Bsi bs en 61937 6 2006 + a1 2014

BRITISH STANDARD

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
audio formats
MPEG-4 AAC formats

The European Standard EN 61937-6:2006 has the status of a British
Standard

ICS 33.160.60; 35.040





















BS EN
EN
61937-6:2006
61937-6:2006

+A1:2014


BS EN 61937-6:2006+A1:2014

National foreword
This British Standard is the UK implementation of EN 61937-6:2006+A1:2014.
It is identical to IEC 61937-6:2006, incorporating amendment 1:2014. It
supersedes BS EN 61937-6:2006, which is withdrawn.
The start and finish of text introduced or altered by amendment is indicated
in the text by tags. Tags indicating changes to IEC text carry the number
of the IEC amendment. For example, text altered by IEC amendment A1 is
indicated by .
The UK participation in its preparation was entrusted to Technical Committee
EPL/100, Audio, video and multimedia systems and equipment.
A list of organizations represented on this committee can be obtained on
request to its secretary.
The publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from
legal obligations.

This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 31 October 2006
© The British Standards
Institution 2014.
Published by BSI Standards

Limited 2014

ISBN 978 0 580 81636 9

Amendments/corrigenda issued since publication
Date

Comments

30 June 2014

Implementation of IEC amendment 1:2014 with
CENELEC endorsement A1:2014. Annex ZA updated


EUROPEAN STANDARD
NORME EUROPÉENNE

EN 61937-6
61937-6:2006+A1

EUROPÄISCHE NORM

April 2006
2014
July

ICS 33.160.60, 35.040

Supersedes EN 61937-6:2002

English version

Digital audio –
Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958
Part
Part 6:
6: Non-linear
Non-linear PCM
PCM bitstreams according
according to
to the
the MPEG-2
MPEG-2 AAC
AAC
formats
andand MPEG-4
MPEG-4 AAC
audio
formats
(IEC 61937-6:2006)
Audionumérique –
Interface pour les flux de bits audio
à codage MIC non linéaire,
conformément à la CEI 60958
Partie 6: Flux de bits MIC non linéaire
selon les formats MPEG-2 AAC
et MPEG-4 AAC
(CEI 61937-6:2006)

Digitalton –
Schnittstelle für nichtlinear-PCM-codierte
Audio-Bitströme unter Verwendung
von IEC 60958
Teil 6: Nichtlineare PCM-Bitströme
nach MPEG-2 AAC- und MPEG-4 AACAudio-Formaten
(IEC 61937-6:2006)

This European Standard was approved by CENELEC on 2006-07-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in two official versions (English and German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2006 CENELEC
-

All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61937-6:2006 E


EN 61937-6:2006
EN
61937-6:2006
BS EN
61937-6:2006+A1:2014
EN
61937-6:2006
EN 61937-6:2006+A1:2014
EN 61937-6:2006

–2–
–2–
–- 2
2 -–
Foreword
–2–

Foreword
Foreword prepared by IEC TC 100, Audio, video and
The text of the International Standard IEC 61937-6:2006,
Foreword prepared by IEC TC 100, Audio, video and
The
text ofsystems
the International
Standard

61937-6:2006,
multimedia
and equipment,
wasIEC
submitted
to the formal vote and was approved by CENELEC as
The
text ofsystems
the
International
Standard
IEC
61937-6:2006,
prepared
by IEC
100, Audio,
video and
multimedia
and equipment,
wasmodification.
submitted
to the formal
vote and
was TC
approved
by CENELEC
as
EN 61937-6
on 2006-07-01
without

any
The
text ofsystems
the
International
Standard
IEC
61937-6:2006,
prepared
by IEC
100, Audio,
video and
multimedia
and equipment,
wasmodification.
submitted
to the formal
vote and
was TC
approved
by CENELEC
as
EN 61937-6
on 2006-07-01
without
any
multimedia
and equipment,
wasmodification.
submitted to the formal vote and was approved by CENELEC as

EN 61937-6systems
on 2006-07-01
without any
This European Standard supersedes EN 61937-6:2002.
EN 61937-6
on Standard
2006-07-01
without any
This
European
supersedes
ENmodification.
61937-6:2002.
This European Standard supersedes EN 61937-6:2002.
It includes the following significant technical changes with respect to EN 61937-6:2002:
This
European
Standardsignificant
supersedes
EN 61937-6:2002.
It
includes
the following
technical
changes with respect to EN 61937-6:2002:
It includes the following significant technical changes with respect to EN 61937-6:2002:
a) addition of data-type for MPEG2 AAC low sampling frequency;
It
theoffollowing
significant

technical
changes
withfrequency;
respect to EN 61937-6:2002:
a)includes
addition
data-type
for MPEG2
AAC low
sampling
a)
b)
a)
b)

addition of data-type for MPEG2 AAC low sampling frequency;
additon of data-type for MPEG-4 AAC.
addition
of data-type
data-type for
for MPEG-4
MPEG2 AAC
additon of
AAC.low sampling frequency;

b) additon of data-type for MPEG-4 AAC.
The following dates were fixed:
b) following
additon ofdates
data-type

MPEG-4 AAC.
The
were for
fixed:
The
following
were
fixed:
– latest
date dates
by which
the
EN has to be implemented
The
following
dates
were
fixed:
– latest
date
by
which
the
EN hasoftoanbeidentical
implemented
at national level by publication
– latest
date
by
which

the
EN
has
to
be
at
national
level
by
publication
of
an
identical
national standard or by endorsement implemented
– latest
date
by
which
the
EN hasoftoanbeidentical
implemented
at
national
level
byorpublication
national
standard
by endorsement
at
national

level
by
publication
of
an
identical
national
standard
or
by
endorsement
– latest date by which the national standards conflicting
national
standard
or be
by withdrawn
endorsement
– with
latest
date
by
which
the
national standards conflicting
the
EN
have
to
– with
latestthe

date
which
thewithdrawn
national standards conflicting
ENby
have
to be
– with
latestthe
date
which
thewithdrawn
national standards conflicting
ENby
have
to be
Annex ZA has been added by CENELEC.
with
the
EN
have
to
be
withdrawn
Annex ZA has been added by CENELEC.

(dop)
(dop)
(dop)
(dop)

(dow)
(dow)
(dow)
(dow)

2007-07-01
2007-07-01
2007-07-01
2007-07-01
2009-07-01
2009-07-01
2009-07-01
2009-07-01

Annex ZA has been added by CENELEC.
Annex ZA has been added by CENELEC.

__________
__________
__________
__________notice
Endorsement

Endorsement notice
Endorsement notice
The text of the International Standard IEC 61937-6:2006 was approved by CENELEC as a European
Endorsement
The
text
of

the
International
Standard
IEC 61937-6:2006notice
was approved by CENELEC as a European
Standard without any modification.

The text of
the International
Standard IEC 61937-6:2006 was approved by CENELEC as a European
Standard
without
any modification.
The61937-6:2006/A1:2014
text of
the International
Standard IEC 61937-6:2006
was approved by CENELEC as a European
EN
-2Standard
without
any modification.
__________
Standard without any modification.
__________
__________
ForewordForeword
to amendment A1
__________
The text of document 100/2052/CDV, future IEC 61937-6:2006/A1, prepared by Technical Area 4

"Digital system interfaces and protocols" of IEC/TC 100 "Audio, video and multimedia systems and
equipment" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN 61937-6:2006/A1:2014.
The following dates are fixed:
•

latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement

(dop)

2014-12-05

•

latest date by which the national
standards conflicting with the
document have to be withdrawn

(dow)

2017-03-05

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice

The text of the International Standard IEC 61937-6:2006/A1:2014 was approved by CENELEC as a
European Standard without any modification.


BS EN 61937-6:2006+A1:2014
EN 61937-6:2006+A1:2014

-3– 21 –
– 21 –

Annex ZA
Annex ZA
(normative)
(normative)

EN 61937-6:2006
EN 61937-6:2006

Normative references to international publications
Normative
to international
publications
with their references
corresponding
European publications
with their corresponding European publications
The following referenced documents are indispensable
The
following
referenced

documents
are indispensable
references,
only
the edition
cited applies.
For undated
references,
only
the
edition
cited
applies.
For undated
document (including any amendments) applies.
document (including any amendments) applies.

for the application of this document. For dated
for the application
of this
document.
For dated
references,
the latest
edition
of the referenced
references, the latest edition of the referenced

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
-3EN 61937-6:2006/A1:2014
applies.

-3EN 61937-6:2006/A1:2014
Year
Title
EN/HD
Year
Annex ZA
Year
Title
EN/HD
Year
Series Digital audio interface
EN 60958
Series
(normative)
Annex ZA
Series Digital audio interface
EN 60958
Series
(normative)
Series Digital audio - Interface
for non-linear PCM
EN 61937
Series
Normative
references
to international

publications
Series Digital
audio
- Interface
forapplying
non-linear PCM
EN 61937
Series
encoded
audio
bitstreams
encoded
audio bitstreams
applying publications
with their
corresponding
European
IECreferences
60958
Normative
to international
publications
IEC 60958
1)
2)
with
their
corresponding
European
publications

IEC 61937-1
Digital audio - Interface for non-linear PCM
EN 61937-1
-1)
20032)
IEC 61937-1
Digital
audio
Interface
for
non-linear
PCM
EN
61937-1
2003
encoded
audio bitstreams
Replacement and- addition
in Annex
ZA of ENapplying
61937-6:2006:
encoded
audio bitstreams applying
IEC 60958
IEC 60958
Replacement and addition
in
Annex ZA of EN 61937-6:2006:
Part
1: General

Part 1: General
1)
Publication
Year
Title
EN/HD
Year 2)
IEC 61937-2
-1)
Digital audio - Interface for non-linear PCM
EN 61937-2
20032)
IEC 61937-2
Digital
audio
- Interface
forapplying
non-linear PCM
EN 61937-2
2003
encoded
audio
bitstreams
Publication
Year
Title
EN/HD
Year
encoded
audio bitstreams applying

IEC
60958
Replace, in the list of normative references, the following standards by undated references:
IEC 60958
Part
2: Burst-info
Part 2:references,
Burst-info
ISO/IEC
13818-7
Information
technology
Generic coding
of - by undated references:
Replace,
in the list- of normative
the- following
standards
pictures
and associated
audio
ISO/IEC 13818-7 2004 moving
Information
technology
- Generic
coding of
ISO/IEC 13818-7 2004
Information
- -Generic
coding

- Information
technology
Genericaudio
codingofof - information
-technology
moving pictures
and associated
moving
pictures
associated
audio
moving
picturesand
and
associated
audio
Part
7: Advanced
Audio
Coding (AAC)
information
information
information
Part 7: Advanced
Audio
Coding of
(AAC)
ISO/IEC 14496-3 Information
technology
- Coding

Coding
audioPart
Audio
Part7:7:Advanced
Advanced
Audio
Coding(AAC)
(AAC)
visual
objects
ISO/IEC 14496-3
14496-3 -2001 Information
Informationtechnology
technology- -Coding
Codingofofaudioaudio- - ISO/IEC
- 3: Audio
ISO/IEC
14496-3
2001
Information
technology - Coding of audio+ A1
2003 Part
visual
objects
visual objects + A1
2003
visual
objects
Part3:3:Audio
Audio

Part
Add, at the end of the existing
of normative references the following new publication:
Part list
3: Audio

Publication
Publication
IEC 60958
IEC 60958
IEC 61937
IEC 61937

ISO/IEC
Information
technology references
- MPEG audio
Add, at 23003-1
the end of -the existing
list of normative
the following
new publication:
technologies ISO/IEC 23003-1 Information
technology
Part 1: MPEG
Surround- MPEG audio
technologies Part 1: MPEG Surround

1)
1)

2)
2)

Undated reference.
Undated reference.
Valid edition at date of issue.
Valid edition at date of issue.


BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

–3–
-4–3–

CONTENTS

EN 61937-6:2006
EN 61937-6:2006

FOREWORD...........................................................................................................................4
CONTENTS
FOREWORD...........................................................................................................................4
1 Scope ...............................................................................................................................6
2
1
3
2
3
4

4
5
5

Normative references .......................................................................................................6
Scope ...............................................................................................................................6
Terms, definitions, abbreviations and presentation convention ..........................................6
Normative references .......................................................................................................6
3.1 Terms and definitions ...............................................................................................6
Terms, definitions, abbreviations and presentation convention ..........................................6
3.2 Abbreviations ..........................................................................................................7
3.1 Terms and definitions ...............................................................................................6
3.3 Presentation convention .......................................................................................... 7
3.2 Abbreviations ..........................................................................................................7
Mapping of the audio bitstream on to IEC 61937 ..............................................................7
3.3 Presentation convention .......................................................................................... 7
4.1 MPEG-2 AAC burst-info...........................................................................................7
Mapping of the audio bitstream on to IEC 61937 ..............................................................7
4.2 MPEG-4 AAC burst-info...........................................................................................8
4.1 MPEG-2 AAC burst-info...........................................................................................7
Format of MPEG-2 AAC and MPEG-4 AAC data-bursts .................................................... 8
4.2 MPEG-4 AAC burst-info...........................................................................................8
5.1 Pause data-burst .....................................................................................................9
Format of MPEG-2 AAC and MPEG-4 AAC data-bursts .................................................... 8
5.2 Audio data-bursts ....................................................................................................9
5.1 Pause data-burst .....................................................................................................9
5.2 Audio data-bursts ....................................................................................................9

Figure 1 – MPEG-2 AAC data-burst ........................................................................................9
Figure

Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure

2 – Latency of MPEG-2 AAC decoding ....................................................................... 10
1 – MPEG-2 AAC data-burst ........................................................................................9
3 – MPEG-2 AAC half-rate low sampling frequency data-burst ................................... 11
2 – Latency of MPEG-2 AAC decoding ....................................................................... 10

4 – Latency of MPEG-2 AAC half-rate low sampling frequency decoding.................... 12
3 – MPEG-2 AAC half-rate low sampling frequency data-burst ................................... 11
5 – MPEG-2 AAC quarter-rate low sampling frequency data-burst.............................. 13
4 – Latency of MPEG-2 AAC half-rate low sampling frequency decoding.................... 12
6 – Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding .............. 14
5 – MPEG-2 AAC quarter-rate low sampling frequency data-burst.............................. 13
7 – MPEG-4 AAC data-burst ...................................................................................... 15
6 – Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding .............. 14
7 – Latency of MPEG-4 AAC decoding ....................................................................... 16
7 – MPEG-4 AAC data-burst ...................................................................................... 15
8 – MPEG-4 AAC half-rate low sampling frequency data-burst ................................... 16
7 – Latency of MPEG-4 AAC decoding ....................................................................... 16
9 – Latency of MPEG-4 AAC half-rate low sampling frequency decoding.................... 18
17
8 – MPEG-4 AAC half-rate low sampling frequency data-burst ................................... 16
10 – MPEG-4 AAC quarter-rate low sampling frequency data-burst ............................ 18
9 – Latency of MPEG-4 AAC half-rate low sampling frequency decoding.................... 17
11 – Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding ............ 20
19
10 – MPEG-4 AAC quarter-rate low sampling frequency data-burst ............................ 18
12 – MPEG-4 AAC double-rate high sampling frequency data-burst ........................... 20
11 – Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding ............ 19
13 – Latency of MPEG-4 AAC double-rate high sampling frequency decoding............ 21
12 – MPEG-4 AAC double-rate high sampling frequency data-burst ........................... 20

Figure 13 – Latency of MPEG-4 AAC double-rate high sampling frequency decoding............ 21
Table 1 – Fields of burst-info (data-type=7) ............................................................................7
Table 2 – Fields of burst-info (data-type=19)...........................................................................8
Table 1 – Fields of burst-info (data-type=7) ............................................................................7
Table 3 – Fields of burst-info (data-type=20)...........................................................................8

Table 2 – Fields of burst-info (data-type=19)...........................................................................8
Table 4 – Repetition period of pause data-bursts .................................................................... 9
Table 3 – Fields of burst-info (data-type=20)...........................................................................8
Table 5 – Repetition period of pause data-bursts .................................................................... 9
Table 4 – Repetition period of pause data-bursts .................................................................... 9
Table 6 – Data-type-dependent information for data-type MPEG-2 AAC................................ 10
Table 5 – Repetition period of pause data-bursts .................................................................... 9
Table 7 – Data-type-dependent information for data-type MPEG-2 AAC
Table 6 – Data-type-dependent information for data-type MPEG-2 AAC................................ 10
half-rate low sampling frequency........................................................................................... 11
Table 7 – Data-type-dependent information for data-type MPEG-2 AAC
Table 8 – Data-type-dependent information for data-type MPEG-2 AAC
half-rate low sampling frequency........................................................................................... 11
quarter-rate low sampling frequency ..................................................................................... 13
Table 8 – Data-type-dependent information for data-type MPEG-2 AAC
quarter-rate low sampling frequency ..................................................................................... 13


EN 61937-6:2006

-5–4–

BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

Table 9 – Data-type-dependent information for data-type MPEG-4 AAC................................ 15
Table 10 – Data-type-dependent information for data-type MPEG-4 AAC
half-rate low sampling frequency........................................................................................... 17
Table 11 – Data-type-dependent information for data-type MPEG-4 AAC
quarter-rate low sampling frequency ..................................................................................... 18

19
Table 12 – Data-type-dependent information for data-type MPEG-4 AAC
21
double-rate high sampling frequency .................................................................................... 20


CDV

Report on voting

61937-6:2006
– 5of
– this100/2117/RVC
Full information on the voting100/2052/CDV
for the approval
amendment can beEN
found
in the report
on
voting
indicated
in
the
above
table.
EN
61937-6:2006
–
5
–

BS EN 61937-6:2006+A1:2014
Full
information on the voting for the
approval- AUDIO
of
can be found in the report
DIGITAL
–
IEC 61937-6:2006+A1:2014
6 - this amendment
EN 61937-6:2006
– of
5AUDIO
–this amendment
The
committee
has
decided
that table.
the
contents
and the base
publication will
on voting
indicated
in
the above
INTERFACE
FOR
NON-LINEAR

DIGITAL
–PCM ENCODED
remain unchanged until the stability date indicated on the IEC web site under
AUDIO BITSTREAMS
APPLYING
IECENCODED
60958 –
INTERFACE
FOR NON-LINEAR
PCM
""
in the
related of
toAUDIO
the amendment
specific
publication.
At publication
this date, will
the
The
committee has AUDIO
decided
thatdata
the DIGITAL
contents
this
and
the –
base

– IEC
BITSTREAMS
APPLYING
60958
publication
will
be
remain unchanged until the stability date indicated on the IEC web site under

INTERFACE
FOR NON-LINEAR
PCM
ENCODED
Part
6: Non-linear
PCM bitstreams
according
to

""
in the
data related APPLYING
to the specific
publication.
AUDIO
BITSTREAMS
IEC
60958 –toAt this date, the
•publication
reconfirmed,

the6:MPEG-2
AACPCM
and bitstreams
MPEG-4 AAC
formats
Non-linear
according
will bePart
the MPEG-2 AAC and MPEG-4 AAC formats
• withdrawn,
• reconfirmed, Part 6: Non-linear PCM bitstreams according to
• replaced by a revised edition, or
the MPEG-2 AAC and MPEG-4 AAC formats
• withdrawn,
• amended.
•1 replaced
Scope by a revised edition, or
_____________
•1 amended.
Scope
This part of IEC 61937 specifies the method for IEC 60958 to convey non-linear PCM
_____________
bitstreams
encoded
in accordance
with
the MPEG-2
AAC
(Advanced
Audio

Coding) PCM
and
1
ThisScope
part of
IEC 61937
specifies the
method
for IEC
60958
to convey
non-linear
MPEG-4
AAC
formats.
bitstreams encoded in accordance
with
the
MPEG-2
AAC
(Advanced
Audio
Coding)
and
INTRODUCTION to Amendment 1
MPEG-4
This
partAAC
of formats.
IEC 61937 specifies the method for IEC 60958 to convey non-linear PCM

bitstreams encoded in accordance with the MPEG-2 AAC (Advanced Audio Coding) and
2 Normative
references
The
revision
IEC
61937-6:2006
has become to
necessary
to define
INTRODUCTION
Amendment
1 new additional data-typeMPEG-4
AACofformats.
dependent
information.
This Amendment 1 contains the following significant technical
2 Normative
references
changes
withofrespect
to the
base has
publication.
The
revised
apply
the
small
parts of

