EN 61937-3:2009

Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 3: Non-linear PCM bitstreams according to the AC-3 and enhanced AC-3 formats

It describes the method used to convey non-linear PCM bitstreams encoded according to the AC-3 and enhanced AC-3 formats.c) It contains the following significant technical changes with respect to the previous edition: The definition of the audio data-burst required to deliver enhanced AC-3 bitstreams has been added. The definition of the latency of an enhanced AC-3 decoder has been added. The use of pause data-bursts when delivering enhanced AC-3 bitstreams has been added.

Digitalton - Schnittstelle für nichtlinear-PCM-codierte Audio-Bitströme unter Verwendung von IEC 60958 - Teil 3: Nichtlineare PCM-Bitströme nach dem AC-3- und dem erweiterten AC-3-Format

Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire conformément à la CEI 60958 - Partie 3: Flux de bits MIC non linéaire conformément aux formats AC-3 et AC-3 amélioré

La CEI 61937-3:2007 décrit la méthode utilisée pour acheminer des flux de bits MIC non linéaire codés selon les formats AC-3 et AC-3 amélioré. Cette seconde édition de la CEI 61937-3 annule et remplace la première édition parue en 2003. La présente édition contient les importantes modifications techniques suivantes par rapport à la précédente édition. La définition de la salve de données audio nécessaire pour délivrer des flux de bits au format AC-3 amélioré a été ajoutée. La définition de la latence d'un décodeur AC-3 amélioré a été ajoutée. L'utilisation de salves de données de type Pause lorsque des flux de bits au format AC-3 amélioré sont délivrés a été ajoutée.

Digitalni avdio - Vmesnik za nelinearne PCM-kodirane avdio bitne tokove po IEC 60958 - 3. del: Nelinearni PCM-bitni tokovi skladno s formatom AC-3 in izboljšanim formatom AC-3 (IEC 61937-3:2007)

General Information

• Status: Withdrawn
• Publication Date: 12-Aug-2009
• ICS: 33.160.30 - Audio systems
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Drafting Committee: IEC/TC 100 - IEC_TC_100
• Parallel Committee: IEC/TC 100 - IEC_TC_100
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 13-Mar-2019
• Ref Project: SIST EN 61937-3:2009 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 3: Non-linear PCM bitstreams according to the AC-3 and enhanced AC-3 formats (IEC 61937-3:2007)

Relations

• Replaces: EN 61937-3:2003 - Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 3: Non-linear PCM bitstreams according to the AC-3 format
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2009
1DGRPHãþD
SIST EN 61937-3:2004
Digitalni avdio - Vmesnik za nelinearne PCM-kodirane avdio bitne tokove po IEC
60958 - 3. del: Nelinearni PCM-bitni tokovi skladno s formatom AC-3 in izboljšanim
formatom AC-3 (IEC 61937-3:2007)
Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC
60958 - Part 3: Non-linear PCM bitstreams according to the AC-3 and enhanced AC-3
formats (IEC 61937-3:2007)
Digitalton - Schnittstelle für nichtlinear-PCM-codierte Audio-Bitströme unter Verwendung
von IEC 60958 - Teil 3: Nichtlineare PCM-Bitströme nach dem AC-3- und dem
erweiterten AC-3-Format (IEC 61937-3:2007)
Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire
conformément à la CEI 60958 - Partie 3: Flux de bits MIC non linéaire conformément aux
formats AC-3 et AC-3 amélioré (CEI 61937-3:2007)
Ta slovenski standard je istoveten z: EN 61937-3:2009
ICS:
33.160.30 Avdio sistemi Audio systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61937-3
NORME EUROPÉENNE
August 2009
EUROPÄISCHE NORM
ICS 33.160.30 Supersedes EN 61937-3:2003

English version
Digital audio -
Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 -
Part 3: Non-linear PCM bitstreams according to the AC-3
and enhanced AC-3 formats
(IEC 61937-3:2007)
Audionumérique -  Digitalton -
Interface pour les flux de bits audio Schnittstelle für nichtlinear-PCM-codierte
à codage MIC non linéaire Audio-Bitströme unter Verwendung
conformément à la CEI 60958 - von IEC 60958 -
Partie 3: Flux de bits MIC non linéaire Teil 3: Nichtlineare PCM-Bitströme
conformément aux formats AC-3 nach dem AC-3- und dem erweiterten
et AC-3 amélioré AC-3-Format
(CEI 61937-3:2007) (IEC 61937-3:2007)

