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📄 dft_c.mht

📁 常用的DSP算法集锦
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Date: Wed, 27 Sep 2006 22:46:06 +0800
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<BODY><PRE>/* dft.c - N-point DFT of length-L real-valued signal */

#include &lt;cmplx.h&gt;                               /* complex =
arithmetic */

void dtftr();                                    /* DTFT's over a =
frequency range */

void dft(L, x, N, X)                             /* usage: dft(L, x, N, =
X); */
double *x;                                       /* \(x\) is =
\(L\)-dimensional real */
complex *X;                                      /* \(X\) is =
\(N\)-dimensional complex */
int L, N;
{
       double pi =3D 4 * atan(1.0);

       dtftr(L, x, N, X, 0.0, 2*pi);             /* \(N\) frequencies =
over \([0,2\pi)\) */
}
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