中文说明：
小波变化是对傅里叶变换和短时傅里叶变换的一个突破，其改变就在于，将无限长的三角函数基换成了有限长的会衰减的小波。
English Description：
Wavelet change is the Fourier transform and short time Fourier transform is a breakthrough, the change is that the infinite long triangle function base with limited long will decay of the wavelet.