IEC 61937-2:2021
(Main)Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
IEC 61937-2:2021 specifies the digital audio interface to convey non-linear PCM encoded audio bitstreams applying IEC 60958-1 and IEC 60958-3. This document specifies burst-info, which defines content information about the data contained in the burst-payload. IEC 61937-2:2021 cancels and replaces the second edition published in 2007, Amendment 1:2011 and Amendment 2:2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) new audio data-types of MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 and ACX HBR8 have been added;
b) extended data-type field in Pe has been activated.
Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire selon l'IEC 60958 - Partie 2: Informations relatives à la salve
L'IEC 61937-2:2021 spécifie l'interface audionumérique pour l'acheminement des flux de bits audio à codage MIC non linéaire selon l'IEC 60958-1 et l'IEC 60958-3. Le présent document spécifie les informations relatives à la salve, qui définissent les informations de contenu concernant les données contenues dans la charge utile de la salve. L'IEC 61937-2:2021 annule et remplace la deuxième édition parue en 2007, l'Amendement 1:2011 et l'Amendement 2:2018. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) les nouveaux types de données audio MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 et ACX HBR8 ont été ajoutés;
b) le champ de type de données étendu dans Pe a été activé.
General Information
Relations
Overview
IEC 61937-2:2021 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst‑info - defines the burst‑info elements used to identify and describe compressed (non‑linear PCM) audio bitstreams carried over consumer digital audio interfaces specified by IEC 60958 (for example S/PDIF and AES3 consumer usage). This third edition (2021) is a technical revision that cancels and replaces the 2007 edition and subsequent amendments. It clarifies how content information about the burst‑payload is signalled and adds new audio data‑types to reflect modern codecs.
Key topics and technical requirements
- Burst‑info structure: defines the fields that describe the content of a burst‑payload so receiving equipment can interpret and route compressed audio correctly.
- Data‑type, subdata‑type and extended data‑type: enumeration and use of these fields to identify specific codecs and stream formats. The 2021 edition has activated the extended data‑type field in Pe.
- Audio data‑bursts: normative descriptions for how different codec bitstreams are encapsulated in bursts (tables list supported formats).
- New audio data‑types: additions include MPEG‑D USAC, ACX, ACX HBR2, ACX HBR4 and ACX HBR8, enabling support for newer high‑efficiency and high‑bit‑rate audio formats.
- Normative references: links to IEC 60958‑1/‑3 and other parts of the IEC 61937 series that define format‑specific burst payload rules.
Note: This summary does not reproduce protocol bit‑level details; implementers should consult the full IEC 61937‑2:2021 text for mandatory field sizes, values and tables.
Practical applications and who uses this standard
- Audio and consumer electronics manufacturers (AV receivers, soundbars, Blu‑ray players) implementing digital input/output hardware that must carry compressed audio over S/PDIF or AES3.
- Firmware and driver developers who parse burst‑info to identify and demux incoming compressed streams for decoding or passthrough.
- Broadcast and content distribution engineers ensuring interoperability when transporting Dolby, MPEG, DTS and newer codec streams over digital links.
- Test labs and conformity assessors verifying correct burst encapsulation and metadata signalling against IEC requirements.
- System integrators and AV installers troubleshooting passthrough and format recognition issues between source devices and decoders.
Related standards (applicable)
- IEC 60958‑1 / IEC 60958‑3 - Digital audio interface (general and consumer applications)
- IEC 61937‑1 - General rules for non‑linear PCM bitstreams over IEC 60958
- Other parts of the IEC 61937 series (format‑specific rules for AC‑3, MPEG audio, DTS, AAC, MAT, AC‑4, MPEG‑H, etc.)
Keywords: IEC 61937-2:2021, burst-info, digital audio interface, non-linear PCM, IEC 60958, S/PDIF, data-type, MPEG-D USAC, ACX, audio data-bursts.
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Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 2: Burst-info
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IEC 61937-2 ®
Edition 3.0 2021-03
REDLINE 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 978-2-8322-9544-1
– 2 – IEC 61937-2:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION to Amendment 1 .
INTRODUCTION to Amendment 2 .
