Bsi bs en 61937 6 2006 + a1 2014

BRITISH STANDARD 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 audio formats MPEG-4 AAC formats The European Standard EN 61937-6:2006 has the status of a British Standard ICS 33.160.60; 35.040
  
  

 


 

  
 BS EN EN 61937-6:2006 61937-6:2006 +A1:2014 BS EN 61937-6:2006+A1:2014 National foreword This British Standard is the UK implementation of EN 61937-6:2006+A1:2014 It is identical to IEC 61937-6:2006, incorporating amendment 1:2014 It supersedes BS EN 61937-6:2006, which is withdrawn The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to IEC text carry the number of the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 A1 is indicated by  The UK participation in its preparation 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 The 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 from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 81636 Amendments/corrigenda issued since publication Date Comments 30 June 2014 Implementation of IEC amendment 1:2014 with CENELEC endorsement A1:2014 Annex ZA updated EUROPEAN STANDARD NORME EUROPÉENNE EN 61937-6 61937-6:2006+A1 EUROPÄISCHE NORM April 2006 2014 July ICS 33.160.60, 35.040 Supersedes EN 61937-6:2002 English version Digital audio – Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 Part Part 6: 6: Non-linear Non-linear PCM PCM bitstreams according according to to the the MPEG-2 MPEG-2 AAC AAC formats andand MPEG-4 MPEG-4 AAC audio formats (IEC 61937-6:2006) Audionumérique – Interface pour les flux de bits audio codage MIC non linéaire, conformément la CEI 60958 Partie 6: Flux de bits MIC non linéaire selon les formats MPEG-2 AAC et MPEG-4 AAC (CEI 61937-6:2006) Digitalton – Schnittstelle für nichtlinear-PCM-codierte Audio-Bitströme unter Verwendung von IEC 60958 Teil 6: Nichtlineare PCM-Bitströme nach MPEG-2 AAC- und MPEG-4 AACAudio-Formaten (IEC 61937-6:2006) This European Standard was approved by CENELEC on 2006-07-01 CENELEC members are bound to comply with the CEN/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 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 CENELEC members are the national electrotechnical committees of Austria, 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 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für 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 members Ref No EN 61937-6:2006 E EN 61937-6:2006 EN 61937-6:2006 BS EN 61937-6:2006+A1:2014 EN 61937-6:2006 EN 61937-6:2006+A1:2014 EN 61937-6:2006 –2– –2– –- 2 -– Foreword –2– Foreword Foreword prepared by IEC TC 100, Audio, video and The text of the International Standard IEC 61937-6:2006, Foreword prepared by IEC TC 100, Audio, video and The text ofsystems the International Standard 61937-6:2006, multimedia and equipment, wasIEC submitted to the formal vote and was approved by CENELEC as The text ofsystems the International Standard IEC 61937-6:2006, prepared by IEC 100, Audio, video and multimedia and equipment, wasmodification submitted to the formal vote and was TC approved by CENELEC as EN 61937-6 on 2006-07-01 without any The text ofsystems the International Standard IEC 61937-6:2006, prepared by IEC 100, Audio, video and multimedia and equipment, wasmodification submitted to the formal vote and was TC approved by CENELEC as EN 61937-6 on 2006-07-01 without any multimedia and equipment, wasmodification submitted to the formal vote and was approved by CENELEC as EN 61937-6systems on 2006-07-01 without any This European Standard supersedes EN 61937-6:2002 EN 61937-6 on Standard 2006-07-01 without any This European supersedes ENmodification 61937-6:2002 This European Standard supersedes EN 61937-6:2002 It includes the following significant technical changes with respect to EN 61937-6:2002: This European Standardsignificant supersedes EN 61937-6:2002 It includes the following technical changes with respect to EN 61937-6:2002: It includes the following significant technical changes with respect to EN 61937-6:2002: a) addition of data-type for MPEG2 AAC low sampling frequency; It theoffollowing significant technical changes withfrequency; respect to EN 61937-6:2002: a)includes addition data-type for MPEG2 AAC low sampling a) b) a) b) addition of data-type for MPEG2 AAC low sampling frequency; additon of data-type for MPEG-4 AAC addition of data-type data-type for for MPEG-4 MPEG2 AAC additon of AAC.low sampling frequency; b) additon of data-type for MPEG-4 AAC The following dates were fixed: b) following additon ofdates data-type MPEG-4 AAC The were for fixed: The following were fixed: – latest date dates by which the EN has to be implemented The following dates were fixed: – latest date by which the EN hasoftoanbeidentical implemented at national level by publication – latest date by which the EN has to be at national level by publication of an identical national standard or by endorsement implemented – latest date by which the EN hasoftoanbeidentical implemented at national level byorpublication national standard by endorsement at national level by publication of an identical national standard or by endorsement – latest date by which the national standards conflicting national standard or be by withdrawn endorsement – with latest date by which the national standards conflicting the EN have to – with latestthe date which thewithdrawn national standards conflicting ENby have to be – with latestthe date which thewithdrawn national standards conflicting ENby have to be Annex ZA has been added by CENELEC with the EN have to be withdrawn Annex ZA has been added by CENELEC (dop) (dop) (dop) (dop) (dow) (dow) (dow) (dow) 2007-07-01 2007-07-01 2007-07-01 2007-07-01 2009-07-01 2009-07-01 2009-07-01 2009-07-01 Annex ZA has been added by CENELEC Annex ZA has been added by CENELEC notice Endorsement Endorsement notice Endorsement notice The text of the International Standard IEC 61937-6:2006 was approved by CENELEC as a European Endorsement The text of the International Standard IEC 61937-6:2006notice was approved by CENELEC as a European Standard without any modification The text of the International Standard IEC 61937-6:2006 was approved by CENELEC as a European Standard without any modification The61937-6:2006/A1:2014 text of the International Standard IEC 61937-6:2006 was approved by CENELEC as a European EN -2Standard without any modification Standard without any modification ForewordForeword to amendment A1 The text of document 100/2052/CDV, future IEC 61937-6:2006/A1, prepared by Technical Area "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 61937-6:2006/A1:2014 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) 2014-12-05 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-03-05 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 61937-6:2006/A1:2014 was approved by CENELEC as a European Standard without any modification BS EN 61937-6:2006+A1:2014 EN 61937-6:2006+A1:2014 -3– 21 – – 21 – Annex ZA Annex ZA (normative) (normative) EN 61937-6:2006 EN 61937-6:2006 Normative references to international publications Normative to international publications with their references corresponding European publications with their corresponding European publications The following referenced documents are indispensable The following referenced documents are indispensable references, only the edition cited applies For undated references, only the edition cited applies For undated document (including any amendments) applies document (including any amendments) applies for the application of this document For dated for the application of this document For dated references, the latest edition of the referenced references, the latest edition of the referenced NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies -3EN 61937-6:2006/A1:2014 applies -3EN 61937-6:2006/A1:2014 Year Title EN/HD Year Annex ZA Year Title EN/HD Year Series Digital audio interface EN 60958 Series (normative) Annex ZA Series Digital audio interface EN 60958 Series (normative) Series Digital audio - Interface for non-linear PCM EN 61937 Series Normative references to international publications Series Digital audio - Interface forapplying non-linear PCM EN 61937 Series encoded audio bitstreams encoded audio bitstreams applying publications with their corresponding European IECreferences 60958 Normative to international publications IEC 60958 1) 2) with their corresponding European publications IEC 61937-1 Digital audio - Interface for non-linear PCM EN 