Research And Development Of Intelligent Emergency Notification System Apply To Basic Scene

Establish a set of intelligent emergency notification system, make the twokey problems “whether response in the first time” and " use what method to notifyeveryone in the risk area" can be completely resolved, provide strong support toenhance the whole society’s emergency security rescue capability through technicalmethod and technical means, has obvious public properties.The thesis based on the shortcomings of traditional emergency commandvehicle that can not arrived at the base field in the first time of the accident,costhighly, general company can not afford to pay, rely on PA broadcast system andwireless intercom system that widespread popularity in society, use of modernelectronic technology and computer control technology, in the premise of notaffecting the original functions, develop it into emergency notification system whichcan effectively deal with the emergency security incident based on scene. Thesystem not only low cost, easy to promote, and very flexible to use, in line with thecharacteristics of basic field crowded smaller.The thesis describes emergency notification system research purpose,advantages, features and development prospects. At the same time, Research on thekey technology of wireless walkie talkie communication, speech denoisingalgorithm under strong background noise and so on. Set up the basic structure of thesystem, clearing the necessary resources, according to the design demand clear withthe production of the system required for microprocessors, wireless walkie talkie,preamplifier and other resources. Finally, summarize, analyze, propose a feasibilityplan for some of the problem. encountered that the system in use process. The mainwork and innovatory of this paper are as follows:（1） With HKT-80BK wireless intercom module, STC12C5A60S2microprocessor device, self-control wireless transmitting and receiving device.Through the research on AT communication instructions inside, use short messagesend function, making the serial communication agreement, realize remote control eight road area broadcast system by wireless intercom. The experimental resultsshow that based on the existing wireless intercom and PA broadcast equipment setup emergency notification system has strong feasibility.（2） In order to improve the quality of emergency speech signal, study how toextract useful voice signal when existed strong background interference inMATLAB simulation platform. Compared with the adaptive filtering, notch filtering,after combining with the adaptive filter and blind speech separation algorithm, theSNR were increased respectively by10.78and8.55dB, the correlation coefficientwere increased0.245and0.235respectively, the RMSE were reduced by0.020,0.017respectively. Simulation data indicate that the improved denoising algorithmhas improved at the theoretical level to some extent, play a certain reference role inorder to realized by hardware for the following.（3） Selected the market KENWOOD TK-U100FM mature handheld walkietalkie, Hushan professional pre amplifier QF2306、TX_SDMP3₂20voice storagemodule build system. Identified the password information received by wirelessintercom based on STM32microcontroller, effective control total power, fire strongcutting power, made the system has the function of emergency start, channelallocation, store emergency voice signal. Through the touch screen interface,system’s1-5bit start and turn off password can be set flexibly.（4） Treat school as simulation scene of the accident, reference Agilent8594Espectrum analyzer, AH-5432radio tester and other equipment, the system wasfurther field function test. The test results show that, the system response time is lessthan3s, the normal communication distance can be up to about3km,comprehensive coverage, no communication blind area, speech signal is clear,ensure the SNR is over80dB, call safety, without interference. In addition, need tofurther study and improve the wireless interphone permission. At the same time, inview of such as underground parking and other special occasions, required to layoutantenna distribution system, to solve the basement of the signal shielding.