小波去噪程序，调用matlab，db6基波，分解三次，用于声音处理，比一般滤波器要好用-Wavelet denoising procedure, call matlab, db6 fundamental decomposition three times, for sound processing, be easy to use than the average filter

matlab仿真有源滤波器，三相电源输入，树春进行了PWM调节，可以调试输出正确波形，有不错的仿真价值-Active filter, can output waveform correctly, three-phase power input and output using the PWM controller for adjustment, waveform is correct, is more accurate