EN 50248:2001
(Main)Characteristics of DAB receivers
Characteristics of DAB receivers
This standard describes the DAB (Digital Audio Broadcasting) receiver characteristics for consumer equipment intended for terrestrial and cable reception operating in band III and L- band and for satellite reception in L-band. Dedicated receivers for specific applications are not within the scope of this standard.
Eigenschaften von DAB-Empfängern
Caractéristiques du récepteur DAB
Characteristics of DAB receivers
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2003
1DGRPHãþD
SIST EN 50248:1999
Characteristics of DAB receivers
Characteristics of DAB receivers
Eigenschaften von DAB-Empfängern
Caractéristiques du récepteur DAB
Ta slovenski standard je istoveten z: EN 50248:2001
ICS:
33.160.20 Radijski sprejemniki Radio receivers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50248
NORME EUROPÉENNE
EUROPÄISCHE NORM August 2001
ICS 33.160.20 Supersedes EN 50248:1997
English version
Characteristics of DAB receivers
Caractéristiques du récepteur DAB Eigenschaften von DAB-Empfängern
This European Standard was approved by CENELEC on 2000-08-01. 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 three official versions (English, French, 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and 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
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50248:2001 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 206, Consumer
equipment for entertainment and information and related sub-systems.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50248 on 2000-08-01.
This European Standard supersedes EN 50248:1997.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-08-01
Annexes designated "normative" are part of the body of the standard. Annexes designated "informative"
are given for information only. In this standard annexes A and C are informative and annex B is
normative.
__________
- 3 - EN 50248:2001
Contents
1 Scope.4
2 Normative references .4
3 Terms and definitions .5
4 Basic implementation and functional performance requirements .5
4.1 Audio decoder .5
4.2 Automatic mode selection.7
4.3 Frequency bands .7
4.4 Service selection .7
4.5 Receiver reactions to a multiplex re-configuration.8
4.6 Automatic switching to another ensemble .8
4.7 Response to conditional access (CA) services .8
4.8 Output for audio and other services.8
4.9 Transparency for copy protection .9
4.10 Coding profiles (Minimum implementation of specified coding profiles).9
5 Interfaces .9
5.1 General.9
5.2 RF input .9
5.3 Analogue audio interface [EN 61938] .9
5.4 Digital audio interface [IEC 60958-3].9
5.5 Coded audio interface [IEC 61937].9
5.6 General digital interface (F in Figure 1) .10
5.7 Conditional access interface .10
6 Options.10
6.1 General.10
6.2 Receiver display .10
6.3 Other features .10
7 Minimum performance levels and measuring methods .11
7.1 General conditions.11
7.2 Audio part - Performance requirements .11
7.3 R.F. part .12
Annex A (informative) Recommended centre frequencies for DAB .18
Annex B (normative) Characteristics of a Rayleigh channel.21
Annex C (informative) Bibliography .26
1 Scope
This standard describes the DAB (Digital Audio Broadcasting) receiver characteristics for consumer
equipment intended for terrestrial and cable reception operating in band III and
L- band and for satellite reception in L-band. Dedicated receivers for specific applications are not within
the scope of this standard.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references the latest edition of the publication referred to applies (including amendments).
EN 50255, Digital Audio Broadcasting system – Specification of the receiver data interface (RDI)
1)
EN 55013 , Limits and methods of measurement of radio disturbance characteristics of broadcast
receivers and associated equipment (CISPR 13, mod)
1)
EN 55020 , Electromagnetic immunity of broadcast receivers and associated equipment - Limits and
methods of measurement of immunity characteristics of sound and television broadcast receivers and
associated equipment
EN 60169-24, Radio-frequency connectors - Part 24: Radio-frequency coaxial connectors with screw
coupling, typically for use in 75 ohm cable distribution systems (Type F)
EN 60315-4, Methods of measurement on radio receivers for various classes of emission - Part 4:
Receivers for frequency-modulated sound broadcasting emissions
EN 61606, Audio and audiovisual equipment – Digital audio parts - Basic methods of measurement of
audio characteristics (IEC 61606)
EN 61938, Audio, Video and audiovisual systems – Interconnection and matching values. Preferred
matching values of analogue signals (IEC 61938)
EN 300 401, Digital Audio Broadcasting to mobile, portable and fixed receivers. (DAB system standard).
IEC 60169-10, Radio-frequency connectors - Part 10: R.F. coaxial connectors with inner diameter of
outer conductor 3 mm (0,12 in) with snap-on coupling - Characteristic impedance 50 ohms (Type SMB)
IEC 60315-1, Methods of measurement on radio receivers for various classes of emission - Part 1:
General considerations and methods of measurement, including audio-frequency measurement
(harmonized as HD 560.1)
IEC 60958-3, Digital audio interface - Part 3 : Consumer applications
IEC 61937, Interface for non-linear PCM encoded audio bitstreams applying to IEC 60958
ISO/IEC 11172-3, Coding of moving pictures and associated audio for digital storage media at up to
1,5 Mbit/s - Part 3: Audio
1)
An amendment concerning digital receivers is in preparation.
