| Our country is located at the junction of the circum-Pacific seismic belt and the Mediterranean - Himalayan seismic belt, and under the effect of the northwest subducting of Pacific plate and Philippine Plate and the pushing of Indian Ocean plate, earthquakes happen frequently and violently and cause serious destructions to our country. Generally, seismic activities in our country are featured by high frequency, heavy intensity, wide distribution, shallow epicenter and high hazard rate.Currently, with the rapid development of urbanization, the densities of population and buildings are high in metropolis, high-rises and lifeline facilities increase day by day, and the result is, once moderate destructive earthquakes happen, the country and human life and property will suffer huge losses, and social economic chaos may also be aroused. The primary task of earthquake prevention and disaster reduction is mitigation of losses caused by the earthquake to the maximum extent. However, our country is years behind in the research and production of earthquake rescues technologies and equipment, so many rescue equipment are useless in the actual rescue process. On the basis of current equipment, discovery of defects of rescue equipment and improvement of performances of the equipment by using of new technologies and new methods are imperative.The study of this subject is carried out on the basis of adequate understanding and tests of research prototype of"micro audio life detection system". Based on the multiple tests, this subject put forwards the design plans for the data transmission and storage system of audio life detector. The overall objective is to improve coverage range of original wireless data transmission. In the new plan, radio frequency chips of high integration are utilized to extend the searchable range of the rescue equipment greatly; AMBE algorithm is adopted to compress and code a great deal of audio information, and with the help of file system, storage and playback of multi-channel audio information collected onsite can be realized; rescue workers can play and analyze the information repeatedly to improve the efficiency of rescue.The system consists of detection ball and receiving terminal. The detection ball is mainly composed of RF module, audio module, master module and power module. The audio module is mainly responsible for collection of audio data, as well as reestablishment and output of audio data; the master module is mainly responsible for control of all equipment, task scheduling and control of communication protocols; the RF module is mainly responsible for transmission and receiving of audio data and verification of the data received; the power module is mainly responsible for voltage switchover and power supply of all modules in the system. On the basis of detection ball, memory module and man-machine interface are added to form the receiving terminal, which is responsible for channel selection and monitoring of all detection balls, as well as storage and playback of data.This paper mainly concerns about the current development of rescue equipment, studies the voice compression algorithm, completes design and research of all modules in the system, drafts functional test board, completes software debugging of the system, and basically realizes expected functions. |
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