📄 allpass_c.mht
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Date: Wed, 27 Sep 2006 22:34:39 +0800
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<BODY><PRE>/* allpass.c - allpass reverberator with circular delay line =
*/
double tap();
void cdelay();
double allpass(D, w, p, a, x) /* usage: =
y=3Dallpass(D,w,&p,a,x); */
double *w, **p, a, x; /* \(p\) is passed by =
address */
int D;
{
double y, s0, sD;
sD =3D tap(D, w, *p, D); /* \(D\)th tap delay =
output */
s0 =3D x + a * sD;
y =3D -a * s0 + sD; /* filter output */
**p =3D s0; /* delay input */
cdelay(D, w, p); /* update delay line */
return y;
}
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