?? fir1.c
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/* 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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