1、 IEC 61937-9 Edition 1.0 2007-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 9: Non-linear PCM bitstreams according to the MAT format Audionumrique Interface pour les flux de bits audio codage MIC non linaire
2、 conformment la CEI 60958 Partie 9: Flux de bits MIC non linaire selon le format MAT IEC 61937-9:2007 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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16、avez des questions contactez-nous: csciec.ch. IEC 61937-9 Edition 1.0 2007-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 9: Non-linear PCM bitstreams according to the MAT format Audionumrique Interface pour
17、les flux de bits audio codage MIC non linaire conformment la CEI 60958 Partie 9: Flux de bits MIC non linaire selon le format MAT INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE J ICS 33.160.30; 35.040 PRICE CODE CODE PRIX ISBN 978-2-83220-523-5 Registered tradem
18、ark 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 un distributeur agr. 2
19、61937-9 IEC:2007 CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 Terms, definitions and abbreviations 5 3.1 Terms and definitions 5 3.2 Abbreviations 5 4 Mapping of the audio bitstream on to IEC 61937-1 . 5 4.1 General . 5 4.2 MAT burst-info. 6 5 Format of MAT data-bursts . 6 5.1 Gene
20、ral . 6 5.2 Pause data-burst . 6 5.3 Audio data-bursts 6 5.3.1 The MAT data 6 5.3.2 Latency of the MAT decoder 8 Bibliography 9 Figure 1 MAT data-burst 7 Figure 2 Latency of MAT decoding . 8 Table 1 Fields of burst-info 6 Table 2 Repetition period of the pause data-bursts 6 Table 3 Data-type-depende
21、nt information for MAT . 7 Table 4 Sample rate of MAT encoded audio and IEC 60958 frame rate 7 61937-9 IEC:2007 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 9: Non-linear PCM bitstreams according to the MAT
22、format FOREWORD 1) The International Electrotechnical 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
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30、al Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is
31、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 IEC Publication may be the subject of patent rights. IEC shall
32、not be held responsible for identifying any or all such patent rights. International Standard IEC 61937-9 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 (2012-12
33、) corresponds to the monolingual English version, published in 2007-08. The text of this standard is based on the following documents: FDIS Report on voting 100/1198/FDIS 100/1265/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in t
34、he above table. 4 61937-9 IEC:2007 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 list of all parts of the IEC 61937 series, under the general title Digital audio Interface for non-linear PCM encod
35、ed 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 maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication
36、 At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61937-9 IEC:2007 5 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 9: Non-linear PCM bitstreams according to the MAT format 1 Scope This part of IEC
37、61937 describes the method to convey non-linear PCM bitstreams encoded according to the MAT format. 2 Normative references The following Standards contain provisions which, through reference in the text, referenced documents are indispensable for the application of this document. For dated reference
38、s, 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 61937-1:2007, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 1:
39、 General IEC 61937-2:2007, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 2: Burst info 3 Terms, definitions and abbreviations For the purpose of this standard, the following definitions and abbreviations apply. 3.1 Terms and definitions 3.1.1 latency del
40、ay time of an external audio decoder to decode a MAT data-burst, defined as the sum of two values of the receiving delay time and the decoding delay time 3.2 Abbreviations IEC International Electrotechnical Commission ISO International Organization for Standardization ISO/IEC MPEG The Moving Picture
41、 Experts Group, a joint committee of ISO and IEC MAT Metadata-enhanced Audio Transmission 4 Mapping of the audio bitstream on to IEC 61937-1 4.1 General The coding of the bitstream and data-burst is in accordance with IEC 61937-1 and 61937-2. 6 61937-9 IEC:2007 4.2 MAT burst-info The 16-bit burst-in
42、fo contains information about the data which will be found in the data-burst. 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 21 According to IEC 61937 22 MAT R-MAT 15 360 23 31 According to IEC 61937 5, 6
43、Sub- data-type 0 MAT 1 3 According to IEC 61937 7 15 According to IEC 61937 5 Format of MAT data-bursts 5.1 General This clause specifies the audio data-burst MAT. Specific properties such as reference points, repetition period, the method of filling stream gaps, and decoding latency are specified.
44、The decoding latency (or delay), indicated for the data-type, 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-burst for MAT is given in Table 2 Table 2 Repetition period of the paus
45、e data-bursts Data-type of audio data-burst Repetition period of pause data-burst Mandatory Recommended MAT - 4 IEC 60958 frames 5.3 Audio data-bursts 5.3.1 The MAT data The MAT bitstream consists of a sequence of MAT frames. The data-type of a MAT data-burst is 22, and the sub-data-type is 0. When
46、MAT data is being transmitted, the transmission device shall ensure that both the data-type and sub-data-type values are set correctly. Additionally, the receiving device shall utilize both the data-type and sub data-type values to ensure that the content of the data-burst is correctly identified as
47、 MAT. The data-burst is headed with a burst-preamble, followed by the burst-payload. The burst-payload of each MAT data-burst shall contain 1 complete MAT frame. 61937-9 IEC:2007 7 The length of the MAT data-burst will depend on the encoded bit rate (which determines the MAT frame length). Figure 1
48、MAT data-burst The data-type-dependent information for MAT is given in Table 3. Table 3 Data-type-dependent information for MAT Bits of Pc LSBMSB Value Contents 8 - 12 00h Reserved, shall be set to 0 Table 4 shows the relation between the sample rate of MAT encoded audio and the IEC 60958 frame rate
49、 used to deliver MAT data via the IEC 61937 interface. Table 4 Sample rate of MAT encoded audio and IEC 60958 frame rate MAT sample rate IEC 60958 frame rate 48 kHz 768 kHz 96 kHz 768 kHz 192 kHz 768 kHz 44,1 kHz 705,6 kHz 88,2 kHz 705,6 kHz 176,4 kHz 705,6 kHz The reference point of a MAT data-burst (R-MAT) is the IEC 60958 frame that occurs half-way through the MAT burst-payload.
