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DIGITAL RADIO GUIDE APPENDIX A: EUREKA 147
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Figure A.1 below shows the architecture of DAB Java.
Figure A.1
The development and implementation of DAB Java requires close cooperation of content, service,
network providers and terminal manufacturers.
DAB Receiver Interfaces
In order to introduce new applications in the mature market with millions of DAB receivers
deployed, it is essential to allow the legacy receivers to connect to the new application decoders
via an agreed interface. To this end, The WorldDAB Forum has developed a specification for the
Receiver Data Interface (RDI).
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Nevertheless, as RDI has some technical limitations (e.g.
flexibility, fixed bandwidth), it has been decided to develop a new interface. The WorldDAB Forum
and the DRM Forum have agreed to cooperate in defining a generic physical USB interface for all
digital radio receivers. Furthermore, a generic low level driver interface based on Digital
Command Set for Receivers (DRCS) specification will be developed, taking into account of copy
protection and digital rights management issues.
Conditional Access
The DAB system already includes a comprehensive conditional system (see Chapter 9 of EN 300
401). Further work is now underway to develop a simple, yet reliable system to be used in
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EN 50255 Digital Audio Broadcasting system; Specification of the Receiver Data Interface (RDI), CENELEC