Research And Implementation Of DMB Information Publishing Based On Broadcasting Website

As a new means of Digital Multimedia Broadcasting(DMB)to LCD intelligent terminal through DMB is a new information publishing technology in recent years.Because of its wide coverage and easy terminal management,DMB has obvious advantages in the field of public information.At present,the design mode of DMB in LCD terminal is to determine the data type and composite form in the publisher through the pre-designed UI.Therefore,in engineering applications,in order to meet the needs of users,there are many software versions and huge maintenance workload.In view of the above engineering problems,this thesis designs a DMB information publishing technology based on Web pushing,taking advantage of simplicity and portability of web pages.In the publisher,a website business module and a business processing module was designed.Website business module builds information management website through Web technology,and uses back-end technology to realize the function of automatically generating web pages and issuing instructions information.Business processing module cooperates with the existing launch software of the laboratory,obtains transmission queues from the database of website and encode by the Transparent Data Channel(TDC)based on DMB standard.Finally,transferred to the DMB system for publication.At the receiving,socket receiver and LCD Application module are designed.The socket receiver realizes the function of data receiving and remote control terminal switch through embedded development;LCD Application module is an application software based on Android development,which replaces the complex interface design by calling browser,thus compatible with most DMB application mode on LCD terminal,and then through TDC decoding,breakpoint continuation technology and processing the instructions sent by the publisher.which display web page data and the management of post-cache data,such as deletion,modification,etc.Finally,the whole system is tested and the results show that:(1)At 512 Kbps channel rate,500 KB web pages are displayed in 10 seconds,and 5 KB instruction information is implemented in 1 second.Because of the development of website business module,the whole system is simple to use and easy to manage etc,which fully meets the design requirements.(2)Receiving software runs for a long time on Android 4.4.2,dual-core CPU and 1GBRAM devices with poor performance.CPU utilization is between 50% and 60%,and running memory is between 90 and 105 MB.When PBER(Pseudo Bit Error Rate)is less than 50E-4,receiving terminal can parse and display all web pages.When PBER is larger than 200E-4,the receiving terminal can not receive data,but it can ensure the normal operation of the program by reading the cache file.Finally,it is proved that the whole system can work well under the condition of poor LCD performance and weak signal.