IEC_61937-11-2021.pdf

IEC 61937-11 Edition 2.0 2021-07 INTERNATIONAL STANDARD Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 11:MPEG-4 AAC and its extensions and MPEG-D USAC in LATM/LOAS IEC 61937-11:2021-07(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2021 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,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 either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigendum or an amendment might have been published.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and once a month by email.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.IEC online collection-oc.iec.ch Discover our powerful search engine and read freely all the publications previews.With a subscription you will always have access to up to date content tailored to your needs.Electropedia-www.electropedia.org The worlds leading online dictionary on electrotechnology,containing more than 22 000 terminological entries in English and French,with equivalent terms in 18 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC 61937-11 Edition 2.0 2021-07 INTERNATIONAL STANDARD Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 11:MPEG-4 AAC and its extensions and MPEG-D USAC in LATM/LOAS INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.160.30;33.170 ISBN 978-2-8322-9950-0 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC 61937-11:2021 IEC 2021 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.7 3.1 Terms and definitions.7 3.2 Abbreviated terms.9 4 Mapping of the audio bit stream on to IEC 61937-1.10 4.1 General.10 4.2 Burst-info for MPEG-4 AAC and its extensions and MPEG-D USAC in LATM/LOAS.10 5 Format of data-burst for MPEG-4 AAC and its extensions and MPEG-D USAC in LATM/LOAS.10 5.1 General.10 5.2 Pause data-bursts for MPEG-4 AAC and its extensions in LATM/LOAS.11 5.3 Audio data-bursts.11 5.3.1 MPEG-4 AAC and its extensions in LATM/LOAS.11 5.3.2 USAC in LATM/LOAS.13 5.3.3 LATM/LOAS framing.14 5.3.4 Latency.15 Annex A(informative)Calculation of delay and data-burst repetition rates guidelines.16 A.1 Examples.16 A.2 Guidelines.17 Annex B(normative)High-speed transmission.18 B.1 Indication.18 B.2 Example.18 Annex C(informative)MPEG-4 and MPEG-D audio profiles and audio object types.19 C.1 Overview.19 C.2 MPEG-4 AAC Profile.19 C.3 MPEG-4 High-Efficiency AAC Profile.19 C.4 MPEG-4 High-Efficiency AAC v2 Profile.19 C.5 MPEG-D Baseline USAC Profile.20 C.6 MPEG-D Extended HE-AAC Profile.20 Bibliography.21 Figure 1 Data-burst structure.11 Figure 2 Data-burst structure.13 Figure 3 Latency diagram for burst reception and decoding.15 Figure C.1 MPEG-4/MPEG-D audio profiles structure.19 Table 1 Values for data-type bits 0-4 and data-type bits 5-6.10 Table 2 Repetition period of pause data-bursts.11 Table 3 Data-type-dependent information for MPEG-4 AAC audio and its extensions in LATM/LOAS.12 IEC 61937-11:2021 IEC 2021 3 Table 4 Data-type-dependent information for USAC audio in LATM/LOAS.14 Table A.1 Examples Calculation of delay and data-burst repetition rates for AAC_LC and HE AAC.16 Table A.2 Examples Calculation of delay and data-burst repetition rates for USAC.17 Table B.1 Indication fields.18 Table B.2 Signalling example.18 4 IEC 61937-11:2021 IEC 2021 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 11:MPEG-4 AAC and