信号序列的DFT本身就是信号频谱的采样集，所以DFT可直接用于分析信号的频谱。快速傅立叶变换是一种有

效、实用的信号DFT算法。文章通过对DIT－FFT算法的详细分析，提出了一种计算机软件仿真信号频谱分析方案，并给出了

关键算法的C 语言程序。-Signal sequence of the DFT spectrum of the sample itself is a set of signals, so the DFT can be directly used to analyze the signal spectrum. Fast Fourier Transform is an effective and practical signal DFT algorithm. By DIT-FFT algorithm for detailed analysis, a simulated signal spectrum analysis computer software program, and gives the key algorithm C language program.