1 Scope . 7
2 Normative references . 7
3 Terms and definitions and abbreviations . 8
4 Burst-info . 10
4.1 General . 10
4.2 Data-type, subdata-type and extended data-type . 11
4.3 Audio data-bursts . 13
4.3.1 General . 13
4.3.2 AC-3 . 14
4.3.3 MPEG-1 layer-1 . 14
4.3.4 MPEG-1 layer-2 or layer-3 or MPEG-2 without extension . 14
4.3.5 MPEG-2 with extension . 14
4.3.6 MPEG-2 AAC . 14
4.3.7 MPEG-2 layer-1 low sampling frequency. 14
4.3.8 MPEG-2 layer-2 low sampling frequency. 14
4.3.9 MPEG-2 layer-3 low sampling frequency. 14
4.3.10 DTS type I . 15
4.3.11 DTS type II . 15
4.3.12 DTS type III . 15
4.3.13 DTS type IV . 15
4.3.14 ATRAC . 15
4.3.15 ATRAC 2/3 . 15
4.3.16 ATRAC-X . 15
4.3.17 MPEG-2 AAC low sampling frequency . 15
4.3.18 MPEG-4 AAC . 15
4.3.19 Windows Media Audio professional . 16
4.3.20 Enhanced AC-3 . 16
4.3.21 MAT . 16
4.3.22 MPEG-4 ALS . 16
4.3.23 MPEG-4 AAC LC in LATM/LOAS . 16
4.3.24 MPEG-4 HE AAC in LATM/LOAS . 17
4.3.25 DRA . 17
4.3.26 ATRAC-X low latency . 17
4.3.27 MPEG-H 3D Audio . 17
4.3.28 AC-4, AC-4 HBR4, AC-4 HBR16 and AC-4 LD . 17
4.3.29 MPEG-4 ALS in LATM/LOAS . 17
4.3.30 MPEG-D USAC in LATM/LOAS . 18
4.3.31 ACX, ACX HBR2, ACX HBR4 and ACX HBR8 . 18
Bibliography . 19
Table 1 – Fields of burst-info . 11
Table 2 – Data-types. 11
Table 3 – Extended data-types . 13
– 4 – IEC 61937-2:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO – INTERFACE FOR NON-LINEAR PCM
ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 –
Part 2: Burst-info
FOREWORD
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 61937-2:2007+AMD1:2011+AMD2:2018 CSV. A vertical
bar appears in the margin wherever a change has been made. Additions are in green text,
deletions are in strikethrough red text.
IEC 61937-2 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 third edition cancels and replaces the second edition published in 2007,
Amendment 1:2011 and Amendment 2:2018. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) new audio data-types of MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 and ACX HBR8 have
been added;
b) extended data-type field in Pe has been activated.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3459/CDV 100/3541/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.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
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at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 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.
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– 6 – IEC 61937-2:2021 RLV © IEC 2021
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.
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 document specifies burst-info,
which defines content information about the data contained in the burst-payload.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 61937-1:20072021, 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
– 8 – IEC 61937-2:2021 RLV © IEC 2021
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
IEC 61937-15, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 15: Non-linear PCM bit streams according to Auro-Cx 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 and definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
audio data-burst
data-burst with an encoded audio frame as burst-payload
3.2
audio data-word
16-bit data-word
3.3
audio frame
fixed number of audio samples
Note 1 to entry: The number of samples in an audio frame is dependent on the particular encoding system that is
used to encode the audio frame into the encoded audio frame.
3.4
audio gap
period in the sequence of baseband audio samples where valid samples of audio are not
available
3.5
bitstream
non-linear PCM encoded audio source, represented in a sequence of bits
Note 1 to entry: In this interface, the bitstream consists of a sequence of data-bursts.
3.6
data-burst
packet of data, including the burst-preamble, to be transmitted across the interface
3.7
burst-payload
information content of the data-burst
3.8
burst-preamble
header for the data-burst, containing synchronization and information about the data contained
in the burst-payload
3.9
data-type
reference to the type of payload of the data-bursts
3.10
encoded audio frame
minimum decodable unit of an encoded data sequence
Note 1 to entry: Each encoded audio frame is the encoded representation of a fixed number of audio samples (for
each original audio channel). The number of samples that are encoded into an encoded audio frame depends on the
particular encoding system used to encode the audio frame into the encoded audio frame.
