Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 -- Part 8: Non-linear PCM bitstreams according to the Windows Media Audio (WMA) Professional format

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 WMA Professional format.

Digitalton - Schnittstelle für nichtlinear PCM-codierte Audio-Bitströme unter Verwendung von IEC 60958 -- Teil 8: Nichtlineare PCM-Bitströme nach dem Windows-Media-Audio(WMA)-Professional-Format

Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire, conformément à la CEI 60958 -- Partie 8: Flux de bits MIC non linéaire selon le format Windows Media Audio (WMA) Professional

Digitalni avdio – Vmesnik za nelinearne s PCM-kodirane zvokovne bitne tokove po standardu IEC 60958 – 8. del: Nelinearni PCM bitni tokovi v skladu s profesionalnim formatom WMA (IEC 61937-8:2006)

General Information

Status
Published
Publication Date
27-Sep-2007
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Sep-2007
Due Date
24-Nov-2007
Completion Date
28-Sep-2007
Mandate

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SLOVENSKI STANDARD
SIST EN 61937-8:2007
01-november-2007
Digitalni avdio – Vmesnik za nelinearne s PCM-kodirane zvokovne bitne tokove po
standardu IEC 60958 – 8. del: Nelinearni PCM bitni tokovi v skladu s
profesionalnim formatom WMA (IEC 61937-8:2006)

Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC

60958 -- Part 8: Non-linear PCM bitstreams according to the Windows Media Audio
(WMA) Professional format

Digitalton - Schnittstelle für nichtlinear PCM-codierte Audio-Bitströme unter Verwendung

von IEC 60958 -- Teil 8: Nichtlineare PCM-Bitströme nach dem Windows-Media-Audio
(WMA)-Professional-Format

Audionumérique - Interface pour les flux de bits audio à codage MIC non linéaire,

conformément à la CEI 60958 -- Partie 8: Flux de bits MIC non linéaire selon le format

Windows Media Audio (WMA) Professional
Ta slovenski standard je istoveten z: EN 61937-8:2007
ICS:
33.160.30 Avdio sistemi Audio systems
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST EN 61937-8:2007 en,de

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

---------------------- Page: 1 ----------------------
SIST EN 61937-8:2007
---------------------- Page: 2 ----------------------
SIST EN 61937-8:2007
EUROPEAN STANDARD
EN 61937-8
NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM
ICS 35.040
English version
Digital audio -
Interface for non-linear PCM encoded audio bitstreams
applying IEC 60958 -
Part 8: Non-linear PCM bitstreams according
to the Windows Media Audio (WMA) Professional format
(IEC 61937-8:2006)
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 8: Flux de bits MIC non linéaire Teil 8: Nichtlineare PCM-Bitströme
selon le format "Windows Media Audio nach dem Windows-Media-Audio(WMA)-
(WMA) Professional" Professional-Format
(CEI 61937-8:2006) (IEC 61937-8:2006)

This European Standard was approved by CENELEC on 2007-02-01. 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, 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: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61937-8:2007 E
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SIST EN 61937-8:2007
EN 61937-8:2007 - 2 -
Foreword

The text of the International Standard IEC IEC 61937-8:2006, prepared by Technical Area 4, Digital

system interfaces, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to

the formal vote and was approved by CENELEC as EN 61937-8 on 2007-02-01 without any modification.

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) 2008-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC IEC 61937-8:2006 was approved by CENELEC as a European

Standard without any modification.
__________
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SIST EN 61937-8:2007
- 3 - EN 61937-8:2007
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
1) 2)
IEC 61937-1 - Digital audio - Interface for non-linear PCM EN 61937-1 2007
encoded audio bitstreams applying
IEC 60958 -
Part 1: General
1) 2)
IEC 61937-2 - Digital audio - Interface for non-linear PCM EN 61937-2 2003
encoded audio bitstreams applying
IEC 60958 -
Part 2: Burst-info
Undated reference.
Valid edition at date of issue.
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SIST EN 61937-8:2007
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SIST EN 61937-8:2007
INTERNATIONAL IEC
STANDARD 61937-8
First edition
2006-10
Digital Audio –
Interface for non-linear PCM encoded
audio bitstreams applying IEC 60958 –
Part 8:
Non-linear PCM bitstreams according to the
Windows Media Audio (WMA) Professional format
© IEC 2006 ⎯ 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

PRICE CODE
Commission Electrotechnique Internationale M
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
---------------------- Page: 7 ----------------------
SIST EN 61937-8:2007
– 2 – 61937-8 © IEC:2006(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 ..........................................................................................................5

3.3 Presentation convention ..........................................................................................5

4 Mapping of the audio bitstream on to IEC 61937 ..............................................................6

4.1 General ...................................................................................................................6

4.2 Windows Media Audio Professional burst-info .........................................................6

5 Format of WMA Professional data-burst ...........................................................................6

5.1 General ...................................................................................................................6

5.2 Pause data-burst.....................................................................................................7

5.3 Audio data-bursts ....................................................................................................7

Bibliography..........................................................................................................................13

Figure 1 – Windows Media Audio Professional type I data-burst .............................................7

Figure 2 – Latency of WMA Professional type I decoding ........................................................8

Figure 3 – Windows Media Audio Professional type II data-burst ............................................8

Figure 4 – Latency of WMA Professional type II decoding.......................................................9

Figure 5 – Windows Media Audio Professional type III data-burst .........................................10

Figure 6 – Latency of WMA Professional type III decoding....................................................10

Figure 7 – Windows Media Audio Professional type IV data-burst .........................................11

Figure 8 – Latency of WMA Professional type IV decoding....................................................11

Table 1 – Fields of burst-info ..................................................................................................6

Table 2 – Repetition period of Pause data-bursts....................................................................7

Table 3 – Data-type-dependent when data-type = 18 and sub-type = 0 ...................................7

Table 4 – Data-type-dependent when data-type = 18 and sub-type = 1 ...................................9

Table 5 – Data-type-dependent when data-type = 18 and sub-type = 2 .................................10

Table 6 – Data-type-dependent when data-type = 18 and sub-type = 3 .................................11

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SIST EN 61937-8:2007
61937-8 © IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958
Part-8: Non-linear PCM bitstreams according to
the Windows Media Audio (WMA) Professional format
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 61937-8 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:
CDV Report on voting
100/1018A/CDV 100/1095/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.

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SIST EN 61937-8:2007
– 4 – 61937-8 © IEC:2006(E)

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 61937-8:2007
61937-8 © IEC:2006(E) – 5 –
DIGITAL AUDIO –
INTERFACE FOR NON-LINEAR PCM ENCODED
AUDIO BITSTREAMS APPLYING IEC 60958
Part-8: Non-linear PCM bitstreams according to
the Windows Media Audio (WMA) Professional 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 WMA
Professional format.
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, 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-info
3 Terms, definitions and abbreviations

For the purposes of this document, the following terms, definitions, abbreviations and

presentation convention apply.
3.1 Terms and definitions
3.1.1
latency

delay time of an external audio decoder to decode a WMA Professional data burst, defined as

the sum of t
...

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