File Push And Receiving System Based On DMB

Digital Multimedia Broadcasting(DMB)has its own broadcast intrinsic advantages which make the release system structure simple,maintenance easy and ability of resisting disaster strong.With the development of the digital technology,the information has been transform text and audio into image,video and other multimedia forms.These transformations make data volume huge.They are the challenges for the limited bandwidth of DMB to transmit.Aiming at the above problems,combined with the characteristics of the public information release system,this thesis researches the method of push files and its application to improve the channel utilization.For the release information which have no need to releasing in real-time,this thesis designs a file push method.This thesis also develop two kinds of public applications: LCD screen application and LED screen application,which are the important apartments of public receiving system.This thesis has:(1)designed a file push method which adapt to the public releasing system,which uses data high-performance codec which is based on standard DMB Transparent Data Channel(TDC)protocol to make the data receiving high;(2)studied the implementing method of automatic broadcasting and receiving,which based on terminal identification technology and long-distance control technology,to make the transmitting terminal take the right of system control and make the receiving terminals receive program obligatory and automatic;(3)developed the applied software and receiving terminals which are the important part of automatic receiving DMB system,including the client software which use to broadcast and control the push program,and the Windows terminals and embedded Linux terminals which to drive the LCD screen,and the LED screen driver based on MCU.Use the DMB client software to connect the server of DMB transmit system through the network,and upload a variety of push data content which transmitted by transmitter.The receiving terminals are also used to test the system's function.The test results show that the receiving terminal is stable,broadcast control functions and the content are correct.And it is useful for raising the channel utilization that the receiving and playback function are asynchronous.