📄 fir3_c.mht

📁 常用的DSP算法集锦

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Date: Wed, 27 Sep 2006 22:41:08 +0800
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<BODY><PRE>/* fir3.c - FIR filter emulating a DSP chip */

double fir3(M, h, w, x)
double *h, *w, x;
int M;
{                       =20
       int i;
       double y;

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

       for (y=3Dh[M]*w[M], i=3DM-1; i&gt;=3D0; i--) {
              w[i+1] =3D w[i];                     /* data shift =
instruction */
              y +=3D h[i] * w[i];                  /* MAC instruction */
              }

       return y;
}
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