IEC 61937-2:2007/AMD1:2011

Amendment 1 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info

Amendement 1 - Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire conformément à la CEI 60958 - Partie 2: Salve d'informations

General Information

• Status: Published
• Publication Date: 23-Oct-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

Relations

• Amends: IEC 61937-2:2007 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023
• Revised: IEC 61937-2:2021 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 2: Burst-info
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61937-2 ®
Edition 2.0 2011-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
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
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IEC 61937-2 ®
Edition 2.0 2011-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
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
INTERNATIONALE PRICE CODE
F
CODE PRIX
ICS 33.160.30 ISBN 978-2-88912-765-8

– 2 – 61937-2 Amend.1 © IEC:2011
FOREWORD
This amendment has been prepared by technical area 4: Digital system interfaces and
protocols, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
100/1811/CDV 100/1884/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
61937-2 Amend.1 © IEC:2011 – 3 –
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.
2 Normative references
Delete footnote 1 to IEC 61937-9.
Insert, in the list of normative references, the following new publications:
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
4.1 General
Replace the entire existing Table 1 by the following new Table 1:
Table 1 – Fields of burst-info
Bits of Value Contents
Pc
0-6 Data-type (defined in IEC 61937-1)
0-4 Conventional data-type
0-31 See Table 2
5-6 Subdata-type
0-3 See Table 2
7 Error-flag
0 Error-flag indicating a valid burst-payload
1 Error-flag indicating that the burst-payload may contain errors
8-12 Data-type-dependent info
13-15 0-7 Bit-stream-number
NOTE Refer to IEC 61937-1, 6.1.7 and 6.1.7.1.

