IEC PAS 62272-1:2002

IEC/PAS 62272-1
Edition 1.0
2002-05
Digital Radio Mondiale (DRM) –
System specification
for digital transmissions
in the broadcasting bands
below 30 MHz
PUBLI C LY AVAI LABLE SPECI F I CATI O N
IN TER N A TION AL
E L E C T R OT E CHNI CA L
Reference number
C O MMI S S I O N
IEC/PAS 62272-1
ETSI TS 101 980 V1.1.1 (2001-09)

Technical Specification
Digital Radio Mondiale (DRM);
System Specification
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
DIGITAL RADIO MONDIALE (DRM) –

System specification for digital transmissions

in the broadcasting bands below 30 MHz

FOREWORD
A PAS is a technical specification not fulfilling the requirements for a standard, but made available to the
public and established in an organization operating under given procedures.
IEC-PAS 62272-1 is identical to ETSI specification TS 101980. The ETSI document is the result of a co-operation
between Digital Radio Mondiale Consortium (DRM) and the European Telecommunications Standards Institute
(ETSI)
Both ETSI and DRM expressed their willingness to have this ETSI document published as an IEC PAS.
IEC-PAS 62272-1 has been processed by IEC technical committee 103: Transmitting equipment for radio-
communication.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document:
Draft PAS Report on voting
103/24/PAS 103/25/RVD
Following publication of this PAS, the technical committee or subcommittee concerned will investigate the
possibility of transforming the PAS into an International Standard.
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all
national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-
operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical
committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work.
International, governmental and non-governmental organizations liaising with the IEC also participate in this
preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance

with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all interested
National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form of
standards, technical specifications, technical reports or guides and they are accepted by the National Committees in
that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards
transparently to the maximum extent possible in their national and regional standards. Any divergence between the
IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this PAS may be the subject of patent rights. The
IEC shall not be held responsible for identifying any or all such patent rights.
Page i
– 2–
Contents
Intellectual Property Rights.6

Foreword .6

Introduction .6

1 Scope.8

2 References.8

3 Definitions, symbols and abbreviations .9
3.1 Definitions . 9
3.2 Symbols . 9
3.3 Abbreviations. 10
4 General characteristics .11
4.1 System overview. 11
4.2 System architecture. 11
4.3 Source coding . 13
4.4 Transmission modes . 14
4.4.1 Signal bandwidth related parameters. 14
4.4.2 Transmission efficiency related parameters . 14
4.4.2.1 Coding rates and constellations . 14
4.4.2.2 OFDM parameter set . 14
5 Source coding modes .16
5.1 Overview. 16
5.1.1 AAC Audio Coding. 17
5.1.2 MPEG CELP coding . 17
5.1.3 MPEG HVXC coding. 18
5.1.4 SBR coding . 18
5.2 UEP and audio super framing. 18
5.3 AAC coding. 19
5.3.1 AAC . 19
5.3.1.1 AAC audio super frame. 20
5.3.2 AAC + SBR. 22
5.4 MPEG CELP coding. 23
5.4.1 MPEG CELP. 23
5.4.1.1 CELP audio super frame. 25
5.5 HVXC. 27
5.5.1 Definitions. 28
5.5.1.1 HVXC source coder parameters . 28
5.5.1.2 CRC bits for fixed bit rate modes . 28

5.5.2 HVXC decoder. 28
5.5.3 HVXC encoder. 29
5.5.3.1 LPC analysis and LSP quantization. 30
5.5.3.2 Open loop pitch search . 30
5.5.3.3 Harmonic magnitude and fine pitch estimation. 30
5.5.3.4 Vector quantization of harmonic magnitudes. 30
5.5.3.5 Voiced/Unvoiced decision. 30
5.5.3.6 VXC coding of unvoiced signals. 30
5.5.4 HVXC channel coding . 31
5.5.4.1 Protected Bit Selection . 31
5.5.4.2 Syntax of DRM HVXC error resilience (ErHVXCfixframe_CRC) . 33
5.5.5 Category Interleaving. 37
5.5.6 HVXC error detection and concealment . 38
5.5.6.1 Cyclic Redundancy Code (CRC). 38
5.5.6.2 Error concealment. 38
5.5.6.2.1 Parameter replacement. 39
5.6 SBR. 41

– 3–
5.6.1 Conceptual overview. 41

5.6.2 AAC + SBR Decoding Process. 42

5.6.2.1 Analysis Filterbank. 42

5.6.2.2 Synthesis Filterbank . 42

5.6.2.3 Gain Control . 43
5.6.2. 4 T/F Grid Control. 43
5.6.2.5 Huffman Decoder . 43

5.6.3 AAC + SBR Protocol. 46

5.6.3.1 AAC + SBR syntax . 46

5.6.3.2 SBR bit stream element definitions . 52

6 Multiplex definition .56
6.1 Introduction. 56
6.2 Main Service Channel. 56

6.2.1 Introduction. 56
6.2.2 Structure . 56
6.2.3 Building the MSC.
...