monolingual English version, published in 2007-05.
The text of this standard is based on the following documents:
CDV Report on voting
100/1115/CDV 100/1221/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all the parts of the IEC 61937 series, 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 maintenance result 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.
61937-2  IEC:2007 – 5 –
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 2: Burst-info
1 Scope
This part of IEC 61937 specifies the digital audio interface to convey non-linear PCM encoded
audio bitstreams applying IEC 60958-1 and IEC 60958-3. This standard specifies burst-info
which defines content information about the data contained in the burst payload.
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 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 1: General
IEC 61937-3, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 3: Non-linear PCM bitstreams according to the AC-3 format
IEC 61937-4, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 4: Non-linear PCM bitstreams according to the MPEG audio format
IEC 61937-5, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater
Systems) format(s)
IEC 61937-6, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC and MPEG-4
AAC audio formats
IEC 61937-7, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and
ATRAC-X formats
IEC 61937-8, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 8: Non-linear PCM bitstreams according to the Windows Media Audio
(WMA) Professional format
IEC 61937-9, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 9: Non-linear PCM bitstreams according to the MAT format
—————————
To be published.
– 6 – 61937-2  IEC:2007
ISO/IEC 11172-3: Information technology – Coding of moving pictures and associated audio
for digital storage media at up to about 1,5 Mb/s – Part 3: Audio
ISO/IEC 13818-3, Information technology – Generic coding of moving pictures and associated
audio information – Part 3: Audio
ISO/IEC 13818-7, Information technology – Generic coding of moving pictures and associated
audio information – Advanced Audio Coding (AAC)
ISO/IEC 14496-3, Information technology – Coding of audio-visual objects – Part 3: Audio
ITU-R Recommendation BS.1196, Audio coding for digital terrestrial television broadcasting
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
audio data-burst data-burst with an encoded audio frame as burst-payload
audio data-word 16-bit data word
audio frame fixed number of audio samples. The number of samples in an audio
frame is dependent on the particular encoding system which is
used to encode the audio frame into the encoded audio frame
audio gap period in the sequence of baseband audio samples where valid
samples of audio are not available
bitstream non-linear PCM encoded audio source, represented in a sequence
of bits. In this interface the bitstream consists of a sequence of
data-bursts
data-burst packet of data, including the burst-preamble, to be transmitted
across the interface
burst-payload information content of the data-burst
burst-preamble header for the data-burst, containing synchronization and
information about the data contained in the burst-payload
data-type reference to the type of payload of the data-bursts
encoded audio frame minimum decodable unit of an encoded data sequence. Each
encoded audio frame is the encoded representation of a fixed
number of audio samples (for each original audio channel). The
number of samples which are encoded into an encoded audio
frame depends on the particular encoding system which is used to
encode the audio frame into the encoded audio frame
length-code length of the data-burst-payload in bits
repetition period period between the reference point of the current data-burst, and
the reference point of the immediately following data-burst of the
same data-type
sampling frequency sampling frequency of the encoded PCM audio samples (i.e. before
encoding and after decoding)
sampling period period related to the sampling frequency of the PCM audio
samples, represented in the encoded bitstream
stuffing occupying the unused data capacity of the interface
stuffing sub-frame occupying the unused data capacity in 16-bit audio data words
stream gap period within the encoded audio bitstream without any audio frame;
a discontinuity in the bitstream. Typically, a stream gap will occur
between encoded audio frames
61937-2  IEC:2007 – 7 –
3.2 Abbreviations
ATRAC Adaptive TRansform Acoustic Coding
ATRAC2 Adaptive TRansform Acoustic Coding 2
ATRAC3 Adaptive TRansform Acoustic Coding 3
ATRAC2/3 ATRAC2 and/or ATRAC3
ATRAC-X Adaptive TRansform Acoustic Coding-X
ATSC Advanced Television Systems Committee
IEC International Electrotechnical Commission
ISO/IEC MPEG Moving Pictures Expert Group, a joint committee of ISO and IEC
ITU-R International Telecommunication Union, Radiocommunication
Bureau
MPEG Motion Pictures Expert Group, a joint committee of ISO and IEC
SMPTE Society of Motion Picture and Television Engineers
4 Burst-info
4.1 General
The 16-bit burst-info contains information about the data which will be found in the data-burst.
Fields of burst-info is specified in Table 1.
Table 1 – Fields of burst-info
Bits of Value Contents
Pc
0-4 Data-type
0-31 See Table 2
5-6 Subdata-type
0-3 See Table 2
7 Error-flag
0 Error-flag indicating a valid burst-payload
1 Error-flag indicating that the burst-payload may contain errors
8-12 Data-type-dependent info
13-15 0-7 Bit-stream-number
NOTE Refer to IEC 61937-1, 6.1.7 and 6.1.7.1.
4.2 Data-type and subdata-type
Data type defined in PC bits 0-6 in IEC 61937-1 consists of conventional data-type (0-4) and
subdata-type (5-6) for historical reasons. All data-types are defined in Table 2.
Any combination of data-type and subdata-type which is not defined in Table 2 shall not be
transmitted.
– 8 – 61937-2  IEC:2007
Table 2 – Data-types
Data- Subdata-
Contents Reference Repetition
type type
point R period of data-
burst measured
Value of Value of
in IEC 60958
PC bit PC bit
frames
0-4 5-6
0 0 Null data See Note 1
1 0 AC-3 data R-AC-3 1 536
2 0 – 3 Refer to SMPTE 338M
3 0 Pause bit 0 of Pa See Note 2
4 0 MPEG-1 layer 1 data bit 0 of Pa 384
5 0 MPEG-1 layer 2 or 3 data or MPEG-2 without bit 0 of Pa 1 152
extension
6 0 MPEG-2 data with extension bit 0 of Pa 1 152
7 0 MPEG-2 AAC bit 0 of Pa 1 024
8 0 MPEG-2, layer-1 low sampling frequency bit 0 of Pa 768
9 0 MPEG-2, layer-2 low sampling frequency bit 0 of Pa 2 304
10 0 MPEG-2, layer-3 low sampling frequency bit 0 of Pa 1 152
11 0 DTS type I bit 0 of Pa 512
12 0 DTS type II bit 0 of Pa 1 024
13 0 DTS type III bit 0 of Pa 2 048
14 0 ATRAC bit 0 of Pa 512
15 0 ATRAC 2/3 bit 0 of Pa 1 024
16 0 ATRAC-X bit 0 of Pa 2 048
17 0 DTS type IV bit 0 of Pa See IEC 61937-5
18 0 WMA professional type I bit 0 of Pa *3 2 048
1 WMA professional type II bit 0 of Pa 2 048
2 WMA professional type III bit 0 of Pa 1 024
3 WMA professional type IV bit 0 of Pa 512
19 0 MPEG-2 AAC low sampling frequency bit 0 of Pa 2 048
1 MPEG-2 AAC low sampling frequency bit 0 of Pa 4 096
2 – 3 MPEG-2 AAC low sampling frequency reserved reserved
20 0 MPEG-4 AAC bit 0 of Pa 1 024
1 MPEG-4 AAC bit 0 of Pa 2 048
2 MPEG-4 AAC bit 0 of Pa 4 096
3 MPEG-4 AAC bit 0 of Pa 512
21 0 Enhanced AC-3 bit 0 of Pa 6 144
1 – 3 Reserved reserved reserved
22 0 MAT R-MAT 15 360
1 – 3 Reserved reserved reserved
23 – 26 0 – 3 Reserved
27 – 30 0 – 3 Refer to SMPTE 338M
31 0 – 3 Extended data-type (not use until defined)
NOTE 1 Refer to IEC 61937-1, 7.3.
NOTE 2 The repetition period of pause data-bursts depends on the application. The repetition period of
pause data-bursts is defined for each audio data-burst.
NOTE 3 Refer to IEC 61937-8, 4.2.

