📄 csos_c.mht

📁 常用的DSP算法集锦

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Date: Wed, 27 Sep 2006 22:39:29 +0800
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<BODY><PRE>/* csos.c - circular buffer implementation of a single SOS */

void wrap();

double csos(a, b, w, p, x)                      /* \(a,b,w\) are =
3-dimensional */
double *a, *b, *w, **p, x;                      /* \(p\) is circular =
pointer to \(w\) */
{
       double y, s0;

       *(*p) =3D x;                               /* read input sample =
\(x\) */

       s0  =3D *(*p)++;           wrap(2, w, p);
       s0 -=3D a[1] * (*(*p)++);  wrap(2, w, p);
       s0 -=3D a[2] * (*(*p)++);  wrap(2, w, p);

       *(*p) =3D s0;                              /* \(p\) has wrapped =
around once */

       y  =3D b[0] * (*(*p)++);  wrap(2, w, p);
       y +=3D b[1] * (*(*p)++);  wrap(2, w, p);
       y +=3D b[2] * (*(*p));                     /* \(p\) now points to =
\(s\sb{2}\) */

       return y;
}
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