1、BRITISH STANDARDBS EN 61937-5:2006Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater Systems) format(s)The European Standard EN 61937-5:2006 has the status of a British StandardICS 33.160.60g4
2、9g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61937-5:2006This British Standard was published under the authority of the Standards Policy and
3、Strategy Committee on 31 January 2007 BSI 2007ISBN 978 0 580 49903 6National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61937-5:2006. It is identical with IEC 61937-5:2006. It supersedes BS EN 61937-5:2002, which will be withdrawn on 1 November 2009. The UK
4、 participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on EPL/100 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a
5、contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61937-5 NORME EUROPENNE EUROPISCHE NORM November 2006 CENELEC European Committee
6、for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC membe
7、rs. Ref. No. EN 61937-5:2006 E ICS 33.160.60 Supersedes EN 61937-5:2002English version Digital audio - Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 5: Non-linear PCM bitstreams according to the DTS (Digital Theater Systems) format(s) (IEC 61937-5:2006) Audionumrique
8、- Interface pour les flux de bits audio codage PCM (MIC) non linaire conformment la CEI 60958 Partie 5: Flux de bits PCM non linaire conformment aux formats DTS (Systmes numriques pour salles de spectacle) (CEI 61937-5:2006) Digitalton - Schnittstelle fr nichtlinear-PCM-codierte Audio-Bitstrme unter
9、 Verwendung von IEC 60958 Teil 5: Nichtlineare PCM-Bitstrme fr DTS (Digitale Theatersysteme)-Format(e) (IEC 61937-5:2006) This European Standard was approved by CENELEC on 2006-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giv
10、ing 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 any CENELEC member. This European Standard exists in two official ve
11、rsions (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. CENELEC members are the national electrotechnical committees of Au
12、stria, Belgium, 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, Switzerland and the United Kingdom. Foreword
13、The text of the International Standard IEC 61937-5:2006, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the formal vote and was approved by CENELEC as EN 61937-5 on 2006-11-01 without any modification. This European Standard supersedes EN 61937-5:2002. Th
14、is edition includes the following significant technical changes with respect to EN 61937-5:2002: references to the company name Digital Theater Systems have been changed to DTS which is consistent with the official change of the company name; DTS type IV has been added to Table 1 and 5.3.4 describin
15、g type IV has been added; Annex A, which provides examples of the use of the repetition period parameter introduced in subclause 5.3.4, has been added. 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
16、 or by endorsement (dop) 2007-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61937-5:2006 was approved by CENELEC as a European Standar
17、d without any modification. _ 2 EN 61937-5:2006CONTENTS 1 Scope.4 2 Normative references .4 3 Terms, definitions, abbreviations and presentation convention .4 3.1 Terms and definitions .4 3.2 Abbreviations 4 3.3 Presentation convention 5 4 Mapping of the audio bitstream on to IEC 61937-1 .5 4.1 DTS
18、burst-info.5 5 Format of DTS data-bursts .5 5.1 General .5 5.2 Pause data-burst.5 5.3 Audio data-bursts 6 Annex A (informative) Effect of repetition period of data burst and Fs on frame period and maximum data rate in DTS type IV .13 Bibliography14 Table 1 Fields of burst-info 5 Table 2 Repetition p
19、eriod of the pause data-bursts 6 Table 3 Data-type-dependent when DTS type I .6 Table 4 Data-type-dependent when DTS type II 8 Table 5 Data-type-dependent when DTS type III .9 Table 6 Data-type-dependent when DTS type IV.11 Table A.1 DTS type IV payload and frame repetition: some examples13 3 EN 619
20、37-5:2006Annex ZA (normative) Normative references to international publications with their corresponding European publications 15 DIGITAL AUDIO INTERFACE FOR NON-LINEAR PCM ENCODED AUDIO BITSTREAMS APPLYING IEC 60958 Part 5: Non-linear PCM bitstreams according to the (Digital Theater Systems) DTS f
