1、BRITISH STANDARD BS EN 61937-2:2007Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 2: Burst-infoICS 33.160.30nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull n
2、ullnull nullnullnullnullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnullnull+A1:2011National forewordThis British Standard is the UK implementation of EN 61937-2:2007+A1:2011. It is identical to IEC 61937-2:2007 incorporating amendment 1:2011. It supersedes BS EN 61937-2:2
3、007 which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by !“.The UK participation in its preparation
4、was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment.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 respons
5、ible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 61937-2:2007+A1:2011This British Standard waspublished under the authorityof the Standards Policy andStrategy Committeeon 31 October 2007 The British StandardsInstitution 2012ISBN
6、978 0 580 77040 1Amendments/corrigenda issued since publicationDate Comments 31 January 2012 Implementation of IEC amendment 1:2011 with CENELEC endorsement A1:2011EUROPEAN STANDARD EN 61937-2:2007+A1NORME EUROPENNE EUROPISCHE NORMCENELEC European Committeefor Electrotechnical Standardization Comit
7、Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CentralSecretariat: rue deStassart 35, B - 1050 Brussels 2007 CENELEC -All rights of exploitation in any formand by any means reserved worldwide for CENELEC members.Ref. No. EN 61937-2:2007 EICS 33.160.30 Supe
8、rsedes EN 61937-2:2007English version Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 -Part 2: Burst-info (IEC 61937-2:2007)Audionumrique - Interface pour les flux de bits audio codage MIC non linaire conformment la CEI 60958 - Partie 2: Salve dinformations(C
9、EI 61937-2:2007) Digitalton - Schnittstelle fr nichtlinear-PCM-codierte Audio-Bitstrme unter Verwendung von IEC 60958 - Teil 2: Block-Information (IEC 61937-2:2007) This European Standard was approved by CENELEC on 2007-09-01. CENELEC members are bound to complywith the CEN/CENELEC Internal Regulati
10、ons which stipulate the conditions for giving this European Standardthe status of a national standard without any alteration.Up-to-date lists and bibliographicalreferences concerningsuch national standards maybe obtained on application to the Central Secretariat or to any CENELEC member.This Europea
11、n Standard exists in two official versions (English and German). A version in any other languagemade 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.CENELEC members are the national
12、 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, Slovakia, Slovenia, Spain,Sweden, Swi
13、tzerland and the United Kingdom.December 2011 Foreword The text of document 100/1115/CDV, future edition 2 of IEC 61937-2, prepared by Technical Area 4, ofIEC TC100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELECparallel Unique Acceptance Procedure and was approv
14、ed byCENELEC as EN 61937-2 on 2007-09-01.This European Standard supersedes EN 61937-2:2003.EN 61937-2:2007 contains the following significant technical changes with respect to EN 61937-2:2003: new audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling frequency, MPEG-4 AAC,DTS type IV, ATRA
15、C-X, WMA professional and MAT are added; data-type field in Pc is expanded from bit 0-4 to 0-6.The following dates were fixed: latest date by which the EN has to be implemented at nationallevel by publication of an identicalnational standard or byendorsement (dop) 2008-06-01 latest date by which the
16、 national standards conflicting with the EN have to be withdrawn (dow) 2010-09-01 Annex ZA has been added by CENELEC._ Endorsement notice The text of the International Standard IEC 61937-2:2007 was approved byCENELEC as a EuropeanStandard without any modification._ 2 Foreword to amendment A1 The tex
17、t of document 100/1811/CDV, future edition 2 of IEC 61937-2:2007/A1, prepared by technical area 4, “Digital system interfaces and protocols“, of IEC/TC 100 “Audio, video and multimedia systems and equipment“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61937-2:2007/A1
18、:2011. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-08-28 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 201
19、4-11-28 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61937-2:2007/A1:
20、2011 was approved by CENELEC as a European Standard without any modification. BS EN 61937-2:2007+A1:2011 EN 61937-2:2007+A1:2011 (E)CONTENTS1233.13.244.14.24.34.3.14.3.24.3.34.3.44.3.54.3.64.3.74.3.84.3.9 3 Scope.4Normative references.4Terms, definitionsand abbreviations5Terms and definitions.5Abbre
