快速小波变换，相当于小波工具箱的waverec2-Fast wavelet transform, which is equivalent to wavelet toolbox waverec2

对比验证waverec2 和 waveback的计算时间，证明两种指令在同样结果下的计算量-Comparative validation computation time waverec2 and waveback prove two commands in the same amount of computation results