📄 ccan2_c.mht

📁 常用的DSP算法集锦

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Date: Wed, 27 Sep 2006 22:37:26 +0800
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<BODY><PRE>/* ccan2.c - circular buffer implementation of canonical =
realization */

void wrap2();                        /* defined in Section =
\ref{hardware.sec} */

double ccan2(M, a, b, w, q, x)
double *a, *b, *w, x;                /* q =3D circular pointer offset =
index */
int M, *q;                           /* a,b have common order M */
{
       int i;
       double y =3D 0;

       w[*q] =3D x;                               /* read input sample x =
*/

       for (i=3D1; i&lt;=3DM; i++)
              w[*q] -=3D a[i] * w[(*q+i)%(M+1)];

       for (i=3D0; i&lt;=3DM; i++)
              y +=3D b[i] * w[(*q+i)%(M+1)];

       (*q)--;                                  /* update circular delay =
line */
       wrap2(M, q);

       return y;                                /* output sample */
}
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