1、 IEC 61937-11 Edition 1.0 2010-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 11: MPEG-4 AAC and its extensions in LATM/LOAS Audionumrique Interface pour les flux de bits audio codage MIC non linaire conformm
2、ent la CEI 60958 Partie 11: MPEG-4 AAC et ses extensions en LATM/LOAS IEC 61937-11:2010 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 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 mea
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16、ires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61937-11 Edition 1.0 2010-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded
17、audio bitstreams applying IEC 60958 Part 11: MPEG-4 AAC and its extensions in LATM/LOAS Audionumrique Interface pour les flux de bits audio codage MIC non linaire conformment la CEI 60958 Partie 11: MPEG-4 AAC et ses extensions en LATM/LOAS INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTR
18、OTECHNIQUE INTERNATIONALE P ICS 33.160.30; 33.170 PRICE CODE CODE PRIX ISBN 978-2-88912-321-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61937-11 IEC:2010 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 N
19、ormative references . 6 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions 6 3.2 Abbreviations 8 4 Mapping of the audio bit stream on to IEC 61937-1 8 4.1 General . 8 4.2 Burst-info for MPEG-4 AAC and its extensions in LATM/LOAS 8 5 Format of data-burst for MPEG-4 AAC and its extensi
20、ons in LATM/LOAS . 9 5.1 General . 9 5.2 Pause data-bursts for MPEG-4 AAC and its extensions in LATM/LOAS . 9 5.3 Audio data-bursts 10 5.3.1 MPEG-4 AAC and its extensions in LATM/LOAS 10 5.3.2 LATM/LOAS framing 12 5.3.3 Latency . 12 Annex A (informative) Calculation of delay and data-burst repetitio
21、n rates guidelines . 14 Bibliography 16 Figure 1 Data-burst structure . 10 Figure 2 Latency diagram for burst reception and decoding . 13 Table 1 Values for data-type and sub-data-type . 9 Table 2 Repetition period of pause data-bursts 9 Table 3 Data-type-dependent information 11 Table A.1 Examples
22、Calculation of delay and data-burst repetition rates . 14 61937-11 IEC:2010 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 11: MPEG-4 AAC and its extensions in LATM/LOAS FOREWORD 1) The International Electrote
23、chnical 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 t
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32、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
33、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 61937-11 has been prepared by technical area 4: Digital system interfaces and protocols, of IEC technical committee 100: Audio, video and m
34、ultimedia systems and equipment. This bilingual version, published in 2011-02, corresponds to the English version. The text of this standard is based on the following documents: CDV Report on voting 100/1491/CDV 100/1580/RVC Full information on the voting for the approval of this standard can be fou
35、nd in the report on voting indicated in the above table. 4 61937-11 IEC:2010 The French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 61937, under the general title Digital audio Inter
36、face 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 stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the s
37、pecific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61937-11 IEC:2010 5 INTRODUCTION Modern digital video broadcasting standards such as DVB include support for the MPEG-4 HE AAC and/or HE AAC v2 audio codecs as specified in I
38、SO/IEC 14496-3. An increasing number of countries are adopting these new codecs for their standard definition and high definition digital video broadcasting services and have started with implementations. For MPEG-2 AAC audio (ISO/IEC 13818-7) the specified framing format for the audio bit stream is
39、 ADTS and its transport over an IEC 60958 interface is specified in IEC 61937-6. However, the MPEG-4 (ISO/IEC 14496-3) audio codecs introduce new features and capabilities that require a framing format that supports more flexible signaling and delivery mechanisms. Therefore, MPEG-2 Systems (ISO/IEC
40、13818-1) specifies the MPEG-4 LATM/LOAS framing format for MPEG-4 audio codecs to overcome the limitations of ADTS. In order to be able to pass the MPEG-4 audio bit stream from a Set Top Box to an A/V receiver connected via the IEC 60958 interface without needing to reframe the audio bit stream with
41、in ADTS, the MPEG-4 LATM/LOAS framing format needs to be supported by IEC 61937. 6 61937-11 IEC:2010 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 11: MPEG-4 AAC and its extensions in LATM/LOAS 1 Scope This part of IEC 61937 describes the method to conve
42、y non-linear PCM bitstreams encoded according to the MPEG-4 AAC format and its extensions spectral band replication, parametric stereo and MPEG surround, framed in MPEG-4 LATM/LOAS. 2 Normative references The following referenced documents are indispensable for the application of this document. For
43、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 609
44、58 Part 1: General IEC 61937-2, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 2: Burst-info ISO/IEC 14496-3:2009, Information technology Coding of audio-visual objects Part 3: Audio 3 Terms, definitions and abbreviations For the purposes of this document
45、 the terms, definitions and abbreviations of IEC 61937-1, IEC 61937-2 and the following apply. 3.1 Terms and definitions 3.1.1 access unit smallest entity to which timing information can be attributed; an access unit is the smallest individually decodable unit; a decoder consumes access units 3.1.2
46、AudioMuxElement(1) LATM element that carries payload data for at least one audio elementary stream, related payload length information and multiplex configuration information NOTE This element carries payload data in form of PayloadMux elements. The number in brackets indicates multiplexing configur
47、ation (StreamMuxConfig) is multiplexed into AudioMuxElements, that is in-band transmission. 3.1.3 AudioSpecificConfig configuration structure used to convey parameters to initialize the MPEG-4 audio decoder 61937-11 IEC:2010 7 3.1.4 low overhead MPEG-4 audio transport multiplex LATM multiplexing lay
48、er defined by ISO/IEC 14496-3; used for multiplexing of audio elementary streams 3.1.5 low overhead audio stream LOAS synchronisation layer defined by ISO/IEC 14496-3; three different formats of LOAS are defined, each of which is designed to address the specific characteristics of the underlying tra
49、nsmission layer 3.1.6 MPEG-4 AAC profile contains only the MPEG-4 AAC low complexity audio object type; MPEG-4 AAC low complexity object type is the counterpart to the MPEG-2 AAC low complexity profile; in addition to the MPEG-2 AAC LC profile the MPEG-4 AAC low complexity object type enables the usage of the PNS tool NOTE The MPEG-4 AAC Low Complexity object type is used when there
