?? dir.c
字號(hào):
/* dir.c - IIR filtering in direct form */double dir(M, a, L, b, w, v, x) /* usage: y = dir(M, a, L, b, w, v, x); */double *a, *b, *w, *v, x; /* \(v,w\) are internal states */int M, L; /* denominator and numerator orders */{ int i; v[0] = x; /* current input sample */ w[0] = 0; /* current output to be computed */ for (i=0; i<=L; i++) /* numerator part */ w[0] += b[i] * v[i]; for (i=1; i<=M; i++) /* denominator part */ w[0] -= a[i] * w[i]; for (i=L; i>=1; i--) /* reverse-order updating of \(v\) */ v[i] = v[i-1]; for (i=M; i>=1; i--) /* reverse-order updating of \(w\) */ w[i] = w[i-1]; return w[0]; /* current output sample */}
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