fir_c.htm
来自「FIR 滤波器 C语言程序,可用于算法仿真,非常有用.」· HTM 代码 · 共 26 行
HTM
26 行
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<BODY><PRE>/* fir.c - FIR filter in direct form */
double fir(M, h, w, x) /* Usage: y = fir(M, h, w, x); */
double *h, *w, x; /* \(h\) = filter, \(w\) = state, \(x\) = input sample */
int M; /* \(M\) = filter order */
{
int i;
double y; /* output sample */
w[0] = x; /* read current input sample \(x\) */
for (y=0, i=0; i<=M; i++)
y += h[i] * w[i]; /* compute current output sample \(y\) */
for (i=M; i>=1; i--) /* update states for next call */
w[i] = w[i-1]; /* done in reverse order */
return y;
}
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