61937-1 -1) 20032) IEC 61937-1 Digital audio Interface for non-linear PCM EN 61937-1 2003 encoded audio bitstreams Replacement and- addition in Annex ZA of ENapplying 61937-6:2006: encoded audio bitstreams applying IEC 60958 IEC 60958 Replacement and addition in Annex ZA of EN 61937-6:2006: Part 1: General Part 1: General 1) Publication Year Title EN/HD Year 2) IEC 61937-2 -1) Digital audio - Interface for non-linear PCM EN 61937-2 20032) IEC 61937-2 Digital audio - Interface forapplying non-linear PCM EN 61937-2 2003 encoded audio bitstreams Publication Year Title EN/HD Year encoded audio bitstreams applying IEC 60958 Replace, in the list of normative references, the following standards by undated references: IEC 60958 Part 2: Burst-info Part 2:references, Burst-info ISO/IEC 13818-7 Information technology Generic coding of - by undated references: Replace, in the list- of normative the- following standards pictures and associated audio ISO/IEC 13818-7 2004 moving Information technology - Generic coding of ISO/IEC 13818-7 2004 Information - -Generic coding - Information technology Genericaudio codingofof - information -technology moving pictures and associated moving pictures associated audio moving picturesand and associated audio Part 7: Advanced Audio Coding (AAC) information information information Part 7: Advanced Audio Coding of (AAC) ISO/IEC 14496-3 Information technology - Coding Coding audioPart Audio Part7:7:Advanced Advanced Audio Coding(AAC) (AAC) visual objects ISO/IEC 14496-3 14496-3 -2001 Information Informationtechnology technology- -Coding Codingofofaudioaudio- - ISO/IEC - 3: Audio ISO/IEC 14496-3 2001 Information technology - Coding of audio+ A1 2003 Part visual objects visual objects + A1 2003 visual objects Part3:3:Audio Audio Part Add, at the end of the existing of normative references the following new publication: Part list 3: Audio Publication Publication IEC 60958 IEC 60958 IEC 61937 IEC 61937 ISO/IEC Information technology references - MPEG audio Add, at 23003-1 the end of -the existing list of normative the following new publication: technologies ISO/IEC 23003-1 Information technology Part 1: MPEG Surround- MPEG audio technologies Part 1: MPEG Surround 1) 1) 2) 2) Undated reference Undated reference Valid edition at date of issue Valid edition at date of issue BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 –3– -4–3– CONTENTS EN 61937-6:2006 EN 61937-6:2006 FOREWORD CONTENTS FOREWORD Scope .6 3 4 5 Normative references .6 Scope .6 Terms, definitions, abbreviations and presentation convention Normative references .6 3.1 Terms and definitions .6 Terms, definitions, abbreviations and presentation convention 3.2 Abbreviations 3.1 Terms and definitions .6 3.3 Presentation convention 3.2 Abbreviations Mapping of the audio bitstream on to IEC 61937 3.3 Presentation convention 4.1 MPEG-2 AAC burst-info Mapping of the audio bitstream on to IEC 61937 4.2 MPEG-4 AAC burst-info 4.1 MPEG-2 AAC burst-info Format of MPEG-2 AAC and MPEG-4 AAC data-bursts 4.2 MPEG-4 AAC burst-info 5.1 Pause data-burst .9 Format of MPEG-2 AAC and MPEG-4 AAC data-bursts 5.2 Audio data-bursts 5.1 Pause data-burst .9 5.2 Audio data-bursts Figure – MPEG-2 AAC data-burst Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure – Latency of MPEG-2 AAC decoding 10 – MPEG-2 AAC data-burst – MPEG-2 AAC half-rate low sampling frequency data-burst 11 – Latency of MPEG-2 AAC decoding 10 – Latency of MPEG-2 AAC half-rate low sampling frequency decoding 12 – MPEG-2 AAC half-rate low sampling frequency data-burst 11 – MPEG-2 AAC quarter-rate low sampling frequency data-burst 13 – Latency of MPEG-2 AAC half-rate low sampling frequency decoding 12 – Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding 14 – MPEG-2 AAC quarter-rate low sampling frequency data-burst 13 – MPEG-4 AAC data-burst 15 – Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding 14 – Latency of MPEG-4 AAC decoding 16 – MPEG-4 AAC data-burst 15 – MPEG-4 AAC half-rate low sampling frequency data-burst 16 – Latency of MPEG-4 AAC decoding 16 – Latency of MPEG-4 AAC half-rate low sampling frequency decoding 18 17 – MPEG-4 AAC half-rate low sampling frequency data-burst 16 10 – MPEG-4 AAC quarter-rate low sampling frequency data-burst 18 – Latency of MPEG-4 AAC half-rate low sampling frequency decoding 17 11 – Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding 20 19 10 – MPEG-4 AAC quarter-rate low sampling frequency data-burst 18 12 – MPEG-4 AAC double-rate high sampling frequency data-burst 20 11 – Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding 19 13 – Latency of MPEG-4 AAC double-rate high sampling frequency decoding 21 12 – MPEG-4 AAC double-rate high sampling frequency data-burst 20 Figure 13 – Latency of MPEG-4 AAC double-rate high sampling frequency decoding 21 Table – Fields of burst-info (data-type=7) Table – Fields of burst-info (data-type=19) Table – Fields of burst-info (data-type=7) Table – Fields of burst-info (data-type=20) Table – Fields of burst-info (data-type=19) Table – Repetition period of pause data-bursts Table – Fields of burst-info (data-type=20) Table – Repetition period of pause data-bursts Table – Repetition period of pause data-bursts Table – Data-type-dependent information for data-type MPEG-2 AAC 10 Table – Repetition period of pause data-bursts Table – Data-type-dependent information for data-type MPEG-2 AAC Table – Data-type-dependent information for data-type MPEG-2 AAC 10 half-rate low sampling frequency 11 Table – Data-type-dependent information for data-type MPEG-2 AAC Table – Data-type-dependent information for data-type MPEG-2 AAC half-rate low sampling frequency 11 quarter-rate low sampling frequency 13 Table – Data-type-dependent information for data-type MPEG-2 AAC quarter-rate low sampling frequency 13 EN 61937-6:2006 -5–4– BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 Table – Data-type-dependent information for data-type MPEG-4 AAC 15 Table 10 – Data-type-dependent information for data-type MPEG-4 AAC half-rate low sampling frequency 17 Table 11 – Data-type-dependent information for data-type MPEG-4 AAC quarter-rate low sampling frequency 18 19 Table 12 – Data-type-dependent information for data-type MPEG-4 AAC 21 double-rate high sampling frequency 20 EN 61937-6:2006 –6– 3.1.3 BS EN 61937-6:2006+A1:2014 LC profile with SBR IEC 61937-6:2006+A1:2014 -7low complexity profile with spectral band replication identified in ISO/IEC 13818-7 3.1.4 latency delay time of an external audio decoder to decode a MPEG-2 AAC or MPEG-4 AAC data-burst defined as the sum of two values of the receiving delay time and the decoding delay time EN 61937-6:2006 –6–  3.1.5 3.1.5 MPEG-4 AAC profile AAC 3.1.3 profile EN 61937-6:2006 –6– MPEG-4 AAC profile identified in ISO/IEC 14496-3 AACprofile profile identified in ISO/IEC 14496-3 LC with SBR low complexity profile with spectral band replication identified in ISO/IEC 13818-7 3.1.6 3.1.3 3.1.6 MPEG-4 HE-AAC profile LC profile with SBR HE-AAC profile 3.1.4 MPEG-4 HE-AAC profile identified in ISO/IEC 14496-3 identified in ISO/IEC 13818-7 low complexity profile with band replication HE-AAC profile identified inspectral ISO/IEC 14496-3 latency delay time of an external audio decoder to decode a MPEG-2 AAC or MPEG-4 AAC data-burst 3.1.7 3.1.4 defined as the sum of two values of the receiving delay time and the decoding delay time 3.2 Abbreviations MPEG-4 latency HE-AAC V2 profile MPEG-4 HE-AAC V2 profileaudio identified in ISO/IEC 14496-3 delay an external decoder to decode a MPEG-2 AAC or MPEG-4 AAC data-burst AAC time ofAdvanced Audio Coding 3.1.5 defined as the sum of two values of the receiving delay time and the decoding delay time AAC ADTSprofileAudio Data Transport Stream 3.1.8 AAC profile identified in ISO/IEC 14496-3 MPEG SBR Surround Spectral Band Replication 3.1.5 technology used for coding of multichannel signals based on a down mixed signal of the original AAC profile HE-AAC High Efficiency AAC spatial parameters 3.1.6 multichannel signal, andinassociated AAC profile identified ISO/IEC 14496-3 HE-AAC profile Note to entry: MPEG Surround defined in14496-3 ISO/IEC 23003-1. HE-AAC profile identified in inISO/IEC 3.3 Presentation convention 3.1.6 Value “01” in binary format 01 HE-AAC profile 3.2 Abbreviations HE-AAC profile identified in ISO/IEC 14496-3 AAC Advanced Audio Coding Mapping of the audio bitstream on to IEC 61937 3.2 Abbreviations ADTS Audio Data Transport Stream SBR Spectral Band