wavelet

代码说明：

  这种小波构造方式适合于各种DB系列的小波，但面对db6等比较长的小波，则均衡器的权长要足够长(Wavelet way that is suitable for a variety of wavelet DB series, but in the face of such a long db6 wavelet, it' s the right balance should be sufficiently long length)