This European Standard was approved by CENELEC on 2009-07-01. 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 three official versions (English, French, 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, Bulgaria, 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: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61937-3:2009 E
Foreword
The text of document 100/1207/CDV, future edition 2 of IEC 61937-3, prepared by technical area 4,
Digital system interfaces, of IEC TC 100, Audio, video and multimedia systems and equipment, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61937-3 on
2009-07-01.
This European Standard supersedes EN 61937-3:2003.
– the definition of the audio data-burst required to deliver enhanced AC-3 bitstreams has been added;
– the definition of the latency of an enhanced AC-3 decoder has been added;
– the use of pause data-bursts when delivering enhanced AC-3 bitstreams has been added.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61937-3:2007 was approved by CENELEC as a European
Standard without any modification.
__________
– 3 – EN 61937-3:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

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

IEC 60958 Series Digital audio interface EN 60958 Series

IEC 61937-1 2007 Digital audio - Interface for non-linear PCM EN 61937-1 2007
encoded audio bitstreams applying
IEC 60958 -
Part 1: General
IEC 61937-2 2007 Digital audio - Interface for non-linear PCM EN 61937-2 2007
encoded audio bitstreams applying
IEC 60958 -
Part 2: Burst-info
1)
ETSI TS - Digital Audio Compression (AC-3, Enhanced - -
102 366 AC-3)
1)
ATSC A/52B - Digital Audio Compression (AC-3, E-AC-3), - -
Rev. B
1)
Undated reference.
IEC 61937-3
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
Digital audio – Interface for non-linear PCM encoded audio bitstreams applying
IEC 60958 –
Part 3: Non-linear PCM bitstreams according to the AC-3 and enhanced AC-3
formats
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
M
ICS 33.160.30 ISBN 2-8318-9360-7

– 2 – 61937-3 © IEC:2007(E)
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references.5
3 Terms, definitions and abbreviations .5
3.1 Terms and definitions.5
3.2 Abbreviations.6
4 Mapping of the audio bitstream on to IEC 61937-1 .6
4.1 General .6
4.2 AC-3 and enhanced AC-3 burst-info.6
5 Format of AC-3 and enhanced AC-3 data-bursts .6
5.1 General .6
5.2 Pause data-burst .7
5.3 Audio data-bursts .7
5.3.1 AC-3 data .7
5.3.2 Latency of AC-3 decoding .8
5.3.3 Enhanced AC-3 data.9
5.3.4 Latency of the enhanced AC-3 decoder .10

Bibliography .13

Figure 1 – AC-3 data-burst, with reference point R .7
Figure 2 – Latency of AC-3 decoding.8
Figure 3 – Enhanced AC-3 data-burst.10
Figure 4 – Latency of enhanced AC-3 decoding .11

Table 1 – Fields of burst-info.6
Table 2 – Repetition period of the pause data-bursts .7
Table 3 – Data-type-dependent information when data-type = 1 .7
Table 4 – Data-type-dependent information when data-type = 21 .10
Table 5 – Frame repetition period and maximum data rate for enhanced AC-3
bitstreams.10

61937-3 © IEC:2007(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958 –

Part 3: Non-linear PCM bitstreams according to
the AC-3 and enhanced AC-3 formats

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61937-3 has been prepared by technical area 4: Digital system
interfaces, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
This second edition of IEC 61937-3 cancels and replaces the first edition published in 2003.
This edition contains the following significant technical changes with respect to the previous
edition.
a) The definition of the audio data-burst required to deliver enhanced AC-3 bitstreams has
been added.
b) The definition of the latency of an enhanced AC-3 decoder has been added.
c) The use of pause data-bursts when delivering enhanced AC-3 bitstreams has been added.

– 4 – 61937-3 © IEC:2007(E)
The text of this standard is based on the following documents:
CDV Report on voting
100/1207/CDV 100/1291/RVC
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 list of all the parts of the IEC 61937 series, under the general title Digital audio – Interface
for non-linear PCM encoded aud
...