Replication AAC Audio Coding The coding Advanced of the bitstream and data-burst is in accordance with IEC 61937 HE-AAC High Efficiency AAC Stream  HE-AAC MPEG-4 HighTransport Efficiency AAC ADTS Audio Data 4.1 MPEG-2 AACHigh burst-info HE-AAC V2 MPEG-4 Efficiency AAC Version SBR Spectral Band Replication 3.3 Presentation convention MPEG Moving Picture Experts Group is given in Table HE-AAC High Efficiency AAC MPEG-2 AAC burst-info (data-type=7) Value “01” in binary format 01 3.3 Presentation convention Table – Fields of burst-info (data-type=7) Value “01” in binary format 01 4Bits Mapping of the audio bitstream on to IEC 61937 of Pc Value Contents Reference point R Repetition period of data-burst in IEC 60958 frames The coding of the bitstream and data-burst is in accordance with IEC 61937 bitstream on to IEC 61937 0-4 Mapping of the audio Data-type MPEG-2 AAC ADTS Bit of Pa 024 4.1 MPEG-2 AAC burst-info The coding of the bitstream and data-burst is in accordance with IEC 61937 5,6 00 Reserved MPEG-2 AAC burst-info (data-type=7) is given in Table 7-15 In accordance with IEC 61937-1 and 4.1 MPEG-2 AAC burst-info IEC 61937-2 Table – Fields of burst-info (data-type=7) MPEG-2 AAC burst-info (data-type=7) is given in Table MPEG-2 burst-info Contents (data-type=19) is given in Table Reference Bits of Pc AAC Value point R Table – Fields of burst-info (data-type=7) Repetition period of data-burst in IEC 60958 frames Bits of Pc 0-4 Reference point R Bit of Pa Repetition period of data-burst in 024 IEC 60958 frames Bit of Pa 024 Value 5,6 0-4 7-15 5,6 7-15 00 00 Contents Data-type MPEG-2 AAC ADTS Reserved Data-type In accordance with IEC 61937-1 and MPEG-2 AAC ADTS IEC 61937-2 Reserved In accordance with IEC 61937-1 and MPEG-2 AAC burst-info IEC (data-type=19) is given in Table 61937-2 MPEG-2 AAC burst-info (data-type=19) is given in Table BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 -8–7– EN 61937-6:2006 Table – Fields of burst-info (data-type=19) Bits of Pc Value 0-4 Reference point R Repetition period of data-burst in IEC 60958 frames Data-type 19 5,6 MPEG-2 AAC ADTS low sampling frequency Depends on subdata-type Subdata-type 00 Subdata-type for MPEG-2 AAC ADTS halfrate low sampling frequency Bit of Pa 048 01 Subdata-type for MPEG-2 AAC ADTS quarter-rate low sampling frequency Bit of Pa 096 10 2, 11 7-15 4.2 Contents Reserved In accordance with IEC 61937-1 and IEC 61937-2 MPEG-4 AAC burst-info MPEG-4 AAC burst-info (data-type=20) is given in Table Table – Fields of burst-info (data-type=20) Bits of Pc Value 0-4 5,6 Reference point R Repetition period of data-burst in IEC 60958 frames Data-type 20 7-15 Contents MPEG-4 AAC Depends on subdata-type Subdata-type 00 Subdata-type for MPEG4 AAC Bit of Pa 1024 01 Subdata-type for MPEG4 AAC half-rate low sampling frequency Bit of Pa 048 10 Subdata-type for MPEG4 AAC quarter-rate low sampling frequency Bit of Pa 096 11 Subdata-type for MPEG4 AAC double-rate high sampling frequency Bit of Pa 512 In accordance with IEC 61937-1 and IEC 61937-2 Format of MPEG-2 AAC and MPEG-4 AAC data-bursts This clause specifies the audio data-bursts MPEG-2 AAC and MPEG-4 AAC Specific properties such as reference points, repetition period, the method of filling stream gaps, and decoding latency are specified for each data-type The decoding latency (or delay), indicated for the data-types, should be used by the transmitter to schedule data-bursts as necessary to establish synchronization between the picture and the decoded audio EN 61937-6:2006 5.1 5.1.1 BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 -9–8– Pause data-burst The data MPEG-2 AAC The pause data-burst for MPEG-2 AAC is given in Table Table – Repetition period of pause data-bursts Data-type of audio data-burst Repetition period of pause data-burst Mandatory Recommended MPEG-2 AAC - 32 IEC 60958 frames MPEG-2 AAC and half-rate low sampling frequency - 64 IEC 60958 frames MPEG-2 AAC and quarter-rate low sampling frequency - 128 IEC 60958 frames 5.1.2 The data MPEG-4 AAC The pause data-burst for MPEG-4 AAC is given in Table Table – Repetition period of pause data-bursts Data-type of audio data-burst Repetition period of pause data-burst Mandatory Recommended MPEG-4 AAC - 32 IEC 60958 frames MPEG-4 AAC and half-rate low sampling frequency - 64 IEC 60958 frames MPEG-4 AAC and quarter-rate low sampling frequency - 128 IEC 60958 frames MPEG-4 AAC double-rate high sampling frequency - 16 IEC 60958 frames 5.2 5.2.1 Audio data-bursts The data MPEG-2 AAC The stream of the data-bursts for MPEG-2 AAC consists of sequences of MPEG-2 AAC ADTS frames The data-type of an MPEG-2 AAC data-burst is The data-burst is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits The burstpayload of each data-burst of MPEG-2 AAC data shall contain one complete MPEG-2 AAC ADTS frame and represents 024 samples for each encoded channel The length of the MPEG-2 AAC data-burst depends on the encoded bit rate (which determines the MPEG2 AAC ADTS frame length) The reference to the specification for the MPEG-2 AAC bitstream, representing 024 samples of encoded audio per frame is found in ISO/IEC 13818-7 Pa Pb Pc Pd MPEG-2 AAC burst_payload Pa Pb Pc Pd MPEG-2 AAC burst_payload Bit of Pa Bit of Pa AAC frame Stuffing Regular rate of the MPEG-2 AAC frames Repetition period of the burst Figure – MPEG-2 AAC data-burst The data-type-dependent information for MPEG-2 AAC is given in Table AAC frame BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 10 –9– EN 61937-6:2006 Table – Data-type-dependent information for data-type MPEG-2 AAC Bits of Pc Value Contents 00 No indication 01 LC profile 02, 03 Reserved for future profile 04-31 Reserved LSB MSB 8-12 The reference point of an MPEG-2 AAC data-burst is bit of Pa and occurs exactly once every 024 sampling periods The data-burst containing MPEG-2 AAC frames shall occur at a regular rate, with the reference point of each MPEG-2 AAC data-burst beginning 024 IEC 60958 frames after the reference point of the preceding MPEG-2 AAC data-burst (of the same bitstream number) It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-2 AAC bitstream as described in IEC 61937, and that pause data-bursts be transmitted with a repetition period of 32 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream-gap length (which may not be a multiple of 32 IEC 60958 frames), or to meet the requirement on burst spacing (see IEC 61937) When a stream gap in an MPEG-2 AAC stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 024 sampling periods following the Pa of the previous MPEG-2 AAC frame It is recommended that the sequence(s) of pause databursts which fill the stream gap should continue from this point up to (as close as possible to, considering the 32 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG2 AAC data-burst which follows the stream gap The gap-length parameter contained in the pause data-burst is intended to be interpreted by the MPEG-2 AAC decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.2 Latency of MPEG-2 AAC decoding The latency of an external audio decoder to decode MPEG-2 AAC is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-2 AAC burst-payload MPEG-2 AAC frame MPEG-2 AAC burst-payload Pa Pb Pc Pd Stuffing Bit of Pa MPEG-2 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-2 AAC decoder Figure – Latency of MPEG-2 AAC decoding EXAMPLE The receiving delay time to receive a whole data-burst with maximum length is calculated as follows The length of preamble is 64 bits The maximum length of whole databurst payload is 192 bit in the Japanese satellite DTV specified maximum bit rate of EN 61937-6:2006 – 10 384 kbit/s In this case, the maximum length of – data-bursts is 256 bit The receiving delay time is calculated as 5,375 ms in the case of the 48 kHz sampling frequency The decoding delay time is calculated as 21,333 ms It is of equal value to the decoding time for one MPEG2 AAC frame data Hence, the latency of MPEG-2 AAC decoding is approximately 26,708 ms The absolute maximum length of the data-burst is calculated as follows In order to make a burst, a minimum stuffing consists of stuffing words (Pz of 16 bits) per burst The repetition EN 61937-6:2006 – 10 – BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 11 - value to the decoding delay time is calculated as 21,333 ms It is of equal time for one MPEGEN 61937-6:2006 – 10 – AAC frame data Hence, the latency of MPEG-2 AAC decoding is approximately 26,708 ms