Analysis of Signal Spectrum and Realization Based on MATLAB
Yang Hui-yin · Journal of Hunan Institute of Science and Technology · 2010
DFT is a Fourier Transform which is discrete both in time-domain and frequency-domain,it fits numerical calculation and has fast algorithm,so it is a common mathematical tool which can realize signal spectrum analysis with computer.This paper introduces the basic process of signal spectrum analysis with DFT,emphasizes the causes of error producing in spectrum analysis process and the main ways to decrease the analysis error,and lists the programs of spectrum analysis based on MATLAB.Through the comparison with the theory analysis,the problems of spectrum aliasing,spectrum leakage and picket fence effect are explained when using DFT to analyze signal spectrum,and the corresponding solution is presented.