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DAV Nguyên tắc và các ứng dụng P4

Tham khảo tài liệu 'dav nguyên tắc và các ứng dụng p4', 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 4 Data Services and Applications ROLAND PLANKENBÜHLER BERNHARD FEITEN and THOMAS LAUTERBACH 4.1 General While DAB development started mainly focused on audio broadcast data capabilities have been designed into the system right from the beginning. After successful presentations of the new digital audio broadcast system at the beginning of the 1990s these data capabilities gained more and more interest and prototype data services were demonstrated by different project partners of Eureka 147 the related events e.g. at NAB in Las Vegas Spring 1992 . In order to harmonise these prototype data services and to reach compatibility between the equipment and services data interfaces protocols and applications were defined to match the needs of broadcasters service providers and end users. In the meantime it is generally accepted that the usage of some DAB channel capacity especially for multimedia data services is crucial both for user acceptance and for the financing of the networks of this new digital broadcast medium. All the necessary hooks are available to follow this route. 4.2 Multimedia Applications with MOT 4.2.1 The Multimedia Object Transfer Protocol 4.2.1.1 General Principles The Multimedia Object Transfer MOT Protocol EN 301234 is a transport protocol for the transmission of multimedia content in DAB data channels to various receiver types with multimedia capabilities. It is the common transport mechanism for transmitting information Digital Audio Broadcasting Principles and Applications edited by W. Hoeg and T. Lauterbach 2001 John Wiley Sons Ltd. 102 Data Services and Applications via different DAB data channels PAD packet mode to unify access to multimedia content within the DAB system. MOT ensures interoperability between different data services and application types .