实现各种滤波器和改进型

				/* blockcon.c - block convolution by overlap-add method */								void conv();								void blockcon(M, h, L, x, y, ytemp)				double *h, *x, *y, *ytemp;                    /* ytemp is tail of previous block */				int M, L;                                     /* \(M\) = filter order, \(L\) = block size */				{				    int i;								    conv(M, h, L, x, y);                      /* compute output block y */								    for (i=0; i				        y[i] += ytemp[i];                     /* add tail of previous block */				        ytemp[i] = y[i+L];                    /* update tail for next call */				        }				}