1、 IEC 61937-7 Edition 2.0 2004-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying to IEC 60958 Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats Audionumrique Interface pour les flux de bits
2、audio codage MIC non linaire conformment la CEI 60958 Partie 7: Flux de bits MIC non linaire selon les formats ATRAC, ATRAC2/3 et ATRAC-X IEC 61937-7:2004 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2004 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this
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16、er des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61937-7 Edition 2.0 2004-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying to IEC 60958 Part 7: Non-linear PCM bitstreams a
17、ccording to the ATRAC, ATRAC2/3 and ATRAC-X formats Audionumrique Interface pour les flux de bits audio codage MIC non linaire conformment la CEI 60958 Partie 7: Flux de bits MIC non linaire selon les formats ATRAC, ATRAC2/3 et ATRAC-X INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECH
18、NIQUE INTERNATIONALE M ICS 33.160.01 PRICE CODE CODE PRIX ISBN 978-2-83220-524-2 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. A
19、ttention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61937-7 IEC:2004 CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 Terms, definitions and abbreviations 5 3.1 Definitions . 5 3.2 Abbreviations 5 4 Mapping of the audio bitstream on to IEC
20、61937 6 4.1 General . 6 4.2 ATRAC, ATRAC2/3 and ATRAC-X burst-info . 6 5 Format of ATRAC, ATRAC2/3 and ATRAC-X data-bursts . 6 5.1 General . 6 5.2 Audio data-bursts 7 5.2.1 The data ATRAC . 7 5.2.2 Latency of ATRAC decoding 8 5.2.3 The data ATRAC2/3 8 5.2.4 Latency of ATRAC2/3 decoding . 9 5.2.5 The
21、 data ATRAC-X 10 5.2.6 Latency of ATRAC-X decoding 11 Bibliography 13 Figure 1 ATRAC data-burst 7 Figure 2 Latency of ATRAC decoding 8 Figure 3 ATRAC2/3 data-burst . 9 Figure 4 Latency of ATRAC2/3 decoding 10 Figure 5 ATRAC-X data-burst 10 Figure 6 Latency of ATRAC-X decoding . 11 Table 1 Fields of
22、burst-info 6 Table 2 Data-type-dependent information for data-type ATRAC . 7 Table 3 Data-type-dependent information for data-type ATRAC2/3 9 Table 4 Data-type-dependent information for data-type ATRAC-X 11 61937-7 IEC:2004 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE FOR NO
23、N-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical com
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32、d 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
33、) 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 61937-7 has been prepared by Technical Area 4: Digital system int
34、erfaces and protocols, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This second edition cancels and replaces the first edition published in 2002. This edition constitutes a technical revision. This edition includes the following significant technical changes wit
35、h respect to the previous edition: a) In this edition, a new audio data-type of ATRAC-X is added to ATRAC and ATRAC2/3. b) Specific properties such as reference points, repetition period, the method of filling stream gaps, and decoding latency are specified for data-type of ATRAC-X. 4 61937-7 IEC:20
36、04 This bilingual version (2012-12) corresponds to the monolingual English version, published in 2004-11. The text of this standard is based on the following documents: CDV Report on voting 100/752/CDV 100/834/RVC Full information on the voting for the approval of this standard can be found in the r
37、eport on voting indicated in the above table. 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. IEC 61937 consists of the following parts, undert the general title Digital audio Interface for non-linear P
38、CM encoded audio bitstreams applying IEC 60958: Part 1: General Part 2: Burst-info Part 3: Non-linear PCM bitstreams according to the AC-3 format Part 4: Non-linear PCM bitstreams according to the MPEG audio formats Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater Systems) for
39、mat(s) Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC format Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats (TA4) Part 8: Non-linear PCM bitstreams according to the Windows Media Audio Professional (TA4) 1The committee has decided that the conte
40、nts 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. 1Under
41、 consideration. 61937-7 IEC:2004 5 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats 1 Scope This part of IEC 61937 specifies the method for the digital audio interface specifi
42、ed in IEC 60958 to convey non-linear PCM bitstreams encoded in accordance with the ATRAC, ATRAC2/3 and ATRAC-X formats. 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
43、references, the latest edition of the referenced document (including any amendments) applies. IEC 60958-1, Digital audio interface Part 1: General IEC 60958-3, Digital audio interface Part 3: Consumer applications IEC 61937-1, Digital audio Interface for non-linear PCM encoded audio bitstreams apply
44、ing 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 3.1 Definitions For the purposes of this document, the definitions given in IEC 61937-1 and IEC 61937-2, as well
45、 as the following, apply. 3.1.1 latency delay time of an external audio decoder to decode an ATRAC, ATRAC2/3 and ATRAC-X data- burst, defined as the sum of two values of the receiving delay time and the decoding delay time 3.2 Abbreviations ATRAC Adaptive TRansform Acoustic Coding ATRAC2 Adaptive TR
46、ansform Acoustic Coding 2 ATRAC3 Adaptive TRansform Acoustic Coding 3 ATRAC2/3 ATRAC2 and/or ATRAC3 ATRAC-X Adaptive TRansform Acoustic Coding-X 6 61937-7 IEC:2004 4 Mapping of the audio bitstream on to IEC 61937 4.1 General The coding of the bitstream and data-burst shall be in accordance with IEC
47、61937-1 and IEC 61937-2. 4.2 ATRAC, ATRAC2/3 and ATRAC-X burst-info This 16-bit burst-info shall contain data-burst information structured in accordance with Table 1. Table 1 Fields of burst-info Bits of Pc Value Contents Reference point R Repetition period of data-burst in IEC 60958 frames 0-4 data
48、type 0-13 in accordance with IEC 61937-1 and IEC 61937-2 14 ATRAC bit 0 of Pa 512 15 ATRAC2/3 bit 0 of Pa 1 024 16 ATRAC-X Sub-data-type dependent Sub-data-type dependent 17-31 in accordance with IEC 61937-2 5, 6 00 2 Reserved in ATRAC and ATRAC2/3 formats 00 2 Sub-data-type for ATRAC-X bit 0 of Pa
49、 2 048 01 2, 10 2, 11 2 Reserved for sub-data-type in ATRAC-X 7-15 in accordance with IEC 61937-1 and IEC 61937-2 5 Format of ATRAC, ATRAC2/3 and ATRAC-X data-bursts 5.1 General This clause specifies the audio data-bursts ATRAC, ATRAC2/3 and ATRAC-X. Specific properties such as reference points, repetition period, the method of filling stream gaps, and decoding latency are specified for