The revision
following
referenced
documents
are
indispensable
fortoitems
the
application
of this
document.
The
IEC 61937-6:2006
become
necessary
define
new to
additional
data-typeIEC
61937-6.
2
Normative
references
For
dated
references,
only
the
edition
cited

applies.
For
undated
references,
the
latest
edition
dependent
information.
Amendment
1 contains for
thethefollowing
significant
technical
The following
referenced This
documents
are indispensable
application
of this document.
of
the
referenced
document
(including
any
amendments)
applies.
changes
respect only

to the
publication.
The revised
itemsreferences,
apply to the
of
For datedwith
references,
thebase
edition
cited applies.
For undated
thesmall
latestparts
edition
– LC profile with MPEG Surround, LC profile with SBR and MPEG Surround in MPEG-2 AAC
IEC
61937-6.
of the
referenced
document
(including are
any indispensable
amendments) for
applies.
The
following
referenced
documents
the

application
of
this
document.
are defined data-type-dependent information field in Pc.
IEC
60958references,
(all parts), Digital
audio
interface
For dated
only the
edition
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HE-AAC
HE-AAC
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IEC
60958 (all
parts),
Digital
audio
interface
are definedwith
data-type-dependent
information field
in Pc. data-type-dependent information
combined
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are defined
IEC 61937 (all parts), Digital audio – Interface for non-linear PCM encoded audio bitstreams
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2
Normative
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61937-1,
– Interface
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applying
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Digital
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IEC
60958
– Part
1: General
applying
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60958
IEC
61937-1,

Digital
audio – Interface for non-linear PCM encoded audio bitstreams applying
Replace,
list
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2
references
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60958in–the
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1:ofGeneral
IEC 61937-2,
61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
ISO/IEC
13818-7,
Information
technology
Generic
coding
of moving
pictures
and
associated
Replace,
in–the
list2:
ofBurst-info
normative
references,
the following

by
undated
references
IEC
60958
Part
1:
General
IEC 61937-2,
Digital
audio
– Interface
for –non-linear
PCMstandards
encoded
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bitstreams
applying
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information
–
Part
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Advanced
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ISO/IEC
13818-7,

Information
technology
Generic
coding
ofcoding
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and
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13818-7:2004,
Information
technology
– Generic
ofpictures
moving
pictures
and
IEC 61937-2,
Digital
audio
– Interface
for –non-linear
PCM encoded
audio
bitstreams
applying
ISO/IEC
14496-3,
– Coding
of
audio-visual

objects
– Part pictures
3: Audio and
audio
information
–Information
Part
7:
Advanced
Audio
Coding
(AAC)
associated
–technology
Part 7:
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Coding
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IEC
60958
–audio
Part information
2:
Burst-info
ISO/IEC
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Information
technology
–Audio
Generic

coding
of moving
associated audio information – Part 7: Advanced Audio Coding (AAC)
Add,
at the
end of Information
the existing
list of normative
references
the
following
publication:
14496-3,
technology
– Coding
audio-visual
objects
– objects
Part
3: Audio
14496-3:2001,
Information
technology
–– of
Coding
ofcoding
audio-visual
– Partand
3:
of new

moving
pictures
ISO/IEC
13818-7:2004,
technology
Generic
Audio
associated
audio
information
–
Part
7:
Advanced
Audio
Coding
(AAC)
ISO/IEC 14496-3:2001, Information technology – Coding of audio-visual objects – Part 3:
Amendment
1 (2003)
Audio
ISO/IEC
23003-1,
Information
technology
– references
MPEG audio
technologies
– Part 1: MPEG
Add,

at the
end
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existing list
of normative
the following
new publication:
 Surround
 1 (2003)
Amendment
ISO/IEC 14496-3:2001,
Information technology – Coding of audio-visual objects – Part 3:
Audio
ISO/IEC
23003-1,
Information
technology and
– MPEG
audio technologies
3 Terms,
definitions,
abbreviations
presentation
convention– Part 1: MPEG
Amendment 1 (2003)
Surround

3

Terms, definitions, abbreviations and presentation convention

For the purposes of this document, the following terms, definitions, abbreviations and
3
definitions,
abbreviations
presentation
convention
presentation
convention
apply.
For Terms,
the purposes
of this
document, theand
following
terms, definitions,
abbreviations and
presentation convention apply.
3.1
Terms
and definitions
For the
purposes
of this document, the following terms, definitions, abbreviations and
presentation
convention
apply.
3.1
Terms and definitions
3.1.1

subdata-type
3.1.1 Terms and definitions
3.1
reference
to the type of payload of the data-burst defined for use with the specified data-type
subdata-type
reference
to the type of payload of the data-burst defined for use with the specified data-type
3.1.1
3.1.2
subdata-type
LC
profileto the type of payload of the data-burst defined for use with the specified data-type
reference
3.1.2

3.1.2
low
complexity
LC
profile
MPEG-2
AAC LCprofile
profileidentified in ISO/IEC 13818-7
low
complexity
profile
identified
ISO/IECin13818-7
MPEG-2

AAC low complexity
profileinidentified
ISO/IEC 13818-7
3.1.2
LC profile
low complexity profile identified in ISO/IEC 13818-7
3.1.3
MPEG-2 AAC LC profile with SBR
MPEG-2 AAC low complexity profile with spectral band replication identified in ISO/IEC 13818-7


EN 61937-6:2006

–6–

3.1.3
BS EN 61937-6:2006+A1:2014
LC profile with SBR
IEC 61937-6:2006+A1:2014
-7low complexity profile with spectral band replication identified in ISO/IEC 13818-7
3.1.4
latency
delay time of an external audio decoder to decode a MPEG-2 AAC or MPEG-4 AAC data-burst
defined as the sum of two values of the receiving delay time and the decoding delay time
EN 61937-6:2006
–6–

3.1.5
3.1.5
MPEG-4

AAC profile
AAC
3.1.3 profile
EN
61937-6:2006
–6–
MPEG-4
AAC
profile
identified
in ISO/IEC
14496-3
AACprofile
profile
identified
in ISO/IEC
14496-3
LC
with
SBR
low complexity profile with spectral band replication identified in ISO/IEC 13818-7
3.1.6
3.1.3
3.1.6
MPEG-4
HE-AAC
profile
LC
profile
with SBR

HE-AAC
profile
3.1.4
MPEG-4
HE-AAC
profile
identified
in ISO/IEC
14496-3 identified in ISO/IEC 13818-7
low
complexity
profile
with
band
replication
HE-AAC profile identified
inspectral
ISO/IEC
14496-3
latency
delay time of an external audio decoder to decode a MPEG-2 AAC or MPEG-4 AAC data-burst
3.1.7
3.1.4
defined
as the sum of two values of the receiving delay time and the decoding delay time
3.2
Abbreviations
MPEG-4
latency HE-AAC V2 profile
MPEG-4

HE-AAC
V2 profileaudio
identified
in ISO/IEC
14496-3
delay
an external
decoder
to decode
a MPEG-2 AAC or MPEG-4 AAC data-burst
AAC time ofAdvanced
Audio Coding
3.1.5
defined
as
the
sum
of
two
values
of
the
receiving
delay
time and the decoding delay time
AAC
ADTSprofileAudio Data Transport Stream
3.1.8
AAC profile identified in ISO/IEC 14496-3
MPEG

SBR Surround
Spectral Band Replication
3.1.5
technology
used for coding of multichannel signals based on a down mixed signal of the original
AAC
profile
HE-AAC
High
Efficiency
AAC spatial parameters
3.1.6
multichannel
signal,
andinassociated
AAC
profile
identified
ISO/IEC 14496-3
HE-AAC
profile
Note
1 to entry:
MPEG
Surround
defined in14496-3
ISO/IEC 23003-1.
HE-AAC
profile
identified

in inISO/IEC
3.3
Presentation
convention
3.1.6
Value “01” in binary format
01 2
HE-AAC
profile
3.2
Abbreviations
HE-AAC profile identified in ISO/IEC 14496-3
AAC
Advanced Audio Coding
4 Mapping
of the audio bitstream on to IEC 61937
3.2
Abbreviations
ADTS
Audio Data Transport Stream
SBR
Spectral
Band
Replication
AAC
Audio
Coding
The coding Advanced
of the bitstream
and

data-burst is in accordance with IEC 61937.
HE-AAC
High Efficiency
AAC Stream

HE-AAC MPEG-4
HighTransport
Efficiency
AAC
ADTS
Audio
Data
4.1
MPEG-2
AACHigh
burst-info
HE-AAC
V2 MPEG-4
Efficiency
AAC Version 2
SBR
Spectral
Band
Replication
3.3
Presentation
convention
MPEG
Moving
Picture

Experts
Group is given in Table 1.
HE-AAC
High
Efficiency
AAC
MPEG-2
AAC
burst-info
(data-type=7)
Value “01” in binary format
01 2
3.3

Presentation convention
Table 1 – Fields of burst-info (data-type=7)
Value “01” in binary format

01 2

4Bits Mapping
of the audio
bitstream on to IEC 61937
of Pc
Value
Contents

Reference
point R

Repetition period
of data-burst in
IEC 60958 frames

The coding of the bitstream and data-burst is in accordance with IEC 61937.

4
bitstream on to IEC 61937
0-4 Mapping of the audio
Data-type

7
MPEG-2 AAC ADTS
Bit 0 of Pa
1 024
4.1
MPEG-2 AAC
burst-info
The coding of the bitstream and data-burst is in accordance with IEC 61937.
5,6
00 2
Reserved
MPEG-2 AAC burst-info (data-type=7) is given in Table 1.
7-15
In accordance with IEC 61937-1 and
4.1
MPEG-2 AAC burst-info
IEC 61937-2
Table 1 – Fields of burst-info (data-type=7)
MPEG-2 AAC burst-info (data-type=7) is given in Table 1.

MPEG-2
burst-info Contents
(data-type=19) is given in Table 2. Reference
Bits of Pc AAC
Value
point R
Table 1 – Fields of burst-info (data-type=7)

Repetition period
of data-burst in
IEC 60958 frames

Bits of Pc
0-4

Reference
point R
Bit 0 of Pa

Repetition period
of data-burst in
1 024
IEC
60958 frames

Bit 0 of Pa

1 024

Value
7

5,6
0-4
7-15
5,6
7-15

00 2
7
00 2

Contents
Data-type
MPEG-2 AAC ADTS
Reserved
Data-type
In accordance
with IEC 61937-1 and
MPEG-2
AAC ADTS
IEC 61937-2
Reserved
In accordance with IEC 61937-1 and

MPEG-2 AAC burst-info IEC
(data-type=19)
is given in Table 2.
61937-2

MPEG-2 AAC burst-info (data-type=19) is given in Table 2.


BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

-8–7–

EN 61937-6:2006

Table 2 – Fields of burst-info (data-type=19)
Bits of Pc

Value

0-4

Reference
point R

Repetition period
of data-burst in
IEC 60958 frames

Data-type
19

5,6

MPEG-2 AAC ADTS low sampling

frequency

Depends on
subdata-type

Subdata-type
00 2

Subdata-type for MPEG-2 AAC ADTS halfrate low sampling frequency

Bit 0 of Pa

2 048

01 2

Subdata-type for MPEG-2 AAC ADTS
quarter-rate low sampling frequency

Bit 0 of Pa

4 096

10 2, 11 2
7-15

4.2

Contents

Reserved
In accordance with IEC 61937-1 and
IEC 61937-2

MPEG-4 AAC burst-info

MPEG-4 AAC burst-info (data-type=20) is given in Table 3.
Table 3 – Fields of burst-info (data-type=20)
Bits of Pc

Value

0-4

5,6

5

Reference
point R

Repetition period
of data-burst in
IEC 60958 frames

Data-type
20

7-15

Contents

MPEG-4 AAC

Depends on
subdata-type

Subdata-type
00 2

Subdata-type for MPEG4 AAC

Bit 0 of Pa

1024

01 2

Subdata-type for MPEG4 AAC half-rate
low sampling frequency

Bit 0 of Pa

2 048

10 2

Subdata-type for MPEG4 AAC quarter-rate
low sampling frequency

Bit 0 of Pa

4 096

11 2

Subdata-type for MPEG4 AAC double-rate
high sampling frequency

Bit 0 of Pa

512

In accordance with IEC 61937-1 and
IEC 61937-2

Format of MPEG-2 AAC and MPEG-4 AAC data-bursts

This clause specifies the audio data-bursts MPEG-2 AAC and MPEG-4 AAC. 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, should be used by the
transmitter to schedule data-bursts as necessary to establish synchronization between the
picture and the decoded audio.


EN 61937-6:2006
5.1
5.1.1

BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

-9–8–

Pause data-burst
The data MPEG-2 AAC

The pause data-burst for MPEG-2 AAC is given in Table 4.
Table 4 – Repetition period of pause data-bursts
Data-type of audio data-burst

Repetition period of pause data-burst
Mandatory

Recommended

MPEG-2 AAC

-

32 IEC 60958 frames

MPEG-2 AAC and half-rate low sampling frequency

-

64 IEC 60958 frames

MPEG-2 AAC and quarter-rate low sampling frequency

-

128 IEC 60958 frames

5.1.2

The data MPEG-4 AAC

The pause data-burst for MPEG-4 AAC is given in Table 5.
Table 5 – Repetition period of pause data-bursts
Data-type of audio data-burst

Repetition period of pause data-burst
Mandatory

Recommended

MPEG-4 AAC

-

32 IEC 60958 frames

MPEG-4 AAC and half-rate low sampling frequency

-

64 IEC 60958 frames

MPEG-4 AAC and quarter-rate low sampling frequency

-

128 IEC 60958 frames

MPEG-4 AAC double-rate high sampling frequency

-

16 IEC 60958 frames

5.2
5.2.1

Audio data-bursts
The data MPEG-2 AAC

The stream of the data-bursts for MPEG-2 AAC consists of sequences of MPEG-2 AAC ADTS
frames. The data-type of an MPEG-2 AAC data-burst is 7. The data-burst is headed with a
burst-preamble, followed by the burst-payload, and stuffed with stuffing bits. The burstpayload of each data-burst of MPEG-2 AAC data shall contain one complete MPEG-2 AAC
ADTS frame and represents 1 024 samples for each encoded channel. The length of the
MPEG-2 AAC data-burst depends on the encoded bit rate (which determines the MPEG2 AAC ADTS frame length). The reference to the specification for the MPEG-2 AAC bitstream,
representing 1 024 samples of encoded audio per frame is found in ISO/IEC 13818-7.
Pa Pb Pc Pd

MPEG-2 AAC
burst_payload

Pa Pb Pc Pd

MPEG-2 AAC
burst_payload

Bit 0 of Pa

Bit 0 of Pa
AAC frame

Stuffing

Regular rate of the MPEG-2 AAC frames
Repetition period of the burst

Figure 1 – MPEG-2 AAC data-burst
The data-type-dependent information for MPEG-2 AAC is given in Table 6.

AAC frame


BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

- 10 –9–

EN 61937-6:2006

Table 6 – Data-type-dependent information for data-type MPEG-2 AAC
Bits of Pc

Value

Contents

00

No indication

01

LC profile

02, 03

Reserved for future profile

04-31

Reserved

LSB..MSB
8-12

The reference point of an MPEG-2 AAC data-burst is bit 0 of Pa and occurs exactly once
every 1 024 sampling periods. The data-burst containing MPEG-2 AAC frames shall occur at a
regular rate, with the reference point of each MPEG-2 AAC data-burst beginning 1 024
IEC 60958 frames after the reference point of the preceding MPEG-2 AAC data-burst (of the
same bitstream number).
It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-2 AAC bitstream as described in IEC 61937, and that pause data-bursts be transmitted with a repetition
period of 32 IEC 60958 frames, except when other repetition periods are necessary to fill the

precise stream-gap length (which may not be a multiple of 32 IEC 60958 frames), or to meet
the requirement on burst spacing (see IEC 61937).
When a stream gap in an MPEG-2 AAC stream is filled by a sequence of pause data-bursts,
the Pa of the first pause data-burst shall be located 1 024 sampling periods following the Pa
of the previous MPEG-2 AAC frame. It is recommended that the sequence(s) of pause databursts which fill the stream gap should continue from this point up to (as close as possible to,
considering the 32 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG2 AAC data-burst which follows the stream gap. The gap-length parameter contained in the
pause data-burst is intended to be interpreted by the MPEG-2 AAC decoder as an indication
of the number of decoded PCM samples which are missing (due to the resulting audio gap).
5.2.2

Latency of MPEG-2 AAC decoding

The latency of an external audio decoder to decode MPEG-2 AAC is defined as the sum of the
receiving delay time and the decoding delay time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-2 AAC
burst-payload
MPEG-2 AAC frame

MPEG-2 AAC
burst-payload

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-2 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay

Latency of MPEG-2 AAC decoder
Figure 2 – Latency of MPEG-2 AAC decoding
EXAMPLE The receiving delay time to receive a whole data-burst with maximum length is
calculated as follows. The length of preamble is 64 bits. The maximum length of whole databurst payload is 8 192 bit in the Japanese satellite DTV specified maximum bit rate of
EN
61937-6:2006
– 10
384 kbit/s.
In this case, the maximum length
of –
data-bursts is 8 256 bit. The receiving delay
time is calculated as 5,375 ms in the case of the 48 kHz sampling frequency. The decoding
delay time is calculated as 21,333 ms. It is of equal value to the decoding time for one MPEG2 AAC frame data. Hence, the latency of MPEG-2 AAC decoding is approximately 26,708 ms.
The absolute maximum length of the data-burst is calculated as follows. In order to make a
burst, a minimum stuffing consists of 4 stuffing words (Pz of 16 bits) per burst. The repetition


EN 61937-6:2006

– 10 –

BS EN 61937-6:2006+A1:2014

IEC 61937-6:2006+A1:2014
- 11 - value to the decoding
delay time is calculated as 21,333 ms. It is of equal
time for one MPEGEN
61937-6:2006
–
10
–
2 AAC frame data. Hence, the latency of MPEG-2 AAC decoding is approximately 26,708 ms.
delayabsolute
time is calculated
21,333
ms. data-burst
It is of equal
value to theasdecoding
for one
MPEGThe
maximum as
length
of the
is calculated
follows. time
In order
to make
a
2
AAC
frame
data.
Hence,

the
latency
of
MPEG-2
AAC
decoding
is
approximately
26,708
ms.
burst, a minimum stuffing consists of 4 stuffing words (Pz of 16 bits) per burst. The repetition
period of data-burst in IEC 60958 frames is 1 024. Therefore, the maximum length of data-burst
The absolute
calculated
follows.
In order
to make
a
leads
to 1 024maximum
sample * length
2 ch * of16the
bitsdata-burst
– 4 word is
* 16
bits = 32as704
bits. The
receiving
delay
burst, is

a minimum
stuffing
words of
(Pz the
of 1648
bits)
burst. Thefrequency
repetition
time
calculated
as consists
21,29 msof 4instuffing
the case
kHzpersampling
period
of data-burst
IEC 60958
frames
is 1 024.
Therefore,
maximum
data-burst
(32
704/1
536 000 =in 0,021
29). The
decoding
delay
time isthe
21,333

ms aslength
above.of Hence,
the
leads toof1 MPEG-2
024 sample
2 ch * 16isbits
– 4 wordof* 42,62
16 bitsms.
= 32 704 bits. The receiving delay
latency
AAC* decoding
a maximum
time is calculated as 21,29 ms in the case of the 48 kHz sampling frequency
(32
536 000 = (for
0,021
29). The
decoding
delay
time is 21,333
ms ofaslatency
above.isHence,
the
For 704/1
synchronization
example,
with
video), the
recommended
value

42,62 ms.
latency
of
MPEG-2
AAC
decoding
is
a
maximum
of
42,62
ms.
A shorter latency is acceptable when synchronization is not required.
For synchronization
(for example,
with video),
recommended
value of latency is 42,62 ms.
5.2.3
The data MPEG-2
AAC half-rate
low the
sampling
frequency
A shorter latency is acceptable when synchronization is not required.
The stream of the data-bursts for MPEG-2 AAC half-rate low sampling frequency consists of
sequences
MPEG-2
AACAAC
lowhalf-rate

samplinglow
frequency
frames. The data-type of an
5.2.3
Theofdata
MPEG-2
samplingADTS
frequency
MPEG-2 AAC low sampling frequency data-burst is 19; and the subdata type of an MPEGThe
stream
of the
for MPEG-2
lowissampling
frequency
consists of
2
AAC
half-rate
lowdata-bursts
sampling frequency
is 0.AAC
Thehalf-rate
data-burst
headed with
a burst-preamble,
sequences
AAC low
frequency
ADTSThe
frames.

