The Transport Stream Analysis Research & Unlawful Signal Detection

With the development of the Broadcasting & Video network, the Monitoring System on DVB(Digital Video Broadcasting) is becoming more and more important.In the recent years, some of the TV channels Broadcasted by satellite are attacked by unlawful signal. It is commonly prevent the unlawful signal from attacking on the RF(Radio Frequency) part in DVB system. The DVB Delaying Monitoring System is designed for the TV station's broadcasting defending. It can block the forbidden information before it is broadcasted by the TV station devices.This system is a unlawful signal blocker based on the Transport Stream analysis. It can make realtime surveillance on several transport streams at the same time. It has anolog CVBS interface and Audio interface. The system also has the ASI(Asynchronous Serial Interface)for TS output. Once it has problems on the signal from satellites, the response time of the TV station can be prolonged when using the system, and it can change to the back program source automatically.The DVB Delaying Monitoring System has three main modules.The analys board is made for TS analysis and TS delay. The multi-pic board mixes the video signal from eight analys boards into one video and output. The freezing frame check and black screen check technology are used in this part. The control module is in charge of the communication and protocol translating.The TS analysis system has passed the test of NIM. It is helpful to the construction of the DVB security system.