门信号的波形及其频谱；付里叶变换的对称特性-Gate signal waveform and its spectrum Fourier transform symmetry properties

傅里叶光学。 光学衍射 透镜 理论和实验(A complete descr iption of the imaging system, however, requires the wave properties of light and associated processes like diffraction to be included. It is these processes that determine the resolution of optical devices, t

matlab实验，离散傅里叶变换性质，滤波器设计(Matlab experiment, discrete Fourier transform properties, filter design)