- 5 - EN 50248:2001
ISO/IEC 11172-4, Coding of moving pictures and associated audio for digital storage media at up to
1,5 Mbit/s - Part 4: Compliance testing
ISO/IEC 13818-3, Generic coding of moving pictures and associated audio information - Part 3: Audio
ISO/IEC 13818-4, Generic coding of moving pictures and associated audio information - Part 4:
Compliance testing
ETSI TR 101 496-2, Digital Audio Broadcasting system (DAB) - Guidelines and rules of implementation
and operation. Volume 2: System feature.
ETSI TS 101 757, Digital Audio Broadcasting system (DAB) - Conformance Testing for DAB Audio
3 Terms and definitions
For the purpose of this European Standard, the following definitions apply.
Other definitions, abbreviations and symbols are solely related to DAB unless stated otherwise.
3.1
DAB receiver
receiver which is intended to receive and decode programmes transmitted according to the DAB system
specification EN 300 401
NOTE Figure 1 shows an example of a functional block diagram of a DAB Receiver according to EN 300 401(for information only).
3.2
minimum requirement
is the lowest value that a DAB receiver should fulfil in order to be called a DAB receiver. It takes into
account low cost receivers
4 Basic implementation and functional performance requirements
4.1 Audio decoder
The audio decoder function of a DAB receiver shall conform to the subset of ISO/IEC 11172-3 as defined
in EN 300 401. The conformity is described in ETSI TS 101 757. The audio decoder should include an
error concealment method which may be based on the ScF-CRC (Scale Factor-Cyclic Redundancy
Check) as defined within EN 300 401. If for any reason the data stream cannot be decoded, the receiver
shall mute.
The audio part shall be able to decode DAB bit streams corresponding to both 24 and 48 kHz sampling
frequencies.
It shall comply with ISO/IEC 11172-3 and ISO/IEC 13818-3 (bit-rates above 256 kHz/s are optional).
D
C
PAD
L-Band t errestrial
I
A L-Band satellite
L
23 4
Band III
RF Input
R
FFT, Demux &
J
Audio Decoder
IF- A/D
RF Front End Audio Processing
Channel Decoder
Speakers
System Bus
Analog/Digital
H
System Control
FIC &TII Decoding
Conditional 8 9
Access
Other Signal Sources
Man Machine Packet Mode
Synchronization
Interface (MMI) Decoder
Timing (FM, Cassette,CD, DCC)
G
Card
Display Digital Record / Play
Reader
Coded Audio
F DATA out E
Block 8 and 10 are optional, block 9 is not part of the DAB receiver
Figure 1 - Example of a functional block diagram of a DAB receiver
- 7 - EN 50248:2001
4.2 Automatic mode selection
4.2.1 Introduction
Four different transmission modes are defined: modes I, II, III & IV. Radio frequency characteristics are
described in EN 300 401(see clause 15, Radio frequency characteristics).
The modes can be detected by checking the following relevant parameters of the DAB signal: the frame
duration, null symbol duration and carrier spacing.
4.2.2 Requirements
The receiver shall detect the mode of the DAB signal and switch to the appropriate reception mode.
4.3 Frequency bands
The receiver shall provide reception of at least one DAB ensemble, in the following RF Bands:
Band III: 174 MHz to 240 MHz
L-Band: 1 452 MHz to 1 492 MHz (see note 1)
Other bands: see note 2
The centre frequencies are given in annex A. The receiver should be able to correct transmitter
frequency offsets by up to ± 1/2 of the carrier spacing.
NOTE 1 L-Band as defined by ITU WARC-92. L-Band is allocated for both terrestrial and satellite digital sound broadcasting. See
also "Radio Regulations, Article 8 (Frequency Allocations) International Telecommunication Union. Update in 1995 Geneva Switzerland".
NOTE 2 For specific demands (e.g. cable distribution etc.) other frequencies can optionally be used.
4.4 Service selection
4.4.1 Introduction
The MSC (Main Service Channel) and the FIC (Fast Information Channel) carry the components and
Multiplex Configuration Information (MCI) respectively of the services which make up a DAB Ensemble
mulltiplex.
Each service has one or more service components. Several services may be carried in one Ensemble
multiplex.
A user of a DAB receiver accesses service components by selecting a service.
A distinction is made between the essential service component of a service, which is called the "Primary"
component and other components which are considered "Secondary".
The MCI is carried in the FIC to avoid the inherent transmission delay associated with the time-
interleaving process applied to the MSC.
4.4.2 Requirements
To gain access to the desired programme service, the receiver must decode the MCI, make the
information available to the MMI (Man Machine Interface) for selection, and then output the selected
service.
4.5 Receiver reactions to a multiplex re-configuration
Informa
...
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