三角形滤波器设置的代码看不懂
下面三角形滤波器设置的代码看不懂，请懂的朋友解释下。
/*设置滤波器参数输入参数：无输出参数：*FiltCoe1---三角形滤波器左边的系数 *FiltCoe2---三角形滤波器右边的系数 *Num ---决定每个点属于哪一个滤波器*/void m_InitFilt(float *FiltCoe1, float *FiltCoe2, int *Num){ int i,j; float Freq; int FiltFreq[m_FiltNum+1] = {0,100,200,300,400,500,600,700,800,900,1000, 1149,1320,1516,1741,2000,2297,2639,3031,3482,4000, 4595,5278,6063,6964,8001};//滤波器的中心频率 int BW[m_FiltNum+1]={100,100,100,100,100,100,100,100,100,100,124, 160,184,211,242,278,320,367,422,484,556, 639,734,843,969,1112};//滤波器的带宽 for(i = 0 ; i<= m_FFTLen/2 ; i++ ) { Num[i]=0;//初始化为0 } for(i = 0 ; i <= m_FFTLen/2 ; i++)//m_FFTLen 256 { Freq = m_FS * 1000.0F * (float)(i) / (float)(m_FFTLen); for(j = 0 ; j <m_FiltNum ; j++)//m_FiltNum = 25 { if(Freq >= (float)FiltFreq[j] && Freq <= (float)FiltFreq[j+1]) { Num[i] = j; if(j == 0) { FiltCoe1[i] = 0.0F; } else { FiltCoe1[i] = ((float)(FiltFreq[j]+BW[j])-Freq) / (float)(BW[j]); } FiltCoe2[i] = (Freq-(float)(FiltFreq[j+1]-BW[j+1])) / (float)(BW[j+1]); FiltCoe1[i] = FiltCoe1[i] * FiltCoe1[i];//平方 FiltCoe2[i] = FiltCoe2[i] * FiltCoe2[i]; break; } } }}