delayabsolute time is calculated 21,333 ms data-burst It is of equal value to theasdecoding for one MPEGThe maximum as length of the is calculated follows time In order to make a AAC frame data Hence, the latency of MPEG-2 AAC decoding is approximately 26,708 ms burst, a minimum stuffing consists of stuffing words (Pz of 16 bits) per burst The repetition period of data-burst in IEC 60958 frames is 024 Therefore, the maximum length of data-burst The absolute calculated follows In order to make a leads to 024maximum sample * length ch * of16the bitsdata-burst – word is * 16 bits = 32as704 bits The receiving delay burst, is a minimum stuffing words of (Pz the of 1648 bits) burst Thefrequency repetition time calculated as consists 21,29 msof 4instuffing the case kHzpersampling period of data-burst IEC 60958 frames is 024 Therefore, maximum data-burst (32 704/1 536 000 =in 0,021 29) The decoding delay time isthe 21,333 ms aslength above.of Hence, the leads toof1 MPEG-2 024 sample ch * 16isbits – wordof* 42,62 16 bitsms = 32 704 bits The receiving delay latency AAC* decoding a maximum time is calculated as 21,29 ms in the case of the 48 kHz sampling frequency (32 536 000 = (for 0,021 29) The decoding delay time is 21,333 ms ofaslatency above.isHence, the For 704/1 synchronization example, with video), the recommended value 42,62 ms latency of MPEG-2 AAC decoding is a maximum of 42,62 ms A shorter latency is acceptable when synchronization is not required For synchronization (for example, with video), recommended value of latency is 42,62 ms 5.2.3 The data MPEG-2 AAC half-rate low the sampling frequency A shorter latency is acceptable when synchronization is not required The stream of the data-bursts for MPEG-2 AAC half-rate low sampling frequency consists of sequences MPEG-2 AACAAC lowhalf-rate samplinglow frequency frames The data-type of an 5.2.3 Theofdata MPEG-2 samplingADTS frequency MPEG-2 AAC low sampling frequency data-burst is 19; and the subdata type of an MPEGThe stream of the for MPEG-2 lowissampling frequency consists of AAC half-rate lowdata-bursts sampling frequency is 0.AAC Thehalf-rate data-burst headed with a burst-preamble, sequences AAC low frequency ADTSThe frames The data-type an followed by of theMPEG-2 burst-payload, andsampling stuffed with stuffing bits burst-payload of each of dataMPEG-2 AACMPEG-2 low sampling frequency is 19; and data the subdata type one of ancomplete MPEGburst of the AAC half-rate lowdata-burst sampling frequency shall contain AAC half-rate low sampling frequency is TheADTS data-burst headed with a burst-preamble, MPEG-2 AAC half-rate low sampling frequency frame,is and represents 048 samples followed the burst-payload, stuffed with stuffingAAC bits half-rate The burst-payload of each datafor each by encoded channel Theand length of the MPEG-2 low sampling frequency burst of thedepends MPEG-2onAAC lowrate sampling data contain complete data-burst the half-rate encoded bit (whichfrequency determines the shall MPEG-2 AACone half-rate low MPEG-2 half-rate low frame sampling frequency ADTS frame, and represents for 048 sampling AAC frequency ADTS length) The reference to the specification thesamples MPEGforAAC eachhalf-rate encodedlow channel Thefrequency length of bitstream, the MPEG-2 AAC half-rate lowsamples samplingoffrequency sampling representing 048 encoded data-burst depends encoded bit rate (which determines the MPEG-2 AAC half-rate low audio per frame mayon bethe found in ISO/IEC 13818-7 sampling frequency ADTS frame length) The reference to the specification for the MPEG2 AAC half-rate lowMPEG-2 sampling frequency samples of sample encoded AAC low rate AAC low sample rate bitstream, representing 048MPEG-2 Pa per Pb frame Pc Pd Pa Pb Pc Pd audio may be burst_payload found in ISO/IEC 13818-7 burst_payload Bit of Pa Bit of Pa MPEG-2 AAC low sample rate Pa Pb Pc Pa Pb Pc Pd burst_payload AAC frame Stuffing Bit of Pa Bit of Pa Regular rate of the MPEG-2 AAC frames AAC frame Stuffing Repetition period of the burst Regular rate of the MPEG-2 AAC frames Pd MPEG-2 AAC low sample rate burst_payload AAC frame AAC frame Figure – MPEG-2 half-rate low sampling frequency data-burst Repetition period ofAAC the burst The data-type-dependent information for the –MPEG-2 AAC half-rate low sampling is 4– 61937-6 Amend frequency © IEC:2014 Figure given in Table – MPEG-2 AAC half-rate low sampling frequency data-burst Data-type-dependent information for data-type  Table –information The data-type-dependent for the MPEG-2 AAC low sampling frequency is Table – Data-type-dependent information for half-rate data-type MPEG-2 AAC MPEG-2 AAC half-rate low sampling frequency given in Table half-rate low sampling frequency Bits of Pc Bits of Pc Table Value LSB MSB Value Contents – Data-type-dependent information for data-type MPEG-2 AAC Contents half-rate low sampling frequency LSB MSB 8-12 00 8-12 Bits of Pc 01 Value LC profile No indication Contents Reserved LC profile LSB MSB 8-12 02 No indication 2, 03 Reserved for future profile LC profile with MPEG Surround No indication LC profile with SBR LC profile with SBR LC profile 04 2, 05,06 5-31 07 Reserved Reserved for future profile LC profile with SBR and MPEG Surround LC profile with SBR The reference point of an MPEG-2 AAC half-rate low sampling frequency data-burst is bit of 08-31 Reserved Pa and occurs exactly once every 048 sampling 5-31 Reserved periods The data-burst containing the   The reference point of an MPEG-2 AAC half-rate low sampling frequency data-burst is bit of Pa andThe occurs 048 sampling periods The data-burst containing the 5.2.5 dataexactly MPEG-2once AACevery quarter-rate low sampling frequency Replace the entire existing Table by the following new Table 8: Table – Data-type-dependent information for data-type BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 12 – 11 – EN 61937-6:2006 MPEG-2 AAC half-rate low sampling frequency frames shall occur at a regular rate, with the reference point of each MPEG-2 AAC half-rate low sampling frequency data-burst beginning 048 IEC 60958 frames after the reference point of the preceding MPEG-2 AAC half-rate low sampling frequency data-burst (of the same bitstream number) It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-2 AAC half-rate low sampling frequency bitstream as described in IEC 61937, and that pause databursts be transmitted with a repetition period of 64 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 64 IEC 60958 frames) or to meet the requirement on burst spacing (see IEC 61937) When a stream gap in an MPEG-2 AAC half-rate low sampling frequency stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 048 sampling periods following the Pa of the previous MPEG-2 AAC half-rate low sampling frequency 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 close as possible to, considering the 64 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG-2 AAC half-rate low sampling frequency data-burst which follows the stream gap The gap-length parameter contained in the pause data-burst is intended to be interpreted by the MPEG-2 AAC half-rate low sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.4 Latency of MPEG-2 AAC half-rate low sampling frequency decoding The latency of an external audio decoder to decode the MPEG-2 AAC half-rate low sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-2 AAC low sample rate burst_payload MPEG-2 AAC frame Pa Pb Pc Pd Stuffing Bit of Pa MPEG-2 AAC low sample rate burst_payload MPEG-2 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-2 AAC low sampling frequency decoder Figure – Latency of MPEG-2 AAC half-rate low sampling frequency decoding EXAMPLE The receiving delay time to receive a whole data-burst with maximum length is calculated as follows The length of the preamble is 64 bits The maximum length of the whole data-burst payload is 096 bits in the Japanese satellite DTV specified maximum bit rate of 96 kbit/s In this case, the maximum length of data-bursts is 096 bits The receiving delay time is calculated as 2,667 ms in the case of 48 kHz sampling frequency The decoding delay time is calculated as 42,667 ms It is equal to the decoding time for one MPEG-2 AAC halfrate low sampling frequency frame data Hence, the latency of MPEG-2 AAC half-rate low sampling frequency decoding is approximately 45,333 ms The absolute maximum length of data-burst is calculated as follows In order to make a burst, a minimum stuffing consists of stuffing words (Pz of 16 bits) per burst The repetition period of data-burst in IEC 60958 frames is 048 Therefore, the maximum length of data-burst leads to 048 sample * ch * 16 bit – word * 16 bit = 65 472 bits The receiving delay time is calculated as 42,625 ms in the case of 48 kHz sampling frequency (65 472/1 536 000 = 0,042 625) The decoding delay time is 42,667 ms as above Hence, the latency of the MPEG2 AAC half-rate low sampling frequency decoding is a maximum of 85,29 ms - 13 – 12 – EN 61937-6:2006 BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 For synchronization (for example, with video), the recommended value of latency is 85,29 ms EN 61937-6:2006 – 12 – A shorter latency is acceptable when synchronization is not required For synchronization (for example, with video), low the recommended value of latency is 85,29 ms 5.2.5 The data MPEG-2 AAC quarter-rate sampling frequency A shorter latency is acceptable when synchronization is not required The stream of the data-bursts for the MPEG-2 AAC quarter-rate low sampling frequency consists of sequences of theAAC MPEG-2 AAC quarter-rate low sampling frequency ADTS frames 5.2.5 The data MPEG-2 quarter-rate low sampling frequency The data-type of an MPEG-2 AAC quarter-rate low sampling frequency data-burst is 19 and the subdata of an MPEG-2 AAC quarter-rate frequency is The data-burst The stream type of the data-bursts for the MPEG-2 low AACsampling quarter-rate low sampling frequency is headedofwith a burst-preamble, followed the burst-payload, and stuffed withADTS stuffing bits consists sequences of the MPEG-2 AACby quarter-rate low sampling frequency frames The burst-payload of each data-burst of the MPEG-2 AAC quarter-rate low sampling The data-type of an MPEG-2 AAC quarter-rate low sampling frequency data-burst is 19 and frequency data contain oneAAC complete MPEG-2 quarter-rate low sampling frequency the subdata typeshall of an MPEG-2 quarter-rate sampling frequency is The – – lowAAC 61937-6 Amend ©data-burst IEC:2014 ADTS frame, and represents 096 samples for each encoded channel The length of bits the is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing MPEG-2 AAC quarter-rate low sampling frequency data-burst depends on the encoded bit The burst-payload of each data-burst of the MPEG-2 AAC quarter-rate low sampling Table 7the – Data-type-dependent information for data-type rate (whichdata determines MPEG-2 AAC quarter-rate sampling frequency ADTS frame frequency shall contain one complete MPEG-2 AAClow quarter-rate low sampling frequency MPEG-2 half-rate low sampling frequency length) The reference to the 4AAC specification MPEG-2 AACchannel quarter-rate sampling ADTS frame, and represents 096 samplesforforthe each encoded The low length of the frequencyAAC bitstream, representing 096 samples of encoded audio per frame be found bit in MPEG-2 quarter-rate low sampling frequency data-burst depends on may the encoded Bits of13818-7 Pc Value Contents ISO/IEC rate (which determines the MPEG-2 AAC quarter-rate low sampling frequency ADTS frame LSB MSB length) The reference to the specification for the MPEG-2 AAC quarter-rate low sampling 8-12 00 representing No4indication frequency bitstream, 096 samples of encoded audio per MPEG-2 frame may AAC be low found samplein MPEG-2 AAC low sample Pa Pb Pc Pd Pa Pb Pc Pd ISO/IEC 13818-7.01 LC profile rate burst_payload rate burst_payload 02 Reserved Bit of Pa Bit of Pa MPEG-2 AAC low sample MPEG-2 AAC low sample LC profile with MPEG Surround Pa Pb Pc Pd Pa Pb Pc Pd03 rateAAC burst_payload rate burst_payload AAC frame stuffing frame 04 LC profile with SBR Bit of Pa Bit of Pa Regular rate05,06 of the MPEG-2 AAC frames Reserved AAC frame stuffing 07 LC profile with SBR and MPEG Surround Repetition period of the burst 08-31 AAC frame Reserved Regular rate of the MPEG-2 AAC frames Figure – MPEG-2 low sampling frequency data-burst Repetition period AAC of thequarter-rate burst 5.2.5 The data MPEG-2 AAC quarter-rate low sampling frequency The data-type-dependent information for MPEG-2 AAC quarter-rate low sampling frequency is Figure MPEG-2 AAC8 quarter-rate low new sampling frequency data-burst given in Table 8.5 –existing Replace the entire Table by the following Table 8: The data-type-dependent for MPEG-2 AAC quarter-rate low sampling frequency is Table – Data-type-dependent information for data-type MPEG-2 AAC 8Table –information Data-type-dependent information for data-type given in Table quarter-rate low sampling frequency MPEG-2 AAC quarter-rate low sampling frequency Bits of Pc Value Contents Bits of Pc Value Table – Data-type-dependent information forContents data-type LSB MSB quarter-rate low sampling frequency LSB MSB 8-12 00 No indication 8-12 No indication Bits of Pc Value Contents 01 LC profile LC profile LSB MSB 02 Reserved 2, Reserved for future profile 8-12 No indication 03 LC profile with MPEG Surround LC profile with SBR LC profile 04 LC profile with SBR 5-31 Reserved 2, Reserved for future profile 05,06 Reserved LC profile with SBR 07 LC profile with SBR and MPEG Surround MPEG-2 AAC The reference point of a MPEG-2 AAC quarter-rate 5-31 Reservedlow sampling frequency data-burst is bit 08-31 Reserved  exactly of Pa and occur once every 096 sampling periods The data-burst containing MPEG-  AAC quarter-rate low sampling frequency frames shall occur at a regular rate, with the reference point of ofeach MPEG-2 AAC quarter-rate low sampling frequency data-burst The reference point a MPEG-2 AAC quarter-rate low sampling frequency data-burst is bit 5.2.7 Theoccur MPEG-4 AAC beginning 4data 096 exactly IEC 60958 frames the reference point of data-burst the preceding MPEG-2 AAC of Pa and once every 4after 096 sampling periods The containing MPEGquarter-rate low sampling frequencyfrequency data-burstframes (of the shall sameoccur bitstream AAC quarter-rate low sampling at anumber) regular rate, with the Replace the entire existing Table by the following new Table 9: reference point of each MPEG-2 AAC quarter-rate low sampling frequency data-burst beginning 096 IEC 60958 frames after the reference point of the preceding MPEG-2 AAC quarter-rate low sampling frequency data-burst (of the same bitstream number) BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 14 – 13 – EN 61937-6:2006 It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-2 AAC quarter-rate low sampling frequency bitstream as described in IEC 61937, and that pause data-bursts be transmitted with a repetition period of 128 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 128 IEC 60958 frames), or to meet the requirement on burst spacing (see IEC 61937) When a stream gap in an MPEG-2 AAC quarter-rate low sampling frequency stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 096 sampling periods following the Pa of the previous MPEG-2 AAC quarter-rate low sampling frequency 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 close as possible to, considering the 64 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG2 AAC quarter-rate low sampling frequency data-burst which follows the stream gap The gaplength parameter contained in the pause data-burst is intended to be interpreted by the MPEG-2 AAC quarter-rate low sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.6 Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding The latency of an external audio decoder to decode MPEG-2 AAC quarter-rate low sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-2 AAC low sample rate burst_payload MPEG-2 AAC frame Pa Pb Pc Pd Stuffing Bit of Pa MPEG-2 AAC low sample rate burst_payload MPEG-2 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-2 AAC low sampling frequency decoder Figure – Latency of MPEG-2 AAC quarter-rate low sampling frequency decoding The absolute maximum length of data-burst is calculated as follows In order to make a burst, a minimum stuffing consists of stuffing words (Pz of 16 bit) per burst The repetition period of data-burst in IEC 60958 frames is 096 Therefore, the maximum length of a data-burst leads to 096 sample * ch * 16 bit – word * 16 bit =131 008 bit The receiving delay time is calculated as 85,29 ms in the case of the 48 kHz sampling frequency (131 008/1 536 000 = 0,085 29) The decoding delay time is 85,33 ms as above Hence, the latency of MPEG2 AAC quarter-rate low sampling frequency decoding is a maximum of 170,62 ms For synchronization (for example, with video), the recommended value of latency is 170,62 ms A shorter latency