3.11
length-code
length of the data-burst-payload in bits, bytes or 8-bytes 8 byte units
3.12
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
3.13
sampling frequency
sampling frequency of the encoded PCM audio samples (i.e. before encoding and after
decoding)
3.14
sampling period
period related to the sampling frequency of the PCM audio samples, represented in the encoded
bitstream
– 10 – IEC 61937-2:2021 RLV © IEC 2021
3.15
stuffing
occupying occupation of the unused data capacity of the interface
3.16
stuffing sub-frame
occupying occupation of the unused data capacity in 16-bit audio data-words
3.17
stream gap
period within the encoded audio bitstream without any audio frame; a discontinuity in the
bitstream
Note 1 to entry: 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 are specified in Table 1.
Table 1 – Fields of burst-info
Bits of Pc Value Contents
0 to 6 Data-type (defined in IEC 61937-1)
0 to 4 Conventional data-type
0 to 31 See Table 2
5 to 6 Subdata-type
0 to 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 8 to 2 Data-type-dependent info
13 to 15 0 to 7 Bit-stream-number
NOTE Refer to IEC 61937-1:2021, 6.1.7 6.1.8.1 and 6.1.7.1 6.1.8.2.
4.2 Data-type, subdata-type and extended data-type
Data-type defined in Pc bits 0-6 in IEC 61937-1 consists of conventional data-type (0 to 4) and
sub-data-type (5 to 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.
Extended data-type is defined in Pe bits 0 to 15 in IEC 61937-1. All extended data-types are
defined in Table 3.
Table 2 – Data-types
Data-type Contents Reference Repetition period Units of Pd
value of Pc bit 0 to 6 point R of data-burst
measured in
Conventional Subdata-
IEC 60958 frames
data-type type
Value of Value of
data-type data-type
bits 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 to 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 bits
8 0 bit 0 of Pa 768
sampling frequency
MPEG-2, layer-2 low bits
9 0 bit 0 of Pa 2 304
sampling frequency
MPEG-2, layer-3 low bits
10 0 bit 0 of Pa 1 152
sampling frequency
11 0 DTS type I bit 0 of Pa 512 bits
– 12 – IEC 61937-2:2021 RLV © IEC 2021
Data-type Contents Reference Repetition period Units of Pd
value of Pc bit 0 to 6 point R of data-burst
measured in
Conventional Subdata-
IEC 60958 frames
data-type type
Value of Value of
data-type data-type
bits bits
0 to 4 5 to 6
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
17 0 DTS type IV bit 0 of Pa See IEC 61937-5 bytes
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
MPEG-2 AAC low sampling
bits
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 to 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
0 MPEG-4 ALS bit 0 of Pa See IEC 61937-10 8-bytes
MPEG-4 AAC LC in bits
1 bit 0 of Pa See IEC 61937-11
LATM/LOAS
MPEG-4 HE AAC in bits
2 bit 0 of Pa See IEC 61937-11
LATM/LOAS
3 DRA bit 0 of Pa See IEC 61937-12 bits
0 AC-4 bit 0 of Pa See IEC 61937-14 bytes
1 AC-4 HBR4 bit 0 of Pa See IEC 61937-14 bytes
2 AC-4 HBR16 bit 0 of Pa See IEC 61937-14 8-bytes
3 AC-4 LD bit 0 of Pa See IEC 61937-14 bytes
Data-type Contents Reference Repetition period Units of Pd
value of Pc bit 0 to 6 point R of data-burst
measured in
Conventional Subdata-
IEC 60958 frames
data-type type
Value of Value of
data-type data-type
bits bits
0 to 4 5 to 6
0 MPEG-H 3D Audio bit 0 of Pa See IEC 61937-13 bytes
1 MPEG-H 3D Audio HBR bit 0 of Pa See IEC 61937-13 8-bytes
2 MPEG-4 ALS in LATM/LOAS bit 0 of Pa See IEC 61937-10 8-bytes
Reserved (do not use until bits
defined)
3 bit 0 of Pa See IEC 61937-11
MPEG-D USAC
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
31 0 – 3
use until defined)
0 ACX bit 0 of Pa See IEC 61937-15 bytes
1 ACX HBR2 bit 0 of Pa See IEC 61937-15 bytes
2 ACX HBR4 bit 0 of Pa See IEC 61937-15 bytes
3 ACX HBR8 bit 0 of Pa See IEC 61937-15 bytes
27 to 30 0 to 3 Refer to SMPTE ST 338 bits
Extended data-type (see
table 3)
Extended data-type (do not
1 to 3
use until defined)
a
Refer to IEC 61937-1:20072021, 7.3 7.4.
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.
