1(ARESONVC-ALG
2(NAME "aresonvc")
3(ARGUMENTS ("sound_type" "s1") ("sound_type" "hz") ("double" "bw")
4           ("int" "normalization"))
5(LINEAR s1)
6(ALWAYS-SCALE hz)
7(START (MAX s1 hz))
8(TERMINATE (MIN s1 hz))
9(LOGICAL-STOP (MIN s1))
10(SAMPLE-RATE (MAX s1))
11(STEP-FUNCTION hz)
12(STATE ("double" "c3co" "exp(bw * -PI2 / s1->sr)")
13       ("double" "c3p1" "susp->c3co + 1.0")
14       ("double" "c3t4" "susp->c3co * 4.0")
15       ("double" "omc3" "1.0 - susp->c3co")
16       ("double" "c2" "0.0")
17       ("double" "c1" "0.0")
18       ("int" "normalization" "normalization")
19       ("double" "y1" "0.0")
20       ("double" "y2" "0.0;
21    hz->scale = (sample_type) (hz->scale * (PI2 / s1->sr))"))
22(DEPENDS ("c2" "hz" "c3t4 * cos(hz) / c3p1")
23         ("c1" "hz" "(normalization == 0 ? 0.0 :
24          (normalization == 1 ? 1.0 - omc3 * sqrt(1.0 - c2 * c2 / c3t4) :
25              1.0 - sqrt(c3p1 * c3p1 - c2 * c2) * omc3 / c3p1))"))
26(CONSTANT "c1" "c2" "c3co" "c3p1" "c3t4" "omc3" "normalization")
27(FORCE-INTO-REGISTER c3t4 c3p1 normalization omc3)
28(INNER-LOOP-LOCALS "            register double y0, current;")
29(INNER-LOOP "current = s1;
30            y0 = c1 * current + c2 * y1 - c3co * y2;
31            output = (sample_type) y0;
32            y2 = y1; y1 = y0 - current")
33)
34