1、STD-ETSI EN 300 798-ENGL 1798 3400855 0283084 582 EN 300 798 1.1.1 (1998-03) European Standard (Telecommunications series) Digital Audio Broadcasting (DAB); Distribution interfaces; Digital baseband In-phase and Quadrature (DIQ) interface STD=ETSI EN 300 798-ENGL 1998 3400855 02193085 419 EN 300 798
2、 VI .i .i (1998-03) 2 Reference DEN/JTC-DAB-6 (7eOOOico.PDF) Keywords DAB, digital, audio, broadcasting, interface E TSJ Secretariat Postal address F-O6921 Sophia Antipolis Cedex - FRANCE Office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Siret No 348 623 562 00017 - NAF 742
3、C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) No 7803/88 Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Internet secretariat etsi.fr http:/www.etsi .fr http:/w. etsi.org Copyright Notification No part may be reproduced except as authorized by written pennission. The copy
4、right and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 1998. O European Broadcasting Union 1998. Aii rights reserved. 3 EN 300 798 Vl.l.1 (1998-03) Contents Intellectual Property Rights 4 Foreword 4 Introduction 5 1 2 3 3.1 3.2 3.3
5、3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 4 5 5.1 5.2 5.3 6 6.1 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.3 6.3.1 6.3.2 6.3.3 6.3.4 6.4 6.5 6.6 Scope 7 References 7 Definitions. abbreviations and symbols . 7 Definitions . 7 . 8 . 9 . 9 9 . 9 . 9 Constants . . 9 Conceptual location of the DIQ interface 9 General descr
6、iption of the DIQ signal . 9 Mathematical definition . 9 . 10 Numerical range . 10 . 12 12 . 12 Sampling frequency and sample size ace (DIQ) 12 The CLK signal The DATA signal 12 The /I signal . 12 - The FSYNC signal . . 13 . 13 . 13 General . . 13 Logic convention . 14 Line driver characteristi 14 L
7、ine receiver characteristics ( Pin allocation of the DIQ signals . 15 CLK timing jitter 16 Electrical characteristics of the DIQ interface . Timing relationships . 15 Annex A (informative): History 18 Bibliography . 17 STD-ETSI EN 300 798-ENGL 1998 3400855 U283087 291 4 EN 300 798 V1.l.l (1998-03) I
8、ntellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members , and can be found in ETR 314: “Intellectual Property Rights
9、(IPRs); Essential, or potentially Essential, 1PRs notified to ETSI in respect of ETSI standards“, which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/www.etsi.fr/ipr). Pursuant to the ETSI Interim IPR Policy, no investigation, inclu
10、ding IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on http:/www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications
11、 series) has been produced by the Joint Technical Committee (JTC) of the European Broadcasting Union (EBU), Comit Europen de Normalization Electrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC was established in 1990 to Co-ordinate the draf
12、ting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association
13、of broadcasting organizations whose work includes the Co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcas
14、ting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 EUREKA Project 147 (DAB*) EUREKA Project 147 was established in 1987, with funding from the EC, to develop a system for the broadcasting of audio and data to fixed, portable or mobile receivers. Their
15、work resulted in the publication of a European standard, ETS 300 401 (see bibliography), for DAB which now has world-wide acceptance. The members of the EUREKA 147 Project are drawn from broadcasting organizations and telecommunication providers together with companies from the professional and cons
16、umer electronics industry. * DAB is a registered trademark owned by one of the EUREKA 147 partners. National transposition dates Date of adoption of this EN: Date of latest announcement of this EN (doa): 20 February 1998 30 June 1998 Date of latest publication of new National Standard or endorsement
17、 of this EN (dop/e): 31 December 1998 I Date of withdrawal of any conflicting National Standard (dow): 31 December 1998 I STDmETSI EN 300 778-ENGL 1778 3400855 0283088 128 5 EN 300 798 Vl.l.1 (1998-03) Introduction The present document is one of a set associated with DAB. ETS 300 401 (see bibliograp
18、hy) describes the transmitted signal; the interface between the broadcasters transmitters and the listeners receiver. The associated documents, EN 300 797 and ETS 300 799 (see bibliography), describe additional interfaces which can be used by broadcasters or network providers to build DAB networks.
