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Withdrawn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
Current Stage
6060 - Document made available
Start Date
13-Aug-2009
Completion Date
13-Aug-2009

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SLOVENSKI STANDARD
SIST EN 61937-3:2009
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
SIST EN 61937-3:2009 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61937-3:2009
---------------------- Page: 2 ----------------------
SIST EN 61937-3:2009
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
---------------------- Page: 3 ----------------------
SIST EN 61937-3:2009
EN 61937-3:2009 – 2 –
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.

EN 61937-3:2009 contains the following significant technical changes with respect to 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.
__________
---------------------- Page: 4 ----------------------
SIST EN 61937-3:2009
– 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
ETSI TS - Digital Audio Compression (AC-3, Enhanced - -
102 366 AC-3)
ATSC A/52B - Digital Audio Compression (AC-3, E-AC-3), - -
Rev. B
Undated reference.
---------------------- Page: 5 ----------------------
SIST EN 61937-3:2009
---------------------- Page: 6 ----------------------
SIST EN 61937-3:2009
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
ICS 33.160.30 ISBN 2-8318-9360-7
---------------------- Page: 7 ----------------------
SIST EN 61937-3:2009
– 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

---------------------- Page: 8 ----------------------
SIST EN 61937-3:2009
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

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). 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. 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 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 IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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.

---------------------- Page: 9 ----------------------
SIST EN 61937-3:2009
– 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 audio bitstreams applying IEC 60958, can be found on the IEC

website.

The committee has decided that the contents of this publication will remain unchanged until the

maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 10 ----------------------
SIST EN 61937-3:2009
61937-3 © IEC:2007(E) – 5 –
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
1 Scope

This part of IEC 61937 describes the method used to convey non-linear PCM bitstreams

encoded according to the AC-3 and enhanced AC-3 formats.
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 (all parts), Digital audio interface

IEC 61937-1:2007, Digital audio interface for non-linear PCM encoded audio bitstreams

applying IEC 60958 – Part 1: General

IEC 61937-2:2007, Digital audio interface for non-linear PCM encoded audio bitstreams

applying IEC 60958 – Part 2: Burst-info
ATSC Standard A/52B, Digital Audio Compression (AC-3, E-AC-3), Rev. B
ETSI TS 102 366, Digital Audio Compression (AC-3, Enhanced AC-3)
3 Terms and definitions

For the purposes of this standard, the following terms, definitions and abbreviations apply.

3.1 Terms and definitions
3.1.1
latency

delay time of an external audio decoder to decode an AC-3 or enhanced AC-3 data burst,

defined as the sum of two values of the receiving delay time and the decoding delay time.

3.1.2
stream type
an enhanced AC-3 bitstream is constructed from one or more substreams, with each

substream being constructed from a sequence of frames. The stream type parameter of an

enhanced AC-3 frame identifies the type of substream of which the frame is a part

---------------------- Page: 11 ----------------------
SIST EN 61937-3:2009
– 6 – 61937-3 © IEC:2007(E)
3.1.3
substream identification

substream identification parameter of an enhanced AC-3 frame which, in conjunction with the

stream type parameter, identifies the substream in the bitstream of which the enhanced AC-3

frame is a part
3.1.4
converter synchronization flag

flag used for synchronization by a device that converts an enhanced AC-3 bitstream to a

bitstream compliant with an AC-3 decoder and indicates that the first block in this enhanced

AC-3 frame will form the first block of the AC-3 frame output by the conversion process

3.1.5
block identification flag

if the stream type value of an enhanced AC-3 substream is two, indicating that the bitstream

has been converted from an AC-3 bitstream, this bit is set to 1 to indicate that the first block in

this enhanced AC-3 frame was the first block in the original standard AC-3 frame
3.2 Abbreviations
ATSC Advanced Television Standards Committee
ETSI European Telecommunication Standards Institute
IEC International Elect
...

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