is acceptable when synchronization is not required 5.2.7 The data MPEG-4 AAC The stream of the data-bursts for MPEG-4 AAC consists of sequences of MPEG-4 AAC ADTS frames The data-type of a MPEG-4 AAC data-burst is 20 And the subdata type of an MPEG4 AAC is 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 MPEG-4 AAC data shall contain one complete MPEG-4 AAC ADTS frame and represents 024 samples for each encoded channel The length of the MPEG-4 AAC data-burst depends on the encoded bit rate (which determines the MPEG-4 AAC ADTS frame length) The reference to the specification for the MPEG-4 AAC bitstream, representing 024 samples of encoded audio per frame, is found in ISO/IEC 14496-3 EN 61937-6:2006 Pa Pb Pc Pd – 14 – - 15 - MPEG-4 AAC burst_payload BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 Pa Pb Pc Pd MPEG-4 AAC burst_payload Bit of Pa Bit of Pa AAC frame Stuffing AAC frame EN 61937-6:2006 Regular rate of the MPEG-4 AAC frames – 14 – Repetition period of the burst Figure MPEG-4 AAC – MPEG-4 AAC data-burst MPEG-4 AAC Pa Pb Pc Pd burst_payload burst_payload 61937-6 Amend © IEC:2014 – – AAC is given in Table The information for MPEG-4 Bit of Pa Bit 0data-type-dependent of Pa Pa Pb Pc Pd AAC frame Stuffing AAC frame  Table – Data-type-dependent information for data-type MPEG-4 AAC Regular rate of the MPEG-4 AAC frames Contents Bits of Pc Value Value Contents Bits of Pc LSB MSB LSB MSB Repetition period of the burst 8-12 00 No indication 8-12 00 No indication 01 AAC profile, format for transmission is ADTS 01 AAC AAC profile,data-burst format for transmission is ADTS Figure – MPEG-4 02 Reserved 02, 03 Reserved for future profile 03 AAC profile with MPEG Surround, format for transmission is ADTS, MPEG The data-type-dependent information for MPEG-4 AAC is given in 04 HE-AAC profile, format forTable transmission is ADTS Surround data complies to MPEG Surround baseline profile 05-3104 HE-AAC profile,Reserved format for transmission is ADTS Table – Data-type-dependent information for data-type MPEG-4 AAC 05 Reserved 13 02, 03 Reserved The point of an MPEG-4 AAC data-burst bit offormat Pa and occurs exactly Bits reference of Pc Value Contents 06 HE-AAC profile with MPEGisSurround, for transmission is ADTS,once every 024 sampling periods The data-burst containing MPEG-4 AAC frames shall occur at MPEG Surround data complies to MPEG Surround baseline profile LSB MSB a regular rate, with the reference point of each MPEG-4 AAC data-burst beginning 024 Reserved 8-12 60958 frames 00 07-11 No the indication IEC after the reference point of preceding MPEG-4 AAC data-burst (of the 12 HE-AAC V2 profile, format transmission is ADTS.is ADTS same bitstream number) 01 AAC profile,for format for transmission Reserved for future profile It is recommended that pause data-bursts used fill stream gaps infor the MPEG-4 is AAC bitHE-AAC V2 are profile with to MPEG transmission ADTS, 04 14 HE-AAC profile,Surround, format forformat transmission is ADTS stream as described in IEC 61937 andSurround that pause data-bursts be Surround transmitted withprofile a repetition MPEG data complies to MPEG baseline period of 32 05-31 IEC 60958 frames, except whenReserved other repetition periods are necessary to fill the 15-31 Reserved precise stream gap length (which may not be a multiple of 32 IEC 60958 frames) or to meet  the requirement on burst spacing (see IEC 61937) The reference point of an MPEG-4 AAC data-burst is bit of Pa and occurs exactly once every 024data sampling periods The data-burst containing MPEG-4 AAC frames shall occur at 5.2.9 The MPEG-4 AAC half-rate low sampling frequency When a stream anreference MPEG-4 AAC is filled by aAAC sequence of pause data-bursts, a regular rate, gap with in the pointstream of each MPEG-4 data-burst beginning 024 the Pa of the first pause data-burst shall be located 024 sampling periods following Pa IEC 60958 after theTable reference of the preceding MPEG-4 AAC data-burst the (of the Replace theframes entire existing 10 bypoint the following new Table 10: of the previous MPEG-4 AAC frame It is recommended that the sequence(s) of pause datasame bitstream number) bursts which fill the stream gap should continue from this point up to (as close as possible to, Table – Data-type-dependent information for data-type considering the 32 IEC 10 60958 frame length of the pause data-burst) the Pa of the first MPEGIt is recommended thatMPEG-4 pause data-bursts aregap used to fill stream gaps in the MPEG-4 AAC AAC low The sampling frequency AAC data-burst which follows the half-rate stream gap-length parameter contained in bitthe stream as described in IEC 61937 and that pause data-bursts be transmitted with a repetition pause data-burst is intended to be interpreted by the MPEG-4 AAC decoder as an indication period of 60958 frames, except when repetition periods necessary fill the Bitsnumber of 32 Pc IEC Value Contents of the of decoded PCM samples whichother are missing (due to the are resulting audiotogap) LSB MSB precise stream gap length (which may not be a multiple of 32 IEC 60958 frames) or to meet the requirement on (see IEC 61937) 8-12 00 burst spacingNo indication 5.2.8 Latency of MPEG-4 AAC decoding 01 AAC profile, format for transmission is ADTS When a stream gap in an MPEG-4 AAC stream is filled by a AAC sequence of pause The latency of an external audio Reserved decoder to decode MPEG-4 is defined as thedata-bursts, sum of the 02pause data-burst the Pa of the first shall be located 024 sampling periods following the Pa receiving delay time and the decoding delay time of the previous MPEG-4 AAC frame It is with recommended thatformat the sequence(s) pauseMPEG data03 AAC profile MPEG Surround, for transmission of is ADTS, Surroundcontinue data complies MPEG Surround profile bursts which fill the stream gap should fromto this point up tobaseline (as close as possible to, considering the 32 length of format the pause data-burst) the Pa of the first MPEG04 IEC 60958 frame HE-AAC profile, for transmission is ADTS AAC data-burst which follows the stream gap The gap-length parameter contained in the pause data-burst05is intended to Reserved be interpreted by the MPEG-4 AAC decoder as an indication HE-AAC profile with MPEG Surround, transmission is ADTS, of the number of 06 decoded PCM samples which are missing (dueformat to theforresulting audio gap) MPEG Surround data complies to MPEG Surround baseline profile 5.2.8 Latency07-11 of MPEG-4 12 Reserved AAC decoding HE-AAC V2 profile, format for transmission is ADTS The latency of an external audio decoder to decode MPEG-4 AAC is defined as the sum of the 13 and the decoding Reserved receiving delay time delay time the Pa of the first pause data-burst shall be located 024 sampling periods following the Pa of the previous MPEG-4 AAC frame It is recommended that the sequence(s) of pause databursts which fill the stream gap should continue from this point up to (as close as possible to, considering the 32 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEGBS EN 61937-6:2006+A1:2014 AAC data-burst which follows the stream gap The gap-length parameter contained in the IEC 61937-6:2006+A1:2014 - 16 pause data-burst is intended to be interpreted by the MPEG-4 AAC decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.8 Latency of MPEG-4 AAC decoding The latency of an external audio decoder to decode MPEG-4 AAC is defined as the sum of the EN 61937-6:2006 15 – receiving delay time and the decoding delay–time Pa Pb Pc Pd Bit of Pa MPEG-4 AAC burst-payload MPEG-4 AAC frame MPEG-4 AAC Burst-payload Pa Pb Pc Pd Stuffing Bit of Pa MPEG-4 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-4 AAC decoder Figure – Latency of MPEG-4 AAC decoding The absolute maximum length of the data-burst is calculated as follows In order to make a burst, a minimum stuffing consists of stuffing words (Pz of 16 bit) per burst The repetition period of data-burst in IEC 60958 frames is 024 Therefore, the maximum length of data-burst leads to 024 sample * ch * 16 bit – word * 16 bit = 32 704 bits The receiving delay time is calculated as 21,29 ms in the case of the 48 kHz sampling frequency (32 704/1 36 000 = 0,021 9) The decoding delay time is 21,33 ms as above Hence, the latency of MPEG-4 AAC decoding is a maximum of 42,62 ms For synchronization (for example, with video), the recommended value of latency is 42,62 ms A shorter latency is acceptable when synchronization is not required 5.2.9 The