Design And Implement Of The Emergency Broadcast System Based On CMMB Network

Our country is harmed by the natural disaster one of most serious national in the world. Floods, droughts, typhoons, earthquakes, dust storms, hail, tornadoes, cold damage, landslides, mudslides, forest and grassland fires that the common natural disaster has the varying degree occurrence in our country. Facing disaster's occurrence, the humanity did not have the effective technical method to perform at present to prevent or the elimination completely, but may adopt the effective guard and the appropriate handling measure, causes the losses the disaster to reduce to the smallest degree. Those natural disasters cause the economic loss approximately composes GDP (GDP) 3%~6% every year in our country. How to forewarn the information to transmit accurately promptly to the disaster birthplace, the greatest degree reduces the disaster to lose, becomes the important issue which present urgent needs to solve.Emergency broadcasting is the CMMB (China Mobile Multimedia Broadcasting) mobile digital multimedia broadcasting system to provide a business expansion in China. Emergency Broadcasting is known as a way for Mobile Multimedia System to broadcast emergent events to public. When emergency such as natural disasters, traffic accident, events about public health and safety occurs, resulting in heavy casualties or property losses, or even damage to environment and social, in a word, has become great threat to public safety, Emergency Broadcasting System of Mobile Multimedia System can provide a convenient way of informing people in danger. CMMB Emergency Broadcasting System transmit signals by means of satellites broadcasting, whose transmission couldn't be affected by geography barrier such as mountain or forest, shortens transmission time of disaster warning signals a lot, and can win valuable response time of these urgent public events. can be recognized as a concrete manifestation of construction of harmonious society.The state administration of radio film and television for the enhancement broadcast early warning ability, take Shanghai as an experiment site, has done the CMMB emergency broadcast information issue system construction work, combines to make or become initiated a project an item of group to carry on the development. The paper take this project as a background. Attempts to establish based on the CMMB network information issue system, when presents the national stipulation the emergency case and the thunderbolt, may realize to the user provides the urgent circular service, the urgent broadcast take the writing information as the basic mode, may expand ways and so on support audio frequency, picture, image, should realize multilingual and the multi-codes, adapts the national minority area and in the domestic foreign personnel, when front end transmits the urgent broadcast message, receives the terminal to be able cut the receive urgent broadcast message forcefully, and can act according to emergencies' rank and the type adopts the corresponding demonstration way to serve the early warning purpose.