📄 dtft_c.mht
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Date: Wed, 27 Sep 2006 22:46:29 +0800
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<BODY><PRE>/* dtft.c - DTFT of length-L signal at a single frequency w =
*/
#include <cmplx.h> /* complex =
arithmetic */
complex dtft(L, x, w) /* usage: =
X=3Ddtft(L, x, w); */
double *x, w; /* \(x\) is =
\(L\)-dimensional */
int L;
{
complex z, X;
int n;
z =3D cexp(cmplx(0, -w)); /* set =
\(z=3De\sp{-j\om}\) */
X =3D cmplx(0,0); /* initialize =
\(X=3D0\) */
for (n=3DL-1; n>=3D0; n--)
X =3D cadd(cmplx(x[n], 0), cmul(z, X));
return X;
}
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