Table 3 – Extended data-types
Extended data-type Contents Reference Repetition period of Units of Pd
value of Pe bit 0 to 15 point R data-burst measured
in IEC 60958 frames
0 to 65 535 Reserved for future use
4.3 Audio data-bursts
4.3.1 General
Subclause 4.3 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.
– 14 – IEC 61937-2:2021 RLV © IEC 2021
4.3.2 AC-3
The AC-3 bitstream consists of a sequence of AC-3-frames syncframes. 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 syncframe
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 syncframe.
The length of the AC-3 data-burst will depend on the encoded bit rate (which determines the
AC-3-frame syncframe 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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-type 0 or it represents
4 096 samples of each encoded channel and can be transferred using data-type 19 and sub-
data-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 sub-data-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 sub-data-type 2.
– 16 – IEC 61937-2:2021 RLV © IEC 2021
The payload of MPEG-4 AAC represents 512 samples of each encoded channel and can be
transferred using data-type 20 and sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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.
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 sub-data-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 sub-data-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 sub-data-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 sub-data-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.
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.
EG-4 ALS in LATM/LOAS
4.3.29 MP
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 in LATM/LOAS
frame length); see IEC 61937-10.
– 18 – IEC 61937-2:2021 RLV © IEC 2021
4.3.30 MPEG-D USAC in LATM/LOAS
The MPEG-D USAC in LATM/LOAS bitstream consists of a sequence of frames. The value of
data-type bits 0 to 4 of an MPEG-D USAC in LATM/LOAS data-burst is 25, 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 MPEG-D USAC in LATM/LOAS data shall
contain one complete MPEG-D USAC in LATM/LOAS frame. The length of the MPEG-D USAC
in LATM/LOAS data-burst depends on the encoded bit rate (which determines the MPEG-D
USAC in LATM/LOAS frame length), see IEC 61937-11.
4.3.31 ACX, ACX HBR2, ACX HBR4 and ACX HBR8
The Auro-Cx (ACX) bitstream consists of a sequence of blocks (or frames). The value of data-
type bits 0 to 4 of an ACX data burst is 26, and the value of data-type bits 5 to 6 is 0. The value
of data-type bits 0 to 4 of an ACX HBR2 data burst is 26, and the value of data-type bits 5 to 6
is 1. The value of data-type bits 0 to 4 of an ACX HBR4 data burst is 26, and the value of data-
type bits 5 to 6 is 2. The value of data-type bits 0 to 4 of an ACX HBR8 data burst is 26, and
the value of data-type bits 5 to 6 is 3. The data is headed with a burst pre-ample, followed by
the burst-payload. The burst payload of each data-burst of Auro-Cx data shall contain one
complete Auro-Cx block. The length of the Auro-Cx data-burst depends on the encoded bit rate
(which determines the Auro-Cx block length); see IEC 61937-15.
Bibliography
SMPTE ST 338, Format for Non-PCM Audio and Data in AES3 – Data Types
___________
IEC 61937-2 ®
Edition 3.0 2021-03
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 selon l'IEC 60958 –
Partie 2: Informations relatives à la salve
– 2 – IEC 61937-2:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope .
...
IEC 61937-2 ®
Edition 3.0 2021-03
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 selon l'IEC 60958 –
Partie 2: Informations relatives à la salve
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IEC 61937-2 ®
Edition 3.0 2021-03
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 selon l'IEC 60958 –
Partie 2: Informations relatives à la salve
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.30 ISBN 978-2-8322-9522-9
– 2 – IEC 61937-2:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Burst-info . 8
4.1 General . 8
4.2 Data-type, subdata-type and extended data-type . 8
4.3 Audio data-bursts . 10
4.3.1 General . 10
4.3.2 AC-3 . 10
4.3.3 MPEG-1 layer-1 . 11
4.3.4 MPEG-1 layer-2 or layer-3 or MPEG-2 without extension . 11
4.3.5 MPEG-2 with extension . 11
4.3.6 MPEG-2 AAC . 11
4.3.7 MPEG-2 layer-1 low sampling frequency. 11
4.3.8 MPEG-2 layer-2 low sampling frequency. 11
4.3.9 MPEG-2 layer-3 low sampling frequency. 11
4.3.10 DTS type I . 11
4.3.11 DTS type II . 11
4.3.12 DTS type III . 12
4.3.13 DTS type IV . 12
4.3.14 ATRAC . 12
4.3.15 ATRAC 2/3 . 12
4.3.16 ATRAC-X . 12
4.3.17 MPEG-2 AAC low sampling frequency . 12
4.3.18 MPEG-4 AAC . 12
4.3.19 Windows Media Audio professional . 12
4.3.20 Enhanced AC-3 . 13
4.3.21 MAT . 13
4.3.22 MPEG-4 ALS . 13
4.3.23 MPEG-4 AAC LC in LATM/LOAS . 13
4.3.24 MPEG-4 HE AAC in LATM/LOAS . 13
4.3.25 DRA . 14
4.3.26 ATRAC-X low latency . 14
4.3.27 MPEG-H 3D Audio . 14
4.3.28 AC-4, AC-4 HBR4, AC-4 HBR16 and AC-4 LD . 14
4.3.29 MPEG-4 ALS in LATM/LOAS . 14
4.3.30 MPEG-D USAC in LATM/LOAS . 14
4.3.31 ACX, ACX HBR2, ACX HBR4 and ACX HBR8 . 15
Bibliography . 16
Table 1 – Fields of burst-info . 8
Table 2 – Data-types. 9
Table 3 – Extended data-types . 10
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
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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.