61937-2  IEC:2007 – 9 –
4.3 Audio data-bursts
4.3.1 General
This subclause specifies the audio data-bursts. Specific properties such as reference points,
repetition period, the method of filling stream gaps, and decoding latency are specified for
each data-type.
The decoding latency (or delay), indicated for the data-types, shall be used by the transmitter
to schedule data-bursts as necessary to establish synchronization between picture and
decoded audio.
4.3.2 AC-3
The AC-3 bitstream consists of a sequence of AC-3-frames. The data-type of an AC-3 data-
burst is 1 and the subdata-type of an AC-3 data-burst is 0. An AC-3 frame represents 1 536
samples of each encoded audio channel (left, centre, etc.). The data-burst is headed with a
burst-preamble, followed by the burst-payload. The burst-payload of each data-burst of AC-3
data shall contain one complete AC-3-frame.
The length of the AC-3 data-burst will depend on the encoded bit rate (which determines the
AC-3-frame length). The specification for the AC-3 bitstream may be found in ITU-R
Recommendation BS.1196; the burst format is specified in IEC 61937-3.
4.3.3 MPEG-1 layer-1
An MPEG-1 layer-1 MPEG-frame represents 384 samples of each encoded channel and can
be transferred using data-type 4 and the subdata-type 0. The data-burst is headed with a
burst-preamble, followed by the burst-payload; see ISO/IEC 11172-3 and IEC 61937-4.
4.3.4 MPEG-1 layer-2 or layer-3 or MPEG-2 without extension
The burst-payload of MPEG-1 layer-2, or layer-3, or MPEG-2 without extension, represents
1 152 samples of each encoded channel and can be transferred using data-type 5 and sub-
data-type 0. The data-burst is headed with a burst-preamble, followed by the burst-payload;
see ISO/IEC 11172-3, ISO/IEC 13818-3 and IEC 61937-4.
4.3.5 MPEG-2 with extension
The burst-payload of MPEG-2 with extension represents 1 152 samples of each encoded
channel and can be transferred using data type 6 and subdata-type 0. The data-burst is
headed with a burst-preamble, followed by the burst-payload; see ISO/IEC 13818-3 and
IEC 61937-4.
4.3.6 MPEG-2 AAC
The payload of MPEG-2 AAC represents 1 024 samples of each encoded channel and can be
transferred using data-type 7 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see ISO/IEC 13818-7 and IEC 61937-6.
4.3.7 MPEG-2 layer-1 low sampling frequency
An MPEG-2 layer-1 frame with low sampling frequency represents 384 samples of each
encoded channel and can be transferred using data-type 8 and subdata-type 0. The data-
burst is headed with a burst-preamble, followed by the burst-payload; see ISO/IEC 13818-3
and IEC 61937-4.
– 10 – 61937-2  IEC:2007
4.3.8 MPEG-2 layer-2 low sampling frequency
The payload of MPEG-2 layer-2 frame with low sampling frequency represents 1 152 samples
of each encoded channel and can be transferred using data-type 9 and subdata-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see
ISO/IEC 13818-3 and IEC 61937-4.
4.3.9 MPEG-2 layer-3 low sampling frequency
The payload of MPEG-2 layer-3 frame with low sampling frequency represents 576 samples of
each encoded channel and can be transferred using data-type 10 and subdata-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see
ISO/IEC 13818-3 and IEC 61937-4.
4.3.10 DTS type I
The payload of DTS type I represents 512 samples of each encoded channel and can be
transferred using data-type 11 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.11 DTS type II
The payload of DTS type II represents 1 024 samples of each encoded channel and can be
transferred using data-type 12 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.12 DTS type III
The payload of DTS type III represents 2 048 samples of each encoded channel and can be
transferred using data-type 13 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.13 DTS type IV
The payload of DTS type IV represents samples of each encoded channel and can be
transferred using data-type 17 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.14 ATRAC
The payload of ATRAC represents 512 samples of each encoded channel and can be
transferred using data-type 14 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.
4.3.15 ATRAC 2/3
The payload of ATRAC 2/3 represents 1 024 samples of each encoded channel and can be
transferred using data-type 15 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.
4.3.16 ATRAC-X
The payload of ATRAC-X represents 2 048 samples of each encoded channel and can be
transferred using data-type 16 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.
4.3.17 MPEG-2 AAC low sampling frequency
The payload of MPEG-2 AAC low sampling frequency represents 2 048 samples of each
encoded channel and can be transferred using data-type 19 and subdata-type 0 or it

