IEC 62104:2015

IEC 62104 ®
Edition 3.0 2015-07
INTERNATIONAL
STANDARD
Characteristics of DAB receivers
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IEC 62104 ®
Edition 3.0 2015-07
INTERNATIONAL
STANDARD
Characteristics of DAB receivers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.060.20 ISBN 978-2-8322-2812-8

– 2 – IEC 62104:2015 © IEC 2015
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references. 8
3 Terms and definitions . 10
4 Basic implementation and functional performance requirements . 13
4.1 Automatic mode selection . 13
4.1.1 General . 13
4.1.2 Requirements . 13
4.2 Frequency bands . 13
4.3 Channel decoder . 13
4.3.1 Standard receiver . 13
4.3.2 Multimedia receiver . 13
4.4 Service selection . 13
4.4.1 General . 13
4.4.2 Requirements . 14
4.5 Receiver reactions to a multiplex reconfiguration . 14
4.6 Audio decoder . 14
4.6.1 General . 14
4.6.2 DAB services . 15
4.6.3 DAB+ services . 15
4.7 Automatic switching to another ensemble . 15
4.8 Response to conditional access (CA) services . 15
4.8.1 General . 15
4.8.2 Requirements for DAB receivers without CA capabilities . 15
4.9 Output for audio and other services . 15
4.9.1 General . 15
4.9.2 Requirements . 16
4.10 Display . 16
4.10.1 Standard receiver . 16
4.10.2 Multimedia receiver . 16
4.11 Text labels . 16
4.11.1 Standard receiver . 16
4.11.2 Multimedia receiver . 16
4.12 Data applications . 17
4.12.1 Standard receiver . 17
4.12.2 Multimedia receiver . 17
5 Interfaces . 17
5.1 General . 17
5.2 RF input . 17
5.2.1 General . 17
5.2.2 Domestic and portable receivers . 17
5.2.3 Automotive receivers . 18
5.3 Analogue audio interface (see IEC 61938) . 19
5.4 Digital audio interface (see IEC 60958-3) . 19
6 Options . 19
6.1 General . 19

6.2 Service lists . 19
6.3 Display . 20
6.3.1 General . 20
6.3.2 Service labels and service component labels . 20
6.3.3 Dynamic label . 20
6.3.4 Signal quality indicator . 20
6.3.5 Audio coding information . 20
6.4 Other receiver features . 21
6.4.1 Time and date . 21
6.4.2 Service following . 21
6.4.3 Announcements . 21
6.4.4 Dynamic range control (DRC) . 21
6.5 Data features . 21
6.5.1 Journaline . 21
6.5.2 Broadcast website (BWS) . 22
6.5.3 TPEG services . 22
7 Minimum performance levels and measuring methods . 22
7.1 General conditions . 22
7.1.1 General – Published specifications for receivers . 22
7.1.2 Power supply . 22
7.1.3 Atmospheric conditions . 22
7.1.4 BER measurement conditions . 22
7.1.5 Acoustic onset of impairment (OOI) measurement conditions . 23
7.1.6 DAB signal . 23
7.1.7 Receiver classification . 23
7.2 Audio part – Performance requirements . 24
7.2.1 General . 24
7.2.2 DAB services . 24
7.2.3 DAB+ services . 24
7.3 RF part – Sensitivity test methods . 24
7.3.1 General . 24
7.3.2 Baseband stream and RF conditions for BER and OOI testing . 24
7.3.3 Baseband stream and listening conditions for acoustic OOI testing . 24
7.4 Sensitivity requirement using a conducted signal at node “A” . 25
7.4.1 General . 25
7.4.2 Method of measurement (Gaussian channel) using BER . 25
7.4.3 Presentation of results using BER . 25
7.4.4 Requirements – Receiver types A2, C2, D, E2 using BER . 26
7.4.5 Method of measurement (Gaussian channel) using acoustic OOI . 26
7.4.6 Presentation of results using acoustic OOI . 26
7.4.7 Requirements – Receiver types A2, C2, D, E2 using acoustic OOI . 26
7.5 Sensitivity using radiated electromagnetic wave at node "N" . 27
7.5.1 General . 27
7.5.2 Link budget transmission assumption – Non-automotive receivers . 27
7.5.3 Method of measurement – Non-automotive types A1, B, C1. C2 and A2
with optional antenna . 27
7.5.4 Presentation of results . 29
7.5.5 Requirements – Types A1, B, C1, C2 and A2 with optional antenna . 29
7.5.6 Link budget transmission assumption – Automotive types D, E1, E2 . 29

