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INTERNATIONAL
STANDARD
IEC
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
Reference number
IEC 61937-8:2006(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to
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and date of publication. On-line information is also available on recently issued
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please contact the Customer Service Centre:
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INTERNATIONAL
STANDARD
IEC
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
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Commission Electrotechnique Internationale
International Electrotechnical Commission
Межд
у
на
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однаяЭлект
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отехническаяКомиссия
– 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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