61937-2  IEC:2007 – 11 –
represents 4 096 samples of each encoded channel and can be transferred using data-type
19 and subdata-type 1. The data-burst is headed with a burst-preamble, followed by the burst-
payload; see ISO/IEC 13818-7 and IEC 61937-6.
4.3.18 MPEG-4 AAC
The payload of MPEG-4 AAC represents 1 024 samples of each encoded channel and can be
transferred using data-type 20 and subdata-type 0. The payload of MPEG-4 AAC represents
2 048 samples of each encoded channel and can be transferred using data-type 20 and sub-
data-type 1. The payload of MPEG-4 AAC represents 4 096 samples of each encoded channel
and can be transferred using data-type 20 and subdata-type 2. The payload of MPEG-4 AAC
represents 512 samples of each encoded channel and can be transferred using data-type 20
and subdata-type 3. The data-burst is headed with a burst-preamble, followed by the burst-
payload; see ISO/IEC 14496-3 and IEC 61937-6.
4.3.19 Windows Media Audio professional
The payload of WMA professional type I represents 2 048 samples of each encoded channel
and can be transferred using data-type 18 and subdata-type 0. The payload of WMA
professional type II represents 2 048 samples of each encoded channel and can be
transferred using data-type 18 and subdata-type 1. The payload of WMA professional type III
represents 1 024 samples of each encoded channel and can be transferred using data-type
18 and subdata-type 2. The payload of WMA professional type IV represents 512 samples of
each encoded channel and can be transferred using data-type 18 and subdata-type 3. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see IEC 61937-8.
4.3.20 Enhanced AC-3
The enhanced AC-3 bitstream consists of a sequence of enhanced AC-3-frames. The data-
type of an enhanced AC-3 data-burst is 21 and the subdata-type of an enhanced AC-3 data-
burst is 0. The contents of an enhanced AC-3 data-burst represent 1 536 samples of each
encoded audio channel. The data-burst is headed with a burst-preamble, followed by the
burst-payload; see IEC 61937-3.
4.3.21 MAT
The MAT bitstream consists of a sequence of frame
...

IEC 61937-2 ®
Edition 2.1 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
Audionumérique – Interface pour les flux de bits audio à codage MIC non
linéaire conformément à la CEI 60958 –
Partie 2: Salve d'informations

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IEC 61937-2 ®
Edition 2.1 2011-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
Audionumérique – Interface pour les flux de bits audio à codage MIC non
linéaire conformément à la CEI 60958 –
Partie 2: Salve d'informations

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CD
ICS 33.160.30 ISBN 978-2-88912-797-9

– 2 – 61937-2  IEC:2007+A1:2011

CONTENTS
FOREWORD . 3

INTRODUCTION (to Amendment 1) . 5

1 Scope . 6

2 Normative references . 6

3 Terms, definitions and abbreviations . 7

3.1 Terms and definitions . 7

3.2 Abbreviations . 8
4 Burst-info . 8
4.1 General . 8
4.2 Data-type and subdata-type . 9
4.3 Audio data-bursts . 11
4.3.1 General . 12
4.3.2 AC-3 . 12
4.3.3 MPEG-1 layer-1 . 12
4.3.4 MPEG-1 layer-2 or -3 or MPEG-2 without extension . 12
4.3.5 MPEG-2 with extension . 12
4.3.6 MPEG-2 AAC . 13
4.3.7 MPEG-2 layer-1 low sampling frequency . 13
4.3.8 MPEG-2 layer-2 low sampling frequency . 13
4.3.9 MPEG-2 layer-3 low sampling frequency . 13
4.3.10 DTS type I . 13
4.3.11 DTS type II . 13
4.3.12 DTS type III . 13
4.3.13 DTS type IV . 13
4.3.14 ATRAC . 13
4.3.15 ATRAC 2/3 . 14
4.3.16 ATRAC-X . 14
4.3.17 MPEG-2 AAC low sampling frequency . 14
4.3.18 MPEG-4 AAC . 14
4.3.19 Windows Media Audio professional. 14
4.3.20 Enhanced AC-3 . 14

4.3.21 MAT . 14
4.3.22 MPEG-4 ALS . 15
4.3.23 MPEG-4 AAC LC in LATM/LOAS . 15
4.3.24 MPEG-4 HE AAC in LATM/LOAS . 15
4.3.25 DRA . 15

Table 1 – Fields of burst-info . 8
Table 2 – Data-types . 10

61937-2  IEC:2007+A1:2011 – 3 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED

AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 2: Burst-info
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
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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.