data MPEG-4 AAC half-rate low sampling frequency The stream of the data-bursts for MPEG-4 AAC half-rate low sampling frequency consists of sequences of MPEG-4 AAC low sampling frequency ADTS frames The data-type of an MPEG-4 AAC low sampling frequency data-burst is 20 and the subdata type of an MPEG4 AAC half-rate low sampling frequency is The data-burst is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits The burst-payload of each databurst of MPEG-4 AAC half-rate low sampling frequency data shall contain one complete MPEG-4 AAC half-rate low sampling frequency ADTS frame and represents 048 samples for each encoded channel The length of the MPEG-4 AAC half-rate low sampling frequency data-burst depends on the encoded bit rate (which determines the MPEG-4 AAC half-rate low sampling frequency ADTS frame length) The reference to the specification for the MPEG4 AAC half-rate low sampling frequency bitstream, representing 048 samples of encoded audio per frame is found in ISO/IEC 14496-3 Pa Pb Pc Pd MPEG-4 AAC low sample rate Pa Pb Pc Pd burst_payload MPEG-4 AAC low sample rate burst_payload Bit of Pa Bit of Pa AAC frame Stuffing AAC frame Regular rate of the MPEG-4 AAC frames Repetition period of the burst Figure – MPEG-4 AAC half-rate low sampling frequency data-burst The data-type-dependent information for MPEG-4 AAC half-rate low sampling frequency is given in Table 10 Reserved Regular rate13of the MPEG-4 AAC frames 14 HE-AAC V2 profile with MPEG Surround, format for transmission is ADTS, MPEG Surround data complies to MPEG Surround baseline profile Repetition period of the burst BS EN 61937-6:2006+A1:2014 15-31 Reserved IEC 61937-6:2006+A1:2014 - 17 - Figure – MPEG-4 AAC half-rate low sampling frequency data-burst 5.2.9 The data MPEG-4 AAC half-rate low sampling frequency The data-type-dependent information for MPEG-4 AAC half-rate low sampling frequency is given in Table 10 existing Table 10 by the following new Table 10: Replace the entire  Table 10 – Data-type-dependent information for data-type MPEG-4 AAC half-rate low sampling frequency Bits of Pc LSB MSB Value 8-12 Contents 00 No indication 01 AAC profile, format for transmission is ADTS 02 Reserved 03 AAC profile with MPEG Surround, format for transmission is ADTS, MPEG Surround data complies to MPEG Surround baseline profile EN 61937-6:2006 – 16 – Table 10 – Data-type-dependent information for data-type MPEG-4 AAC 04 HE-AAC profile, format for transmission is ADTS half-rate low sampling frequency 05 Bits of Pc Reserved Value 06 HE-AAC profile Contents with MPEG Surround, format for transmission is ADTS, MPEG Surround data complies to MPEG Surround baseline profile LSB MSB 8-12 2, 07-11 12 13 14 5-31 15-31  Reserved No indication HE-AAC V2 profile, format for transmission is ADTS AAC profile, Format for transmission is ADTS Reserved Reserved for future profile HE-AAC V2 profile with MPEG Surround, format for transmission is ADTS, HE-AAC profile, format for transmission is ADTS MPEG Surround data complies to MPEG Surround baseline profile Reserved Reserved  The reference point of an MPEG-4 AAC half-rate low sampling frequency data-burst is bit of 5.2.11 The data MPEG-4 quarter-rate low sampling frequency Pa and occurs exactly onceAAC every 048 sampling periods The data-burst containing MPEG4 AAC half-rate low sampling frequency frames shall occur at a regular rate, with the Replace entire Table 11 by half-rate the following new Tablefrequency 11: referencethe point of existing each MPEG-4 AAC low sampling data-burst beginning 048 IEC 60958 frames after the reference point of the preceding MPEG-4 AAC half-rate low sampling frequency data-burst (of the same bitstream number) It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-4 AAC half-rate low sampling frequency bitstream, as described in IEC 61937, and that pause databursts be transmitted with a repetition period of 64 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 64 IEC 60958 frames) or to meet the requirement on burst spacing (see IEC 61937) When a stream gap in an MPEG-4 AAC half-rate low sampling frequency stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 048 sampling periods following the Pa of the previous MPEG-4 AAC half-rate low sampling frequency 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 close as possible to, considering the 64 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG-4 AAC half-rate low sampling frequency data-burst which follows the stream gap The gap-length parameter contained in the pause data-burst is intended to be interpreted by the MPEG-4 AAC half-rate low sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.10 Latency of MPEG-4 AAC half-rate low sampling frequency decoding The latency of an external audio decoder to decode MPEG-4 AAC half-rate low sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame Pa Pb Pc Pd Stuffing Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame low sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.10 Latency of MPEG-4 AAC half-rate low sampling frequency decoding BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 18 - The latency of an external audio decoder to decode MPEG-4 AAC half-rate low sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-4 AAC low sample rate burst_payload Pa Pb Pc Pd MPEG-4 AAC frame Stuffing Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-4 AAC decoder EN 61937-6:2006 – 17 – low sampling frequency Figure – Latency of MPEG-4 AAC half-rate decoding The absolute maximum length of the data-burst is calculated as follows In order to make a burst, a minimum stuffing consists of stuffing words (Pz of 16 bit) per burst The repetition period of data-burst in IEC 60958 frames is 048 Therefore, the maximum length of data-burst leads to 048 sample * ch * 16 bit – word * 16 bit = 65 472 bits The receiving delay time is calculated as 42,625 ms in the case of 48 kHz sampling frequency (65 472/1 536 000 = 0,042 625) The decoding delay time is 42,667 ms as above Hence, the latency of MPEG2 AAC half-rate low sampling frequency decoding is a maximum of 85,29 ms For synchronization (for example, with video), the recommended value of latency is 85,29 ms A shorter latency is acceptable when synchronization is not required 5.2.11 The data MPEG-4 AAC quarter-rate low sampling frequency The stream of the data-bursts for MPEG-4 AAC quarter-rate low sampling frequency consists of sequences of MPEG-4 AAC quarter-rate low sampling frequency ADTS frames The datatype of a MPEG-4 AAC quarter-rate low sampling frequency data-burst is 20 and the subdata type of a MPEG-4 AAC quarter-rate low sampling frequency is The data-burst is headed with a burst-preamble, followed by the burst-payload, and stuffed with stuffing bits The burstpayload of each data-burst of MPEG-4 AAC quarter-rate low sampling frequency data shall contain one complete MPEG-4 AAC quarter-rate low sampling frequency ADTS frame, and represents 096 samples for each encoded channel The length of the MPEG-4 AAC quarterrate low sampling frequency data-burst depends on the encoded bit rate (which determines the MPEG-4 AAC quarter-rate low sampling frequency ADTS frame length) The reference to the specification for the MPEG-4 AAC quarter-rate low sampling frequency bit stream, representing 096 samples of encoded audio per frame is found in ISO/IEC 14496-3 Pa Pb Pc Pd MPEG-4 AAC low sample rate burst_payload Pa Pb Pc Pd MPEG-4 AAC low sample rate burst_payload Bit of Pa Bit of Pa AAC frame Stuffing AAC frame Regular rate of the MPEG-4 AAC frames Repetition period of the burst Figure 10 – MPEG-4 AAC quarter-rate low sampling frequency data-burst The data-type-dependent information for MPEG-4 AAC quarter-rate low sampling frequency is given in Table 11 Table 11 – Data-type-dependent information for data-type MPEG-4 AAC quarter-rate low sampling frequency Bits of Pc Value Contents No indication LSB MSB 8-12 BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 19 –6– 61937-6 Amend © IEC:2014 Table 11 – Data-type-dependent information for data-type MPEG-4 AAC quarter-rate low sampling frequency Bits of Pc LSB MSB 8-12 Value Contents 00 No indication 01 AAC profile, format for transmission is ADTS 02 Reserved for future profile 03 AAC profile with MPEG Surround, format for transmission is ADTS, MPEG Surround data complies to MPEG Surround baseline profile 04 HE-AAC profile, format for transmission is ADTS 05 Reserved 06 HE-AAC profile with MPEG Surround, format