The data-type
an
followed
by of
theMPEG-2
burst-payload,
andsampling
stuffed with
stuffing bits.
burst-payload
of each of
dataMPEG-2
AACMPEG-2
low sampling
frequency
is 19; and data
the subdata
type one
of ancomplete
MPEGburst
of the
AAC half-rate
lowdata-burst
sampling frequency
shall contain
2 AAC half-rate
low sampling
frequency
is 0. TheADTS
data-burst

headed
with a burst-preamble,
MPEG-2
AAC half-rate
low sampling
frequency
frame,is and
represents
2 048 samples
followed
the burst-payload,
stuffed
with
stuffingAAC
bits. half-rate
The burst-payload
of each
datafor
each by
encoded
channel. Theand
length
of the
MPEG-2
low sampling
frequency
burst of thedepends
MPEG-2onAAC
lowrate
sampling

data
contain
complete
data-burst
the half-rate
encoded bit
(whichfrequency
determines
the shall
MPEG-2
AACone
half-rate
low
MPEG-2
half-rate
low frame
sampling
frequency
ADTS frame,
and
represents for
2 048
sampling AAC
frequency
ADTS
length).
The reference
to the
specification
thesamples

MPEGforAAC
eachhalf-rate
encodedlow
channel.
Thefrequency
length of bitstream,
the MPEG-2
AAC half-rate
lowsamples
samplingoffrequency
2
sampling
representing
2 048
encoded
data-burst
depends
encoded
bit rate
(which determines the MPEG-2 AAC half-rate low
audio
per frame
mayon
bethe
found
in ISO/IEC
13818-7.
sampling frequency ADTS frame length). The reference to the specification for the MPEG2 AAC half-rate lowMPEG-2
sampling
frequency

samples
of sample
encoded
AAC low
rate
AAC low
sample rate bitstream, representing 2 048MPEG-2
Pa per
Pb frame
Pc Pd
Pa Pb Pc Pd
audio
may be burst_payload
found in ISO/IEC 13818-7.
burst_payload
Bit 0 of Pa
Bit 0 of Pa
MPEG-2 AAC low sample rate
Pa Pb Pc
Pa Pb Pc Pd
burst_payload
AAC frame
Stuffing
Bit 0 of Pa
Bit 0 of Pa
Regular rate of the MPEG-2 AAC frames
AAC frame
Stuffing
Repetition period of the burst
Regular rate of the MPEG-2 AAC frames

Pd

MPEG-2 AAC low sample rate

burst_payload
AAC frame
AAC frame

Figure
3 – MPEG-2
half-rate low sampling frequency data-burst
Repetition
period ofAAC
the burst
The data-type-dependent information for the –MPEG-2
AAC half-rate
low sampling
is
4–
61937-6
Amend. 1 frequency
© IEC:2014
Figure
given in Table
7. 3 – MPEG-2 AAC half-rate low sampling frequency data-burst
Data-type-dependent
information
for data-type
 Table 7 –information

The data-type-dependent
for the
MPEG-2
AAC
low
sampling
frequency is
Table 7 – Data-type-dependent
information
for half-rate
data-type
MPEG-2
AAC
MPEG-2
AAC
half-rate
low
sampling
frequency
given in Table 7.
half-rate low sampling frequency
Bits of Pc
7
Bits
of Pc Table
Value
LSB..MSB

Value

Contents

– Data-type-dependent information
for data-type MPEG-2 AAC
Contents
half-rate low sampling frequency

LSB..MSB
8-12

00

8-12
Bits of Pc

0
01
Value

LC profile

No
indication
Contents

1

Reserved

LC profile

LSB..MSB
8-12

02

No indication

2,
0 3 03

Reserved
for future profile
LC profile with MPEG
Surround
No indication

4
1

LC
profile with SBR
LC profile with SBR
LC profile

04

2, 3 05,06
5-31
07

Reserved

Reserved for future profile

LC profile with SBR and MPEG Surround

4
LC profile with SBR
The reference
point of an MPEG-2 AAC half-rate
low sampling frequency data-burst is bit 0 of
08-31
Reserved
Pa and occurs
exactly
once
every
2
048
sampling
5-31
Reserved periods. The data-burst containing the 


The reference point of an MPEG-2 AAC half-rate low sampling frequency data-burst is bit 0 of
Pa
andThe
occurs
2 048 sampling

periods.
The data-burst containing the
5.2.5
dataexactly
MPEG-2once
AACevery
quarter-rate
low sampling
frequency
Replace the entire existing Table 8 by the following new Table 8:
Table 8 – Data-type-dependent information for data-type


BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

- 12 – 11 –

EN 61937-6:2006

MPEG-2 AAC half-rate low sampling frequency frames shall occur at a regular rate, with the
reference point of each MPEG-2 AAC half-rate low sampling frequency data-burst beginning
2 048 IEC 60958 frames after the reference point of the preceding MPEG-2 AAC half-rate low
sampling frequency data-burst (of the same bitstream number).
It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-2 AAC
half-rate low sampling frequency bitstream as described in IEC 61937, and that pause databursts be transmitted with a repetition period of 64 IEC 60958 frames, except when other
repetition periods are necessary to fill the precise stream gap length (which may not be a
multiple of 64 IEC 60958 frames) or to meet the requirement on burst spacing (see
IEC 61937).
When a stream gap in an MPEG-2 AAC half-rate low sampling frequency stream is filled by a

sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 2 048
sampling periods following the Pa of the previous MPEG-2 AAC half-rate low sampling
frequency frame. It is recommended that the sequence(s) of pause data-bursts which fill the
stream gap should continue from this point up to (as close as possible to, considering the 64
IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG-2 AAC half-rate low
sampling frequency data-burst which follows the stream gap. The gap-length parameter
contained in the pause data-burst is intended to be interpreted by the MPEG-2 AAC half-rate
low sampling frequency decoder as an indication of the number of decoded PCM samples
which are missing (due to the resulting audio gap).
5.2.4

Latency of MPEG-2 AAC half-rate low sampling frequency decoding

The latency of an external audio decoder to decode the MPEG-2 AAC half-rate low sampling
frequency is defined as the sum of the receiving delay time and the decoding delay time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-2 AAC low sample
rate burst_payload

MPEG-2 AAC frame

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-2 AAC low sample

rate burst_payload

MPEG-2 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay

Latency of MPEG-2 AAC low sampling frequency decoder

Figure 4 – Latency of MPEG-2 AAC half-rate low sampling frequency decoding
EXAMPLE The receiving delay time to receive a whole data-burst with maximum length is
calculated as follows. The length of the preamble is 64 bits. The maximum length of the whole
data-burst payload is 4 096 bits in the Japanese satellite DTV specified maximum bit rate of
96 kbit/s. In this case, the maximum length of data-bursts is 4 096 bits. The receiving delay
time is calculated as 2,667 ms in the case of 48 kHz sampling frequency. The decoding delay
time is calculated as 42,667 ms. It is equal to the decoding time for one MPEG-2 AAC halfrate low sampling frequency frame data. Hence, the latency of MPEG-2 AAC half-rate low
sampling frequency decoding is approximately 45,333 ms.
The absolute maximum length of data-burst is calculated as follows. In order to make a burst,
a minimum stuffing consists of 4 stuffing words (Pz of 16 bits) per burst. The repetition period
of data-burst in IEC 60958 frames is 2 048. Therefore, the maximum length of data-burst leads to
2 048 sample * 2 ch * 16 bit – 4 word * 16 bit = 65 472 bits. The receiving delay time is
calculated as 42,625 ms in the case of 48 kHz sampling frequency (65 472/1 536 000 = 0,042
625). The decoding delay time is 42,667 ms as above. Hence, the latency of the MPEG2 AAC half-rate low sampling frequency decoding is a maximum of 85,29 ms.


- 13 – 12 –

EN 61937-6:2006

BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

For synchronization (for example, with video), the recommended value of latency is 85,29 ms.

EN
61937-6:2006
– 12 –
A shorter
latency is acceptable when synchronization
is not required.

For synchronization
(for example,
with video), low
the recommended
value of latency is 85,29 ms.
5.2.5
The data MPEG-2
AAC quarter-rate
sampling frequency
A shorter latency is acceptable when synchronization is not required.
The stream of the data-bursts for the MPEG-2 AAC quarter-rate low sampling frequency
consists
of sequences
of theAAC
MPEG-2
AAC quarter-rate
low sampling

frequency ADTS frames.
5.2.5
The
data MPEG-2
quarter-rate
low sampling
frequency
The data-type of an MPEG-2 AAC quarter-rate low sampling frequency data-burst is 19 and
the subdata
of an
MPEG-2 AAC
quarter-rate
frequency
is 1. The data-burst
The
stream type
of the
data-bursts
for the
MPEG-2 low
AACsampling
quarter-rate
low sampling
frequency
is headedofwith
a burst-preamble,
followed
the burst-payload,
and stuffed
withADTS

stuffing
bits.
consists
sequences
of the MPEG-2
AACby
quarter-rate
low sampling
frequency
frames.
The
burst-payload
of
each
data-burst
of
the
MPEG-2
AAC
quarter-rate
low
sampling
The data-type of an MPEG-2 AAC quarter-rate low sampling frequency data-burst is 19 and
frequency
data
contain
oneAAC
complete
MPEG-2
quarter-rate

low
sampling
frequency
the
subdata
typeshall
of an
MPEG-2
quarter-rate
sampling
frequency
is
1. The
– 4 – lowAAC
61937-6
Amend.
1 ©data-burst
IEC:2014
ADTS
frame,
and
represents
4
096
samples
for
each
encoded
channel.
The

length
of bits.
the
is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing
MPEG-2
AAC
quarter-rate
low
sampling
frequency
data-burst
depends
on
the
encoded
bit
The burst-payload of each data-burst of the MPEG-2 AAC quarter-rate low sampling
Table 7the
– Data-type-dependent
information
for data-type
rate
(whichdata
determines
MPEG-2
AAC quarter-rate
sampling
frequency
ADTS
frame

frequency
shall contain
one complete
MPEG-2 AAClow
quarter-rate
low
sampling
frequency
MPEG-2
half-rate low sampling
frequency
length).
The reference
to the 4AAC
specification
MPEG-2
AACchannel.
quarter-rate
sampling
ADTS frame,
and represents
096 samplesforforthe
each
encoded
The low
length
of the
frequencyAAC
bitstream,
representing

