1、BSI Standards PublicationConsumer audio/video equipment Digital interfacePart 6: Audio and music data transmission protocolBS EN 61883-6:2014National forewordThis British Standard is the UK implementation of EN 61883-6:2014. It is identical to IEC 61883-6:2014. It supersedes BS EN 61883-6:2005 which
2、 is withdrawn.The UK participation in its preparation was entrusted to Technical Com-mittee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the
3、 necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 79867 2ICS 33.160.01; 35.200Compliance with a British Standard cannot confer immunity fromlegal obligations.This British
4、 Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61883-6:2014EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 61883-6 October 2014 ICS 33.160.01; 35.200
5、 Supersedes EN 61883-6:2005 English Version Consumer audio/video equipment - Digital interface - Part 6: Audio and music data transmission protocol (IEC 61883-6:2014) Matriel audio/vido grand public - Interface numrique - Partie 6: Protocole de transmission de donnes audio et musicales (CEI 61883-6:
6、2014) Audio-Video-Gerte der Unterhaltungselektronik - DigitaleSchnittstelle - Teil 6: bertragungsprotokoll fr Ton- und Musikdaten (IEC 61883-6:2014) This European Standard was approved by CENELEC on 2014-10-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
7、late 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 CEN-CENELEC Management Centre or to any CENELEC member. This Europea
8、n Standard exists in three official versions (English, French, 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 CEN-CENELEC Management Centre has the same status as the official versions.CENELEC member
9、s are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,Lithuania, Luxembourg, Malta, the Netherlands, Norway
10、, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Ma
11、rnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61883-6:2014 E EN 61883-6:2014 - 2 - Foreword The text of document 100/2341/FDIS, future edition 3 of IEC 61883-6, prepared by Technical Area 4 “Digital s
12、ystem 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 61883-6:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by pub
13、lication of an identical national standard or by endorsement (dop) 2015-07-08 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-10-08 This document supersedes EN 61883-6:2005. Attention is drawn to the possibility that some of the elements of t
14、his 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 61883-6:2014 was approved by CENELEC as a European Standard without any modification. In the
15、 official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60958-4 NOTE Harmonized as EN 60958-4. IEC 61883-6:2002 NOTE Harmonized as EN 61883-6:2002 (not modified). BS EN 61883-6:2014- 3 - EN 61883-6:2014 Annex ZA (normative) Normative references to i
16、nternational publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest editi
17、on of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
18、 available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60958 Series Digital audio interface EN 60958 Series IEC 60958-3 - Digital audio interface - Part 3: Consumer applications EN 60958-3 - IEC 61883-1 - Consumer audio/video equipment - Digital interface - Part 1: General EN 61883-1
19、- IEEE 754 1985 1)IEEE Standard for Binary Floating-Point Arithmetic - - IEEE 1394 - IEEE Standard for a High-Performance Serial Bus - - IEEE 1394a - Standard for a High Performance Serial Bus - Amendment 1 - - 1)Superseded by IEEE 754:2008. BS EN 61883-6:2014 2 IEC 61883-6:2014 IEC 2014 CONTENTS 1
20、Scope 13 2 Normative references 13 3 Terms, definitions and abbreviations . 13 3.1 Terms and definitions 13 3.2 Abbreviations 15 4 Reference model for data transmission 16 4.1 General . 16 4.2 Application layer . 17 4.3 Adaptation layer 17 4.4 Packetization layer 18 5 Transport requirements . 19 5.1
21、 Arbitrated short bus reset 19 5.2 Bit, byte, and quadlet ordering 19 6 Packet header for audio and music data 19 6.1 General . 19 6.2 Isochronous packet header format 19 6.3 CIP header format 19 7 Packetization . 20 7.1 Packet transmission method . 20 7.2 Transmission of timing information 20 7.3 T
22、ime stamp processing . 21 7.4 Transmission control . 21 7.4.1 Non-blocking transmission method 21 7.4.2 Blocking transmission method . 23 8 Event types . 24 8.1 General . 24 8.2 AM824 data 27 8.2.1 Generic format . 27 8.2.2 IEC 60958 conformant data . 29 8.2.3 Multi-bit linear audio (MBLA) . 29 8.2.