– 4 – IEC 62104:2015 © IEC 2015
7.6 RF part – Maximum input power . 29
7.6.1 General . 29
7.6.2 Method of measurement (Gaussian channel) . 29
7.6.3 Presentation of results . 29
7.6.4 Requirements . 29
7.7 RF part – Selectivity . 30
7.7.1 General . 30
7.7.2 Adjacent channel selectivity . 30
7.7.3 Rejection of unwanted signals (far-off selectivity) . 32
7.8 RF part – Performance in a Rayleigh channel . 33
7.8.1 General . 33
7.8.2 Sensitivity . 33
7.8.3 Method of measurement – Conducted input signal only . 33
7.8.4 Presentation of results . 35
7.8.5 Requirements . 35
7.9 RF part – Acquisition time after synchronization loss . 35
7.9.1 General . 35
7.9.2 Method of measurement . 35
7.9.3 Presentation of results . 36
7.9.4 Requirements . 36
Annex A (informative) Recommended centre frequencies . 37
Annex B (normative) Characteristics of a Rayleigh channel . 39
B.1 Simulation of the mobile radio channel . 39
B.2 Doppler spectrum types . 39
B.2.1 General . 39
B.2.2 Doppler spectrum: CLASS . 40
B.2.3 Doppler spectrum: GAUS1 . 40
B.2.4 Doppler spectrum: GAUS2 . 40
B.2.5 Doppler spectrum: GAUSDAB . 40
B.2.6 Doppler spectrum: RICE . 40
B.3 Propagation models . 40
B.3.1 General . 40
B.3.2 Typical rural (non-hilly) area (RA) . 41
B.3.3 Typical urban (non-hilly) area (TU) . 41
B.4 Tap setting for hardware simulators . 42
Annex C (informative) Basic characteristics and functionality for accessibility for blind
and visually impaired users . 44
Bibliography . 45

Figure 1 – Example of a functional block diagram of a DAB receiver . 12
Figure 2 – Block diagram for the measurement of the sensitivity and the maximum
input power, using BER . 25
Figure 3 – Block diagram for the measurement of the sensitivity and the maximum
input power, using acoustic OOI . 26
Figure 4 – Block diagram for the measurement of free field sensitivity . 27
Figure 5 – Free field screened chamber measurement – Features and setup . 28
Figure 6 – Spectrum mask of the DAB signal for selectivity measurements . 30
Figure 7 – Block diagram for BER method selectivity measurements . 31

Figure 8 – Block diagram for OOI method selectivity measurements. 32
Figure 9 – Block diagram for measuring the performance in a Rayleigh channel . 34
Figure 10 – Block diagram for measuring acquisition time after synchronization loss . 35
Figure B.1 – Continuous delay power profile P(τ) for RA . 41
Figure B.2 – Continuous delay power profile P(τ) for TU . 41

