Research And Design Of Digital Emergency Broadcast System Based On TCP/IP Protocol

In recent years,natural disasters and public health incidents have occurred frequently in China,and these public emergencies have put forward higher requirements for the emergency handling capacity and emergency management of the whole society.As a timely,effective,and convenient early warning method for emergencies,the emergency broadcast is an important part of China’s emergency management system.With the development of digital technology and the advancement of the triple-play integration projects,digital emergency broadcast based on network transmission has broad application prospects.In order to build a timely,stable,and efficient emergency broadcast system to ensure the safety of people’s lives and properties to the greatest extent,this paper relies on the Internet to design a digital emergency broadcast system based on TCP/IP protocol,and the main research works are as follows:(1)Since the emergency broadcast system has high requirements for voice transmission efficiency,an emergency broadcast speech compression algorithm based on wavelet transform and K-SVD dictionary learning is proposed.First,multi-scale analysis of the speech signal by wavelet transform extracts the low-frequency component and high-frequency component of the speech signal,respectively,for targeted processing: the high-frequency component containing speech detail information is not transmitted but directly discarded,and a similar high-frequency random signal is generated instead of wavelet synthesis,which can improve the compression efficiency by double.The low-frequency components containing the main information of speech are compressed and sampled by compressed sensing technology,and the overcomplete dictionary trained by the K-SVD dictionary learning algorithm replaces the traditional sparse dictionary to sparse it,and the improved compressed sensing reconstruction algorithm is used to reconstruct it at the receiving end,which can ensure the reconstruction quality of speech.Then,the two reconstructed components are synthesized into wavelets to obtain the reconstructed speech signal.Finally,the performance of the proposed compressed sensing reconstruction algorithm and the emergency broadcast speech compression algorithm is verified by experiments,and the results show that the proposed algorithm performs better than the comparison algorithm.(2)Design the emergency broadcast system node,and complete the design of the playback terminal of the digital emergency broadcast system based on TCP/IP protocol.According to the functional requirements of the playback terminal,the hardware framework of the playback terminal of the emergency broadcast system is given,and the hardware of the playback terminal is divided into a control operation unit,a network communication unit,voice output unit,human-computer interaction unit,and other units according to different functions,and the hardware circuit of each unit is designed respectively,so as to realize the design of the overall hardware part of the emergency broadcast system;Then,the main program operation process of the playback terminal of the emergency broadcast system is designed in detail,and then the software design is specifically for the network communication unit and voice processing unit,and finally the design of the software part of the playback terminal is completed.The emergency broadcast system was tested as a whole,and the designed digital emergency broadcast system based on TCP/IP protocol met the expected requirements.(3)Drawing on the overall plan for the construction of the national emergency broadcast system,a reference system of the emergency broadcast system based on Internet transmission is proposed.Considering the construction of the Internet in China,relying on the Internet to build an emergency broadcast system,dividing emergency information sources and emergency broadcast platforms into national,provincial,municipal,and county levels,and directly connecting with relevant government departments and institutions,which is conducive to authoritative information release and broadcast resource scheduling,and truly achieving unified linkage and efficient coordination.