This consolidated version of IEC 61937-2 consists of the second edition (2007)
[documents 100/1115/CDV and 100/1221/RVC] and its amendment 1 (2011) [documents
100/1811/CDV and 100/1884/RVC]. It bears the edition number 2.1.
The technical content is therefore identical to the base edition and its amendment and
has been prepared for user convenience. A vertical line in the margin shows where the
base publication has been modified by amendment 1. Additions and deletions are
displayed in red, with deletions being struck through.

– 4 – 61937-2  IEC:2007+A1:2011

International Standard IEC 61937-2 has been prepared by technical area 4: Digital system
interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia

systems and equipment.
a) New audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling frequency,

MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional and MAT are added.

b) Data-type field in Pc is expanded from bit 0-4 to 0-6.

The bilingual version (2011-10) corresponds to the monolingual English version, published in

2007-05.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all the parts of the IEC 61937 series, 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 the base publication and its amendments 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.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.

61937-2  IEC:2007+A1:2011 – 5 –

INTRODUCTION
(to Amendment 1)
The revision of IEC 61937-2 (2007) has become necessary to define additional data types, in

order to be consistent with the data-type field description in IEC 61937-1 and to clarify the

rule and definition of this data-type. Amendment 1 contains the following significant technical

changes with respect to the base publication (IEC 61937-2, second edition).

– New audio data-types of MPEG-4 ALS, MPEG-4 AAC LC in LATM/LOAS, MPEG-4 HE

AAC in LATM/LOAS and DRA are added.

– The description of data-type and subdata-type fields in Pc is clarified.

– A rule has been defined for new data-types.

– 6 – 61937-2  IEC:2007+A1:2011

DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED

AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 2: Burst-info
1 Scope
This part of IEC 61937 specifies the digital audio interface to convey non-linear PCM encoded
audio bitstreams applying IEC 60958-1 and IEC 60958-3. This standard specifies burst-info
which defines content information about the data contained in the burst payload.
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 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 1: General
IEC 61937-3, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 3: Non-linear PCM bitstreams according to the AC-3 format
IEC 61937-4, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 4: Non-linear PCM bitstreams according to the MPEG audio format
IEC 61937-5, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater
Systems) format(s)
IEC 61937-6, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying

IEC 60958 – Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC and MPEG-4
AAC audio formats
IEC 61937-7, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and
ATRAC-X formats
IEC 61937-8, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 8: Non-linear PCM bitstreams according to the Windows Media Audio
(WMA) Professional format
IEC 61937-9, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 9: Non-linear PCM bitstreams according to the MAT format
—————————
To be published.
61937-2  IEC:2007+A1:2011 – 7 –

IEC 61937-10, Digital audio – Interface for non-linear PCM encoded audio bitstreams

applying IEC 60958 – Part 10: Non-linear PCM bitstreams according to the MPEG-4 audio

lossless coding (ALS) format
IEC 61937-11, 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 61937-12, Digital audio – Interface for non-linear PCM encoded audio bitstreams

applying IEC 60958 – Part 12: Non-linear PCM bitstreams according to the DRA formats

ISO/IEC 11172-3: Information technology – Coding of moving pictures and associated audio

for digital storage media at up to about 1,5 Mb/s – Part 3: Audio
ISO/IEC 13818-3, Information technology – Generic coding of moving pictures and associated
audio information – Part 3: Audio
ISO/IEC 13818-7, Information technology – Generic coding of moving pictures and associated
audio information – Advanced Audio Coding (AAC)
ISO/IEC 14496-3, Information technology – Coding of audio-visual objects – Part 3: Audio
ITU-R Recommendation BS.1196, Audio coding for digital terrestrial television broadcasting
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
audio data-burst data-burst with an encoded audio frame as burst-payload
audio data-word 16-bit data word
audio frame fixed number of audio samples. The number of samples in an audio
frame is dependent on the particular encoding system which is
used to encode the audio frame into the encoded audio frame
audio gap period in the sequence of baseband audio samples where valid
samples of audio are not available
bitstream non-linear PCM encoded audio source, represented in a sequence
of bits. In this interface the bitstream consists of a sequence of
data-bursts
data-burst packet of data, including the burst-preamble, to be transmitted
across the interface
burst-payload information content of the data-burst
burst-preamble header for the data-burst, containing synchronization and
information about the data contained in the burst-payload
data-type reference to the type of payload of the data-bursts
encoded audio frame minimum decodable unit of an encoded data sequence. Each
encoded audio frame is the encoded representation of a fixed
number of audio samples (for each original audio channel). The
number of samples which are encoded into an encoded audio
frame depends on the particular encoding system which is used to
encode the audio frame into the encoded audio frame
length-code length of the data-burst-payload in bits
repetition period period between the reference point of the current data-burst, and
the reference point of the immediately following data-burst of the
same data-type
– 8 – 61937-2  IEC:2007+A1:2011

