Achievement And Procession Of Infrasound Signal

Aiming at the achievement and procession of infrasoundsignal, this research designs the hardware's general structuraldiagram and the state flow chat of testing system. It introduces theprinciples of bridge and bridge balance. The process of adjustingbalance uses MathCAD to emulate, getting the range of theory'sadjusting balance. This paper also introduces dual port static storeand A-D 8343 converter, and designs the infrasound testing schematicdiagram. Based on the application of CPLD logic device, this researchrealizes the testing system's control logic with the use of CPLD.It introduces some key designs and emulations of logical controlcircuits. Moreover, it also presents the computer's line printterminal used by the testing and measuring system. It finishes the design of infrasound testing soft with theadoption of the mixed program of VB and VC, and it compiles the dynamiclink libraries of computer's line print terminal control by usingVC, it also uses VB to design software's operation interface andthe main routine. By using MATLAB to emulate the filtering, comparing theadvantages and disadvantages of different filter's designingmethods, and comparing filtering effects of different designparameter of filters. this research gets the filter's setting upparameter of the best filtering effects. It also introduces thewavelet theory, and it emulates the wavelet's analysis on signalsand denoise with MATLAB. Moreover, it compares the signal's analysisand denoise results by choosing different wavelet functions anddifferent entropy rules and wavelet levels, getting the bestparameter's setting through the use of wavelet to analyze signalsand denoise. At last, this research emulates and processes theinfrasound signal through program design and modular programmingdesign. And by the adoption of sound signal to examine the infrasoundit can obtain describable sound signal's relative magnitude ofphysical quantity.