ETSI TS 101 980 V1.1.1 (2001-09) Technical Specification Digital Radio Mondiale (DRM); System Specification 2 ETSI TS 101 980 V1.1.1 (2001-09) Reference DTS/JTC-DRM-01 Keywords broadcasting, digital, DRM, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. 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ETSI 3 ETSI TS 101 980 V1.1.1 (2001-09) Contents Intellectual Property Rights................................................................................................................................7 Foreword.............................................................................................................................................................7 Introduction ........................................................................................................................................................7 1 Scope ........................................................................................................................................................9 2 References ................................................................................................................................................9 3 Definitions, symbols and abbreviations ...................................................................................................9 3.1 Definitions..........................................................................................................................................................9 3.2 Symbols............................................................................................................................................................10 3.3 Abbreviations ...................................................................................................................................................11 4 General characteristics ...........................................................................................................................12 4.1 System overview ..............................................................................................................................................12 4.2 System architecture ..........................................................................................................................................12 4.3 Source coding...................................................................................................................................................14 4.4 Transmission modes.........................................................................................................................................15 4.4.1 Signal bandwidth related parameters ..........................................................................................................15 4.4.2 Transmission efficiency related parameters................................................................................................15 4.4.2.1 Coding rates and constellations.............................................................................................................15 4.4.2.2 OFDM parameter set.............................................................................................................................15 5 Source coding modes..............................................................................................................................17 5.1 Overview ..........................................................................................................................................................17 5.1.1 AAC Audio Coding ....................................................................................................................................18 5.1.2 MPEG CELP coding...................................................................................................................................18 5.1.3 MPEG HVXC coding .................................................................................................................................19 5.1.4 SBR coding.................................................................................................................................................19 5.2 UEP and audio super framing...........................................................................................................................19 5.3 AAC coding......................................................................................................................................................20 5.3.1 AAC............................................................................................................................................................20 5.3.1.1 AAC audio super frame ........................................................................................................................21 5.3.2 AAC + SBR ................................................................................................................................................23 5.4 MPEG CELP coding ........................................................................................................................................24 5.4.1 MPEG CELP ..............................................................................................................................................24 5.4.1.1 CELP audio super frame .......................................................................................................................26 5.5 HVXC ..............................................................................................................................................................28 5.5.1 Definitions ..................................................................................................................................................29 5.5.1.1 HVXC source coder parameters............................................................................................................29 5.5.1.2 CRC bits for fixed bit rate modes..........................................................................................................29 5.5.2 HVXC decoder...........................................................................................................................................29 5.5.3 HVXC encoder ...........................................................................................................................................30 5.5.3.1 LPC analysis and LSP quantization ......................................................................................................31 5.5.3.2 Open loop pitch search..........................................................................................................................31 5.5.3.3 Harmonic magnitude and fine pitch estimation.....................................................................................31 5.5.3.4 Vector quantization of harmonic magnitudes .......................................................................................31 5.5.3.5 Voiced/Unvoiced decision ....................................................................................................................31 5.5.3.6 VXC coding of unvoiced signals ..........................................................................................................31 5.5.4 HVXC channel coding................................................................................................................................32 5.5.4.1 Protected Bit Selection..........................................................................................................................32 5.5.4.2 Syntax of DRM HVXC error resilience (ErHVXCfixframe_CRC)......................................................34 5.5.5 Category Interleaving .................................................................................................................................38 5.5.6 HVXC error detection and concealment.....................................................................................................39 5.5.6.1 Cyclic Redundancy Code (CRC) ..........................................................................................................39 5.5.6.2 Error concealment .................................................................................................................................39 5.5.6.2.1 Parameter replacement ....................................................................................................................40