1、 IEC 61937-4 Edition 1.0 2003-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 4: Non-linear PCM bitstreams according to the MPEG audio format Audionumrique Interface pour les flux de bits audio codage MIC non
2、linaire conformment la CEI 60958 Partie 4: Flux de bits MIC non linaire selon les formats audio MPEG IEC 61937-4:2003 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2003 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or util
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16、tion ou si vous avez des questions contactez-nous: csciec.ch. IEC 61937-4 Edition 1.0 2003-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 4: Non-linear PCM bitstreams according to the MPEG audio format Audion
17、umrique Interface pour les flux de bits audio codage MIC non linaire conformment la CEI 60958 Partie 4: Flux de bits MIC non linaire selon les formats audio MPEG INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE M ICS 33.160.30 PRICE CODE CODE PRIX ISBN 978-2-83220
18、-528-0 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. Attention! Veuillez vous assurer que vous avez obtenu cette publication via
19、 un distributeur agr. 2 61937-4 IEC:2003 CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 3.1 Definitions . 5 3.2 Abbreviations 5 3.3 Presentation convention 5 4 Mapping of the audio bitstream on to IEC 61937 6 5 Format of MPEG audio data-burst 6 5.1 General .
20、 6 5.2 Pause data-burst . 6 5.3 Audio data-types . 7 5.3.1 MPEG-1 layer-1 . 7 5.3.2 MPEG-1 layer-2 or -3, or MPEG-2 without extension . 7 5.3.3 MPEG-2 with extension . 8 5.3.4 MPEG-2 layer-1 low sampling frequency . 10 5.3.5 MPEG-2 layer-2 Low sampling frequency 11 5.3.6 MPEG-2 layer-3 low sampling
21、frequency . 11 Bibliography 13 Figure 1 MPEG-1 layer-1 data-burst . 7 Figure 2 Data-burst with MPEG-1 layer 2 or 3 or MPEG-2 without extension 8 Figure 3 Latency of MPEG-1 layer 2 or 3 or MPEG-2 without extension . 8 Figure 4 Format of MPEG-base-frame and MPEG-extension-frame 9 Figure 5 MPEG 2 with
22、extension data-burst . 9 Figure 6 Latency of MPEG-2 with extension . 10 Figure 7 MPEG-2 layer-1 low sampling frequency data-burst . 10 Figure 8 MPEG-2 layer-2 low sampling frequency data-burst . 11 Figure 9 MPEG-2 layer-3 low sampling frequency data-burst . 12 Table 1 Fields of burst-info 6 Table 2
23、Repetition period of pause data-bursts 7 Table 3 Data-type-dependent info for data-types 5 and 6 . 9 61937-4 IEC:2003 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 4: Non-linear PCM bitstreams according to th
24、e MPEG audio formats FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerni
25、ng standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this prep
26、aratory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two or
27、ganizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have
28、the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to a
29、pply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to in
30、dicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsibl
31、e for identifying any or all such patent rights. International Standard IEC 61937-4 has been prepared by technical area 4: Digital system interfaces, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This standard cancels and replaces IEC 61937, published in 2000, wh
32、ich has been divided into four parts (see below). This first edition constitutes a technical revision. This bilingual version (2012-12) corresponds to the monolingual English version, published in 2003-05. The text of this standard is based on the following documents: FDIS Report on voting 100/647/F
33、DIS 100/673/RVD Full information on the voting for the approval of this standard can be found in the report 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. 4 6193
34、7-4 IEC:2003 IEC 61937 consists of the following parts under the general title Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958: Part 1: General Part 2: Burst-info Part 3: Non-linear PCM bistreams according to the AC-3 format Part 4: Non-linear PCM bitstreams ac