for transmission is ADTS, MPEG Surround data complies to MPEG Surround baseline profile 07-11 Reserved 12 HE-AAC V2 profile, format for transmission is ADTS 13 Reserved 14 HE-AAC V2 profile with MPEG Surround, format for transmission is ADTS, MPEG Surround data complies to MPEG Surround baseline profile EN 61937-6:2006  15-31 Reserved – 18 –  The reference point of a MPEG-4 AAC quarter-rate low sampling frequency data-burst is bit of Pa and occurs exactly once every 096 sampling periods The data-burst containing MPEG-4 AAC quarter-rate low sampling frequency frames shall occur at a regular rate, with the reference point of each MPEG-4 AAC quarter-rate low sampling frequency data-burst _ beginning 096 IEC 60958 frames after the reference point of the preceding MPEG-4 AAC quarter-rate low sampling frequency data-burst (of the same bitstream number) It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-4 AAC quarter-rate low sampling frequency bitstream as described in IEC 61937, and that pause data-bursts be transmitted with a repetition period of 64 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 128 IEC 60958 frames) or to meet the requirement on burst spacing (see IEC 61937) When a stream gap in an MPEG-4 AAC quarter-rate low sampling frequency stream is filled by a sequence of pause data-bursts, the Pa of the first pause data-burst shall be located 096 sampling periods following the Pa of the previous MPEG-4 AAC quarter-rate low sampling frequency 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 close as possible to, considering the 128 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG-4 AAC quarter-rate low sampling frequency data-burst which follows the stream gap The gap-length parameter contained in the pause data-burst is intended to be interpreted by the MPEG-4 AAC quarter-rate low sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.12 Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding The latency of an external audio decoder to decode MPEG-4 AAC quarter-rate low sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame Pa Pb Pc Pd Stuffing Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame Repetition period of the burst Receiving delay Decoding delay the MPEG-4 AAC quarter-rate low sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) BS EN 61937-6:2006+A1:2014 5.2.12 Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding IEC 61937-6:2006+A1:2014 - 20 The latency of an external audio decoder to decode MPEG-4 AAC quarter-rate low sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame Pa Pb Pc Pd Stuffing Bit of Pa MPEG-4 AAC low sample rate burst_payload MPEG-4 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-4 AAC low sampling frequency decoder Figure 11 – Latency of MPEG-4 AAC quarter-rate low sampling frequency decoding The absolute maximum length of data-burst is calculated as follows In order to make burst, a minimum stuffing consists of stuffing words (Pz of 16 bit) per burst The repetition period of data-burst in IEC 60958 frames is 096 Therefore, the maximum length of data-burst leads to 096 sample * ch * 16 bit – word * 16 bit =131 008 bit The receiving delay time is calculated as 85,29 ms in the case of the 48 kHz sampling frequency (131 008/1 536 000 = 0,085 29) The decoding delay time is 85,33 ms as above Hence, the latency of MPEG4 AAC quarter-rate low sampling frequency decoding is a maximum of 170,62 ms For synchronization (for example, with video), the recommended value of latency is 170,62 ms A shorter latency is acceptable when EN 61937-6:2006 – 19 –synchronization is not required 5.2.13 The data MPEG-4 AAC double-rate high sampling frequency The stream of the data-bursts for MPEG-4 AAC double-rate high sampling frequency consists of sequences of MPEG-4 AAC double-rate high sampling frequency ADTS frames The datatype of an MPEG-4 AAC double-rate high sampling frequency data-burst is 20, and the subdata type of an MPEG-4 AAC double-rate high sampling frequency is 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 the MPEG-4 AAC double-rate high sampling frequency data shall contain one complete MPEG-4 AAC double-rate high sampling frequency ADTS frame, and represents 096 samples for each encoded channel The length of the MPEG-4 AAC double-rate high sampling frequency data-burst depends on the encoded bit rate (which determines the MPEG-4 AAC double-rate high sampling frequency ADTS frame length) The reference to the specification for the MPEG-4 AAC double-rate high sampling frequency bit stream, representing 512 samples of encoded audio per frame may be found in ISO/IEC 14496-3 Pa Pb Pc Pd MPEG-4 AAC high sample rate burst_payload Pa Pb Pc Pd MPEG-4 AAC high sample rate burst_payload Bit of Pa Bit of Pa AAC frame Stuffing AAC frame Regular rate of the MPEG-4 AAC frames Repetition period of the burst Figure 12 – MPEG-4 AAC double-rate high sampling frequency data-burst The data-type-dependent information for the MPEG-4 AAC double-rate high sampling frequency is given in Table 12 Table 12 – Data-type-dependent information for data-type MPEG-4 AAC double-rate high sampling frequency Bits of Pc Value Contents Repetition period of the burst Figure 12 – MPEG-4 AAC double-rate high sampling frequency data-burst BS EN 61937-6:2006+A1:2014 IEC 61937-6:2006+A1:2014 - 21 The data-type-dependent information for the MPEG-4 AAC double-rate high sampling frequency is given in Table 12 Table 12 – Data-type-dependent information for data-type MPEG-4 AAC double-rate high sampling frequency Bits of Pc Value Contents No indication AAC profile, format for transmission is ADTS 2, Reserved for future profile HE-AAC profile, format for transmission is ADTS 5-31 Reserved LSB MSB 8-12 The reference point of an MPEG-4 AAC double-rate high sampling frequency data-burst is bit of Pa and occurs exactly once every 512 sampling periods The data-burst containing the MPEG-4 AAC double-rate high sampling frequency frames shall occur at a regular rate, with the reference point of each MPEG-4 AAC double-rate high sampling frequency data-burst beginning 512 IEC 60958 frames after the reference point of the preceding MPEG-4 AAC double-rate high sampling frequency data-burst (of the same bitstream number) It is recommended that pause data-bursts are used to fill stream gaps in the MPEG-4 AAC double-rate high sampling frequency bit stream as described in IEC 61937, and that pause data-bursts be transmitted with a repetition period of 16 IEC 60958 frames, except when other repetition periods are necessary to fill the precise stream gap length (which may not be a multiple of 16 IEC 60958 frames) or to meet the requirement on burst spacing (see EN 61937-6:2006 – 20 – IEC 61937) When a stream gap in an MPEG-4 AAC double-rate high sampling frequency stream 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 MPEG-4 AAC double-rate high sampling frequency 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 close as possible to, considering the 16 IEC 60958 frame length of the pause data-burst) the Pa of the first MPEG-4 AAC double-rate high sampling frequency data-burst which follows the stream gap The gap-length parameter contained in the pause data-burst is intended to be interpreted by the MPEG-4 AAC doublerate high sampling frequency decoder as an indication of the number of decoded PCM samples which are missing (due to the resulting audio gap) 5.2.14 Latency of MPEG-4 AAC double-rate high sampling frequency decoding The latency of an external audio decoder to decode MPEG-4 AAC double-rate high sampling frequency is defined as the sum of the receiving delay time and the decoding delay time Pa Pb Pc Pd Bit of Pa MPEG-4 AAC high sample rate burst_payload MPEG-4 AAC frame Pa Pb Pc Pd Stuffing Bit of Pa MPEG-4 AAC high sample rate burst_payload MPEG-4 AAC frame Repetition period of the burst Receiving delay Decoding delay Latency of MPEG-4 AAC high sampling frequency decoder Figure 13 – Latency of MPEG-4 AAC double-rate high sampling frequency decoding The absolute maximum length of data-burst is calculated as follows In order to make burst, a minimum stuffing consists of stuffing words (Pz of 16 bit) per burst The repetition period of data-burst in IEC 60958 frames is 512 Therefore, the maximum length of data-burst leads to 512 sample * ch * 16 bit – word * 16 bit = 16 320 bit The receiving delay time is calculated as 10,63 ms in the case of the 48 kHz sampling frequency (16 320/1 536 000 = 0,010 625) The