为了便于计算机辅助计算复杂的连续信号频谱，经常采用DFT方法。DFT不仅能反映信号的频域特征更便于用计算机处理。这里先对连续非周期信号做离散化处理，然后截短得到有限长序列，最后做DFT变换。针对常用信号DFT谱分析的原理及谱分析中的相关问题进行了较为深入的探讨，并结合实例用Matlab仿真软件进行了分析和验证。% In order to calculate the spectrum of complex continuous signal with the computer,the discrete Fourier trans⁃form(DFT) method is used normally. DFT can not only reflect the frequency domain characteristic of the signal,but also is more convenient for processing by computer. The discretization processing for continuous-time aperiodic signal is made first, then the obtained finite length sequences are cut short,finally DFT is done. A deep discussion in the principle and some related questions existing in DFT spectrum analysis of common signals is carried out in this paper. The simulation software Matlab is used to analyze and test the design.
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