IEC 61937-2:2007+AMD1:2011 CSV

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

IEC 61937-2:2007+A1:2011 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. This consolidated version consists of the second edition (2007) and its amendment 1 (2011). Therefore, no need to order amendment in addition to this publication.

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+A1:2011 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.  Cette version consolidée comprend la deuxième édition (2007) et son amendement 1 (2011). Il n'est donc pas nécessaire de commander l'amendement avec cette publication.

General Information

• Status: Published
• Publication Date: 14-Dec-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.160.30 - Audio systems
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 08-Mar-2021

Standards Content (Sample)

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

IEC 61937-2:2007+A1:2011

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 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

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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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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.

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– 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.

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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.

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– 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
1
IEC 60958 – Part 9: Non-linear PCM bitstreams according to the MAT format
—————————
1
 To be published.

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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

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– 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.

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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.

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– 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.

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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
18
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
20
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
23
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

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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.).
...