1、 INTERNATIONAL STANDARD IEC61937-2Second edition2007-05Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 2: Burst-info Reference number IEC 61937-2:2007(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. U
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8、7-05Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 2: Burst-info L For price, see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission 2 61937-2 IEC:2007(E) CONTENTS FOREWORD.3 1 Scope.5 2 Normati
9、ve references .5 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions .6 3.2 Abbreviations 7 4 Burst-info .7 4.1 General .7 4.2 Data-type and subdata-type 7 4.3 Audio data-bursts 9 4.3.1 General .9 4.3.2 AC-39 4.3.3 MPEG-1 layer-1.9 4.3.4 MPEG-1 layer-2 or -3 or MPEG-2 without extensio
10、n 9 4.3.5 MPEG-2 with extension .9 4.3.6 MPEG-2 AAC 9 4.3.7 MPEG-2 layer-1 low sampling frequency .9 4.3.8 MPEG-2 layer-2 low sampling frequency .10 4.3.9 MPEG-2 layer-3 low sampling frequency .10 4.3.10 DTS type I .10 4.3.11 DTS type II 10 4.3.12 DTS type III .10 4.3.13 DTS type IV.10 4.3.14 ATRAC
11、10 4.3.15 ATRAC 2/3 10 4.3.16 ATRAC-X.10 4.3.17 MPEG-2 AAC low sampling frequency .10 4.3.18 MPEG-4 AAC 11 4.3.19 Windows Media Audio professional11 4.3.20 Enhanced AC-3 .11 4.3.21 MAT 11 Table 1 Fields of burst-info 7 Table 2 Data-types 8 61937-2 IEC:2007(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISS
12、ION _ DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 2: Burst-info FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees
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21、lication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is 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 possi
22、bility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61937-2 has been prepared by Technical Area 4, of IEC technical committee 100: Audio, video and mu
23、ltimedia systems and equipment. This second edition of IEC 61937-2 cancels and replaces the first edition published in 2000. This edition contains the following significant technical changes with respect to the previous edition. a) New audio data-types of enhanced AC-3 data, MPEG-2 AAC low sampling
24、frequency, MPEG-4 AAC, DTS type IV, ATRAC-X, WMA professional and MAT are added. b) Data-type field in Pc is expanded from bit 0-4 to 0-6. 4 61937-2 IEC:2007(E) The text of this standard is based on the following documents: CDV Report on voting 100/1115/CDV 100/1221/RVC Full information on the votin
25、g for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The list of all the parts of the IEC 61937 series, under the general title Digital audio Interface for non-linea
26、r PCM encoded 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
27、publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 61937-2 IEC:2007(E) 5 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Pa
28、rt 2: Burst-info 1 Scope This part of IEC 61970 specifies the digital audio interface to convey non-linear PCM encoded audio bitstreams applying IEC 60958-1 and IEC 60958-3. This standard specifies burst-info which defines content information about the data contained in the burst payload. 2 Normativ
29、e references The following referenced 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 60958-1, Digital audio interface
30、 Part 1: General IEC 60958-3, Digital audio interface Part 3: Consumer applications IEC 61937-1, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 1: General IEC 61937-3, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958
31、Part 3: Non-linear PCM bitstreams according to the AC-3 format IEC 61937-4, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 4: Non-linear PCM bitstreams according to the MPEG audio formats IEC 61937-5, Digital audio Interface for non-linear PCM encoded aud
32、io bitstreams applying IEC 60958 Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater Systems) format(s) IEC 61937-6, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 6: Non-linear PCM bitstreams according to the MPEG-2 AAC and MPEG-4 AAC
33、 formats IEC 61937-7, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 7: Non-linear PCM bitstreams according to the ATRAC, ATRAC2/3 and ATRAC-X formats IEC 61937-8, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part
