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1、 Reference number ISO/IEC 14496-3:2005/Amd.1:2007(E) ISO/IEC 2007 INTERNATIONAL STANDARD ISO/IEC 14496-3 Third edition 2005-12-01 AMENDMENT 1 2007-03-01 Information technology Coding of audio-visual objects Part 3: Audio AMENDMENT 1: Low delay AAC profile Technologies de linformation Codage des obje
2、ts audiovisuels Partie 3: Codage audio AMENDEMENT 1: Profil de retard faible AAC ISO/IEC 14496-3:2005/Amd.1:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces
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5、ent that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO/IEC 2007 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 photo
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7、zerland ii ISO/IEC 2007 All rights reserved -,-,- ISO/IEC 14496-3:2005/Amd.1:2007(E) ISO/IEC 2007 All rights reserved iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardizatio
8、n. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual i
9、nterest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance w
10、ith the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard r
11、equires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Amendment 1 to ISO/I
12、EC 14496-3:2005 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. -,-,- -,-,- ISO/IEC 14496-3:2005/Amd.1:2007(E) ISO/IEC 2007 All rights reserved 1 Information technology Coding of aud
13、io-visual objects Part 3: Audio AMENDMENT 1: Low delay AAC profile In subclause 1.5.2.1 (Profiles), add: X. The Low Delay AAC Profile contains the audio object type 23 (ER AAC LD). where X shall be adjusted to be the increment of the highest available number. In Table 1.3 (Audio Profiles Definition)
14、, add a column with the term “Low Delay AAC Profile” in the first column, and an “X” in the column with the Object Type ID 23. In subclause 1.5.2.3 (Levels within the profiles), add: Levels for Low Delay AAC Profile The following level is specified: Table 1.11.A Level for the Low Delay AAC Profile L
15、evel Max. channels/object Max. sampling rate kHz epConfig 1 2 48 0 LTP is not permitted. Pulse data is not permitted. In subclause 1.5.2.4 (audioProfileLevelIndication), Table 1.12 (audioProfileLevelIndication values), replace: 0x34 0x7F reserved for ISO use - with: 0x34 Low Delay AAC Profile L1 0x35 0x7F reserved for ISO use - ISO/IEC 14496-3:2005/Amd.1:2007(E) ICS 35.040 Price based on 1 page ISO/IEC 2007 All rights reserved -,-,-