1、 IEC 61937-12 Edition 1.0 2010-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 12: Non-linear PCM bitstreams according to the DRA formats Audionumrique Interface pour les flux de bits audio codage MIC non lina
2、ire conformment la CEI 60958 Partie 12: Flux de bits MIC non linaire selon les formats DRA IEC 61937-12:2010 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 a
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16、s donner des commentaires 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 61937-12 Edition 1.0 2010-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for no
17、n-linear PCM encoded audio bitstreams applying IEC 60958 Part 12: Non-linear PCM bitstreams according to the DRA formats Audionumrique Interface pour les flux de bits audio codage MIC non linaire conformment la CEI 60958 Partie 12: Flux de bits MIC non linaire selon les formats DRA INTERNATIONAL ELE
18、CTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE N ICS 33.160.30; 33.170 PRICE CODE CODE PRIX ISBN 978-2-88912-146-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61937-12 IEC:2010 CONTENTS FOR
19、EWORD.3 1 Scope.5 2 Normative references .5 3 Terms and definitions .5 3.1 Terms and definitions 5 3.2 Abbreviations 6 3.3 Presentation convention6 4 DRA burst-info6 5 Format of DRA data-bursts.6 5.1 General .6 5.2 Pause data-burst.7 5.3 Audio data-bursts 7 5.3.1 DRA condition .7 5.3.2 DRA half-rate
20、 low sampling frequency condition 9 5.3.3 DRA quarter-rate low sampling frequency condition.11 Bibliography14 Figure 1 DRA data-burst 8 Figure 2 Latency of DRA decoding.9 Figure 3 DRA data-burst half-rate low sampling frequency.10 Figure 4 Latency of DRA decoding half-rate low sampling frequency .11
21、 Figure 5 DRA data-burst quarter-rate low sampling frequency12 Figure 6 Latency of DRA decoding quarter-rate low sampling frequency 13 Table 1 Fields of burst-info 6 Table 2 Data-type-dependent information for data-type DRA7 Table 3 Repetition period of pause data-bursts 7 61937-12 IEC:2010 3 INTERN
22、ATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 12: Non-linear PCM bitstreams according to the DRA formats FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization
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32、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 IEC Publication may be the subject of patent rights. IEC shall not be he
33、ld responsible for identifying any or all such patent rights. International Standard IEC 61937-12 has been prepared by technical area 4: Digital system interfaces and protocols, of IEC technical committee 100: Audio, video and multimedia systems and equipment. This bilingual version, published in 20
34、10-10, corresponds to the English version. The text of this standard is based on the following documents: CDV Report on voting 100/1578/CDV 100/1651/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. 4 61937-12 IEC:
35、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. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “h
36、ttp:/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. 61937-12 IEC:2010 5 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 12: Non-line
37、ar PCM bitstreams according to the DRA formats 1 Scope This part of IEC 61937 specifies the method for IEC 60958 to convey non-linear PCM bitstreams encoded in accordance with the DRA formats. 2 Normative references The following referenced documents are indispensable for the application of this doc
38、ument. For 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 (all parts), Digital audio Interface for non-linear PCM encoded audio bitstr
39、eams applying IEC 60958 IEC 61937-1:2007, Digital audio Interface for non-linear PCM encoded audio bitstreams applying 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 and definitions For the purp
40、oses of this document, the following terms, definitions, abbreviations and presentation conventions apply. 3.1 Terms and definitions 3.1.1 sub data-type type of payload of the data-burst for use with the specified data-type 3.1.2 latency delay time of an external audio decoder to decode a DRA data-b
41、urst NOTE It is defined as the sum of two values of the receiving delay time and the decoding delay time. 3.1.3 length code indicates the length of the data-burst payload in bits or bytes NOTE See Table 3 of IEC 61937-1. 6 61937-12 IEC:2010 3.2 Abbreviations DRA Digital Rise Audio 3.3 Presentation c
42、onvention 01 2 Value “01” in binary format 4 DRA burst-info The general coding method of the bitstream and data-burst is according to IEC 61937-1 and IEC 61937-2. The 16-bit burst-info (Pc) is defined in Table 1. Table 1 Fields of burst-info Bits of Pc Value Contents Reference point R Repetition per
43、iod of data-burst in IEC 60958 frames Data-type 0-22 In accordance with IEC 61937-2 23 DRA or other MPEG applications according to IEC 61937-2, depending on sub data-type 0 4 24-31 In accordance with IEC 61937-2 Subdata-type 00 2 -10 2In accordance with IEC 61937-2 5 6 11 2DRA Bit 0 of Pa Depending
44、on bits 8-9 of Pc 7 In accordance with IEC 61937-1 8 12 data-type-dependent information for data-type DRA 13 15 In accordance with IEC 61937-1 5 Format of DRA data-bursts 5.1 General This clause specifies the audio data-bursts of DRA. Specific properties such as reference points, repetition period,
45、the method of filling stream gaps, and decoding latency are specified for the DRA data-type. 61937-12 IEC:2010 7 The decoding latency (or delay), indicated for the DRA data-type, should be used by the transmitter to schedule data-bursts as necessary to establish synchronization between the video and
46、 the decoded audio. The data-type-dependent information assignment for DRA is given in Table 2. As shown in Table 2, bits 8-9 of Pc are used to identify the relation between the sampling frequencies of DRA and the IEC 60958 frame rate. Table 2 Data-type-dependent information for data-type DRA Bits o
47、f Pc LSB.MSB Value Contents Repetition period of data-burst in IEC 60958 frames 00 2DRA 1 024 01 2DRA half-rate low sampling frequency 2 048 10 2DRA quarter-rate low sampling frequency 4 096 8 9 11 2Reserved - 000 2Reserved, shall be used until further definition 10 12 001 2 111 2Reserved, shall not
48、 be used until further definition 5.2 Pause data-burst The pause data-burst for DRA is given in Table 3. Table 3 Repetition period of pause data-bursts Repetition period of pause data-burst Type of audio data-burst indicated by bits 8-9 of Pc Mandatory Recommended DRA - 32 IEC 60958 frames DRA half-
49、rate low sampling frequency - 64 IEC 60958 frames DRA quarter-rate low sampling frequency - 128 IEC 60958 frames 5.3 Audio data-bursts 5.3.1 DRA condition 5.3.1.1 Data for DRA The streams of the data-bursts of DRA consist of sequences of DRA frames. The data-type and sub-data-type of a DRA data-burst are 23 and 3 respectively with the bits 8-9 of Pc equal t