19、Figure 1 shows a DAB network in outline. For convenience, the network is split into a number of different parts, each managed by a different entity. The different entities are; the Programme/Data provider, the Service Component provider, the Ensemble provider and the Transmission Network provider. N
20、OTE: A Service Component provider may be generating a full DAB service or a component of a DAB service. For the purposes of the present document, the terms Service provider and Service Component provider are interchangeable. Programme/Data provider The Programme/Data provider is the originator of th
21、e audio programme or the data being carried within the DAB Service Component. The format for the output of the Programme/Data provider may take many different forms and should be agreed between the Progrdmme/Data provider and the Service Component provider. Service Component provider The Service Com
22、ponent provider is producing one or more complete Service Components which may form the complete DAB service, but may not. Data from the Service Component provider will comprise three different parts: - Service Component data which is to be inserted into the DAB Main Service Channel (MSC); Service I
23、nformation related to the Service Component data which is to be inserted into the Fast Information Channel (FIC); Other data, not intended for transmission, including status monitoring or control. - - The interface between the Service Component provider and the Ensemble provider is known as the Serv
24、ice Transport Interface (STI) and is defined in EN 300 797 (see bibliography). Ensemble provider The Ensemble provider receives a set of service components from one or more Service Component providers. He then formats the FIC, and generates an unambiguous description of the full DAB Ensemble. The en
25、semble description is passed to the Transmission Network provider via an interface called the ET1 which is defined in ETS 300 799 (see bibliography). Transmission Network provider The Transmission Network provider generates the DAB Ensemble and transmits it to the receiver. The output of the Transmi
26、ssion provider is defined by ETS 300 401 (see bibliography). The Transmission Network provider is usually the final recipient of the ET1 and is responsible for turning it into the DAB transmission signal using an OFDM generator. In some cases, as an intermediate step, the Transmission provider may f
27、ind it convenient to generate a baseband representation of the signal to be transmitted. The baseband representation, known as the DIQ, is a set of digital samples defining the In-phase (I) and Quadrature (Q) components of the final carrier. This interface is defined in the present document and prov
28、ides a convenient interface between digital processing equipment and radio-frequency modulating equipment. STD-ETSI EN 300 798-ENGL L998 = 3400855 0283089 ObY = 6 EN 300 798 V1.l .i (1 998-03) A i Figure 1: DAB network outline STD-ETSI EN 300 798-ENGL 1998 E 3400855 0283070 8b E 7 EN 300 798 Vl.l.1
29、(1998-03) 1 Scope The present document establishes a standard method for the connection of digital processing equipment (which is producing DAB baseband IQ signals) and Radio Frequency (RF) modulation equipment in a DAB system. It can also be used to provide access to baseband VQ signals for test pu
30、rposes. ETS 300 401 established a broadcasting standard for a DAB system. Broadcasters who implement DAB networks require standardized interfaces for the connection of different equipment in the DAB chain. The present document is applicable to DAB channel coding equipment. It describes the character
31、istics of a suitable interface for the connection of the two major elements of the DAB OFDM generator; the baseband processing equipment and the RF modulator. The interface provides an interconnection between a single source (the baseband processor) and a single destination (the RF modulator). The p
32、resent document does not cover the generation of the digital IQ baseband signals. This is covered in ETS 300 401. The digital baseband I/Q interface is unidirectional and does not cover the provision of status nor control information in the reverse direction (i.e. from the modulator back to the base
33、band processing section of the equipment). 2 Ref ere nces References may be made to: specific versions of publications (identified by date of publication, edition number, version number, etc.), in which case, subsequent revisions to the referenced document do not apply; or all versions up to and inc
34、luding the identified version (identified by “up to and including“ before the version identity); or all versions subsequent to and including the identified version (identified by “onwards“ following the version identity); or publications without mention of a specific version, in which case the lates
