list.10.txt

This archive contains circuit diagram and text documents making up the design of audio spectrum anal

//*****************************************
//  Butterfly function
//  Input, output: x, y
//  x <- x + Wn[k]*y
//  y <- x - Wn[k]*y
//*****************************************
void Butterfly(cplx *x, cplx *y, int k)
{
        cplx tx,ty,tWy;

        tWy=cplx_mul(Wn[k],*y);
        tx=cplx_add(*x,tWy);
        ty=cplx_sub(*x,tWy);

        *x=tx;
        *y=ty;
}