IEC 61937-2 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 third edition cancels and replaces the second edition published in 2007,
Amendment 1:2011 and Amendment 2:2018. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) new audio data-types of MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 and ACX HBR8 have
been added;
b) extended data-type field in Pe has been activated.
– 4 – IEC 61937-2:2021 © IEC 2021
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3459/CDV 100/3541/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.
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 www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 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.
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 document specifies burst-info,
which defines content information about the data contained in the burst-payload.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 61937-1:2021, 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
– 6 – IEC 61937-2:2021 © IEC 2021
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
IEC 61937-15, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 15: Non-linear PCM bit streams according to Auro-Cx format
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
audio data-burst
data-burst with an encoded audio frame as burst-payload
3.2
audio data-word
16-bit data-word
3.3
audio frame
fixed number of audio samples
Note 1 to entry: The number of samples in an audio frame is dependent on the particular encoding system that is
used to encode the audio frame into the encoded audio frame.
3.4
audio gap
period in the sequence of baseband audio samples where valid samples of audio are not
available
3.5
bitstream
non-linear PCM encoded audio source, represented in a sequence of bits
Note 1 to entry: In this interface, the bitstream consists of a sequence of data-bursts.
3.6
data-burst
packet of data, including the burst-preamble, to be transmitted across the interface
3.7
burst-payload
information content of the data-burst
3.8
burst-preamble
header for the data-burst, containing synchronization and information about the data contained
in the burst-payload
3.9
data-type
reference to the type of payload of the data-bursts
3.10
encoded audio frame
minimum decodable unit of an encoded data sequence
Note 1 to entry: Each encoded audio frame is the encoded representation of a fixed number of audio samples (for
each original audio channel). The number of samples that are encoded into an encoded audio frame depends on the
particular encoding system used to encode the audio frame into the encoded audio frame.
3.11
length-code
length of the data-burst-payload in bits, bytes or 8-byte units
3.12
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
3.13
sampling frequency
frequency of the encoded PCM audio samples (i.e. before encoding and after decoding)
3.14
sampling period
period related to the sampling frequency of the PCM audio samples, represented in the encoded
bitstream
3.15
stuffing
occupation of the unused data capacity of the interface
3.16
stuffing sub-frame
occupation of the unused data capacity in 16-bit audio data-words
3.17
stream gap
period within the encoded audio bitstream without any audio frame; a discontinuity in the
bitstream
Note 1 to entry: Typically, a stream gap will occur between encoded audio frames.
– 8 – IEC 61937-2:2021 © IEC 2021
4 Burst-info
4.1 General
The 16-bit burst-info contains information about the data found in the data-burst. Fields of burst-
info are specified in Table 1.
Table 1 – Fields of burst-info
Bits of Pc Value Contents
0 to 6 Data-type (defined in IEC 61937-1)
0 to 4 Conventional data-type
0 to 31 See Table 2
5 to 6 Subdata-type
0 to 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 to 2 Data-type-dependent info
13 to 15 0 to 7 Bit-stream-number
NOTE Refer to IEC 61937-1:2021, 6.1.8.1 and 6.1.8.2.