4 096 samples
of encoded
audio
per frame
be found bit
in
MPEG-2
quarter-rate
low sampling
frequency
data-burst
depends
on may
the encoded
Bits of13818-7.
Pc
Value
Contents
ISO/IEC
rate
(which
determines
the
MPEG-2
AAC
quarter-rate
low
sampling
frequency
ADTS

frame
LSB..MSB
length). The reference to the specification for the MPEG-2 AAC quarter-rate low sampling
8-12
00 representing
No4indication
frequency
bitstream,
096 samples of encoded audio per MPEG-2
frame may
AAC be
low found
samplein
MPEG-2 AAC low
sample
Pa Pb Pc Pd
Pa
Pb
Pc
Pd
ISO/IEC 13818-7.01
LC profile
rate burst_payload
rate burst_payload
02
Reserved
Bit 0 of Pa
Bit 0 of Pa
MPEG-2 AAC low sample
MPEG-2

AAC
low
sample
LC profile
with MPEG Surround
Pa Pb Pc Pd
Pa Pb Pc Pd03
rateAAC
burst_payload
rate
burst_payload
AAC
frame
stuffing
frame
04

LC profile with SBR

Bit 0 of Pa
Bit 0 of Pa
Regular rate05,06
of the MPEG-2 AAC
frames
Reserved
AAC frame
stuffing
07
LC profile with SBR
and MPEG Surround

Repetition
period of the
burst
08-31

AAC frame

Reserved

Regular rate of the MPEG-2 AAC frames

Figure
5 – MPEG-2
low sampling frequency data-burst
Repetition
period AAC
of thequarter-rate
burst
5.2.5 The data MPEG-2 AAC quarter-rate low sampling frequency
The data-type-dependent information for MPEG-2 AAC quarter-rate low sampling frequency is
Figure
MPEG-2
AAC8 quarter-rate
low new
sampling
frequency data-burst
given in Table
8.5 –existing
Replace
the

entire
Table
by the following
Table 8:
The data-type-dependent
for MPEG-2
AAC quarter-rate
low
sampling
frequency is
Table
– Data-type-dependent
information
for data-type
MPEG-2
AAC
8Table
8 –information
Data-type-dependent
information
for data-type
given in Table 8.
quarter-rate
low
sampling
frequency
MPEG-2 AAC quarter-rate low sampling frequency
Bits
of Pc
Value

Contents
Bits
of Pc
Value
Table
8 – Data-type-dependent
information
forContents
data-type
LSB..MSB
quarter-rate low sampling frequency
LSB..MSB
8-12
00
No indication
8-12
0
No indication
Bits of Pc
Value
Contents
01
LC profile
1
LC profile
LSB..MSB
02
Reserved
2, 3
Reserved for future profile

8-12
0
No indication
03
LC profile with MPEG Surround
4
LC profile with SBR
1
LC profile
04
LC profile with SBR
5-31
Reserved
2, 3
Reserved for future profile
05,06
Reserved
4
LC profile with SBR
07
LC profile with SBR and MPEG Surround

MPEG-2 AAC

The reference
point of a MPEG-2 AAC quarter-rate
5-31
Reservedlow sampling frequency data-burst is bit 0
08-31
Reserved

 exactly
of Pa and occur
once every 4 096 sampling periods. The data-burst containing MPEG- 
2 AAC quarter-rate low sampling frequency frames shall occur at a regular rate, with the
reference
point
of ofeach
MPEG-2
AAC
quarter-rate
low sampling
frequency
data-burst
The reference
point
a MPEG-2
AAC
quarter-rate
low sampling
frequency
data-burst
is bit 0
5.2.7
Theoccur
MPEG-4
AAC
beginning
4data
096 exactly
IEC 60958

frames
the reference
point
of data-burst
the preceding
MPEG-2
AAC
of
Pa and
once
every 4after
096 sampling
periods.
The
containing
MPEGquarter-rate
low sampling
frequencyfrequency
data-burstframes
(of the shall
sameoccur
bitstream
2
AAC quarter-rate
low sampling
at anumber).
regular rate, with the
Replace the entire existing Table 9 by the following new Table 9:
reference point of each MPEG-2 AAC quarter-rate low sampling frequency data-burst
beginning 4 096 IEC 60958 frames after the reference point of the preceding MPEG-2 AAC

quarter-rate low sampling frequency data-burst (of the same bitstream number).


BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

- 14 – 13 –

EN 61937-6:2006

It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-2 AAC
quarter-rate low sampling frequency bitstream as described in IEC 61937, and that pause
data-bursts be transmitted with a repetition period of 128 IEC 60958 frames, except when
other repetition periods are necessary to fill the precise stream gap length (which may not be
a multiple of 128 IEC 60958 frames), or to meet the requirement on burst spacing (see
IEC 61937).
When a stream gap in an MPEG-2 AAC quarter-rate low sampling frequency stream is filled
by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located
4 096 sampling periods following the Pa of the previous MPEG-2 AAC quarter-rate low
sampling frequency frame. It is recommended that the sequence(s) of pause data-bursts
which fill the stream gap should continue from this point up to (as close as possible to,
considering the 64 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG2 AAC quarter-rate low sampling frequency data-burst which follows the stream gap. The gaplength parameter contained in the pause data-burst is intended to be interpreted by the
MPEG-2 AAC quarter-rate low sampling frequency decoder as an indication of the number of
decoded PCM samples which are missing (due to the resulting audio gap).
5.2.6

Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding

The latency of an external audio decoder to decode MPEG-2 AAC quarter-rate low sampling
frequency is defined as the sum of the receiving delay time and the decoding delay time.

Pa Pb Pc Pd
Bit 0 of Pa

MPEG-2 AAC low sample
rate burst_payload

MPEG-2 AAC frame

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-2 AAC low sample
rate burst_payload

MPEG-2 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay

Latency of MPEG-2 AAC low sampling frequency decoder

Figure 6 – Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding
The absolute maximum length of data-burst is calculated as follows. In order to make a burst,
a minimum stuffing consists of 4 stuffing words (Pz of 16 bit) per burst. The repetition period of
data-burst in IEC 60958 frames is 4 096. Therefore, the maximum length of a data-burst leads to

4 096 sample * 2 ch * 16 bit – 4 word * 16 bit =131 008 bit. The receiving delay time is
calculated as 85,29 ms in the case of the 48 kHz sampling frequency (131 008/1 536 000 =
0,085 29). The decoding delay time is 85,33 ms as above. Hence, the latency of MPEG2 AAC quarter-rate low sampling frequency decoding is a maximum of 170,62 ms.
For synchronization (for example, with video), the recommended value of latency is
170,62 ms. A shorter latency is acceptable when synchronization is not required.
5.2.7

The data MPEG-4 AAC

The stream of the data-bursts for MPEG-4 AAC consists of sequences of MPEG-4 AAC ADTS
frames. The data-type of a MPEG-4 AAC data-burst is 20. And the subdata type of an MPEG4 AAC is 0. The data-burst is headed with a burst-preamble, followed by the burst-payload,
and stuffed with stuffing bits. The burst-payload of each data-burst of MPEG-4 AAC data shall
contain one complete MPEG-4 AAC ADTS frame and represents 1 024 samples for each
encoded channel. The length of the MPEG-4 AAC data-burst depends on the encoded bit rate
(which determines the MPEG-4 AAC ADTS frame length). The reference to the specification
for the MPEG-4 AAC bitstream, representing 1 024 samples of encoded audio per frame, is
found in ISO/IEC 14496-3 .


EN 61937-6:2006

Pa Pb Pc Pd

– 14 –
- 15 -

MPEG-4 AAC
burst_payload

BS EN 61937-6:2006+A1:2014

IEC 61937-6:2006+A1:2014

Pa Pb Pc Pd

MPEG-4 AAC
burst_payload

Bit 0 of Pa

Bit 0 of Pa
AAC frame

Stuffing

AAC frame

EN 61937-6:2006
Regular rate of the MPEG-4 AAC frames – 14 –
Repetition period of the burst

Figure
MPEG-4
AAC 7 – MPEG-4 AAC data-burst
MPEG-4 AAC
Pa Pb Pc Pd
burst_payload
burst_payload
61937-6
Amend. 1 © IEC:2014
– 5 – AAC is given in Table 9.

The
information for MPEG-4
Bit 0 of Pa
Bit 0data-type-dependent
of Pa
Pa Pb Pc Pd

AAC frame
Stuffing
AAC
frame
 Table 9 – Data-type-dependent
information
for data-type MPEG-4
AAC
Regular
rate of the
MPEG-4 AAC frames Contents
Bits
of Pc Value
Value
Contents
Bits
of
Pc
LSB..MSB
LSB..MSB
Repetition period of the burst
8-12
00

No indication
8-12
00
No indication
01
AAC profile, format for transmission is ADTS
01
AAC AAC
profile,data-burst
format for transmission is ADTS
Figure 7 – MPEG-4
02
Reserved
02, 03
Reserved for future profile
03
AAC profile with MPEG Surround, format for transmission is ADTS, MPEG
The data-type-dependent
information for MPEG-4
AAC
is given
in
9.
04
HE-AAC
profile,
format
forTable
transmission
is ADTS

Surround data complies
to MPEG
Surround
baseline profile
05-3104

HE-AAC profile,Reserved
format for transmission is ADTS

Table 9 – Data-type-dependent information for data-type MPEG-4 AAC
05

Reserved

13
02, 03

Reserved

The
point
of an MPEG-4
AAC
data-burst
bit 0 offormat
Pa and
occurs exactly
Bits reference
of Pc
Value

Contents
06
HE-AAC
profile
with MPEGisSurround,
for transmission
is ADTS,once
every
1
024
sampling
periods.
The
data-burst
containing
MPEG-4
AAC
frames
shall
occur at
MPEG
Surround
data
complies
to
MPEG
Surround
baseline
profile
LSB..MSB

a regular rate, with the reference point of each MPEG-4 AAC data-burst beginning 1 024
Reserved
8-12 60958 frames
00 07-11
No the
indication
IEC
after the reference point of
preceding MPEG-4 AAC data-burst (of the
12
HE-AAC
V2
profile,
format
transmission
is ADTS.is ADTS
same bitstream
number).
01
AAC profile,for
format
for transmission
Reserved for future profile