21、ormat(s) 1 Scope This part of IEC 61937 describes audio bitstreams encoded according to the Digital Theater Systems (DTS) format data-types I, II, III, and IV. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only
22、 the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60958-1, Digital audio interface Part 1: General IEC 60958-3, Digital audio interface Part 3: Consumer applications IEC 60958-4, Digital audio interface Part 4: P
23、rofessional applications IEC 61937-1, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 1: General IEC 61937-2, Digital audio Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part 2: Burst Information 3 Terms, definitions, abbreviatio
24、ns and presentation convention For the purposes of this document, the following terms, definitions, abbreviations and presentation convention apply. 3.1 Definitions 3.1.1 latency delay time of an external audio decoder to decode a DTS data-burst, defined as the sum of two values of the receiving del
25、ay time and the decoding delay time 3.2 Abbreviations IEC International Electrotechnical Commission ISO/IEC MPEG The Moving Pictures Expert Group, a joint committee of ISO and IEC 4 EN 61937-5:20063.3 Presentation convention F872h Value F872 in hexadecimal format 4 Mapping of the audio bitstream on
26、to IEC 61937-1 The coding of the bitstream and data-burst is in accordance with IEC 61937-1 and 61937-2. 4.1 DTS 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 Repeti
27、tion period of data-burst in IEC 60958 frames 0-4 Data-type 0-10 According to IEC 61937 11 DTS type I Bit 0 of Pa 512 12 DTS type II Bit 0 of Pa 1 024 13 DTS type III Bit 0 of Pa 2 048 14-16 According to IEC 61937 17 DTS type IV Dependent on bits 8-10 14-31 According to IEC 61937 Bit 0 of Pa 5, 6 Re
28、served 7 According to IEC 61937 8-10 Reserved for DTS types I, II and III For the repetition period for DTS type IV, see Table 6 11, 12 Reserved 13-15 According to IEC 61937 5 Format of DTS data-bursts This clause specifies the audio data-bursts DTS type I, DTS type II, DTS type III and DTS type IV.
29、 Specific properties such as reference points, repetition period, the method of filling stream gaps, and decoding latency are specified for each data-type. 5.1 General The decoding latency (or delay), indicated for the data-types, should be used by the transmitter to schedule data-bursts as necessar
30、y to establish synchronization between picture and decoded audio. 5.2 Pause data-burst Pause data-burst for DTS type I, DTS type II, DTS type III and DTS type IV is given in Table 2. 5 EN 61937-5:2006Table 2 Repetition period of the pause data-bursts Repetition period of pause data-burst Data-type o
31、f audio data-burst Mandatory Recommended DTS type I - 3 IEC 60958 frames DTS type II - 3 IEC 60958 frames DTS type III - 3 IEC 60958 frames DTS type IV - 3 IEC 60958 frames 5.3 Audio data-bursts 5.3.1 DTS type I The DTS bitstream consists of sequences of DTS frames. The data-type of a DTS data-burst
32、 type I is 0Bh. The data-burst is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits. The burst-payload of each data-burst of DTS type I data shall contain one complete DTS-frame and represents 512 samples for each encoded channel. NOTE 1 The length of the DT
33、S type I data-burst depends on the encoded bit rate (which determines the DTS-frame length). NOTE 2 The reference to the specification for the DTS bitstream, representing 512 samples of encoded audio per frame, is given in the bibliography. Bit 0 of Pa DTS frame DTS type I burst_payload Pd Pa Pb Pc
34、DTS frame Repetition period of the burst Stuffing Bit 0 of PaRegular rate of the DTS frames DTS type I burst_payload Pd Pa Pb Pc IEC 2671/05 Figure 1 DTS type I data-burst The data-type-dependent information for DTS type I is given in Table 3. Table 3 Data-type-dependent when DTS type I Bits of Pc L
35、SBMSB Value Contents8-12 00h Reserved, shall be set to 0 The reference point of a DTS type I data-burst is bit 0 of Pa and occurs exactly once every 512 sampling periods. The data-burst containing DTS type I frames occurs at a regular rate, with the reference point of each DTS type I data-burst begi