21、viations 6Burst-info .6General.6Data-type and subdata-type 6Audio data-bursts8General.8AC-38MPEG-1 layer-1.8MPEG-1 layer-2 or -3 or MPEG-2 without extension8MPEG-2 with extension.8MPEG-2 AAC 8MPEG-2 layer-1 low sampling frequency.84.3.18 MPEG-4 AAC 104.3.19 Windows Media Audio professional104.3.20 E
22、nhanced AC-3.104.3.21 MAT10 Table 1 Fields of burst-info 6Table 2 Data-types7MPEG-2 layer-2 low sampling frequency.9MPEG-2 layer-3 low sampling frequency.94.3.10 DTS type I.94.3.11 DTS type II94.3.12 DTS type III.94.3.13 DTS type IV.94.3.14 ATRAC94.3.15 ATRAC 2/394.3.16 ATRAC-X.94.3.17 MPEG-2 AAC lo
23、w samplingfrequency.9Annex ZA (normative) Normative references to international publications with their corresponding European publications114.3.22 MPEG-4 ALS 10 4.3.23 MPEG-4 AAC LC in LATM/LOAS 10 4.3.24 MPEG-4 HE AAC in LATM/LOAS .10 4.3.25 DRA 10 BS EN 61937-2:2007+A1:2011 EN 61937-2:2007+A1:201
24、1 (E)DIGITALAUDIO INTERFACEFOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMSAPPLYING IEC 60958 Part 2: Burst-info 1 Scope This partof IEC 61970 specifiesthe digital audio inter face toconvey non-linear PCM encoded audio bitstreams applying IEC 60958-1and IEC60958-3. This standardspecifies burst-infowhich
25、defines content information about the data contained in the burst payload. 2 Normative referencesThe following referenced documents are indispensable for theapplication of this docu ment.For dated references, only theedition cited applies. For undated references, the latest editionof the referenced
26、document(including any amendments) app lies.IEC 60958-1, Digital audio interface Part 1:GeneralIEC 60958-3, Digital audio interface Part 3:Consumer applicationsIEC 61937-1, Digital audio Interface for non-linear PCM encoded audio bitstreams applyingIEC 60958 Part 1: GeneralIEC 61937-3, Digital audio
27、 Interface for non-linear PCM encoded audio bitstreams applyingIEC 60958 Part 3: Non-linear PCM bitstreams according to the AC-3 formatIEC 61937-4, Digital audio Interface for non-linear PCM encoded audio bit streams applyingIEC 60958 Part 4: Non-linear PCM bitstreams according to the MPEG audio for
28、matsIEC 61937-5, Digital audio Interface for non-linear PCM encoded audio bitstreams applyingIEC 60958 Part 5: Non-linearPCM bitstreams according to the DTS (Digital TheaterSystems) format(s)IEC 61937-6, Digital audio Interface for non-linear PCM encoded audio bitstreams applyingIEC60958 Part 6: Non
29、-linear PCM bitstreams according to the MPEG-2 AAC and MPEG-4AAC formatsIEC 61937-7, Digital audio Interface for non-linear PCM encoded audio bitstreams applyingIEC60958 Part 7: Non-linear PCM bitstreams accordingto theATRAC,ATRAC2/3and ATRAC-X formatsIEC 61937-8, Digital audio Interface for non-lin
30、ear PCM encoded audio bitstreams applyingIEC60958 Part 8: Non-linear PCM bitstreams according tothe Windows Media Audio(WMA) Professional formatIEC 61937-9, Digital audio Interface fornon-linear PCMencoded audio bitstreams applyingIEC 60958 Part 9: Non-linear PCM bitstreams according to the MATforma
31、t 4 IEC 61937-10, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 10: Non-linear PCM bitstreams according to the MPEG-4 audio lossless coding (ALS) format IEC 61937-11, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958
32、Part 11: MPEG-4 AAC and its extensions in LATM/LOAS IEC 61937-12, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 12: Non-linear PCM bitstreams according to the DRA formats !“!“BS EN 61937-2:2007+A1:2011 EN 61937-2:2007+A1:2011 (E)ISO/IEC 11172-3: Informat
33、ion technology Coding of moving pictures and assoc iated audiofordigital storage media atup to about 1,5 Mb/s Part 3: AudioISO/IEC 13818-3, Information technology Generic coding of moving pic turesand associatedaudio information Part 3: AudioISO/IEC 13818-7, Information technology Ge neric coding of
34、 moving pictures and associated audio information Advanced Audio Coding (AAC)ISO/IEC 14496-3, Informationtechnology Coding of audio-visual objects Part 3: Audio ITU-R Recommendation BS.1196, Audio coding for digital terrestrial televisionbroadcasting 3 Terms, definitions and abbreviations 3.1 Terms
35、anddefinitions For thepurpose ofthis document, the following terms and definitions apply. audio data-burst data-burst with an encoded audiofram e as burst-payload audio data-word 16-bit data word audio frame fixed number of audiosamples.The number of samples in an audio frame is dependent on the par