sampling frequency sampling frequency of the encoded PCM audio samples (i.e. before

encoding and after decoding)
sampling period period related to the sampling frequency of the PCM audio

samples, represented in the encoded bitstream

stuffing occupying the unused data capacity of the interface

stuffing sub-frame occupying the unused data capacity in 16-bit audio data words

stream gap period within the encoded audio bitstream without any audio frame;

a discontinuity in the bitstream. Typically, a stream gap will occur

between encoded audio frames
3.2 Abbreviations
ATRAC Adaptive TRansform Acoustic Coding
ATRAC2 Adaptive TRansform Acoustic Coding 2
ATRAC3 Adaptive TRansform Acoustic Coding 3
ATRAC2/3 ATRAC2 and/or ATRAC3
ATRAC-X Adaptive TRansform Acoustic Coding-X
ATSC Advanced Television Systems Committee
IEC International Electrotechnical Commission
ISO/IEC MPEG Moving Pictures Expert Group, a joint committee of ISO and IEC
ITU-R International Telecommunication Union, Radiocommunication
Bureau
MPEG Motion Pictures Expert Group, a joint committee of ISO and IEC
SMPTE Society of Motion Picture and Television Engineers
4 Burst-info
4.1 General
The 16-bit burst-info contains information about the data which will be found in the data-burst.
Fields of burst-info is specified in Table 1.
Table 1 – Fields of burst-info
Bits of
Value Contents
Pc
0-4 Data-type
0-31 See Table 2
5-6 Subdata-type
0-3 See Table 2
7 Error-flag
0 Error-flag indicating a valid burst-payload
1 Error-flag indicating that the burst-payload may contain errors
8-12 Data-type-dependent info
13-15 0-7 Bit-stream-number
NOTE Refer to IEC 61937-1, 6.1.7 and 6.1.7.1.

61937-2  IEC:2007+A1:2011 – 9 –

Bits of
Value Contents
Pc
0-6 Data-type (defined in IEC 61937-1)

0-4 Conventional data-type
0-31 See Table 2
5-6 Subdata-type
0-3 See Table 2
7 Error-flag
0 Error-flag indicating a valid burst-payload
1 Error-flag indicating that the burst-payload may contain errors
8-12 Data-type-dependent info
13-15 0-7 Bit-stream-number
NOTE Refer to IEC 61937-1, 6.1.7 and 6.1.7.1.

4.2 Data-type and subdata-type
Data type defined in PC bits 0-6 in IEC 61937-1 consists of conventional data-type (0-4) and
subdata-type (5-6) for historical reasons. All data-types are defined in Table 2.
Any combination of data-type and subdata-type which is not defined in Table 2 shall not be
transmitted.
Data-type defined in PC bits 0-6 in IEC 61937-1 consists of conventional data-type (0-4) and
subdata-type (5-6) for historical reasons. All conventional data-types and subdata-types are
defined in Table 2.
Further definition of data-type in the reserved area of Table 2 shall be allocated in PC bits 0-6,
in ascending order and without skipping gap.

– 10 – 61937-2  IEC:2007+A1:2011

Table 2 – Data-types
Data- Subdata-
Contents Reference Repetition
type type
point R period of data-
burst measured
Value of Value of
in IEC 60958
PC bit PC bit
frames
0-4 5-6
0 0 Null data See Note 1
1 0 AC-3 data R-AC-3 1 536
2 0 – 3 Refer to SMPTE 338M
3 0 Pause bit 0 of Pa See Note 2
4 0 MPEG-1 layer 1 data bit 0 of Pa 384
5 0 MPEG-1 layer 2 or 3 data or MPEG-2 without bit 0 of Pa 1 152
extension
6 0 MPEG-2 data with extension bit 0 of Pa 1 152
7 0 MPEG-2 AAC bit 0 of Pa 1 024
8 0 MPEG-2, layer-1 low sampling frequency bit 0 of Pa 768
9 0 MPEG-2, layer-2 low sampling frequency bit 0 of Pa 2 304
10 0 MPEG-2, layer-3 low sampling frequency bit 0 of Pa 1 152
11 0 DTS type I bit 0 of Pa 512
12 0 DTS type II bit 0 of Pa 1 024
13 0 DTS type III bit 0 of Pa 2 048
14 0 ATRAC bit 0 of Pa 512
15 0 ATRAC 2/3 bit 0 of Pa 1 024
16 0 ATRAC-X bit 0 of Pa 2 048
17 0 DTS type IV bit 0 of Pa See IEC 61937-5
18 0 WMA professional type I bit 0 of Pa *3 2 048
1 WMA professional type II bit 0 of Pa 2 048
2 WMA professional type III bit 0 of Pa 1 024
3 WMA professional type IV bit 0 of Pa 512
19 0 MPEG-2 AAC low sampling frequency bit 0 of Pa 2 048
1 MPEG-2 AAC low sampling frequency bit 0 of Pa 4 096
2 – 3 MPEG-2 AAC low sampling frequency reserved reserved
20 0 MPEG-4 AAC bit 0 of Pa 1 024

1 MPEG-4 AAC bit 0 of Pa 2 048
2 MPEG-4 AAC bit 0 of Pa 4 096
3 MPEG-4 AAC bit 0 of Pa 512
21 0 Enhanced AC-3 bit 0 of Pa 6 144
1 – 3 Reserved reserved reserved
22 0 MAT R-MAT 15 360
1 – 3 Reserved reserved reserved
23 – 26 0 – 3 Reserved
27 – 30 0 – 3 Refer to SMPTE 338M
31 0 – 3 Extended data-type (not use until defined)
NOTE 1 Refer to IEC 61937-1, 7.3.
NOTE 2 The repetition period of pause data-bursts depends on the application. The repetition period of
pause data-bursts is defined for each audio data-burst.
NOTE 3 Refer to IEC 61937-8, 4.2.