– 4 – 61937-2 Amend.1 © IEC:2011
4.2 Data-type and subdata-type
Replace the entire existing subclause 4.2 and Table 2 by the following:
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.
Table 2 – Data-types
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
0 0 Null data See Note 1
1 0 AC-3 data R-AC-3 1 536
2 0 – 3 Refer to SMPTE 338M
3 0 Pause bit 0 of Pa See Note 2
4 0 MPEG-1 layer 1 data bit 0 of Pa 384
MPEG-1 layer 2 or 3 data or MPEG-2
5 0 bit 0 of Pa 1 152
without extension
6 0 MPEG-2 data with extension bit 0 of Pa 1 152
7 0 MPEG-2 AAC bit 0 of Pa 1 024
8 0 MPEG-2, layer-1 low sampling frequency bit 0 of Pa 768
9 0 MPEG-2, layer-2 low sampling frequency bit 0 of Pa 2 304
10 0 MPEG-2, layer-3 low sampling frequency bit 0 of Pa 1 152
11 0 DTS type I bit 0 of Pa 512
12 0 DTS type II bit 0 of Pa 1 024
13 0 DTS type III bit 0 of Pa 2 048
14 0 ATRAC bit 0 of Pa 512
15 0 ATRAC 2/3 bit 0 of Pa 1 024
16 0 ATRAC-X bit 0 of Pa 2 048
17 0 DTS type IV bit 0 of Pa See IEC 61937-5
0 WMA professional type I bit 0 of Pa *3 2 048
1 WMA professional type II bit 0 of Pa 2 048
2 WMA professional type III bit 0 of Pa 1 024
3 WMA professional type IV bit 0 of Pa 512
0 MPEG-2 AAC low sampling frequency bit 0 of Pa 2 048
19 1 MPEG-2 AAC low sampling frequency bit 0 of Pa 4 096
2 – 3 MPEG-2 AAC low sampling frequency reserved reserved
0 MPEG-4 AAC bit 0 of Pa 1 024
1 MPEG-4 AAC bit 0 of Pa 2 048
2 MPEG-4 AAC bit 0 of Pa 4 096
3 MPEG-4 AAC bit 0 of Pa 512
61937-2 Amend.1 © IEC:2011 – 5 –
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
21 0 Enhanced AC-3 bit 0 of Pa 6 144
22 0 MAT R-MAT 15 360
0 MPEG-4 ALS bit 0 of Pa See IEC 61937-10
1 MPEG-4 AAC LC in LATM/LOAS bit 0 of Pa See IEC 61937-11
2 MPEG-4 HE AAC in LATM/LOAS bit 0 of Pa See IEC 61937-11
3 DRA bit 0 of Pa See IEC 61937-12
96 – 107
Reserved (do not use until defined)
(24 – 26) (0 – 3)
27 – 30 0 – 3 Refer to SMPTE 338M
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
Add, after the existing subclause 4.3.21, the following new subclauses:
4.3.22 MPEG-4 ALS
The MPEG-4 ALS bitstream consists of a sequence of frames. The data-type of an MPEG-4
ALS data-burst is 23 and the subdata-type is 0. The data-burst is headed with a burst-
preamble, followed by the burst-payload. The burst-payload of each data-burst of MPEG-4
ALS data shall contain 1 complete MPEG-4 ALS frame. The length of the MPEG-4 ALS data-
burst depends on the encoded bit rate (which determines the MPEG-4 ALS frame length), see
IEC 61937-10.
4.3.23 MPEG-4 AAC LC in LATM/LOAS
The MPEG-4 AAC LC in LATM/LOAS bitstream consists of a sequence of frames. The data-
type of an MPEG-4 AAC LC in LATM/LOAS data-burst is 23 and the subdata-type is 1. The
data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload
of each data-burst of MPEG-4 AAC LC in LATM/LOAS data shall contain 1 complete MPEG-4
AAC LC in LATM/LOAS frame. The length of the MPEG-4 AAC LC in LATM/LOAS data-burst
depends on the encoded bit rate (which determines the MPEG-4 AAC LC in LATM/LOAS
frame length), see IEC 61937-11.
4.3.24 MPEG-4 HE AAC in LATM/LOAS
The MPEG-4 HE AAC in LATM/LOAS bitstream consists of a sequence of frames. The data-
type of an MPEG-4 HE AAC in LATM/LOAS data-burst is 23 and the subdata-type is 2. The
data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload
of each data-burst of MPEG-4 HE AAC in LATM/LOAS data shall contain 1 complete MPEG-4
HE AAC in LATM/LOAS frame. The length of the MPEG-4 HE AAC in LATM/LOAS data-burst
depends on the encoded bit rate (which determines the MPEG-4 HE AAC in LATM/LOAS
frame length), see IEC 61937-11.

– 6 – 61937-2 Amend.1 © IEC:2011
4.3.25 DRA
The DRA bitstream consists of a sequence of frames. The data-type of a DRA data-burst is 23
and the subdata-type is 3. The data-burst is headed with a burst-preamble, followed by the
burst-payload. The burst-payload of each data-burst of DRA data shall contain 1 complete
DRA frame. The length of the DRA data-burst depends on the encoded bit rate (which
determines the DRA frame length), see IEC 61937-12.

____________
– 8 – 61937-2 Amend.1 © CEI:2011
AVANT-PROPOS
Le présent amendement a été établi par le domaine technique 4: Digital system interfaces
and protocols , du comité d’études 100 de la CEI: Systèmes et appareils audio, vidéo et
multimédia.
Le texte de cet amendement est issu des documents suivants:
CDV Rapport de vote
100/1811/FDIS 100/1884/RVC
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cet amendement.
Le comité a décidé que le contenu de cet amendement et de la publication de base ne sera
pas modifié avant la date de stabilité indiquée sur le site web de la CEI sous
"http://webstore.iec.ch" dans les données relatives à la publication recherchée. A cette date,

la publication sera
• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
_____________
___________
Interfaces et protocoles pour les systèmes numériques.

61937-2 Amend.1 © CEI:2011 – 9 –
INTRODUCTION à l’Amendement 1
Il a fallu réviser la CEI 61937-2 (2007) dans le but d’ajouter la définition d'un nouveau type-
de-données, pour aligner la descr
...