23、4 One-bit audio . 30 8.2.5 MIDI conformant data 31 8.2.6 SMPTE time code data 32 8.2.7 Sample count data . 32 8.2.8 High-precision multi-bit linear audio . 32 8.2.9 Ancillary data . 33 8.2.10 Application specific ancillary data 35 8.3 32-bit floating-point data . 35 8.4 24-bit 4 audio pack 36 8.5 32
24、-bit generic data 36 9 FDF definition 36 9.1 Overview 36 9.2 Basic format 37 9.3 Special format . 39 BS EN 61883-6:2014IEC 61883-6:2014 IEC 2014 3 10 FDF definition for AM824 data . 39 10.1 Definition of N-flag 39 10.2 Supplementary SFC definition . 39 10.3 Clock-based rate control mode (FDF = 0000
25、0xxx2) 40 10.3.1 Introductory remark . 40 10.3.2 Default SFC table for (FDF = 0000 0xxx2) . 40 10.4 Command-based rate control mode (FDF = 00001xxx2) 41 10.4.1 Introductory remark . 41 10.4.2 Default SFC table for (FDF = 0000 1xxx2) . 42 11 AM824 adaptation process 42 11.1 Introductory remark . 42 1
26、1.2 Basic sequence conversion . 42 11.3 Sequence multiplexing 43 11.4 Compound data block structure . 43 11.4.1 General . 43 11.4.2 Compound data structure rule 44 12 AM824 sequence adaptation layers . 47 12.1 Overview 47 12.1.1 General . 47 12.1.2 IEC 60958 bitstream 47 12.1.3 One-bit audio . 53 12
27、.1.4 Non-linear audio data stream . 56 12.1.5 MIDI data stream . 56 12.1.6 SMPTE time code and sample count . 57 12.1.7 High-precision and double-precision multi-bit linear audio . 57 12.2 DVD-audio 62 12.2.1 General . 62 12.2.2 DVD-Audio specific ancillary data 62 12.2.3 Data for CCI 64 12.2.4 Data
28、 for ISRC 64 12.2.5 Example of DVD-Audio stream 64 12.3 SACD definition 66 12.3.1 General . 66 12.3.2 SACD ancillary data 66 12.3.3 SACD supplementary data . 67 12.3.4 Multi-bit linear audio data 68 12.3.5 SACD Track_Mode SYT_INTERVAL denotes the number of data blocks between two successive valid SY
29、Ts, which includes one of the data blocks with a valid SYT. For example, if BS EN 61883-6:2014IEC 61883-6:2014 IEC 2014 21 there are three data blocks between two valid SYTs, then the SYT_INTERVAL would be 4. The receiver can derive the index value from the DBC field of a CIP with a valid SYT using
30、the following formula: index = mod(SYT_INTERVAL mod(DBC, SYT_INTERVAL), SYT_INTERVAL (2) where index is the sequence number; SYT_INTERVAL denotes the number of data blocks between two successive valid SYTs, which includes one of the data blocks with a valid SYT; DBC is the data block count field of
31、a CIP. The receiver is responsible for estimating the timing of data blocks between valid time stamps. The method of timing estimation is implementation-dependent. 7.3 Time stamp processing A data block contains all data arriving at the transmitter within an audio sample period. The data block conta
32、ins all data which make up an “event”. The transmitter shall specify the presentation time of the event at the receiver. A receiver for professional use shall have the capability of presenting events at the time specified by the transmitter. A consumer-use or cost-sensitive receiver is not required
33、to support this presentation-time adjustment capability. If a function block receives a CIP, processes it and subsequently re-transmits it, the SYT of the outgoing CIP shall be the sum of the incoming SYT and the processing delay. The transmitter shall add TRANSFER_DELAY to the quantized timing of a
34、n event to construct the SYT. The TRANSER_DELAY value is initialized with the DEFAULT_TRANSFER_DELAY value. For professional use, TRANSFER_DELAY may be changed to achieve a shorter TRANSFER_DELAY value, according to the bus configuration. Products for consumer use are not required to support the mod
35、ification of TRANSFER_DELAY. The DEFAULT_TRANSFER_DELAY value is (354,17 + 125)s, which accommodates the maximum latency time of CIP transmission through an arbitrated short bus reset. 7.4 Transmission control 7.4.1 Non-blocking transmission method Figure 6 illustrates the non-blocking transmission
36、method. BS EN 61883-6:2014 22 IEC 61883-6:2014 IEC 2014 SYT_INTERVAL = 4 event CYCLE_ TIME arrival t ime DBC SYT event index CYCLE_ TIME T RA NSFER_ DEL A Y T1 T2 T3 T4 3 6 10 13 16 R1 R2 R3 No Inf o R4 1 2 2 0 R1 R2 R3 R4 Transmitter Fs = 26,7 kHz isochronous cycle Packet Receiver Figure 6 Non-bloc
