EN 61937-3:2003

SLOVENSKI STANDARD
01-september-2004
Digitalni avdio-vmesnik za nelinearne PCM-kodirane avdio bitne tokove po IEC
60958 - 3. del: Nelinearni PCM bitni tokovi glede na format AC-3 (IEC 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
Digitalton - Schnittstelle für nichtlinear-PCM-codierte Audio-Bitströme unter Verwendung
von IEC 60958 -- Teil 3: Nichtlineare PCM-Bitströme nach dem 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 PCM non-linéaire selon le format
AC-3
Ta slovenski standard je istoveten z: EN 61937-3:2003
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
EUROPÄISCHE NORM October 2003

ICS 33.160.30
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 format
(IEC 61937-3:2003)
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 PCM non-linéaire Teil 3: Nichtlineare PCM-Bitströme
selon le format AC-3 nach dem AC-3 Format
(CEI 61937-3:2003) (IEC 61937-3:2003)

This European Standard was approved by CENELEC on 2003-10-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and 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

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61937-3:2003 E
Foreword
The text of document 100/646/FDIS, future edition 1 of IEC 61937-3, prepared by 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 2003-10-01.

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) 2004-07-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-10-01

Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61937-3:2003 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 61937-2 NOTE Harmonized as EN 61937-2:2003 (not modified).
__________
- 3 - «Field32»
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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

1) 2)
IEC 61937-1 - Digital audio - Interface for non-linear EN 61937-1 2003
PCM encoded audio bitstreams applying
IEC 60958
Part 1: General
1)
ITU-R - Audio coding for digital terrestrial - -
Recommendation television broadcasting
BS.1196-1
1)
ATSC A/52 - Digital Audio Compression (AC-3) - -
Standard
1)
Undated reference.
2)
Valid edtion at date of issue.

INTERNATIONAL IEC
STANDARD 61937-3
First edition
2003-05
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
© IEC 2003 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
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–  – 61937-3 © IEC:2003(E)
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
3.1 Definitions . 5
3.2 Abbreviations. 5
3.3 Presentation convention . 6
4 Mapping of the audio bitstream on to IEC 61937. 6
4.1 AC-3 burst-info . 6
5 Format of AC-3 data-burst . 6
5.1 General . 6
5.2 Pause data-burst . 6
5.3 Audio data-bursts . 6
5.3.1 The data AC-3 . 6
5.3.2 Latency of AC-3 decoding . 7
Bibliography. 9
Figure 1 – AC-3 data-burst, with reference point R. 7
Figure 2 – Latency of AC-3 decoding . 8
Table 1 – Fields of burst-info.6
Table 2 – Repetition period of pause data-bursts . 6
Table 3 – Data-type-dependent when data-type = 1 . 7

61937-3 © IEC:2003(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 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
St
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