61937-2  IEC:2007+A1:2011 – 11 –

Data-type
Value of Pc bit 0-6
Conventional Subdata- Repetition period

data-type type Reference of data-burst
Contents
point R measured in
IEC 60958 frames
Value of Pc Value of
bit Pc bit
0-4 5-6
0 0 Null data See Note 1
1 0 AC-3 data R-AC-3 1 536
2 0 – 3 Refer to SMPTE 338M
3 0 Pause bit 0 of Pa See Note 2
4 0 MPEG-1 layer 1 data bit 0 of Pa 384
MPEG-1 layer 2 or 3 data or MPEG-2
5 0 bit 0 of Pa 1 152
without extension
6 0 MPEG-2 data with extension bit 0 of Pa 1 152
7 0 MPEG-2 AAC bit 0 of Pa 1 024
8 0 MPEG-2, layer-1 low sampling frequency bit 0 of Pa 768
9 0 MPEG-2, layer-2 low sampling frequency bit 0 of Pa 2 304
10 0 MPEG-2, layer-3 low sampling frequency bit 0 of Pa 1 152
11 0 DTS type I bit 0 of Pa 512
12 0 DTS type II bit 0 of Pa 1 024
13 0 DTS type III bit 0 of Pa 2 048
14 0 ATRAC bit 0 of Pa 512
15 0 ATRAC 2/3 bit 0 of Pa 1 024
16 0 ATRAC-X bit 0 of Pa 2 048
17 0 DTS type IV bit 0 of Pa See IEC 61937-5
0 WMA professional type I bit 0 of Pa *3 2 048
1 WMA professional type II bit 0 of Pa 2 048
2 WMA professional type III bit 0 of Pa 1 024
3 WMA professional type IV bit 0 of Pa 512
0 MPEG-2 AAC low sampling frequency bit 0 of Pa 2 048
19 1 MPEG-2 AAC low sampling frequency bit 0 of Pa 4 096
2 – 3 MPEG-2 AAC low sampling frequency reserved reserved
0 MPEG-4 AAC bit 0 of Pa 1 024

1 MPEG-4 AAC bit 0 of Pa 2 048
2 MPEG-4 AAC bit 0 of Pa 4 096
3 MPEG-4 AAC bit 0 of Pa 512
21 0 Enhanced AC-3 bit 0 of Pa 6 144
22 0 MAT R-MAT 15 360
0 MPEG-4 ALS bit 0 of Pa See IEC 61937-10
1 MPEG-4 AAC LC in LATM/LOAS bit 0 of Pa See IEC 61937-11
2 MPEG-4 HE AAC in LATM/LOAS bit 0 of Pa See IEC 61937-11
3 DRA bit 0 of Pa See IEC 61937-12
96 – 107
Reserved (do not use until defined)
(24 – 26) (0 – 3)
27 – 30 0 – 3 Refer to SMPTE 338M

– 12 – 61937-2  IEC:2007+A1:2011

Data-type
Value of Pc bit 0-6
Repetition period
Conventional Subdata-
data-type type Reference of data-burst

Contents
point R measured in
Value of Pc Value of IEC 60958 frames
bit Pc bit
0-4 5-6
Extended data-type (do not use until
31 0 – 3
defined)
NOTE 1 Refer to IEC 61937-1, 7.3.

NOTE 2 The repetition period of pause data-bursts depends on the application. The repetition period of

pause data-bursts is defined for each audio data-burst.
NOTE 3 Refer to IEC 61937-8, 4.2.

4.3 Audio data-bursts
4.3.1 General
This subclause specifies the audio data-bursts. Specific properties such as reference points,
repetition period, the method of filling stream gaps, and decoding latency are specified for
each data-type.
The decoding latency (or delay), indicated for the data-types, shall be used by the transmitter
to schedule data-bursts as necessary to establish synchronization between picture and
decoded audio.
4.3.2 AC-3
The AC-3 bitstream consists of a sequence of AC-3-frames. The data-type of an AC-3 data-
burst is 1 and the subdata-type of an AC-3 data-burst is 0. An AC-3 frame represents 1 536
samples of each encoded audio channel (left, centre, etc.). The data-burst is headed with a
burst-preamble, followed by the burst-payload. The burst-payload of each data-burst of AC-3
data shall contain one complete AC-3-frame.
The length of the AC-3 data-burst will depend on the encoded bit rate (which determines the
AC-3-frame length). The specification for the AC-3 bitstream may be found in ITU-R
Recommendation BS.1196; the burst format is specified in IEC 61937-3.
4.3.3 MPEG-1 layer-1
An MPEG-1 layer-1 MPEG-frame represents 384 samples of each encoded channel and can
be transferred using data-type 4 and the subdata-type 0. The data-burst is headed with a
burst-preamble, followed by the burst-payload; see ISO/IEC 11172-3 and IEC 61937-4.
4.3.4 MPEG-1 layer-2 or layer-3 or MPEG-2 without extension
The burst-payload of MPEG-1 layer-2, or layer-3, or MPEG-2 without extension, represents
1 152 samples of each encoded channel and can be transferred using data-type 5 and sub-
data-type 0. The data-burst is headed with a burst-preamble, followed by the burst-payload;
see ISO/IEC 11172-3, ISO/IEC 13818-3 and IEC 61937-4.
4.3.5 MPEG-2 with extension
The burst-payload of MPEG-2 with extension represents 1 152 samples of each encoded
channel and can be transferred using data type 6 and subdata-type 0. The data-burst is
headed with a burst-preamble, followed by the burst-payload; see ISO/IEC 13818-3 and
IEC 61937-4.
61937-2  IEC:2007+A1:2011 – 13 –

