从信号处理的角度，通过对一维信号的离散傅里叶变换频谱dasa-signal processing from the point of view of one-dimensional signals in the discrete Fourier transform spectrum Dasa

从信号处理的角度，通过对一维信号的离散傅里叶变换频谱图特性进行研究，进而推广到二维，daolr-signal processing from the point of view of one-dimensional signals in the discrete Fourier transform spectrum characteristics, thus the promotion of two-dimensional, and daolr