Table 1 – Performance requirement for an automotive active antenna . 18
Table 2 – Classification of receiver types . 23
Table 3 – Conditions for BER and OOI testing . 24
Table 4 – Conditions for acoustic OOI testing . 25
Table 5 – Conditions for uniform signal level . 28
Table 6 – Minimum requirements for maximum input power (conducted) . 30
Table 7 – Difference between the centre frequencies of the DAB ensembles . 31
Table 8 – Minimum requirement for adjacent channel selectivity . 32
Table 9 – Channel simulation profiles related to frequency band and mode . 34
Table A.1 – Recommended centre frequencies for DAB (1 of 2) . 37
Table B.1 – Four tap setting for typical rural (non-hilly) area (RA) . 42
Table B.2 – Six tap setting for typical rural (non-hilly) area (RA) . 42
Table B.3 – Twelve tap setting for typical urban (non-hilly) area (TU) . 43
Table B.4 – Six tap setting for typical urban (non-hilly) area (TU) . 43
Table B.5 – Tap setting for single-frequency networks (SFN) in VHF bands. 43

– 6 – IEC 62104:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CHARACTERISTICS OF DAB RECEIVERS

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
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Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62104 has been prepared by technical area 1, Terminals for
audio,video and data services and contents, of IEC technical committee 100: Audio, video and
multimedia systems and equipment.
This third edition cancels and replaces the second edition published in 2003. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are as follows.
• The document has been updated in line with the development of the DAB system, and in
particular the introduction of DAB+ audio services (see ETSI TS 102 563).
• Requirements for displays, text and data applications have been introduced to reflect
market trends.
___________
For an overview of the DAB standards, see ETSI TR 101 495.

• Additional test methods have been introduced to allow R.F. measurements to be made on
receivers with integrated antennas and/or no external BER indicators by using an acoustic
impairment method.
• Clause 6 has been updated to reflect the development of the market and to provide better
guidance for the implementation of optional features.
The text of this standard is based on the following documents:
FDIS Report on voting
100/2502/FDIS 100/2541/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 8 – IEC 62104:2015 © IEC 2015
CHARACTERISTICS OF DAB RECEIVERS

1 Scope
This International Standard describes the digital audio broadcasting (DAB) receiver
characteristics for consumer equipment intended for terrestrial and cable reception operating
in VHF band III. Dedicated receivers for specific applications are not within the scope of this
standard. This standard describes the characteristics for different classes and categories of
DAB receivers such as standard and multimedia receivers and domestic, automotive and
adapter receivers.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
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
measurements
IEC 60315-4, Methods of measurement on radio receivers for various classes of emission –
Part 4: Receivers for frequency-modulated sound-broadcasting emissions
IEC 60958-3, Digital audio interface – Part 3: Consumer applications
IEC 61169-2:2007, Radio-frequency connectors – Part 2: Sectional specification – Radio
frequency coaxial connectors of type 9,52
IEC 61169-24, Radio-frequency connectors – Part 24: Sectional specification – Radio
frequency coaxial connectors with screw coupling, typically for use in 75 ohm cable networks
(type F)
IEC 61606 (all parts), Audio and audiovisual equipment – Digital audio parts – Basic
measurement methods of audio characteristics
IEC 61938, Multimedia systems – Guide to the recommended characteristics of analogue
interfaces to achieve interoperability
IEC 62106:2009, Specification of the radio data system (RDS) for VHF/FM sound
broadcasting in the frequency range from 87,5 MHz to 108,0 MHz
ISO/IEC 10646, Information technology – Universal Coded Character Set (UCS)
ISO/IEC 11172-3, Information technology – Coding of moving pictures and associated audio
for digital storage media at up to about 1,5 Mbit/s – Part 3: Audio