4.3.6 MPEG-2 AAC
The payload of MPEG-2 AAC represents 1 024 samples of each encoded channel and can be

transferred using data-type 7 and subdata-type 0. The data-burst is headed with a burst-

preamble, followed by the burst-payload; see ISO/IEC 13818-7 and IEC 61937-6.

4.3.7 MPEG-2 layer-1 low sampling frequency

An MPEG-2 layer-1 frame with low sampling frequency represents 384 samples of each

encoded channel and can be transferred using data-type 8 and subdata-type 0. The data-

burst is headed with a burst-preamble, followed by the burst-payload; see ISO/IEC 13818-3

and IEC 61937-4.
4.3.8 MPEG-2 layer-2 low sampling frequency
The payload of MPEG-2 layer-2 frame with low sampling frequency represents 1 152 samples
of each encoded channel and can be transferred using data-type 9 and subdata-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see
ISO/IEC 13818-3 and IEC 61937-4.
4.3.9 MPEG-2 layer-3 low sampling frequency
The payload of MPEG-2 layer-3 frame with low sampling frequency represents 576 samples of
each encoded channel and can be transferred using data-type 10 and subdata-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see
ISO/IEC 13818-3 and IEC 61937-4.
4.3.10 DTS type I
The payload of DTS type I represents 512 samples of each encoded channel and can be
transferred using data-type 11 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.11 DTS type II
The payload of DTS type II represents 1 024 samples of each encoded channel and can be
transferred using data-type 12 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.12 DTS type III
The payload of DTS type III represents 2 048 samples of each encoded channel and can be
transferred using data-type 13 and subdata-type 0. The data-burst is headed with a burst-

preamble, followed by the burst-payload; see IEC 61937-5.
4.3.13 DTS type IV
The payload of DTS type IV represents samples of each encoded channel and can be
transferred using data-type 17 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
4.3.14 ATRAC
The payload of ATRAC represents 512 samples of each encoded channel and can be
transferred using data-type 14 and subdata-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-7.

– 14 – 61937-2  IEC:2007+A1:2011

4.3.15 ATRAC 2/3
The payload of ATRAC 2/3 represents 1 024 samples of each encoded channel and can be

transferred using data-type 15 and subdata-type 0. The data-burst is headed with a burst-

preamble, followed by the burst-payload; see IEC 61937-7.

4.3.16 ATRAC-X
The payload of ATRAC-X represents 2 048 samples of each encoded channel and can be

transferred using data-type 16 and subdata-type 0. The data-burst is headed with a burst-

preamble, followed by the burst-payload; see IEC 61937-7.

4.3.17 MPEG-2 AAC low sampling frequency
The payload of MPEG-2 AAC low sampling frequency represents 2 048 samples of each
encoded channel and can be transferred using data-type 19 and subdata-type 0 or it
represents 4 096 samples of each encoded channel and can be transferred using data-type
19 and subdata-type 1. The data-burst is headed with a burst-preamble, followed by the burst-
payload; see ISO/IEC 13818-7 and IEC 61937-6.
4.3.18 MPEG-4 AAC
The payload of MPEG-4 AAC represents 1 024 samples of each encoded channel and can be
transferred using data-type 20 and subdata-type 0. The payload of MPEG-4 AAC represents
2 048 samples of each encoded channel and can be transferred using data-type 20 and sub-
data-type 1. The payload of MPEG-4 AAC represents 4 096 samples of each encoded channel
and can be transferred using data-type 20 and subdata-type 2. The payload of MPEG-4 AAC
represents 512 samples of each encoded channel and can be transferred using data-type 20
and subdata-type 3. The data-burst is headed with a burst-preamble, followed by the burst-
payload; see ISO/IEC 14496-3 and IEC 61937-6.
4.3.19 Windows Media Audio professional
The payload of WMA professional type I represents 2 048 samples of each encoded channel
and can be transferred using data-type 18 and subdata-type 0. The payload of WMA
professional type II represents 2 048 samples of each encoded channel and can be
transferred using data-type 18 and subdata-type 1. The payload of WMA professional type III
represents 1 024 samples of each encoded channel and can be transferred using data-type
18 and subdata-type 2. The payload of WMA professional type IV represents 512 samples of
each encoded channel and can be transferred using data-type 18 and subdata-type 3. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see IEC 61937-8.
4.3.20 Enhanced AC-3
The enhanced AC-3 bitstream consists of a sequence of enhanced AC-3-frames. The data-
type of an enhanced AC-3 data-burst is 21 and the subdata-type of an enhanced AC-3 data-
burst is 0. The contents of an enhanced AC-3 data-burst represent 1 536 samples of each
encoded audio channel. The data-burst is headed with a burst-preamble, followed by the
burst-payload; see IEC 61937-3.
4.3.21 MAT
The MAT bitstream consists of a sequence of frames. The data-type of an MAT data-burst is
22 and the subdata-type is 0. The data-burst is headed with a burst-preamble, followed by the
burst-payload. The burst-payload of each data-burst of MAT data shall contain 1 complete
MAT frame. The length of the MAT data-burst depends on the encoded bit rate (which
determines the MAT frame length); see IEC 61937-9.

