Electromagnetic Compatibility Design And Implementation Of Terminal For Field Mobile Based On Wavelet Analysis

With the development of modern science and technology, electromagnetic pollution becomes more and more serious, EMI (Electromagnetic Interference, EMI) will reduce the performance of electronic devices, so have deviations from the expected target, and even make the equipment failure, or result in shortened life span, and in worst case may destroy the device. Meanwhile, the human living environment is also mingled with the electromagnetic environment, electromagnetic interference causes serious harm to human health, promulgation of standards, regulations or law are promulgated around the world for electromagnetic compatibility of electronic products to make a mandatory requirement. Therefore, the EMC(Electromagnetic Compatibility, EMC) issues of mobile terminal for field become increasingly prominent, how to reduce the electromagnetic interference in accordance with EMC standards, enrsure equipment work well, is a pressing problem; and how to reduce the adverse electromagnetic environment on the adverse impact of human life, is also an important issue.This thesis introduces the mobile terminal’s features and circuit design, studys in detail the mechanism of electromagnetic interference, analysis of transmission of electromagnetic interference for mobile terminal. Then makes mobile terminal’s whole hardware architecture design, detailed introduction to the hardware circuit, PCB board design method of electromagnetic compatibility, and motherboard configuration shielding and software suppression measures. Meanwhile, analyses wavelet theory describes wavelet denoising method, focusing on analysis of the wavelet threshold denoising algorithm, and then uses different the threshold algorithm in terminal’s audio signal background noise denoising.Finally, the mobile terminal for field were tested and analysed in the practical application to make the mobile terminal’s electromagnetic compatibility can be achieved.Practice shows that the mobile terminal in the design field, to focus on electromagnetic compatibility design can fully guarantee it’s reliability of electrical performance. The research has practical theory significance and application value for the mobile terminal’s electromagnetic compatibility.