ISO/IEC 13818-3, Information technology – Generic coding of moving pictures and
associated audio information – Part 3: Audio
ISO/IEC 14496-3 Information technology – Coding of audio-visual objects – Part 3: Audio
ISO/IEC 23003-1:2007, Information technology – MPEG audio technologies – Part 1: MPEG
Surround
ISO 20860-1, Road vehicles − 50 ohms impedance radio frequency connection system
interface − Part 1: Dimensions and electrical requirements
ETSI EN 300 401:2006, Radio Broadcasting Systems; Digital Audio Broadcasting (DAB) to
mobile, portable and fixed receivers
ETSI EN 301 234, Digital Audio Broadcasting (DAB); Multimedia Object Transfer (MOT)
protocol
ETSI TS 101 498, Digital Audio Broadcasting (DAB); Broadcast Website
ETSI TS 101 499, Digital Audio Broadcasting (DAB); SlideShow; User Application
Specification
ETSI TS 101 756, Digital Audio Broadcasting (DAB); Registered Tables
ETSI TS 101 757, Digital Audio Broadcasting System (DAB); Conformance Testing for DAB
Audio
ETSI TS 102 371, Digital Audio Broadcasting (DAB); Digital Radio Mondiale (DRM);
Transportation and Binary Encoding Specification for Service and Programme Information
(SPI)
ETSI TS 102 428, Digital Audio Broadcasting (DAB); DMB video service; User Application
Specification
ETSI TS 102 563, Digital Audio Broadcasting (DAB); Transport of Advanced Audio Coding
(AAC) audio
ETSI TS 102 652, Digital Audio Broadcasting (DAB); Intellitext; Application specification
ETSI TS 102 818, Hybrid Digital Radio (DAB, DRM, RadioDNS); XML Specification for
Service and Programme Information (SPI)
ETSI TS 102 979, Digital Audio Broadcasting (DAB); Journaline; User application
specification
ETSI TS 102 980, Digital Audio Broadcasting (DAB); Dynamic Label Plus (DL Plus);
Application specification
ETSI TS 103 176, Digital Audio Broadcasting (DAB); Rules of implementation; Service
information features
COST 207, Digital Land Mobile Radio Communications – COST 207, Commission of the
European Communities, Final Report, 14 March 1984 − 13 September 1988, Office for Official
Publications of the European Communities, Luxembourg,1989

– 10 – IEC 62104:2015 © IEC 2015
3 Terms and definitions
For the purposes of this document, the following definitions apply. Other definitions,
abbreviations and symbols are solely related to DAB unless stated otherwise.
3.1
bit error rate
BER
ratio of the number of bits received inverted to the total number of bits sent
3.2
DAB receiver
receiver intended to receive and decode signals transmitted according to the DAB system
specification ETSI EN 300 401
Note 1 to entry: Figure 1 shows an example of a functional block diagram of a DAB receiver according to
ETSI EN 300 401 (for information only).
3.3
standard radio receiver
DAB receiver intended to present audio programmes with at least an alphanumeric display
3.4
multimedia receiver
DAB receiver intended to present audio programmes and data applications with a colour
display of at least (320 × 240) pixels
3.5
minimum requirement
lowest value that a DAB receiver should fulfil in order to be called a DAB receiver
Note 1 to entry: It takes into account low-cost receivers.
3.6
DAB service
service in which the primary service component is encoded in a stream audio sub-channel
according to ETSI EN 300 401:2006, Clause 7
3.7
DAB+ service
service in which the primary service component is encoded in a stream audio sub-channel
according to ETSI TS 102 563
3.8
DMB service
service in which the primary service component is encoded in a stream data sub-channel
according to ETSI TS 102 428
3.9
data service
service in which the primary service component is encoded in a stream data or packet data
sub-channel
3.10
capacity unit
CU
smallest addressable portion of a DAB multiplex

3.11
dynamic label
DL
text message from the broadcaster for display on receivers
3.12
fast information group
FIG
signalling information from the broadcaster which is used by the receiver
3.13
MPEG surround
system providing mono and stereo compatible coding of surround audio
3.14
onset of impairment
OOI
point at which audio impairments reach a threshold of three per 10 s listening period

– 12 – IEC 62104:2015 © IEC 2015

Antenna with
electromagnetic
wave coupling
N
B C
E
PAD
Data out
Headphones
L
Audio
B III
decoder DAB
FFT, demux,
A
K
Audio
MPEG2 or
IF- A/D
RF Front End channel
processing
DAB+ HE-
decoder
L
AAC
Conducted
Band J
signal input
1 2 3 4
(optional)
node where
exposed
H
System bus
Line
System control, FCI, TII
Other audio
decoding, man machine
signal sources
I2S
interface
Packet mode
decoder
USB
M
Synchronisation Coded
(optional)
timing audio
and
Display User controls
other audio
F
I2S, SPDIF
outputs
Data out
Line
D
IEC
Key The numbers in the corners refer to blocks.
NOTE Block 8 is optional, block 9 is not part of the DAB receiver.
Figure 1 – Example of a functional block diagram of a DAB receiver

