📄 tapi2_c.mht
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Date: Wed, 27 Sep 2006 22:35:35 +0800
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<BODY><PRE>/* tapi2.c - interpolated tap output of a delay line */
double tap2();
double tapi2(D, w, q, d) /* usage: sd =3D tapi2(D, w, =
q, d); */
double *w, d; /* \(d\) =3D desired =
non-integer delay */
int D, q; /* \(q\) =3D circular offset =
index */
{
int i, j;
double si, sj;
i =3D (int) d; /* interpolate between =
\(s\sb{i}\) and \(s\sb{j}\) */
j =3D (i+1) % (D+1); /* if \(i=3DD\), then =
\(j=3D0\); otherwise, \(j=3Di+1\) */
si =3D tap2(D, w, q, i); /* note, \(s\sb{i}(n) =3D =
x(n-i)\) */
sj =3D tap2(D, w, q, j); /* note, \(s\sb{j}(n) =3D =
x(n-j)\) */
return si + (d - i) * (sj - si);
}
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