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📄 dir_c.mht

📁 常用的DSP算法集锦
💻 MHT
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Date: Wed, 27 Sep 2006 22:40:20 +0800
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dgb2312">
<META content=3D"MSHTML 6.00.2900.2963" name=3DGENERATOR></HEAD>
<BODY><PRE>/* dir.c - IIR filtering in direct form */

double dir(M, a, L, b, w, v, x)           /* usage: y =3D dir(M, a, L, =
b, w, v, x); */
double *a, *b, *w, *v, x;                 /* \(v,w\) are internal states =
*/
int M, L;                                 /* denominator and numerator =
orders */
{
       int i;

       v[0] =3D x;                          /* current input sample */
       w[0] =3D 0;                          /* current output to be =
computed */

       for (i=3D0; i&lt;=3DL; i++)               /* numerator part */
              w[0] +=3D b[i] * v[i];

       for (i=3D1; i&lt;=3DM; i++)               /* denominator part */
              w[0] -=3D a[i] * w[i];

       for (i=3DL; i&gt;=3D1; i--)               /* reverse-order =
updating of \(v\) */
              v[i] =3D v[i-1];

       for (i=3DM; i&gt;=3D1; i--)               /* reverse-order =
updating of \(w\) */
              w[i] =3D w[i-1];

       return w[0];                       /* current output sample */
}
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