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IEC 61937-11
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 11: MPEG-4 AAC and its extensions and MPEG-D USAC in LATM/LOAS
your local IEC member National Committee for further information.
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IEC 61937-11
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 11: MPEG-4 AAC and its extensions and MPEG-D USAC in LATM/LOAS
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.30; 33.170 ISBN 978-2-8322-9950-0
– 2 – IEC 61937-11:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 9
4 Mapping of the audio bit stream on to IEC 61937-1 . 10
4.1 General . 10
4.2 Burst-info for MPEG-4 AAC and its extensions and MPEG-D USAC in
LATM/LOAS . 10
5 Format of data-burst for MPEG-4 AAC and its extensions and MPEG-D USAC in
LATM/LOAS . 10
5.1 General . 10
5.2 Pause data-bursts for MPEG-4 AAC and its extensions in LATM/LOAS . 11
5.3 Audio data-bursts . 11
5.3.1 MPEG-4 AAC and its extensions in LATM/LOAS . 11
5.3.2 USAC in LATM/LOAS . 13
5.3.3 LATM/LOAS framing . 14
5.3.4 Latency . 15
Annex A (informative) Calculation of delay and data-burst repetition rates –
guidelines . 16
A.1 Examples . 16
A.2 Guidelines. 17
Annex B (normative) High-speed transmission . 18
B.1 Indication . 18
B.2 Example. 18
Annex C (informative) MPEG-4 and MPEG-D audio profiles and audio object types . 19
C.1 Overview. 19
C.2 MPEG-4 AAC Profile . 19
C.3 MPEG-4 High-Efficiency AAC Profile . 19
C.4 MPEG-4 High-Efficiency AAC v2 Profile . 19
C.5 MPEG-D Baseline USAC Profile . 20
C.6 MPEG-D Extended HE-AAC Profile . 20
Bibliography . 21
Figure 1 – Data-burst structure. 11
Figure 2 – Data-burst structure. 13
Figure 3 – Latency diagram for burst reception and decoding . 15
Figure C.1 – MPEG-4 /MPEG-D audio profiles structure . 19
Table 1 – Values for data-type bits 0-4 and data-type bits 5-6 . 10
Table 2 – Repetition period of pause data-bursts . 11
Table 3 – Data-type-dependent information for MPEG-4 AAC audio and its extensions
in LATM/LOAS . 12
Table 4 – Data-type-dependent information for USAC audio in LATM/LOAS . 14
Table A.1 – Examples – Calculation of delay and data-burst repetition rates for
AAC_LC and HE AAC . 16
Table A.2 – Examples – Calculation of delay and data-burst repetition rates for USAC . 17
Table B.1 – Indication fields . 18
Table B.2 – Signalling example . 18
– 4 – IEC 61937-11:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO – INTERFACE FOR NON-LINEAR PCM
ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 11: MPEG-4 AAC and its extensions
and MPEG-D USAC in LATM/LOAS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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IEC 61937-11 has been prepared by technical area 20: Analogue and digital audio, of IEC
technical committee 100: Audio, video and multimedia systems and equipment. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2010, and
Amendment 1:2018. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) MPEG-D USAC has been added.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3523/CDV 100/3582/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the IEC 61937 series, published under the general title Digital audio –
Interface for non-linear PCM encoded audio bitstreams applying IEC 60958, can be found on
the IEC website.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at /members_experts/refdocs. The main document types developed by IEC are
described in greater detail at /standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61937-11:2021 © IEC 2021
INTRODUCTION
Modern digital video broadcasting standards, such as DVB, include support for the MPEG-4
HE AAC and/or HE AAC v2 audio codecs specified in ISO/IEC 14496-3. An increasing number
of countries are adopting these new codecs for their standard-definition and high-definition
digital video broadcasting services and have started with
...