IEC 62104:2003 pdf – Characteristics of DAB receivers

IEC 62104:2003 pdf – 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 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 The following referenced documents are indispensable for the application of this document. 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: RF coaxial connectors with inner diameter of outer conductor 3 mm (0,12 in) with snap-on coupling – Characteristic impedance 50 ohms (Type SMB) IEC 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) 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 61606, Audio and audiovisual equipment – Digital audio parts – Basic methods of measurement of audio characteristics IEC 61937, Digital audio — Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 IEC 61938, Audio, video and audiovisual systems – Interconnections and matching values — Preferred matching values of analogue signals IEC 62105, Digital Audio Broadcasting system – Specification of the receiver data interface (RDI) 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
ETSI ETS 300 401, Systèmes de radiodiffusion – Radiodiffusion sonore numérique (DAB) vers les récepteurs fixes, mobiles ou portables ETSI TR 101 496-2, Radiodiffusion sonore numérique (DAB) – Guide et règles pour la mise en œuvre et le fonctionnement. Volume 2: Caractéristiques système ETSI TS 101 757, Radiodiffusion sonore numérique (DAB) – Essai de conformité pour DAB Audio Recommandation ITU-T O.151, Appareil de mesure du taux d’erreur fonctionnant au débit primaire et au-dessus COST 207, Radiocommunications numériques mobiles terrestre – COST 207, Commission des communautés européennes, Rapport final 14 mars 1984 – 13 septembre 1988, Office des publications officielles des Communautés européennes, Luxembourg, 1989 3 Termes et définitions Pour les besoins du présent document, les définitions suivantes s’appliquent. Les autres définitions, abréviations et symboles se rapportent uniquement au DAB, sauf spécification contraire. 3.1 récepteur DAB récepteurs destinés à recevoir et décoder des programmes transmis selon la spécification de l’ETSI ETS 300 401 relative au système DAB NOTE La figure 1 montre un exemple de schéma fonctionnel d’un récepteur DAB conformément à l’ETSI ETS 300 401 (à titre d’information seulement). 3.2 exigence minimale valeur la plus faible qu’il convient qu’un récepteur DAB satisfasse afin de pouvoir être appelé récepteur DAB. Elle tient compte des récepteurs de faible coût.
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 ETSI ETS 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 ETS 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). 4.2 Automatic mode selection 4.2.1 Introduction Four different transmission modes are defined: modes I, II, III and IV. Radiofrequency characteristics are described in ETSI ETS 300 401(see Clause 15). 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.