35、cording to the MPEG audio formats Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theatre Systems) format(s) Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC format Part 7: Non-linear PCM bitstreams according to the ATRAC and ATRAC2/3 formats The committee has decided th
36、at the contents of this publication will remain unchanged until October 2005. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. The contents of the corrigendum of March 2004 have been included in this copy. 61937-4 IEC:2003 5 DIGITAL AUDIO INTER
37、FACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 4: Non-linear PCM bitstreams according to the MPEG audio formats 1 Scope This part of IEC 61937 specifies the method for the digital audio interface specified in IEC 60958 to convey non-linear PCM bitstreams encoded in accordan
38、ce with the MPEG audio. 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 references, the latest edition of the referenced document (including any amendments) applies. IE
39、C 60958 (all parts), Digital audio interface IEC 61937-1, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 1: General 3 Terms and definitions For the purposes of this document, the following definitions, abbreviations and presentation convention apply. 3.1
40、Definitions 3.1.1 latency delay time of an external audio decoder to decode an AC-3 data-burst, defined as the sum of two values of the receiving delay time and the decoding delay time 3.2 Abbreviations 3.2.1 ATSC Advanced Television Systems Committee 3.2.2 MPEG Moving Pictures Expert Group, a joint
41、 committee of ISO and IEC 3.2.3 ITU-R International Telecommunication Union, Radio Communication Bureau 3.3 Presentation convention F872h Value F872 in hexadecimal format 6 61937-4 IEC:2003 4 Mapping of the audio bitstream on to IEC 61937 The coding of the bitstream and data-burst is in accordance w
42、ith IEC 61937-1. The 16-bit burst-info contains information about the data that will be found in the data-burst (see 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-type 0 3 According to IEC 61937 4 MPEG-
43、1 layer-1 data Bit 0 of Pa 384 5 MPEG-1 layer-2 or -3 data, or MPEG-2 without extension Bit 0 of Pa 1 152 6 MPEG-2 data with extension Bit 0 of Pa 1 152 7 MPEG-2 AAC Bit 0 of Pa 1 024 8 MPEG-2 layer-1 low sampling frequency Bit 0 of Pa 768 9 MPEG-2 layer-2 low sampling frequency Bit 0 of Pa 2 304 10
44、 MPEG-2 layer-3 low sampling frequency Bit 0 of Pa 1 152 10 31 According to IEC 61937 5 15 According to IEC 61937 5 Format of MPEG audio data-burst 5.1 General This clause specifies the audio data-burst of MPEG audio. Specific properties such as reference points, repetition period, method of filling
45、 stream gaps and decoding latency are specified. The decoding latency (or delay), indicated for the data-types, should be used by the transmitter to schedule data-bursts as necessary to establish synchronization between picture and decoded audio. 5.2 Pause data-burst Pause data-bursts for MPEG audio
46、 are given in Table 2. 61937-4 IEC:2003 7 Table 2 Repetition period of pause data-bursts Data-type of audio data-burst Repetition period of pause data-burst Mandatory Recommended MPEG-1 layer-1 data 32 IEC 60958 frames MPEG-1 layer-2 or -3 data, or MPEG-2 without extension 32 IEC 60958 frames MPEG-2
47、 data with extension 32 IEC 60958 frames MPEG-2 layer-1 low sampling frequency 64 IEC 60958 frames MPEG-2 layer-2 low sampling frequency 64 IEC 60958 frames MPEG-2 layer-3 low sampling frequency 64 IEC 60958 frames 5.3 Audio data-types 5.3.1 MPEG-1 layer-1 An MPEG-1 layer-1 MPEG-frame represents 384
48、 samples of each encoded channel and can be transferred using data-type 04h. The data-burst is headed with a burst-preamble, followed by the burst-payload. MPEG-1 layer-1 frame Bit 0 of Pa Repetition period of the burst Pa Pd Pc Pb Bit 0 of Pa Stuffing MPEG-1 layer-1 burst_payload Pa Pd Pc Pb IEC 13
49、00/03Figure 1 MPEG-1 Layer-1 data-burst In the case where pause data-bursts are used to fill stream gaps in the MPEG-1 layer-1 bit- stream as described in IEC 61937-1, it is recommended that the pause data-bursts be transmitted with a repetition period of 32 IEC 60958 frames. The total gap length shall be a multiple of 32 IEC 60958 frames. When a stream gap in an MPEG bitstream is fil