4 Basic implementation and functional performance requirements
4.1 Automatic mode selection
4.1.1 General
Four different transmission modes are defined: modes I, II, III and IV. Radiofrequency
characteristics are described in Clause 15 of ETSI EN 300 401:2006.
The modes can be detected by checking the following relevant parameters of the DAB signal:
the frame duration, null-symbol duration and carrier spacing.
4.1.2 Requirements
The receiver shall detect the mode of the DAB signal and switch to the appropriate reception
mode.
4.2 Frequency bands
The receiver shall provide reception of at least one DAB ensemble, in the following r.f. band:
Band III: 174 MHz to 240 MHz
Cable and other specific requirement receivers may also provide reception in other r.f. bands.
The centre frequencies are given in Annex A. The receiver should be able to correctly deal
with transmitter frequency offsets by up to ±1/2 of the carrier spacing.
4.3 Channel decoder
4.3.1 Standard receiver
The channel decoder shall decode at least one sub-channel and shall be capable of decoding:
– when containing a DAB service, at least 280 capacity units;
– when containing a DAB+ service , at least 144 capacity units.
4.3.2 Multimedia receiver
The channel decoder shall be capable of decoding at least four sub-channels simultaneously
and shall be capable of decoding at least 288 capacity units.
4.4 Service selection
4.4.1 General
The main service channel (MSC) and the fast information channel (FIC) carry the components
and multiplex configuration information (MCI) respectively of the services which make up a
DAB ensemble.
Each service has one or more service components. Several services may be carried in one
ensemble. Service components may be audio or data. DAB, DAB+, DMB and data services all
may be present in the same ensemble.
A user of a DAB receiver accesses service components by selecting a service. Only services
that contain a primary service component that the receiver can decode shall be presented to
the user for selection.
– 14 – IEC 62104:2015 © IEC 2015
4.4.2 Requirements
To gain access to the desired service, the receiver shall decode the MCI, make the
information available to the man-machine interface (MMI) for selection, and then output the
selected service. Receivers shall actively decode and act upon changes in the signalled MCI.
Selecting a service which consists of a primary audio component with associated data
applications shall cause the data applications to be output automatically (provided the
receiver has the appropriate decoders), whether carried as PAD or as a secondary service
component in packet mode, with or without additional FEC.
If a device supports a specific data application type, then this data application type shall be
accessible to the user whether signalled as PAD (associated to an audio programme), as a
secondary service component or as a stand-alone data service.
For a multimedia receiver, service selection shall be provided by means of a service guide
populated with information from received service and programme information (SPI).
4.5 Receiver reactions to a multiplex reconfiguration
Information on a multiplex reconfiguration is provided in advance to the receiver by the use of
the change flags and occurance change field in FIG 0/0 and other MCI FIGs. This information
includes the following parts:
• the type of a forthcoming multiplex reconfiguration (sub-channel, service, both);
• the time when the receiver shall switch according to the MCI (occurance change);
• the next MCI.
The receiver shall follow the multiplex reconfiguration seamlessly (i.e. with no audible artifacts,
no loss of synchronisation, nor that any user interaction is needed, etc.) even if:
• the sub-channel of the currently decoded service component(s) is changed and/or the
packet address of a packet mode service component is changed;
• the bit rate and/or protection level is changed;
• the FEC level is changed (for packet mode service components);
• new service components are added or removed (as long as the currently decoded service
component is not removed).
In cases where an audio service is no longer available, a suitable information message and
audio silence shall be presented to the listener.
In cases where an audio secondary component is no longer available, the corresponding
primary audio service component shall be presented to the listener.
4.6 Audio decoder
4.6.1 General
The audio decoder function of a DAB receiver shall permit the decoding of DAB and DAB+
services.
The audio decoder function shall correctly handle audio streams with surround content as
described in ISO/IEC 23003-1:2007 (MPEG surround). Even if surround decoding is not
supported, receivers shall decode such audio streams as regular mono or stereo content
without any malfunction.
4.6.2 DAB services
The audio decoder shall conform to the subset of ISO/IEC 11172-3 as defined in
ETSI 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 scale factor-cyclic
redundancy check (ScF-CRC) as defined within ETSI 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 bitstreams corresponding to both 24 kHz and
48 kHz sampling frequencies.
It shall comply with ISO/IEC 11172-3 and ISO/IEC 13818-3 (bit-rates above 256 kbit/s are
optional).
4.6.3 DAB+ services
The audio decoder shall conform to the subset of ISO/IEC 14496-3 as defined in
ETSI TS 102 563 including the error concealment function in Annex A. If, for any reason, the
data stream cannot be decoded, the receiver shall mute.
The audio part shall be able to decode DAB+ bitstreams corresponding to all sampling
frequencies defined in ETSI TS 102 563.
4.7 Automatic switching to another ensemble
In order to allow service following of a particular DAB service, the ability of an automotive
DAB receiver to switch automatically to another ensemble is mandatory. Service following
shall be as described in ETSI TS 103 176. Receivers shall actively decode and act upon
changes to the service following information.
4.8 Response to conditional access (CA) services
4.8.1 General
In DAB some service components belonging to a service may be individually encrypted to
make these components incomprehensible for unauthorized users.
4.8.2 Requirements for DAB receivers without CA capabilities
These receivers shall not make encrypted service components available for selection.
Special care shall be taken in the transition from "unencrypted" to "encrypted". When this
occurs on one of the selected service components, the receiver shall mute the audio in the
case of an audio component. A data component shall continue to be decoded depending on
the capabilities of the receiver. In all cases where the encryption has changed, an appropriate
indication shall be given.
NOTE CA capabilities are optional.
4.9 Output for audio and other services
4.9.1 General
The DAB system provides both programme and data services.
Programme services are comprised of an audio primary service component and optionally
additional secondary service components. Each audio service component can also contain
programme associated data (PAD) which is used to convey information intimately linked to the
sound programme in terms of content and synchronization.

