TAILIEUCHUNG - DAV Nguyên tắc và các ứng dụng P6

Tham khảo tài liệu 'dav nguyên tắc và các ứng dụng p6', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Digital Audio Broadcasting Principles and Applications. Edited by Wolfgang Hoeg Thomas Lauterbach Copyright 2001 John Wiley Sons Ltd ISBNs 0-471-85894-3 Hardback 0-470-84170-2 Electronic 6 Collection and Distribution Networks HANS-JORG NOWOTTNE and LOTHAR TUMPFEL General Basic Requirements Operation of the broadband DAB system requires the continuous collection of service component data the formation of the respective ensemble multiplex data and their distribution to the transmitter sites of the single frequency network. This leads to a distributed synchronised real-time system encompassing both a collection and a distribution network. These networks are connected by the ensemble multiplexer device which is situated in between. Major differences between FM RDS and DAB network architectures are outlined in Figure . In contrast to FM RDS DAB broadcasters the service providers send service component and additional data not directly to transmitter sites but on to the ensemble provider who operates the ensemble multiplexer. Tasks to be fulfilled by a DAB ensemble multiplexer are numerous owing to expanded functionality in DAB as provision for the dynamic change of the ensemble configuration support of multicomponent services and enlarged on-air signalling compared to FM RDS. With respect to signalling it should be emphasised that all service providers and the ensemble provider have to share the FIC the common DAB signalling channel. Therefore provisions for dynamic signalling by service providers but also avoidance of interference or inconsistency of signalling data are important issues. Digital Audio Broadcasting Principles and Applications edited by W. Hoeg and T. Lauterbach 2001 John Wiley Sons Ltd. 148 Digital Audio Broadcasting Principles and Applications Figure Network architecture of DAB versus FM RDS In general co-operation among the different contributors to the DAB transmission signal has to be managed. This will normally be done based on .

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