35、t version applies. A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. DI ITU-R BT.656-2 (November 1994): “Interfaces for digital component video signals in 525-line and 625-line television systems“. 3 3.1 Definitions, abbreviati
36、ons and symbols Definit ions For the purposes of the present document, the definitions of ETS 300 401 (see bibliography) and the following definitions apply: baseband VQ: A representation of the DAB transmission signal using I and Q components of the carrier which represent the amplitude of the in-p
37、hase and quadrature components of the transmission signal. baseband processing: When applied to the DIQ interface, this is taken to mean that part of the OFDM generator which receives the ETI signal and produces the DIQ signal. CIFcount: The Common Interleaved Frame (CIF) counter as defined in ETS 3
38、00 401 (see bibliography). STD.ETSI EN 300 798-ENGL 1998 W 3400855 0283091 712 8 EN 300 798 Vl.1.l (1998-03) COFDM: Coded Orthogonal Frequency Division Multiplex; the combination of channel coding and OFDM as used in the DAB system. data transfer time: The instant at which data is read by the DIQ re
39、ceiver. digital baseband YQ: A version of the baseband VQ signal using digital samples to represent the amplitudes of I and Q. DAB transmission signal: The radio frequency signal radiated from a DAB transmitter. DAB transmission frame: The transmitted frame, specific to the four transmission modes u
40、sed by the DAB system, conveying the DAB data. ensemble: The DAB transmission signal, comprising a set of regularly and closely-spaced orthogonal carriers. The ensemble is the entity which is received and processed by the DAB receiver. in general, it contains programme and data services. Also someti
41、mes used loosely to describe the package of data (or Ensemble Multiplex) representing that signal. null symbol: The first Orthogonal Frequency Division Multiplex (OFDM) symbol of the DAB transmission frame. OFDM: Orthogonal Frequency Division Multiplex, the modulation method employed by the DAB syst
42、em. OFDM generator: The equipment which is the final recipient of the ET1 signal and which generates the OFDM signal from it. The OFDM generator is taken to have two major parts - baseband processing, which generates a baseband VQ signal as an intermediate step, followed by RF modulation. RF modulat
43、or: When applied to the DIQ interface, this is taken to mean that part of the OFDM generator which receives the DIQ signal and produces a DAB transmission signal. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: CLK COFDM DAB DIQ ECL ET1 FFT FIC FSYNC GN
44、D I(t JJQ I” LSb MSb NRZ OFDM Q(t, RF s(t) n STI TI1 rmS Clock Coded Orthogonal Frequency Division Multiplex Digital Audio Broadcasting Digital baseband VQ interface Emitter-Coupled Logic Ensemble Transport Interface Fast Fourier Transform Fast Information Channel Frame Synchronization Ground the ti
45、me variant, In-phase component of the modulated signal In-phase and Quadrature components of the modulated signal the nth sample of I(t) the time variant, In-phase component of the modulated signal during the Ti1 symbol International Telecommunications Union Least Significant bit Most Significant bi
46、t Non-Re turn-to-Zero Orthogonal Frequency Division Multiplex the time variant, Quadrature component of the modulated signal the nth sample of Q(t) the time variant, Quadrature component of the modulated signal during the Tii symbol an alternating signal which identifies a DIQ sample as either an I,
47、 or Q, sample Radio Frequency root-mean-square the time variant DAB transmission signal the sampled version of the DAB transmission signal Service Transport Interface Transmitter Identification Information - STD-ETSI EN 300 798-ENGL L778 3400855 0283092 b.59 9 EN 300 798 Vl.l.1 (1998-03) 3.3 Symbols
48、 For the purposes of the present document, the following mathematical symbols apply: 3.3.7 b.nI 3.3.2 bn 3.3.3 + X 3.3.4 cos x sin x j 0 3.3.5 n Numerical ranges denotes the numerical range m, m + 1, m + 2, ., n, where m and n are positive integers with n m. Bit numbering denotes bit number n. n is
49、usually in the range 07. Arithmetic operators Addition Multiplication Functions Cosine of x Sine of x Imaginary unit with j rms value = -1 Constants 3,141 592 653 59 . 4 Conceptual location of the DIQ interface Figure 2 is a modified version of a diagram taken from ETS 300 401 (see bibliography) and shows the conceptual block diagram of the emission part of the DAB system. The conceptual location of the DIQ is shown on the diagram . The DIQ interface may also be used directly at the output of the baseband processing part of the OFDM generator, as shown in figu
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