– 16 – IEC 62104:2015 © IEC 2015
Data services comprise non-audio primary service components and may optionally have
additional secondary service components.
4.9.2 Requirements
The DAB receiver shall output the audio signal to, for example, loudspeakers and/or provide
other outputs via one of the interfaces specified in Clause 5.
4.10 Display
4.10.1 Standard receiver
The display shall be capable of displaying all the characters from the "Complete EBU Latin
based repertoire" (= 0000 in ETSI TS 101 756).
For simple displays only (e.g. starburst), characters shall be displayed in the simplified form
indicated in ETSI TS 101 756 (for example by presenting accented characters as the
unaccented equivalent). However, manufacturers should be aware that these displays may
make text unintelligible in many languages.
4.10.2 Multimedia receiver
The display shall be capable of displaying all the characters from the extended RDS character
set (see Table E.2 of IEC 62106:2009) encoded using "Complete EBU Latin based repertoire"
(= 0000 in ETSI TS 101 756), "ISO/IEC 10646 using UCS-2 transformation format" (= 0110 in
ETSI TS 101 756) and "ISO/IEC 10646 using UTF-8 transformation format" (= 1111 in
ETSI TS 101 756).
The display shall have a graphics resolution of at least (320 × 240) pixels and a colour depth
of at least 8 bit.
4.11 Text labels
4.11.1 Standard receiver
The receiver shall display the service label when a primary audio component is selected. The
receiver shall display the service component label when a secondary audio component is
selected.
Receivers which have a display with more than one row of characters shall display the whole
of the dynamic label, when contained within
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