37、king transmission method The transmitter shall construct a packet in every nominal isochronous cycle. Each packet shall comply with the following constraint: 0 = DEFAULT_TRANSFER_DELAY + 1/STF N 1 000 where TRANSFER_DELAY is the latency of transmission; DEFAULT_TRANSFER_DELAY is the initialized valu
38、e of TRANSFER_DELAY; STF is the sampling transmission frequency; N is the number of audio samples in a CIP. The TRANSFER_DELAY for each STF when DEFAULT_TRANSFER_DELAY = 479,17 s (= 354,17 s + 125 s) is defined in Table 21. It is recommended that the receiver have 250 s of extra buffer. 8 Event type
39、s 8.1 General All the subformats described in this standard shall use only 32-bit aligned events. If multiple event sequences are synchronized, it is possible to convert the sequences into a single event which consists of an ordered collection of those sequences which occurred at the same time. The
40、ordered collection is called a cluster. A cluster consists of ordered units. In the case of data, a unit consists of a single sequence. In the case of a pack, the unit may consist of several sequences packed together. The number of units in a single cluster is called the dimension, and is denoted by
41、 CLUSTER_DIMENSION. Figure 9 illustrates these concepts. BS EN 61883-6:2014IEC 61883-6:2014 IEC 2014 25 Figure 9 Cluster events In order to efficiently cluster non-32-bit aligned sequences which occur at the same time, the pack event type is defined. For example, four events of 24-bit data can be co
42、llected into a pack of three quadlets. An event which is neither a cluster nor a pack is simply called data. Only the pack and data types can be combined into units to make a cluster. All events in a cluster shall be of the same type. UNIT_SIZE is the number of quadlets in a unit. UNIT_DIMENSION is
43、the number of sequences in a unit. The UNIT_DIMENSION of data is always 1. Figure 10 illustrates pack and cluster events. T1 T2 T3 T4SEQ ASEQ BSEQ CSEQ DCluster EventCLUSTER_DIMENSION = 4BS EN 61883-6:2014 26 IEC 61883-6:2014 IEC 2014 Figure 10 Pack and cluster events Figure 11 illustrates the struc
44、ture of a pack which consists of four 24-bit event sequences (UNIT_DIMENSION = 4, UNIT_SIZE = 3). SEQ A SEQ B (upper 8 bit) SEQ B (lower 16 bit) SEQ C (upper 16 bit) SEQ C (lower 8 bit) SEQ D msb Figure 11 Pack event with 24-bit event sequence T1 T2 T3 T4SEQ ASEQ BSEQ CSEQ DSEQ ESEQ FSEQ GSEQ HPack
45、Event (24-bit * 4)Cluster EventUNIT_DIMENSION = 4UNIT_SIZE = 3CLUSTER_DIMENSION = 2BS EN 61883-6:2014IEC 61883-6:2014 IEC 2014 27 Since the cluster is an abstract event, only pack or data shall be specified as an event type for a subformat. However, the DBS shall reflect the size in quadlets of all
46、cluster events in a data block. In the case of a clustered sequence: )MENSIONCLUSTER_DI(Unit_SizeDBS1)(clusters0=nnn(6) where clusters is the number of clusters in the event; Unit_Sizenis the number of quadlets per unit of the nthcluster; CLUSTER_DIMENSIONnis the number of units per cluster of the n
47、thcluster. Generally, the number of elementary sequences in a CIP is given by the following: number of sequences = DBS UNIT_DIMENSION / UNIT_SIZE (7) For the pack illustrated in Figure 9 and Figure 10, DBS = 6, CLUSTER_DIMENSION = 2, UNIT_DIMENSION = 4, UNIT_SIZE = 3. The number of successive events
48、 in a CIP is equal to the number of data blocks in a CIP and given by NEVENTS_SUCCESSIVE = (data_length / 4 CIPH_SIZE) / DBS (8) where data_length is the size of the payload of an isochronous packet (in bytes); CIPH_SIZE is the size of the CIP header (in quadlets). The ordering of sequences in an ev
49、ent is application-specific and is not within the scope of this standard. For example, the identification of audio channels in a multichannel transmission will be defined elsewhere. 8.2 AM824 data 8.2.1 Generic format Figure 12 shows the AM824 format that is used in the following conditions and Table 3 provides a LABEL definition. NOTE A 32-bit data consisting of an 8-bit label and 24-bit data are called AM824 data. UNIT_SIZE = 1 quadlet/unit UNIT_DIMENSION = 1 sequence/unit 24-b
