1、BRITISH STANDARD BS EN 62104:2007 Characteristics of DAB receivers ICS 33.160.20 BS EN 62104:2007 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Commi
2、ttee on 5 November 2001 BSI 2007 ISBN 978 0 580 60439 3 National foreword This British Standard is the UK implementation of EN 62104:2007, incorporating corrigendum August 2007. It supersedes BS EN 50248:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Comm
3、ittee EPL/100, Audio, video and multimedia systems and equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicat
4、ion. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Date Comments 31 December 2007 Implementation of CENELEC corrigendum August 2007 (which revises the EN foreword), and renumbering of BS EN 50248:2001 as BS EN 62104:2007EUROPEAN
5、 STANDARD EN 62104 NORME EUROPENNE EUROPISCHE NORM August 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC - Al
6、l rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62104:2007 E ICS 33.160.20 Supersedes EN 50248:2001 English version Characteristics of DAB receivers Caractristiques du rcepteur DAB Eigenschaften von DAB-Empfngern This European Standard was ap
7、proved by CENELEC on 2004-12-07. 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 na
8、tional 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 langu
9、age 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, S
10、pain, Sweden, Switzerland and United Kingdom. Incorporating corrigendum August 2007Foreword 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 A
11、cceptance 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) 200
12、2-02-01 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
13、 annex B is normative. _ By Technical Board decision D122/162 the text of the International Standard IEC 62104:2003, which is identical with EN 50248:2001, was approved by CENELEC as EN 62104 on 2004-12-07. As a consequence EN 50248:2001 is renumbered as EN 62104:2007. The following date was fixed:
14、latest date by which the existence of EN 62104 has to be announced at national level (doa) 2007-12-01 EN 62104:2007 2 Contents 1 Scope4 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 select
15、ion.7 4.3 Frequency bands .7 4.4 Service selection .7 4.5 Receiver reactions to a multiplex re-configuration8 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
16、 profiles (Minimum implementation of specified coding profiles).9 5 Interfaces 9 5.1 General.9 5.2 RF input9 5.3 Analogue audio interface EN 61938 9 5.4 Digital audio interface IEC 60958-3.9 5.5 Coded audio interface IEC 619379 5.6 General digital interface (F in Figure 1)10 5.7 Conditional access i
17、nterface.10 6 Options10 6.1 General.10 6.2 Receiver display10 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
18、 (normative) Characteristics of a Rayleigh channel.21 Annex C (informative) Bibliography .26EN 62104:2007 3 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- b
19、and 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 th
20、e 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
21、 publication referred to applies (including amendments). EN 50255, Digital Audio Broadcasting system Specification of the receiver data interface (RDI) EN 55013 1) , Limits and methods of measurement of radio disturbance characteristics of broadcast receivers and associated equipment (CISPR 13, mod)
22、 EN 55020 1) , 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 conn
23、ectors 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
24、 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 receiver
25、s. (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 o
26、f 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
27、11172-3, Coding of moving pictures and associated audio for digital storage media at up to 1,5 Mbit/s - Part 3: Audio1)An amendment concerning digital receivers is in preparation. 4 EN 62104:2007ISO/IEC 11172-4, Coding of moving pictures and associated audio for digital storage media at up to 1,5 Mb
28、it/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
29、(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,
30、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 ac
31、cording 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
32、 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
33、 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
34、).EN 62104:2007 5 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 Other Signal Sources (FM, Cassette,CD, DCC) RF Front End FFT, Demux & Channel Decoder Audio DecoderAudio Processing Packet Mode Decoder IF- A/D Ma
35、n Machine Interface (MMI) Digital Record / Play 9 Coded Audio Speakers L R DATA out L-Band terrestrial Band III RF Input PAD Card Reader Conditional Access 1 234 5 6 7 System Control FIC &TII Decoding Analog/Digital C A D F G H Display 8 Synchronization Timing I J System Bus EL-Band satellite 10 EN
36、62104:2007 6 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
37、 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
38、 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
39、 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
40、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
41、 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 compo
42、nents 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
43、 available to the MMI (Man Machine Interface) for selection, and then output the selected service.EN 62104:2007 7 4.5 Receiver reactions to a multiplex re-configuration Information on a multiplex reconfiguration is provided in advance, to the receiver. This information includes the following parts:
44、the level of a forthcoming multiplex reconfiguration. the time when the receiver has to switch according to the MCI (Multiplex Configuration Information). next MCI. The receiver shall follow the multiplex reconfiguration as described in ETSI TR 101 496-2. In cases where the service is unchanged by t
45、he reconfiguration, reception of that service should continue without any adverse effect. 4.6 Automatic switching to another ensemble In order to allow service following of a particular DAB service the ability of a mobile DAB receiver to switch automatically to another ensemble is mandatory. Service
46、 following should be as described in ETSI TR 101 496-2. 4.7 Response to conditional access (CA) services 4.7.1 Introduction In DAB some service components belonging to a service may be individually scrambled to make these components incomprehensible for unauthorised users. 4.7.2 Requirements for DAB
47、 receivers without CA capabilities These receivers shall either make scrambled service components unavailable for selection or indicate their presence together with the fact that they are scrambled and thus not accessible. Special care has to be taken in the transition from “unscrambled“ to “scrambl
48、ed“. When this occurs on one of the selected service components, the receiver shall mute the audio and give an appropriate indication. NOTE CA capabilities are optional (see clause 6.) 4.8 Output for audio and other services 4.8.1 Introduction The DAB system provides both programme and data services
49、. Programme services comprise of an audio primary service component and (optionally) additional secondary service components. Each audio service component can also contain PAD (Programme Associated Data) which is used to convey information intimately linked to the sound programme in terms of content and synchronisation. DRC (Dynamic Range Control) is an example of a PAD application. Data services comprise of non-audio p
