重点分析信号在时域中为矩形脉冲具有sinc函数的特点，以此为基础，探讨小波和傅里叶之间的变换关系，既是小波与傅里叶分析基础,也是图像处理方面的资料-Key analytical signal in the time domain characteristic of a rectangular pulse having a sinc function as a basis to explore the relationship between wavelet and Fourier transfo