分形算法 图形特效，可随音乐变化，完整VC代码-fractal algorithm graphics effects, which can change music, complete VC code

本文是用矩形窗法设计FIR带通滤波器,来滤除音乐信号的噪声,(This article is to use the rectangular window method to design FIR bandpass filter, to filter out the noise of the music signal,)