📄 wavgeni_c.mht
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Date: Wed, 27 Sep 2006 22:44:14 +0800
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<BODY><PRE>/* wavgeni.c - wavetable generator (interpolation method) */
void gdelay2();
double wavgeni(D, w, A, F, q) /* usage: y =3D wavgeni(D, w, A, F, =
&q); */
int D; /* \(D\) =3D wavetable length */
double *w, A, F, *q; /* \(A\) =3D amplitude, \(F\) =3D =
frequency, \(q\) =3D offset index */
{
double y;
int i, j;
i =3D (int) *q; /* interpolate between =
\(w[i], w[j]\) */
j =3D (i + 1) % D; =20
y =3D A * (w[i] + (*q - i) * (w[j] - w[i]));
gdelay2(D-1, D*F, q); /* shift \(c =3D DF\) =
*/
return y;
}
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