61937-2  IEC:2007+A1:2011 – 15 –

4.3.22 MPEG-4 ALS
The MPEG-4 ALS bitstream consists of a sequence of frames. The data-type of an MPEG-4

ALS data-burst is 23 and the subdata-type is 0. The data-burst is headed with a burst-

preamble, followed by the burst-payload. The burst-payload of each data-burst of MPEG-4

ALS data shall contain 1 complete MPEG-4 ALS frame. The length of the MPEG-4 ALS data-
burst depends on the encoded bit rate (which determines the MPEG-4 ALS frame length), see

IEC 61937-10.
4.3.23 MPEG-4 AAC LC in LATM/LOAS

The MPEG-4 AAC LC in LATM/LOAS bitstream consists of a sequence of frames. The data-

type of an MPEG-4 AAC LC in LATM/LOAS data-burst is 23 and the subdata-type is 1. The
data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload
of each data-burst of MPEG-4 AAC LC in LATM/LOAS data shall contain 1 complete MPEG-4
AAC LC in LATM/LOAS frame. The length of the MPEG-4 AAC LC in LATM/LOAS data-burst
depends on the encoded bit rate (which determines the MPEG-4 AAC LC in LATM/LOAS
frame length), see IEC 61937-11.
4.3.24 MPEG-4 HE AAC in LATM/LOAS
The MPEG-4 HE AAC in LATM/LOAS bitstream consists of a sequence of frames. The data-
type of an MPEG-4 HE AAC in LATM/LOAS data-burst is 23 and the subdata-type is 2. The
data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload
of each data-burst of MPEG-4 HE AAC in LATM/LOAS data shall contain 1 complete MPEG-4
HE AAC in LATM/LOAS frame. The length of the MPEG-4 HE AAC in LATM/LOAS data-burst
depends on the encoded bit rate (which determines the MPEG-4 HE AAC in LATM/LOAS
frame length), see IEC 61937-11.
4.3.25 DRA
The DRA bitstream consists of a sequence of frames. The data-type of a DRA data-burst is 23
and the subdata-type is 3. The data-burst is headed with a burst-preamble, followed by the
burst-payload. The burst-payload of each data-burst of DRA data shall contain 1 complete
DRA frame. The length of the DRA data-burst depends on the encoded bit rate (which
determines the DRA frame length), see IEC 61937-12.

___________
– 16 – 61937-2  CEI:2007+A1:2011

SOMMAIRE
AVANT-PROPOS . 17

INTRODUCTION (à l’Amendement 1) . 19

1 Domaine d’application . 20

2 Références normatives . 20

3 Termes, définitions et abréviations . 21

3.1 Termes et définitions . 21

3.2 Abréviations . 22
4 Salve d'informations . 22
4.1 Généralités. 22
4.2 Type-de-données et type de sous-données . 23
4.3 Salves-de-données audio . 25
4.3.1 Généralités . 26
4.3.2 AC-3 . 26
4.3.3 Trames MPEG-1 couche 1 . 27
4.3.4 Trames MPEG-1 couche 2 ou couche 3, ou trame MPEG-2
sans extension . 27
4.3.5 Trame MPEG-2 avec extension . 27
4.3.6 MPEG-2 AAC . 27
4.3.7 Faible fréquence d'échantillonnage MPEG-2 couche 1 . 27
4.3.8 Faible fréquence d'échantillonnage MPEG-2 couche 2 . 27
4.3.9 Faible fréquence d'échantillonnage MPEG-2 couche 3 . 27
4.3.10 DTS type I . 28
4.3.11 DTS type II . 28
4.3.12 DTS type III . 28
4.3.13 DTS type IV . 28
4.3.14 ATRAC . 28
4.3.15 ATRAC 2/3 . 28
4.3.16 ATRAC-X . 28
4.3.17 Faible fréquence d'échantillonnage MPEG-2 AAC . 28
4.3.18 MPEG-4 AAC . 29
4.3.19 Windows Media Audio Professional . 29

4.3.20 AC-3 amélioré . 29
4.3.21 MAT . 29
4.3.22 MPEG-4 ALS . 29
4.3.23 MPEG-4 AAC LC en LATM/LOAS . 29
4.3.24 MPEG-4 HE AAC en LATM/LOAS . 30
4.3.25 DRA . 30

Tableau 1 – Champs de la salve d’information . 23
Tableau 2 – Types-de-données . 24

61937-2  CEI:2007+A1:2011 – 17 –

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE

____________
AUDIONUMÉRIQUE –
INTERFACE POUR LES FLUX DE BITS AUDIO À CODAGE MIC

NON LINÉAIRE CONFORMÉMENT À LA CEI 60958 –

Partie 2: Salve d'informations

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (CEI) est une organisation mondial
...