34、 8: Non-linear PCM bitstreams according to the Windows Media Audio (WMA) Professional format IEC 61937-9, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 9: Non-linear PCM bitstreams according to the MAT format1 1To be published. 6 61937-2 IEC:2007(E) ISO/
35、IEC 11172-3: Information technology Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mb/s Part 3: Audio ISO/IEC 13818-3, Information technology Generic coding of moving pictures and associated audio information Part 3: Audio ISO/IEC 13818-7, Information tec
36、hnology Generic coding of moving pictures and associated audio information Advanced Audio Coding (AAC) ISO/IEC 14496-3, Information technology Coding of audio-visual objects Part 3: Audio ITU-R Recommendation BS.1196, Audio coding for digital terrestrial television broadcasting 3 Terms, definitions
37、and abbreviations 3.1 Terms and definitions For the purpose of this document, the following terms and definitions apply. audio data-burst data-burst with an encoded audio frame as burst-payload audio data-word 16-bit data word audio frame fixed number of audio samples. The number of samples in an au
38、dio frame is dependent on the particular encoding system which is used to encode the audio frame into the encoded audio frame audio gap period in the sequence of baseband audio samples where valid samples of audio are not available bitstream non-linear PCM encoded audio source, represented in a sequ
39、ence of bits. In this interface the bitstream consists of a sequence of data-bursts data-burst packet of data, including the burst-preamble, to be transmitted across the interface burst-payload information content of the data-burst burst-preamble header for the data-burst, containing synchronization
40、 and information about the data contained in the burst-payload data-type reference to the type of payload of the data-bursts encoded audio frame minimum decodable unit of an encoded data sequence. Each encoded audio frame is the encoded representation of a fixed number of audio samples (for each ori
41、ginal audio channel). The number of samples which are encoded into an encoded audio frame depends on the particular encoding system which is used to encode the audio frame into the encoded audio frame length-code length of the data-burst-payload in bits repetition period period between the reference
42、 point of the current data-burst, and the reference point of the immediately following data-burst of the same data-type sampling frequency sampling frequency of the encoded PCM audio samples (i.e. before encoding and after decoding) sampling period period related to the sampling frequency of the PCM
43、 audio samples, represented in the encoded bitstream stuffing occupying the unused data capacity of the interface stuffing sub-frame occupying the unused data capacity in 16-bit audio data words stream gap period within the encoded audio bitstream without any audio frame; a discontinuity in the bits
44、tream. Typically, a stream gap will occur between encoded audio frames 61937-2 IEC:2007(E) 7 3.2 Abbreviations ATRAC Adaptive TRansform Acoustic Coding ATRAC2 Adaptive TRansform Acoustic Coding 2 ATRAC3 Adaptive TRansform Acoustic Coding 3 ATRAC2/3 ATRAC2 and/or ATRAC3 ATRAC-X Adaptive TRansform Aco
45、ustic Coding-X ATSC Advanced Television Systems Committee IEC International Electrotechnical Commission ISO/IEC MPEG Moving Pictures Expert Group, a joint committee of ISO and IEC ITU-R International Telecommunication Union, Radiocommunication Bureau MPEG Motion Pictures Expert Group, a joint commit
46、tee of ISO and IEC SMPTE Society of Motion Picture and Television Engineers 4 Burst-info 4.1 General The 16-bit burst-info contains information about the data which will be found in the data-burst. Fields of burst-info is specified in Table 1. Table 1 Fields of burst-info Bits of Pc Value Contents0-
47、4 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, 6.1.7 and 6.1.7.1. 4.2 Data-
48、type and subdata-type 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 data-types are defined in Table 2. Any combination of data-type and subdata-type which is not defined in Table 2 shall not be transmitted.
49、 8 61937-2 IEC:2007(E) Table 2 Data-types Data-type Value of PC bit 0-4 Subdata-type Value of PC bit 5-6 Contents Reference point R Repetition period of data-burst measured in IEC 60958 frames 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 exten
