📄 fir_c.mht

📁 常用的DSP算法集锦

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Date: Wed, 27 Sep 2006 22:40:44 +0800
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<BODY><PRE>/* fir.c - FIR filter in direct form */

double fir(M, h, w, x)                       /* Usage: y =3D fir(M, h, =
w, x); */
double *h, *w, x;                            /* \(h\) =3D filter, \(w\) =
=3D state, \(x\) =3D input sample */
int M;                                       /* \(M\) =3D filter order =
*/
{                       =20
       int i;
       double y;                             /* output sample */

       w[0] =3D x;                             /* read current input =
sample \(x\) */

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

       for (i=3DM; i&gt;=3D1; i--)                  /* update states for =
next call */
              w[i] =3D w[i-1];                 /* done in reverse order =
*/

       return y;
}
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