Design And Realization Of DVB Monitor System

With the development of digital television, the digital video products and the broadcasting technique is being improved continuously. It is necessary to develop several of equipments for the sake of transparence in management of DTV and forming the mutual benefit in programming, transmission, serving and user. These equipments will be applied to every aspect in DTV broadcasting.The system introduced by this paper is the central multiplex DVB monitor system integrating RF receiver, ASI receiver, transport stream analyzing, MPEG decoding, multiplex menu display, switch of audio/video and server of network. The whole DVB system can be monitor and the function including malfunction analyzing, malfunction recording, autoalarm can be implemented by this system. User can realize tekecommunications by Ethernet to achieve the aim of management by network.The DVB system was summarized and the development of Digital TV in China was introduced in this paper firstly. Whereafter, the MPEG-2 Systems Specification was dissertated. The syntax of transport stream, program specific information (PSI), service information (SI) was expatiated in this part. The functions of the DVB monitor system and the hardware circuit of this system was introduced. The scheme to implement ASI receiver and transmitter, the realization of how to analyze and monitor transport stream is described in detail. Also the test results of the system were described. Finally the work and the disadvantage of the design were mentioned. The scheme to implement ASI receiver and transmitter only use FPGA to replace the scheme based on CY7B933 and CY7B923 of Cypress. The transport stream analyzing including extracting and displaying PSI, SI. Further more, according to DVB ETR290, the system is accomplished to monitor the transport stream and give the detailed description for the error information.