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Extraction of Human Cardiac Electric Signal from the Earthquake Ruins

LU Xia,WANG Xu-ben,GAO Song(College of Information and Engineering,Chengdu University of Technology,Chengdu 610059,China)  
The life detector based on the signal of cardiac electric field is now the most advanced life detector,but the difficulty is how to extract the weak signal of cardiac electric field effectively from earthquake ruins.In this paper the signal interference situation in earthquake disaster ruins that maybe affect human electric field is analyzed and the method of receiving weak ultra-low frequency electric filed signals in the ruins is put forward.According to the characteristics of human cardiac electric field,a special filters is designed for filtering off interference signals.Only the expansion 360° ultra-low-frequency non-uniform electric field which produced by beating human heart can be left.
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