It is recommended
that pause data-bursts
used
fill stream gaps
infor
the

MPEG-4 is
AAC
bitHE-AAC V2 are
profile
with to
MPEG
transmission
ADTS,
04 14
HE-AAC
profile,Surround,
format forformat
transmission
is ADTS
stream as described in IEC 61937
andSurround
that pause
data-bursts
be Surround
transmitted
withprofile.
a repetition
MPEG
data complies
to MPEG
baseline
period of 32 05-31
IEC 60958 frames, except whenReserved
other repetition periods are necessary to fill the
15-31

Reserved
precise stream gap length (which may not be a multiple of 32 IEC 60958 frames) or to meet 
the requirement on burst spacing (see IEC 61937).
The reference point of an MPEG-4 AAC data-burst is bit 0 of Pa and occurs exactly once
every
024data
sampling
periods.
The data-burst
containing
MPEG-4 AAC frames shall occur at
5.2.9 1
The
MPEG-4
AAC half-rate
low sampling
frequency
When
a stream
anreference
MPEG-4 AAC
is filled
by aAAC
sequence
of pause
data-bursts,
a regular
rate, gap
with in
the

pointstream
of each
MPEG-4
data-burst
beginning
1 024
the
Pa
of
the
first
pause
data-burst
shall
be
located
1
024
sampling
periods
following
Pa
IEC 60958
after theTable
reference
of the preceding
MPEG-4
AAC data-burst the
(of the
Replace

theframes
entire existing
10 bypoint
the following
new Table
10:
of
the
previous
MPEG-4
AAC
frame.
It
is
recommended
that
the
sequence(s)
of
pause
datasame bitstream number).
bursts which fill the stream gap should continue from this point up to (as close as possible to,
Table
– Data-type-dependent
information
for data-type
considering the 32
IEC 10
60958
frame length of the pause

data-burst)
the Pa of the first MPEGIt
is recommended
thatMPEG-4
pause
data-bursts
aregap.
used
to fill
stream
gaps
in the MPEG-4
AAC
AAC
low The
sampling
frequency
4 AAC
data-burst which
follows
the half-rate
stream
gap-length
parameter
contained
in bitthe
stream
as
described
in

IEC
61937
and
that
pause
data-bursts
be
transmitted
with
a
repetition
pause data-burst is intended to be interpreted by the MPEG-4 AAC decoder as an indication
period
of
60958
frames,
except when
repetition
periods
necessary
fill the
Bitsnumber
of 32
Pc IEC
Value
Contents
of the
of decoded
PCM samples
whichother

are missing
(due
to the are
resulting
audiotogap).
LSB..MSB
precise
stream gap length (which may not be a multiple of 32 IEC 60958 frames) or to meet
the
requirement on
(see
IEC 61937).
8-12
00 burst spacingNo
indication
5.2.8
Latency of MPEG-4 AAC decoding
01

AAC profile, format for transmission is ADTS

When
a stream
gap
in an MPEG-4
AAC stream
is filled
by a AAC
sequence
of pause

The latency
of an
external
audio Reserved
decoder
to decode
MPEG-4
is defined
as thedata-bursts,
sum of the
02pause data-burst
the
Pa
of
the
first
shall
be
located
1
024
sampling
periods
following the Pa
receiving delay time and the decoding delay time.
of the previous MPEG-4
AAC frame.
It is with
recommended
thatformat

the sequence(s)
pauseMPEG
data03
AAC profile
MPEG Surround,
for transmission of
is ADTS,
Surroundcontinue
data complies
MPEG
Surround
profile
bursts which fill the stream gap should
fromto this
point
up tobaseline
(as close
as possible to,
considering the 32
length
of format
the pause
data-burst)
the Pa of the first MPEG04 IEC 60958 frame
HE-AAC
profile,
for transmission
is ADTS
4 AAC data-burst which follows the stream gap. The gap-length parameter contained in the
pause data-burst05is intended to Reserved

be interpreted by the MPEG-4 AAC decoder as an indication
HE-AAC profile
with
MPEG
Surround,
transmission
is ADTS,
of the number of 06
decoded PCM samples
which
are
missing
(dueformat
to theforresulting
audio
gap).
MPEG Surround data complies to MPEG Surround baseline profile

5.2.8

Latency07-11
of MPEG-4
12

Reserved
AAC
decoding
HE-AAC V2 profile, format for transmission is ADTS

The latency of an external audio decoder to decode MPEG-4 AAC is defined as the sum of the

13 and the decoding
Reserved
receiving delay time
delay time.


the Pa of the first pause data-burst shall be located 1 024 sampling periods following the Pa
of the previous MPEG-4 AAC frame. It is recommended that the sequence(s) of pause databursts which fill the stream gap should continue from this point up to (as close as possible to,
considering
the 32 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEGBS EN 61937-6:2006+A1:2014
4 AAC data-burst which follows the stream gap. The gap-length parameter contained in the
IEC 61937-6:2006+A1:2014
- 16 pause data-burst is intended to be interpreted by the MPEG-4 AAC decoder as an indication
of the number of decoded PCM samples which are missing (due to the resulting audio gap).
5.2.8

Latency of MPEG-4 AAC decoding

The latency of an external audio decoder to decode MPEG-4 AAC is defined as the sum of the
EN 61937-6:2006
15 –
receiving delay time and the decoding delay–time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-4 AAC
burst-payload
MPEG-4 AAC frame

MPEG-4 AAC

Burst-payload

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-4 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay

Latency of MPEG-4 AAC decoder

Figure 7 – Latency of MPEG-4 AAC decoding
The absolute maximum length of the data-burst is calculated as follows. In order to make a
burst, a minimum stuffing consists of 4 stuffing words (Pz of 16 bit) per burst. The repetition
period of data-burst in IEC 60958 frames is 1 024. Therefore, the maximum length of data-burst
leads to 1 024 sample * 2 ch * 16 bit – 4 word * 16 bit = 32 704 bits. The receiving delay time
is calculated as 21,29 ms in the case of the 48 kHz sampling frequency (32 704/1 36 000 =
0,021 9) The decoding delay time is 21,33 ms as above. Hence, the latency of MPEG-4 AAC
decoding is a maximum of 42,62 ms.
For synchronization (for example, with video), the recommended value of latency is 42,62 ms.
A shorter latency is acceptable when synchronization is not required.
5.2.9

The data MPEG-4 AAC half-rate low sampling frequency

The stream of the data-bursts for MPEG-4 AAC half-rate low sampling frequency consists of
sequences of MPEG-4 AAC low sampling frequency ADTS frames. The data-type of an
MPEG-4 AAC low sampling frequency data-burst is 20 and the subdata type of an MPEG4 AAC half-rate low sampling frequency is 1. The data-burst is headed with a burst-preamble,
followed by the burst-payload, and stuffed with stuffing bits. The burst-payload of each databurst of MPEG-4 AAC half-rate low sampling frequency data shall contain one complete
MPEG-4 AAC half-rate low sampling frequency ADTS frame and represents 2 048 samples for
each encoded channel. The length of the MPEG-4 AAC half-rate low sampling frequency
data-burst depends on the encoded bit rate (which determines the MPEG-4 AAC half-rate low
sampling frequency ADTS frame length). The reference to the specification for the MPEG4 AAC half-rate low sampling frequency bitstream, representing 2 048 samples of encoded
audio per frame is found in ISO/IEC 14496-3.

Pa Pb Pc Pd

MPEG-4 AAC low sample rate

Pa Pb Pc Pd

burst_payload

MPEG-4 AAC low sample rate

burst_payload

Bit 0 of Pa

Bit 0 of Pa
AAC frame

Stuffing

AAC frame

Regular rate of the MPEG-4 AAC frames
Repetition period of the burst
Figure 8 – MPEG-4 AAC half-rate low sampling frequency data-burst
The data-type-dependent information for MPEG-4 AAC half-rate low sampling frequency is
given in Table 10.


Reserved
Regular rate13of the MPEG-4 AAC
frames
14

HE-AAC V2 profile with MPEG Surround, format for transmission is ADTS,

MPEG
Surround data complies to MPEG Surround baseline profile.
Repetition period of the
burst
BS EN 61937-6:2006+A1:2014
15-31
Reserved
IEC 61937-6:2006+A1:2014
- 17 -

Figure 8 – MPEG-4 AAC half-rate low sampling frequency data-burst
5.2.9 The data MPEG-4 AAC half-rate low sampling frequency
The data-type-dependent information for MPEG-4 AAC half-rate low sampling frequency is
given

in Table
10. existing Table 10 by the following new Table 10:
Replace
the entire
 Table 10 – Data-type-dependent information for data-type
MPEG-4 AAC half-rate low sampling frequency
Bits of Pc
LSB..MSB

Value

8-12

Contents

00

No indication

01

AAC profile, format for transmission is ADTS

02

Reserved

03

AAC profile with MPEG Surround, format for transmission is ADTS, MPEG

Surround data complies to MPEG Surround baseline profile

EN 61937-6:2006

– 16 –

Table 10
– Data-type-dependent
information for data-type MPEG-4 AAC
04
HE-AAC profile, format for transmission is ADTS
half-rate low sampling frequency
05

Bits of Pc

Reserved

Value
06

HE-AAC profile Contents
with MPEG Surround, format for transmission is ADTS,
MPEG Surround data complies to MPEG Surround baseline profile

LSB..MSB
8-12

0
1

2, 3
4

07-11
12
13
14

5-31 15-31



Reserved

No indication
HE-AAC V2 profile, format for transmission is ADTS
AAC profile, Format for transmission is ADTS
Reserved
Reserved for future profile
HE-AAC V2 profile with MPEG Surround, format for transmission is ADTS,
HE-AAC profile, format for transmission is ADTS
MPEG Surround data complies to MPEG Surround baseline profile.
Reserved

Reserved



The reference point of an MPEG-4 AAC half-rate low sampling frequency data-burst is bit 0 of
5.2.11

The data
MPEG-4
quarter-rate
low sampling
frequency
Pa and occurs
exactly
onceAAC
every
2 048 sampling
periods. The
data-burst containing MPEG4 AAC half-rate low sampling frequency frames shall occur at a regular rate, with the
Replace
entire
Table 11
by half-rate
the following
new Tablefrequency
11:
referencethe
point
of existing
each MPEG-4
AAC
low sampling
data-burst beginning
2 048 IEC 60958 frames after the reference point of the preceding MPEG-4 AAC half-rate low
sampling frequency data-burst (of the same bitstream number).
It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-4 AAC
half-rate low sampling frequency bitstream, as described in IEC 61937, and that pause databursts be transmitted with a repetition period of 64 IEC 60958 frames, except when other

repetition periods are necessary to fill the precise stream gap length (which may not be a
multiple of 64 IEC 60958 frames) or to meet the requirement on burst spacing (see
IEC 61937).
When a stream gap in an MPEG-4 AAC half-rate low sampling frequency stream is filled by a
sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 2 048
sampling periods following the Pa of the previous MPEG-4 AAC half-rate low sampling
frequency frame. It is recommended that the sequence(s) of pause data-bursts which fill the
stream gap should continue from this point up to (as close as possible to, considering the 64
IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG-4 AAC half-rate low
sampling frequency data-burst which follows the stream gap. The gap-length parameter
contained in the pause data-burst is intended to be interpreted by the MPEG-4 AAC half-rate
low sampling frequency decoder as an indication of the number of decoded PCM samples
which are missing (due to the resulting audio gap).
5.2.10

