| With the development of digital technology, network technology andmultimedia technology, the broadcast television system is developingtoward the direction of digitalization. After the video network that is on thebasis of Hybrid Fiber Coaxial achieves digitalization, it can deliver not onlythe audio and video information, but also various multimediacomprehensive information,such as pictures, letters and data which are norelation with audio and video program. This is a new application of thevideo broadcast. The paper makes use of the new characteristics of thebroadcast televiseon system and use data encapsulation method of the datacarousel provided by Data Video Broadcast standard to realize the broadcastabout letter and data etc.The achieved Data Carousel Delivery System in the paper is mainlycomposed of two sections: database and transmission interface. Databasesupports man-machine mutual interface and conserves various datainformation input by user. While designing, Database is divided into severalmodules to adapt different contents, furthermore there are differenceinterfaces according to difference modules. In these interfaces, a user justneeds to input some necessary information according to requirement. Thisinformation will be delivered in the Data Carousel as contents in the future;Transmission interface is mainly used to neaten and pack the datainformation conserved in the database according to DVB standard. Thisprocess needs three times data encapsulation. The data information indatabase will form the independent TS during the three times dataencapsulation, which is the preparation of delivering and multiplying TS, inother words, the transmission interface is the bridge between inputting dataand delivering data. As to TS, we use the existing analytical softwareEPG_dump to carry on the analysis. The results are very right, which provesthat the data encapsulation method used in the paper is completely right. |
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