📄 cfir2_c.mht

📁 常用的DSP算法集锦

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Date: Wed, 27 Sep 2006 22:39:06 +0800
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<BODY><PRE>/* cfir2.c - FIR filter implemented with circular delay-line =
buffer */

void wrap2();

double cfir2(M, h, w, q, x)
double *h, *w, x;                                /* \(q\) =3D circular =
offset index */
int M, *q;                                       /* \(M\) =3D filter =
order */
{                       =20
       int i;
       double y;

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

       for (y=3D0, i=3D0; i&lt;=3DM; i++) {               /* compute =
output sample \(y\) */
              y +=3D (*h++) * w[(*q)++];
              wrap2(M, q);
              }

       (*q)--;                                   /* update circular =
delay line */
       wrap2(M, q);
      =20
       return y;
}
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