Latency of MPEG-4 AAC half-rate low sampling frequency decoding

The latency of an external audio decoder to decode MPEG-4 AAC half-rate low sampling
frequency is defined as the sum of the receiving delay time and the decoding delay time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame


low sampling frequency decoder as an indication of the number of decoded PCM samples
which are missing (due to the resulting audio gap).
5.2.10
Latency of MPEG-4 AAC half-rate low sampling frequency decoding
BS
EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014
- 18 -

The latency of an external audio decoder to decode MPEG-4 AAC half-rate low sampling
frequency is defined as the sum of the receiving delay time and the decoding delay time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

Pa Pb Pc Pd

MPEG-4 AAC frame

Stuffing

Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay
Latency of MPEG-4 AAC decoder

EN 61937-6:2006
– 17 – low sampling frequency
Figure 9 – Latency of MPEG-4 AAC half-rate
decoding
The absolute maximum length of the data-burst is calculated as follows. In order to make a
burst, a minimum stuffing consists of 4 stuffing words (Pz of 16 bit) per burst. The repetition
period of data-burst in IEC 60958 frames is 2 048. Therefore, the maximum length of data-burst
leads to 2 048 sample * 2 ch * 16 bit – 4 word * 16 bit = 65 472 bits. The receiving delay time
is calculated as 42,625 ms in the case of 48 kHz sampling frequency (65 472/1 536 000 =
0,042 625). The decoding delay time is 42,667 ms as above. Hence, the latency of MPEG2 AAC half-rate low sampling frequency decoding is a maximum of 85,29 ms.
For synchronization (for example, with video), the recommended value of latency is 85,29 ms.
A shorter latency is acceptable when synchronization is not required.
5.2.11

The data MPEG-4 AAC quarter-rate low sampling frequency

The stream of the data-bursts for MPEG-4 AAC quarter-rate low sampling frequency consists
of sequences of MPEG-4 AAC quarter-rate low sampling frequency ADTS frames. The datatype of a MPEG-4 AAC quarter-rate low sampling frequency data-burst is 20 and the subdata
type of a MPEG-4 AAC quarter-rate low sampling frequency is 2. The data-burst is headed
with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits. The burstpayload of each data-burst of MPEG-4 AAC quarter-rate low sampling frequency data shall
contain one complete MPEG-4 AAC quarter-rate low sampling frequency ADTS frame, and
represents 4 096 samples for each encoded channel. The length of the MPEG-4 AAC quarterrate low sampling frequency data-burst depends on the encoded bit rate (which determines
the MPEG-4 AAC quarter-rate low sampling frequency ADTS frame length). The reference to
the specification for the MPEG-4 AAC quarter-rate low sampling frequency bit stream,
representing 4 096 samples of encoded audio per frame is found in ISO/IEC 14496-3.
Pa Pb Pc Pd

MPEG-4 AAC low sample
rate burst_payload

Pa Pb Pc Pd

MPEG-4 AAC low sample
rate burst_payload

Bit 0 of Pa

Bit 0 of Pa
AAC frame

Stuffing

AAC frame

Regular rate of the MPEG-4 AAC frames

Repetition period of the burst
Figure 10 – MPEG-4 AAC quarter-rate low sampling frequency data-burst
The data-type-dependent information for MPEG-4 AAC quarter-rate low sampling frequency is
given in Table 11.
Table 11 – Data-type-dependent information for data-type MPEG-4 AAC
quarter-rate low sampling frequency
Bits of Pc

Value

Contents

0

No indication

LSB..MSB
8-12


BS EN 61937-6:2006+A1:2014
IEC 61937-6:2006+A1:2014

- 19 –6–

61937-6 Amend. 1 © IEC:2014

Table 11 – Data-type-dependent information for data-type
MPEG-4 AAC quarter-rate low sampling frequency
Bits of Pc

LSB..MSB
8-12

Value

Contents

00

No indication

01

AAC profile, format for transmission is ADTS

02

Reserved for future profile

03

AAC profile with MPEG Surround, format for transmission is ADTS, MPEG
Surround data complies to MPEG Surround baseline profile

04

HE-AAC profile, format for transmission is ADTS

05

Reserved

06

HE-AAC profile with MPEG Surround, format for transmission is ADTS,
MPEG Surround data complies to MPEG Surround baseline profile

07-11

Reserved

12

HE-AAC V2 profile, format for transmission is ADTS.

13

Reserved

14

HE-AAC V2 profile with MPEG Surround, format for transmission is ADTS,
MPEG Surround data complies to MPEG Surround baseline profile.

EN 61937-6:2006
 15-31

Reserved

– 18 –



The reference point of a MPEG-4 AAC quarter-rate low sampling frequency data-burst is bit 0
of Pa and occurs exactly once every 4 096 sampling periods. The data-burst containing
MPEG-4 AAC quarter-rate low sampling frequency frames shall occur at a regular rate, with
the reference point of each MPEG-4 AAC quarter-rate low sampling frequency data-burst
_____________
beginning 4 096 IEC 60958 frames after
the reference point of the preceding MPEG-4 AAC
quarter-rate low sampling frequency data-burst (of the same bitstream number).
It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-4 AAC
quarter-rate low sampling frequency bitstream as described in IEC 61937, and that pause
data-bursts be transmitted with a repetition period of 64 IEC 60958 frames, except when other
repetition periods are necessary to fill the precise stream gap length (which may not be a
multiple of 128 IEC 60958 frames) or to meet the requirement on burst spacing (see
IEC 61937).
When a stream gap in an MPEG-4 AAC quarter-rate low sampling frequency stream is filled
by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located
4 096 sampling periods following the Pa of the previous MPEG-4 AAC quarter-rate low
sampling frequency frame. It is recommended that the sequence(s) of pause data-bursts
which fill the stream gap should continue from this point up to (as close as possible to,
considering the 128 IEC 60958 frame length of the pause data-burst) the Pa of the first
MPEG-4 AAC quarter-rate low sampling frequency data-burst which follows the stream gap.
The gap-length parameter contained in the pause data-burst is intended to be interpreted by
the MPEG-4 AAC quarter-rate low sampling frequency decoder as an indication of the number
of decoded PCM samples which are missing (due to the resulting audio gap).
5.2.12

Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding

The latency of an external audio decoder to decode MPEG-4 AAC quarter-rate low sampling
frequency is defined as the sum of the receiving delay time and the decoding delay time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay


the MPEG-4 AAC quarter-rate low sampling frequency decoder as an indication of the number
of decoded PCM samples which are missing (due to the resulting audio gap).

BS EN 61937-6:2006+A1:2014
5.2.12 Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding
IEC 61937-6:2006+A1:2014
- 20 The latency of an external audio decoder to decode MPEG-4 AAC quarter-rate low sampling
frequency is defined as the sum of the receiving delay time and the decoding delay time.
Pa Pb Pc Pd
Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame

Pa Pb Pc Pd

Stuffing

Bit 0 of Pa

MPEG-4 AAC low sample
rate burst_payload

MPEG-4 AAC frame

Repetition period of the burst
Receiving delay

Decoding delay

Latency of MPEG-4 AAC low sampling frequency decoder
Figure 11 – Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding
The absolute maximum length of data-burst is calculated as follows. In order to make burst, a
minimum stuffing consists of 4 stuffing words (Pz of 16 bit) per burst. The repetition period of
data-burst in IEC 60958 frames is 4 096. Therefore, the maximum length of data-burst leads to
4 096 sample * 2 ch * 16 bit – 4 word * 16 bit =131 008 bit. The receiving delay time is
calculated as 85,29 ms in the case of the 48 kHz sampling frequency (131 008/1 536 000 =
0,085 29). The decoding delay time is 85,33 ms as above. Hence, the latency of MPEG4 AAC quarter-rate low sampling frequency decoding is a maximum of 170,62 ms.
For synchronization (for example, with video), the recommended value of latency is
170,62 ms. A shorter latency is acceptable when
EN 61937-6:2006
– 19 –synchronization is not required.
5.2.13

The data MPEG-4 AAC double-rate high sampling frequency

The stream of the data-bursts for MPEG-4 AAC double-rate high sampling frequency consists
of sequences of MPEG-4 AAC double-rate high sampling frequency ADTS frames. The datatype of an MPEG-4 AAC double-rate high sampling frequency data-burst is 20, and the subdata type of an MPEG-4 AAC double-rate high sampling frequency is 3. The data-burst is
headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits.
The burst-payload of each data-burst of the MPEG-4 AAC double-rate high sampling
frequency data shall contain one complete MPEG-4 AAC double-rate high sampling frequency
ADTS frame, and represents 4 096 samples for each encoded channel. The length of the
MPEG-4 AAC double-rate high sampling frequency data-burst depends on the encoded bit
rate (which determines the MPEG-4 AAC double-rate high sampling frequency ADTS frame
length). The reference to the specification for the MPEG-4 AAC double-rate high sampling
frequency bit stream, representing 512 samples of encoded audio per frame may be found in
ISO/IEC 14496-3.
Pa Pb Pc Pd

MPEG-4 AAC high sample

rate burst_payload

Pa Pb Pc Pd

MPEG-4 AAC high sample
rate burst_payload

Bit 0 of Pa

Bit 0 of Pa
AAC frame

Stuffing

AAC frame

Regular rate of the MPEG-4 AAC frames
Repetition period of the burst
Figure 12 – MPEG-4 AAC double-rate high sampling frequency data-burst
The data-type-dependent information for the MPEG-4 AAC double-rate high sampling
frequency is given in Table 12.
Table 12 – Data-type-dependent information for data-type MPEG-4 AAC
double-rate high sampling frequency
Bits of Pc

Value

Contents