📄 dir2_c.mht

📁 常用的DSP算法集锦

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Date: Wed, 27 Sep 2006 22:40:32 +0800
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<BODY><PRE>/* dir2.c - IIR filtering in direct form */

double dot();
void delay();

double dir2(M, a, L, b, w, v, x)          /* usage: y =3D dir2(M, a, L, =
b, w, v, x); */
double *a, *b, *w, *v, x;
int M, L;
{
       v[0] =3D x;                                 /* current input =
sample */
       w[0] =3D 0;                                 /* needed for =
dot(M,a,w) */

       w[0] =3D dot(L, b, v) - dot(M, a, w);       /* current output */

       delay(L, v);                              /* update input delay =
line */

       delay(M, w);                              /* update output delay =
line */

       return w[0];
}
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