📄 lowpass_c.htm
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<BODY><PRE>/* lowpass.c - lowpass reverberator with feedback filter G(z) */
double tap(), can();
void cdelay();
double lowpass(D, w, p, M, a, b, v, x)
double *w, **p, *a, *b, *v, x; /* \(v\) = state vector for \(G(z)\) */
int D; /* \(a,b,v\) are \((M+1)\)-dimensional */
{
double y, sD;
sD = tap(D, w, *p, D); /* delay output is \(G(z)\) input */
y = x + can(M, a, M, b, v, sD); /* reverb output */
**p = y; /* delay input */
cdelay(D, w, p); /* update delay line */
return y;
}
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