4.2 Data-type, subdata-type and extended data-type
Data-type defined in Pc bits 0-6 in IEC 61937-1 consists of conventional data-type (0 to 4) and
sub-data-type (5 to 6) for historical reasons. All conventional data-types and subdata-types are
defined in Table 2.
Extended data-type is defined in Pe bits 0 to 15 in IEC 61937-1. All extended data-types are
defined in Table 3.
Table 2 – Data-types
Data-type Contents Reference Repetition period Units of
value of Pc bit 0 to 6 point R of data-burst Pd
measured in
Conventional Subdata-
IEC 60958 frames
data-type type
Value of data- Value of
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 to 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
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
17 0 DTS type IV bit 0 of Pa See IEC 61937-5 bytes
c
bits
0 WMA professional type I bit 0 of Pa 2 048
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
MPEG-2 AAC low sampling bits
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 to 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
0 MPEG-4 ALS bit 0 of Pa See IEC 61937-10 8-bytes
1 MPEG-4 AAC LC in LATM/LOAS bit 0 of Pa See IEC 61937-11 bits
2 MPEG-4 HE AAC in LATM/LOAS bit 0 of Pa See IEC 61937-11 bits
3 DRA bit 0 of Pa See IEC 61937-12 bits
– 10 – IEC 61937-2:2021 © IEC 2021
Data-type Contents Reference Repetition period Units of
value of Pc bit 0 to 6 point R of data-burst Pd
measured in
Conventional Subdata-
IEC 60958 frames
data-type type
Value of data- Value of
type bits data-
type bits
0 to 4
5 to 6
0 AC-4 bit 0 of Pa See IEC 61937-14 bytes
1 AC-4 HBR4 bit 0 of Pa See IEC 61937-14 bytes
2 AC-4 HBR16 bit 0 of Pa See IEC 61937-14 8-bytes
3 AC-4 LD bit 0 of Pa See IEC 61937-14 bytes
0 MPEG-H 3D Audio bit 0 of Pa See IEC 61937-13 bytes
1 MPEG-H 3D Audio HBR bit 0 of Pa See IEC 61937-13 8-bytes
2 MPEG-4 ALS in LATM/LOAS bit 0 of Pa See IEC 61937-10 8-bytes
3 MPEG-D USAC bit 0 of Pa See IEC 61937-11 bits
0 ACX bit 0 of Pa See IEC 61937-15 bytes
1 ACX HBR2 bit 0 of Pa See IEC 61937-15 bytes
2 ACX HBR4 bit 0 of Pa See IEC 61937-15 bytes
3 ACX HBR8 bit 0 of Pa See IEC 61937-15 bytes
27 to 30 0 to 3 Refer to SMPTE ST 338 bits
0 Extended data-type (see table 3)
Extended data-type (do not use
1 to 3
until defined)
a
Refer to IEC 61937-1:2021, 7.4.
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.
Table 3 – Extended data-types
Extended data-type Contents Reference Repetition period of Units of Pd
value of Pe bit 0 to 15 point R data-burst measured
in IEC 60958 frames
0 to 65 535 Reserved for future use
4.3 Audio data-bursts
4.3.1 General
Subclause 4.3 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 syncframes. 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 syncframe 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 syncframe.
The length of the AC-3 data-burst will depend on the encoded bit rate (which determines the
AC-3 syncframe length). The specification for the AC-3 bitstream 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 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 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 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 sub-data-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see 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 sub-data-type 0. The data-burst
is headed with a burst-preamble, followed by the burst-payload; see 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 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 sub-data-type 0. The
data-burst is headed with a burst-preamble, followed by the burst-payload; see 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 sub-data-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 sub-data-type 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload; see IEC 61937-5.
– 12 – IEC 61937-2:2021 © IEC 2021
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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-type 0 or it represents
4 096 samples of each encoded channel and can be transferred using data-type 19 and sub-
data-type 1. The data-burst is headed with a burst-preamble, followed by the burst-payload;
see 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 sub-data-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 sub-data-type 2.
The payload of MPEG-4 AAC represents 512 samples of each encoded channel and can be
transferred using data-type 20 and sub-data-type 3.
The data-burst is headed with a burst-preamble, followed by the burst-payload; see 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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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 sub-data-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.
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 sub-data-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 sub-data-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 sub-data-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.
– 14 – IEC 61937-2:2021 © IEC 2021
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 sub-data-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.
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.
