SIST EN 300 798:2000

SLOVENSKI STANDARD
SIST EN 300 798:2000
01-januar-2000
Digitalna zvokovna radiodifuzija (DAB) - Vmesniki za razpošiljanje - Vmesnik DIQ
Digital Audio Broadcasting (DAB); Distribution interfaces; Digital baseband In-phase and
Quadrature (DIQ) interface
Ta slovenski standard je istoveten z: EN 300 798 Version 1.1.1
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
SIST EN 300 798:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 798:2000

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SIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)
European Standard (Telecommunications series)
Digital Audio Broadcasting (DAB);
Distribution interfaces;
Digital baseband In-phase and Quadrature (DIQ) interface
European Broadcasting Union Union Européenne de Radio-Télévision
EBU
UER
European Telecommunications Standards Institute

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SIST EN 300 798:2000
2 EN 300 798 V1.1.1 (1998-03)
Reference
DEN/JTC-DAB-6 (7e000ico.PDF)
Keywords
DAB, digital, audio, broadcasting, interface
ETSI Secretariat
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Internet
secretariat@etsi.fr
http://www.etsi.fr
http://www.etsi.org
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1998.
© European Broadcasting Union 1998.
All rights reserved.

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SIST EN 300 798:2000
3 EN 300 798 V1.1.1 (1998-03)
Contents
Intellectual Property Rights.4
Foreword .4
Introduction .5
1 Scope.7
2 References.7
3 Definitions, abbreviations and symbols.7
3.1 Definitions . 7
3.2 Abbreviations. 8
3.3 Symbols . 9
3.3.1 Numerical ranges. 9
3.3.2 Bit numbering. 9
3.3.3 Arithmetic operators. 9
3.3.4 Functions. 9
3.3.5 Constants. 9
4 Conceptual location of the DIQ interface .9
5 General description of the DIQ signal .9
5.1 Mathematical definition . 9
5.2 Sampling frequency and sample size . 10
5.3 Numerical range. 10
6 Details of the Digital baseband I/Q interface (DIQ).12
6.1 General. 12
6.2 Definition of DIQ signals. 12
6.2.1 The CLK signal . 12
6.2.2 The DATA signal. 12
Q/I
6.2.3 The signal. 12
6.2.4 The FSYNC signal . 13
6.2.5 Signal direction . 13
6.3 Electrical characteristics of the DIQ interface . 13
6.3.1 General. 13
6.3.2 Logic convention. 14
6.3.3 Line driver characteristics (source) . 14
6.3.4 Line receiver characteristics (destination). 14
6.4 Pin allocation of the DIQ signals . 15
6.5 Timing relationships . 15
6.6 CLK timing jitter. 16
Annex A (informative): Bibliography.17
History.18

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SIST EN 300 798:2000
4 EN 300 798 V1.1.1 (1998-03)
Intellectual 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 (IPRs); Essential, or potentially Essential, IPRs 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, including 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 series) has been produced by the Joint Technical Committee (JTC) of the
European Broadcasting Union (EBU), Comité Européen de Normalization Electrotechnique (CENELEC) and the
European Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting 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 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 Broadcasting 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 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 consumer electronics industry.
* DAB is a registered trademark owned by one of the EUREKA 147 partners.
National transposition dates
Date of adoption of this EN: 20 February 1998
Date of latest announcement of this EN (doa): 30 June 1998
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 December 1998
Date of withdrawal of any conflicting National Standard (dow): 31 December 1998

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SIST EN 300 798:2000
5 EN 300 798 V1.1.1 (1998-03)
Introduction
The present document is one of a set associated with DAB. ETS 300 401 (see bibliography) describes the transmitted
signal; the interface between the broadcaster's transmitters and the listener's 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.
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.
NOTE: 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 the 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 Programme/Data provider and the Service Component provider.
Service Component provider
The Service Component 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 Information 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 Service 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 ensemble description is passed to the Transmission Network provider via an interface called the ETI 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
Transmission provider is defined by ETS 300 401 (see bibliography). The Transmission Network provider is usually the
final recipient of the ETI 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 find 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 provides a convenient interface between digital processing equipment and radio-frequency modulating
equipment.

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6 EN 300 798 V1.1.1 (1998-03)
Figure 1: DAB network outline
SIST EN 300 798:2000
Service Component provider A
Programme
or Data
provider A(1)
STI - Service Transport Interface
ETI - Ensemble Transport Interface
DIQ - Digital baseband I/Q interface
Service
Component
provider
Transmission Network Provider
Programme
or Data
STI DIQ
Baseband RF
provider A(n)
processing modulation
DAB Ensemble to
ETS 300 401 [1]
ETI
Transmitter 1
STI
Ensemble
From other Service
ETI
Component providers provider
STI
ETI
Transmitter M
Service Component provider Z
Programme
DIQ
STI
Baseband RF
or Data
processing modulation
DAB Ensemble to
provider Z(1)
ETS 300 401 [1]
Service
Component
provider
Programme
or Data
provider Z(p)

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SIST EN 300 798:2000
7 EN 300 798 V1.1.1 (1998-03)
1 Scope
The present document establishes a standard method for the connection of digital processing equipment (which is
producing DAB baseband I/Q signals) and Radio Frequency (RF) modulation equipment in a DAB system. It can also
be used to provide access to baseband I/Q signals for test purposes.
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 characteristics 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 present document does not cover the generation of the digital I/Q 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 baseband processing section of the equipment).
2 References
References may be made to:
a) 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
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) publications without mention of a specific version, in which case the latest 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.
[1] ITU-R BT.656-2 (November 1994): "Interfaces for digital component video signals in 525-line
and 625-line television systems".
3 Definitions, abbreviations and symbols
3.1 Definitions
For the purposes of the present document, the definitions of ETS 300 401 (see bibliography) and the following
definitions apply:
baseband I/Q: A representation of the DAB transmission signal using I and Q components of the carrier which
represent the amplitude of the in-phase 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)
...