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1 format) audio programmes as well. Programme-associated data (PAD): DAB broadcast receivers can display text information in far greater detail than RDS, such as programme background facts, a menu of future broadcasts and complementary advertising information. Receivers attached to a small screen will display visual information such as weather maps or CD cover images. Information services: Services from sources other than the broadcasting station are included within the same channel for the user to access at will.
So, the choice fell on COFDM, which has since proven to be an excellent performer. A further important decision had to be made relating to the bandwidth of the DAB system. From a network and service area planning point of view as well as obtainable frequency spectrum perspectives, an ensemble of 16 programmes on one transmitter with the 7 MHz bandwidth of a TV channel proved to be much too inflexible, although in experiments it had provided very good performance in a multipath environment. Therefore, a considerable but reasonable reduction in transmission bandwidth was necessary.
One narrow-band system one single carrier spread-spectrum system one multicarrier OFDM system and one frequency-hopping system. All approaches were developed to an extent where – either through experimental evidence or at least by thorough simulation – a fair and valid comparison of the performance of the proposed solutions became possible. The period of selection of and decision for the best suited audio coding system and the most appropriate transmission scheme was a crucial moment in the history of the Eureka 147 consortium.