IEC 61937-6:2002

INTERNATIONAL IEC
STANDARD
61937-6
First edition
2002-08
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 format
Reference number
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INTERNATIONAL IEC
STANDARD
61937-6
First edition
2002-08
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 format
 IEC 2002  Copyright - all rights reserved
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International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 61937-6  IEC:2002(E)
CONTENTS
1 Scope . 4

2 Normative references. 4

3 Definitions and terminology. 4

4 Mapping of the audio bitstream on to IEC 61937-1. 5

5 Format of MPEG-2 AAC data-bursts . 5

5.1 General . 5

5.2 Pause data-burst . 5

5.3 Audio data-bursts . 5
5.3.1 The data MPEG-2 AAC . 5
5.3.2 Latency of MPEG-2 AAC decoding. 6
Figure 1 – MPEG-2 AAC data-burst. 6
Figure 2 – Latency of MPEG-2 AAC decoding . 7
Table 1 – Fields of burst-info.5
Table 2 – Repetition period of Pause data-bursts . 5
Table 3 – Data-type-dependent information for data-type MPEG-2 AAC . 6

61937-6  IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
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 format
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61937-6 has been prepared by technical area 4, Digital system
interfaces, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/500/FDIS 100/536/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
2005. At this date, the publication will be:
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 61937-6  IEC:2002(E)
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 format
1 Scope
This part of IEC 61937 specifies the method for the digital audio interface specified in
IEC 60958 to convey non-linear PCM bitstreams encoded in accordance with the MPEG-2
AAC (Advanced Audio Coding) format.
NOTE MPEG-2 AAC is specified in ISO/IEC 13818-7.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60958-1, Digital audio interface – Part 1: General
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 61937-1, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 1: General
IEC 61937-2, Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 – Part 2: Burst-information
ISO/IEC 13818-7, Information technology – Generic coding of moving pictures and associated
audio information – Part 7: Advanced Audio Coding (AAC)
3 Definitions and terminology
3.1 Definitions
For the purposes of this standard, the following definitions apply.

3.1.1
LC profile
low complexity profile identified in ISO/IEC 13818-7: MPEG-2 AAC standard
3.1.2
latency
delay time of an external audio decoder to decode a MPEG-2 AAC data-burst defined as the
sum of two values of the receiving delay time and the decoding delay time
3.2 Abbreviations
AAC Advanced Audio Coding
ADTS Audio Data Transport Stream
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To be published.
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