?? lowpass.c
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/* 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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