36、ticular encoding systemwhich isused to encode the audio frame into the encoded audio frameaudio gap period in the sequence ofbaseband audio samples where validsamples of audio are not availablebitstreamnon-linear PCM encoded audio source, repre sented in asequence of bits. In this interface the bits
37、tream consists ofa sequence ofdata-burstsdata-burst packet of data, including the burst-preamble, to betransmittedacross the interface burst-payload information content ofthe data-burstburst-preamble header for the data-burst, containing synchronizationand information about the datacontained in the
38、burst-payloaddata-type reference to the type of payload of the data-burstsencoded audio frameminimum decodable unit of an encoded data sequence. Each encoded audio frame is the encoded representation of a fixed numberof audio samples (for each original audio channel). Thenumber of samples which are
39、encoded into an encoded audioframe depends on the particularencoding system whichis used to encode the audio frame intothe encoded audio framelength-codelength of the data-burst-payload in bitsrepetition period period between the reference point of the current data-burst, andthe reference point of t
40、he immediately following data-burst of thesame data-typesampling frequency sampling frequency ofthe encoded PCM audio samples (i.e. beforeencoding and after decoding)sampling period period related to the sampling frequencyofthe PCM audiosamples, represented in the encoded bitstreamstuffing occupying
41、the unused data capacity of the interface stuffing sub-frame occupying the unused data capacity in 16-bit audio data wordsstream gap period within the encoded audio bitstream without any audio frame; adiscontinuity in the bitstream. Typically, a stream gap will occurbetween encoded audio frames 5 BS
42、 EN 61937-2:2007+A1:2011 EN 61937-2:2007+A1:2011 (E)3.2 Abbreviations ATRACAdaptive TRansform Acou stic CodingATRAC2 Adaptive TRansform Acoustic Coding 2ATRAC3 Adaptive TRansform Acoustic Coding 3ATRAC2/3 ATRAC2 and/or ATRAC3 ATRAC-X Adaptive TRansform Ac oustic Coding-XATSC Advanced TelevisionSyste
43、ms Committee IEC International Electrotechnical Commission ISO/IEC MPEGMoving Pictures Expert Group, ajoint committee of ISOand IECITU-R International Telecommunication Union, RadiocommunicationBureauMPEGMotionPicturesExpert Group, a joint committee of ISO and IEC SMPTE Society of Motion Picture and
44、 Television Engineers 4 Burst-info 4.1 General The 16-bit burst-info contains information about the data whichwill be found in the data-burst.Fields ofburst-info is specified in Table 1.Table 1 Fields of burst-info4.2Data-type and subdata-type 6 Bits of Pc Value Contents 0-6 Data-type (defined in IE
45、C 61937-1) 0-4 Conventional data-type 0-31 See Table 2 5-6 Subdata-type 0-3 See Table 2 7 Error-flag 0 Error-flag indicating a valid burst-payload 1 Error-flag indicating that the burst-payload may contain errors 8-12 Data-type-dependent info 13-15 0-7 Bit-stream-number NOTE Refer to IEC 61937-1, 6.
46、1.7 and 6.1.7.1. !“Data-type defined in PC bits 0-6 in IEC 61937-1 consists of conventional data-type (0-4) and subdata-type (5-6) for historical reasons. All conventional data-types and subdata-types are defined in Table 2. Further definition of data-type in the reserved area of Table 2 shall be al
47、located in PC bits 0-6, in ascending order and without skipping gap. “!BS EN 61937-2:2007+A1:2011 EN 61937-2:2007+A1:2011 (E) 7 Table 2 Data-types Data-type Value of Pc bit 0-6 Contents Reference point R Repetition period of data-burst measured in IEC 60958 frames Conventional data-type Value of Pc
48、bit 0-4 Subdata-type Value of Pc bit 5-6 0 0 Null data See Note 1 1 0 AC-3 data R-AC-3 1 536 2 0 3 Refer to SMPTE 338M 3 0 Pause bit 0 of Pa See Note 2 4 0 MPEG-1 layer 1 data bit 0 of Pa 384 5 0 MPEG-1 layer 2 or 3 data or MPEG-2 without extension bit 0 of Pa 1 152 6 0 MPEG-2 data with extension bi
49、t 0 of Pa 1 152 7 0 MPEG-2 AAC bit 0 of Pa 1 024 8 0 MPEG-2, layer-1 low sampling frequency bit 0 of Pa 768 9 0 MPEG-2, layer-2 low sampling frequency bit 0 of Pa 2 304 10 0 MPEG-2, layer-3 low sampling frequency bit 0 of Pa 1 152 11 0 DTS type I bit 0 of Pa 512 12 0 DTS type II bit 0 of Pa 1 024 13 0 DTS type III bit 0 of Pa 2 048 14 0 ATRAC bit 0 of Pa 512 15 0 ATRAC 2/3 bit 0 of Pa 1 024 16 0 ATRAC-X bit 0 of Pa 2 048 17 0 DTS type IV bit 0 of Pa See IE