EG-4 ALS in LATM/LOAS
4.3.29 MP
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 in LATM/LOAS
frame length); see IEC 61937-10.
4.3.30 MPEG-D USAC in LATM/LOAS
The MPEG-D USAC in LATM/LOAS bitstream consists of a sequence of frames. The value of
data-type bits 0 to 4 of an MPEG-D USAC in LATM/LOAS data-burst is 25, 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 MPEG-D USAC in LATM/LOAS data shall
contain one complete MPEG-D USAC in LATM/LOAS frame. The length of the MPEG-D USAC
in LATM/LOAS data-burst depends on the encoded bit rate (which determines the MPEG-D
USAC in LATM/LOAS frame length), see IEC 61937-11.
4.3.31 ACX, ACX HBR2, ACX HBR4 and ACX HBR8
The Auro-Cx (ACX) bitstream consists of a sequence of blocks (or frames). The value of data-
type bits 0 to 4 of an ACX data burst is 26, and the value of data-type bits 5 to 6 is 0. The value
of data-type bits 0 to 4 of an ACX HBR2 data burst is 26, and the value of data-type bits 5 to 6
is 1. The value of data-type bits 0 to 4 of an ACX HBR4 data burst is 26, and the value of data-
type bits 5 to 6 is 2. The value of data-type bits 0 to 4 of an ACX HBR8 data burst is 26, and
the value of data-type bits 5 to 6 is 3. The data is headed with a burst pre-ample, followed by
the burst-payload. The burst payload of each data-burst of Auro-Cx data shall contain one
complete Auro-Cx block. The length of the Auro-Cx data-burst depends on the encoded bit rate
(which determines the Auro-Cx block length); see IEC 61937-15.
– 16 – IEC 61937-2:2021 © IEC 2021
Bibliography
SMPTE ST 338, Format for Non-PCM Audio and Data in AES3 – Data Types
___________
– 18 – IEC 61937-2:2021 © IEC 2021
SOMMAIRE
AVANT-PROPOS . 19
1 Domaine d'application . 21
2 Références normatives . 21
3 Termes et définitions . 22
4 Informations relatives à la salve . 24
4.1 Généralités . 24
4.2 Type de données, sous-type de données et type de données étendu . 24
4.3 Salves de données audio . 26
4.3.1 Généralités . 26
4.3.2 AC-3 . 27
4.3.3 MPEG-1 couche 1. 27
4.3.4 MPEG-1 couche 2 ou 3 ou MPEG-2 sans extension . 27
4.3.5 MPEG-2 avec extension . 27
4.3.6 MPEG-2 AAC . 27
4.3.7 MPEG-2 couche 1 à fréquence d'échantillonnage faible . 27
4.3.8 MPEG-2 couche 2 à fréquence d'échantillonnage faible . 27
4.3.9 MPEG-2 couche 3 à fréquence d'échantillonnage faible . 28
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 .
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Frequently Asked Questions
IEC 61937-2:2021 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info". This standard covers: IEC 61937-2:2021 specifies the digital audio interface to convey non-linear PCM encoded audio bitstreams applying IEC 60958-1 and IEC 60958-3. This document specifies burst-info, which defines content information about the data contained in the burst-payload. IEC 61937-2:2021 cancels and replaces the second edition published in 2007, Amendment 1:2011 and Amendment 2:2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) new audio data-types of MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 and ACX HBR8 have been added; b) extended data-type field in Pe has been activated.
IEC 61937-2:2021 specifies the digital audio interface to convey non-linear PCM encoded audio bitstreams applying IEC 60958-1 and IEC 60958-3. This document specifies burst-info, which defines content information about the data contained in the burst-payload. IEC 61937-2:2021 cancels and replaces the second edition published in 2007, Amendment 1:2011 and Amendment 2:2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) new audio data-types of MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 and ACX HBR8 have been added; b) extended data-type field in Pe has been activated.
IEC 61937-2:2021 is classified under the following ICS (International Classification for Standards) categories: 33.160.30 - Audio systems. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61937-2:2021 has the following relationships with other standards: It is inter standard links to IEC 61937-2:2007, IEC 61937-2:2007/AMD2:2018, IEC 61937-2:2007/AMD1:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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The article discusses IEC 61937-2:2021, which is a standard that specifies the digital audio interface for transmitting non-linear PCM encoded audio bitstreams. It applies the standards IEC 60958-1 and IEC 60958-3. The article mentions that this new edition cancels and replaces previous editions and includes technical revisions. It highlights two significant changes in this edition: the addition of new audio data-types and the activation of the extended data-type field.
