📄 fir2_c.mht

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Date: Wed, 27 Sep 2006 22:40:57 +0800
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<BODY><PRE>/* fir2.c - FIR filter in direct form */

double dot();
void delay();

double fir2(M, h, w, x)                       /* Usage: y =3D fir2(M, h, =
w, x); */
double *h, *w, x;                             /* \(h\) =3D filter, \(w\) =
=3D state, \(x\) =3D input */
int M;                                        /* \(M\) =3D filter order =
*/
{                       =20
       double y;

       w[0] =3D x;                              /* read input */

       y =3D dot(M, h, w);                      /* compute output */

       delay(M, w);                           /* update states */

       return y;
}
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