36、nning 512 IEC 60958 frames after the reference point of the preceding DTS type I data-burst (of the same bit-stream-number). It is recommended that pause data-bursts be used to fill stream gaps in the DTS type I bitstream, as described in IEC 61937, and that pause data-bursts be transmitted with a r
37、epetition period of 3 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 3 IEC 60958 frames), or to meet the requirement on burst spacing (see IEC 61937). 6 EN 61937-5:2006When a stream gap in a DTS type I stream
38、 is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 512 sampling periods following the Pa of the previous DTS type I frame. It is recommended that the sequence(s) of pause data-bursts which fill the stream gap should continue from this point up to (as
39、 close as possible considering the 3 IEC 60958 frame length of the pause data-burst) the Pa of the first DTS type I data-burst which follows the stream gap. NOTE 3 The gap-length parameter contained in the pause data-burst is intended to be interpreted by the DTS decoder as an indication of the numb
40、er of decoded PCM samples which are missing (due to the resulting audio gap). Bit 0 of Pa DTS frame DTS type I burst_payload Pd Pa Pb Pc DTS frame Repetition period of the burst Stuffing Bit 0 of PaLatency of DTS decoder Decoding delay (256 samples) DTS type I burst_payload Pd Pa Pb Pc IEC 2672/05 F
41、igure 2 Latency of DTS type II decoding NOTE 4 The latency of a DTS decoder is defined as a delay measured from the reference point and equal to one frame (10,67 ms) plus 5,33 ms (equivalent to 256 samples). This is 768 PCM samples or 16 ms at 48 kHz sampling frequency. 5.3.2 DTS type II The DTS bit
42、stream consists of sequences of DTS frames. The data-type of a DTS data-burst type II is 0Ch. The data-burst is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits. The burst-payload of each data-burst of DTS type II data shall contain one complete DTS-frame a
43、nd represents 1 024 samples for each encoded channel. NOTE 1 The length of the DTS type II data-burst depends on the encoded bit rate (which determines the DTS-frame length). NOTE 2 The reference to the specification for the DTS bitstream, representing 1 024 samples of encoded audio per frame, is gi
44、ven in the bibliography. Bit 0 of Pa DTS frame DTS type II burst_payload Pd Pa Pb Pc DTS frame Repetition period of the burst Stuffing Bit 0 of PaRegular rate of the DTS frames DTS type II burst_payload Pd Pa Pb Pc IEC 2673/05Figure 3 DTS type II data-burst The data-type-dependent information for DT
45、S type II is given in Table 4. 7 EN 61937-5:2006Table 4 Data-type-dependent when DTS type II Bits of Pc LSBMSB Value Contents8-12 00h Reserved, shall be set to 0 The reference point of a DTS type II data-burst is bit 0 of Pa and occurs exactly once every 1 024 sampling periods. The data-burst contai
46、ning DTS type II frames shall occur at a regular rate, with the reference point of each DTS type II data-burst beginning 1 024 IEC 60958 frames after the reference point of the preceding DTS type II data-burst (of the same bit-stream-number). It is recommended that pause data-bursts be used to fill
47、stream gaps in the DTS type II bitstream, as described in IEC 61937, and that pause data-bursts be transmitted with a repetition period of 3 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 3 IEC 60958 frames),
48、 or to meet the requirement on burst spacing (see IEC 61937). When a stream gap in a DTS type II stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 1 024 sampling periods following the Pa of the previous DTS type II frame. It is recommended tha
49、t 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 3 IEC 60958 frame length of the pause data-burst) the Pa of the first DTS type II data-burst which follows the stream gap. NOTE 3 The gap-length parameter contained in the pause data-burst is intended to be interpreted by the DTS decoder as an indication of the number of decoded PCM samples which are missing (due to t