IEC 61937-2:2021は、IEC 60958-1およびIEC 60958-3を適用し、非線形PCM符号化オーディオビットストリームを伝送するためのデジタルオーディオインターフェースを規定する規格です。この文書では、バーストペイロードに含まれるデータに関するコンテンツ情報を定義するバーストインフォを指定しています。この新しい版は、2007年に発行された第2版、2011年の改訂1、2018年の改訂2を取り消し、置き換えるものであり、技術的な改訂が含まれています。この版には、次の重要な技術的変更が含まれています：a）新しいオーディオデータタイプであるMPEG-D USAC、ACX、ACX HBR2、ACX HBR4、およびACX HBR8が追加されました。b）Peの拡張データタイプフィールドが活性化されました。
The article discusses the release of IEC 61937-2:2021, a standard for the digital audio interface used to transmit non-linear PCM encoded audio bitstreams. This document specifically focuses on burst-info, which provides information about the content of the data within the burst-payload. This new edition of the standard replaces previous versions and includes technical revisions such as the addition of new audio data types and activation of an extended data-type field.
제목: IEC 61937-2:2021 - 디지털 오디오 - IEC 60958을 적용한 비선형 PCM 인코딩 오디오 비트스트림 인터페이스 - 파트 2: 버스트 정보 내용: IEC 61937-2:2021은 이전 판과의 기술적 내용 변경을 보여주는 리드라인 버전과 함께 제공되는 IEC 61937-2:2021 RLV로 이용 가능하다. 이 문서는 IEC 60958-1 및 IEC 60958-3을 적용하여 비선형 PCM 인코딩 오디오 비트스트림을 전달하기 위한 디지털 오디오 인터페이스를 명시한다. 이 문서는 버스트 페이로드 내에 포함된 데이터에 대한 내용 정보를 정의하는 버스트 정보를 명시한다. IEC 61937-2:2021은 2007년에 발간된 제2판과 2011년 개정 1판, 2018년 개정 2판을 대체하며 기술적인 개정을 포함한다. 이 새로운 판에는 다음과 같은 중요한 기술적 변경 사항이 포함되어 있다: a) MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 및 ACX HBR8의 새로운 오디오 데이터 유형이 추가되었다. b) Pe의 확장 데이터 유형 필드가 활성화되었다.
記事タイトル: IEC 61937-2:2021 - デジタルオーディオ - IEC 60958を適用した非線形PCMエンコードオーディオビットストリームのインターフェース - パート2：バースト情報 記事内容: IEC 61937-2:2021は、以前の版との技術的内容の変更を示すリードラインバージョンとして提供されるIEC 61937-2:2021 RLVが利用可能です。この文書は、IEC 60958-1およびIEC 60958-3を適用して非線形PCMエンコードオーディオビットストリームを伝送するためのデジタルオーディオインターフェースを規定しています。この文書では、バーストペイロード内のデータに関するコンテンツ情報を定義するバースト情報を規定しています。IEC 61937-2:2021は、2007年に発行された第2版、2011年の改訂1版、2018年の改訂2版を取り消し、代わりに技術的な改訂を含んでいます。この新版には、次の重要な技術的変更が含まれています：a）MPEG-D USAC、ACX、ACX HBR2、ACX HBR4、ACX HBR8の新しいオーディオデータタイプが追加されました。b）Peの拡張データタイプフィールドが有効化されました。
IEC 61937-2:2021은 IEC 60958을 적용하여 비선형 PCM 인코딩된 오디오 비트스트림을 전송하기 위한 디지털 오디오 인터페이스를 명시하는 표준입니다. 이 문서는 버스트-페이로드에 포함된 데이터에 대한 내용 정보를 정의하는 burst-info를 명시합니다. 2007년에 발표된 두 번째 판, 2011년 개정안 1, 2018년 개정안 2를 대체하며, 기술적인 수정을 포함한 테크니컬 리비전입니다. 이 버전에는 다음과 같은 중요한 기술적인 변경 사항이 포함되어 있습니다: a) MPEG-D USAC, ACX, ACX HBR2, ACX HBR4 및 ACX HBR8의 새로운 오디오 데이터 유형이 추가되었습니다. b) Pe의 확장된 데이터 유형 필드가 활성화되었습니다.
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