Service following is the term applied to maintaining the same audio or data content that the user has selected in varying reception conditions when travelling by car or train.
Many broadcast network topologies are possible; the tuned service may be carried on an ensemble with multiple tuning frequencies, on more than one ensemble, may carry common programming with other DAB services, and for audio services may also be carried on FM-RDS or another bearer.
The best service following experience for the listener is achieved when the broadcaster minimises the timing differences between different bearers, taking into consideration the different coding and decoding delays of the different systems. Reliable service following also requires that all the identifiers used are properly allocated in such a way as to make them unique within their respective scope.
Until DAB/DAB+ coverage has reached sufficient levels in all markets there must be provision for broadcasters to implement service following and linking from DAB-FM / FM-DAB, therefore allowing a seamless listening experience especially for digital radio on the move.
To assist broadcasters and ensure that receiver manufacturers worldwide implement service following correctly, WorldDAB has produced information to support on this process.
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