vb版本的fft变换，能够正反变换。正变换： 把时域信号转换成频域信号，反变换：能够把频域信号转换成时域信号。fft可广泛应用于工程领域，例如：信号的频域分析。震动，噪声的分析等等。-vb version of the fft transform, to transform pros. Transformation : put time domain signal into frequency domain signal, anti-transformation : can frequenc

数字信号处理的课程设计，关于用FFT作谱分析，用MATLAB做的-Digital signal processing of curriculum design, on the use of FFT for spectral analysis, using MATLAB to do

对信号做傅里叶变换和包络分析，适合初学者信号分析，简单易懂(Fourier transform and envelope analysis of the signal, suitable for beginners signal analysis, easy to understand)