Hierarchical modulation – a variant of the digital terrestrial television standard, DVB-T – has received relatively little attention to date in the planning processes. It enables the transmission of two independent DVB-T multiplexes on a single TV frequency channel, with different transmission qualities (high priority and low priority). The high-priority… (More)
This paper describes the design and implementation of PEDMS. Part B describes design objectives, resulting system architecture and interfaces to user and database administrator. Part C concentrates on the implementation of PEDMS, discussing the difficulties imposed by the environment, and the ways of circumventing these difficulties.