1、BRITISH STANDARDBS EN 61937-9:2007Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 9: Non-linear PCM bitstreams according to the MAT formatThe European Standard EN 61937-9:2007 has the status of a British StandardICS 33.160.30; 35.040g49g50g3g38g50g51g60g44
2、g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61937-9:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on
3、 31 December 2007 BSI 2007ISBN 978 0 580 58510 4National forewordThis British Standard is the UK implementation of EN 61937-9:2007. It is identical to IEC 61937-9:2007.The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipm
4、ent.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity f
5、rom legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61937-9 NORME EUROPENNE EUROPISCHE NORM November 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotech
6、nische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61937-9:2007 E ICS 33.160.30; 35.040 English version Digital audio - Interface for non-linear PCM encod
7、ed audio bitstreams applying IEC 60958 - Part 9: Non-linear PCM bitstreams according to the MAT format (IEC 61937-9:2007) Audionumrique - Interface pour les flux de bits audio codage MIC non linaire conformment la CEI 60958 - Partie 9: Flux de bits PCM non linaire conformment au format MAT (CEI 6193
8、7-9:2007) Digitalton - Schnittstelle fr nichtlinear-PCM-codierte Audio-Bitstrme unter Verwendung von IEC 60958 - Teil 9: Nichtlineare PCM-Bitstrme entsprechend MAT-Format (IEC 61937-9:2007) This European Standard was approved by CENELEC on 2007-10-01. CENELEC members are bound to comply with the CEN
9、/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to
10、any CENELEC member. This European Standard exists in two official versions (English and German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions
11、. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Sl
12、ovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61937-9:2007 2 Foreword The text of document 100/1198/CDV, future edition 1 of IEC 61937-9, prepared by technical area 4: Digital system interfaces and protocols of IEC TC 100, Audio, video and multimedia systems and equipment,
13、was submitted to the IEC-CENELEC parallel Unique Acceptance Procedure and was approved by CENELEC as EN 61937-9 on 2007-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)
14、2008-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-10-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61937-9:2007 was approved by CENELEC as a European Standard without any modificatio
15、n. _ 3 EN 61937-9:2007 CONTENTS 1 Scope 4 2 Normative references .4 3 Terms, definitions and abbreviations .4 3.1 Terms and definitions 4 3.2 Abbreviations 4 4 Mapping of the audio bitstream on to IEC 61937-1 4 4.1 General .4 4.2 MAT burst-info.5 5 Format of MAT data-bursts .5 5.1 General .5 5.2 Pau
16、se data-burst .5 5.3 Audio data-bursts 5 5.3.1 The MAT data 5 5.3.2 Latency of the MAT decoder.7 Annex ZA (normative) Normative references to international publications with their corresponding European publications9 Bibliography .8 Figure 1 MAT data-burst 6 Figure 2 Latency of MAT decoding .7 Table
17、 1 Fields of burst-info.5 Table 2 Repetition period of the pause data-bursts .5 Table 3 Data-type-dependent information for MAT 6 Table 4 Sample rate of MAT encoded audio and IEC 60958 frame rate .6 EN 61937-9:2007 4 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60
18、958 Part 9: Non-linear PCM bitstreams according to the MAT format 1 Scope This part of IEC 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, refer
19、enced 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. IEC 60958 (all parts), Digital audio interface IEC 61937-1:2007, Dig
20、ital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 1: 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
21、 following definitions and abbreviations apply. 3.1 Terms and definitions 3.1.1 latencydelay 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 Com
22、mission ISO International Organization for Standardization ISO/IEC MPEG The Moving Picture 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 accordan
23、ce with IEC 61937-1 and 61937-2. 5 EN 61937-9:2007 4.2 MAT burst-info The 16-bit burst-info 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
24、-type 0 21 According to IEC 61937 22 MAT R-MAT 15 360 23 31 According to IEC 61937 5, 6 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, re
25、petition period, the method of filling stream gaps, and decoding latency are specified. 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-
26、burst Pause data-burst for MAT is given in Table 2Table 2 Repetition period of the pause data-bursts Repetition period of pause data-burst Data-type of audio 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
27、 MAT frames. The data-type of a MAT data-burst is 22, and the sub-data-type is 0. When 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 d
28、ata-type values to ensure that the content of the data-burst is correctly identified as 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. EN 61937-9:2007 6 The length of the MAT data-burst
29、will depend on the encoded bit rate (which determines the MAT frame length). R-MATMAT burst-payloadPd Pa Pb Pc Repetition period of the burst StuffingRegular rate of the MAT frames MAT burst-payloadPdPa Pb PcMAT frame R-MATMAT frameIEC 1920/07 Figure 1 MAT data-burst The data-type-dependent informat
30、ion 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 used to deliver MAT data via the IEC 61937 int
31、erface. 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 ha
32、lf-way through the MAT burst-payload. The data-bursts containing MAT frames shall occur at a regular rate, with the reference point of the MAT data-burst beginning 15 360 IEC 60958 frames after the reference point of the preceding MAT data-burst. The units of burst-length shall be in bytes. The maxi
33、mum size of a MAT burst-payload is 61 424 bytes. 7 EN 61937-9:2007 5.3.2 Latency of the MAT decoder The latency of a MAT decoder which receives this signal is specified, with respect to the reference point of the MAT data-burst, to be equal to the time occupied by 1/12 of a MAT frame (equivalent to
34、1 280 IEC 60958 frames at the IEC 60958 frame rate). R-MATMAT burst-payloadPd Pa Pb Pc Latency of the MAT decoderStuffingRegular rate of the MAT frames MAT burst-payloadPdPa Pb PcMAT frame R-MATMAT frameIEC 1921/07 Figure 2 Latency of MAT decoding It is recommended that Pause data-bursts are used to
35、 fill stream gaps in the MAT bitstream as described in IEC 61937-1, and that pause data-bursts be transmitted with a repetition period of 4 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 4 IEC 60958 frames),
36、or to meet the requirement on burst spacing (refer to IEC 61937-1, 6.3.3). When a stream gap in a MAT stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located one frame repetition period following the Pa of the previous MAT frame. It is recommended t
37、hat the sequence(s) of Pause data-bursts which fill the stream gap should continue from this point up to (as close as possible considering the 4 IEC 60958 frame length of the Pause data-burst) the Pa of the first MAT data-burst which follows the stream gap. The gap length parameter contained in the
38、pause data-burst is intended to be interpreted by the MAT decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap). If the sizes of the MAT frames before and after the stream gap are not equal (due to a bitrate change in the interrupted MAT bit
39、stream), this value may differ from the actual number of sampling periods of the audio contained in the stream gap due to the definition of the MAT data-burst reference points. EN 61937-9:2007 8 Bibliography The following document has served as a reference for the specification of the related data-t
40、ype and other parts of IEC 61937. ReferenceTechnical Bulletin Dolby True HD Transmission over the HDMI InterfaceThis document is available under license from Dolby Laboratories Licensing Corporation. Dolby is a registered trademark of Dolby Laboratories. HDMI, the HDMI logo and High-Definition Multi
41、media Interface are trademarks or registered trademarks of HDMI Licensing LLC. _ 9 EN 61937-9:2007 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this d
42、ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. P
43、ublication Year Title EN/HD YearIEC 60958 Series Digital audio interface EN 60958 Series IEC 61937-1 2007 Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Part 1: General EN 61937-1 2007 IEC 61937-2 2007 Digital audio - Interface for non-linear PCM encoded a
44、udio bitstreams applying IEC 60958 - Part 2: Burst-info EN 61937-2 2007 BS EN 61937-9:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the
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