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26 <p class="p1"><span class="s1"><b>SOS<span class="Apple-tab-span"> </span><span class="Apple-tab-span"> </span></b></span><b>second order filter section (biquad)</b></p>
27 <p class="p2"><br></p>
28 <p class="p3"><span class="s2"><b>Inherits from: </b><a href="../../Core/Object.html"><span class="s3"><b>Object</b></span></a></span><b> : </b><a href="../../Core/Kernel/AbstractFunction.html"><b>AbstractFunction</b></a><b> : </b><a href="../UGen.html"><b>UGen</b></a><b> : </b><a href="../Filter.html"><b>Filter</b></a><b><span class="Apple-converted-space"> </span></b></p>
29 <p class="p2"><br></p>
30 <p class="p2"><br></p>
31 <p class="p1"><b>SOS.ar(in, a0, a1, a2, b1, b2, mul, add)</b></p>
32 <p class="p1"><b>SOS.kr(in, a0, a1, a2, b1, b2, mul, add)</b></p>
33 <p class="p2"><br></p>
34 <p class="p1">A standard second order filter section. Filter coefficients are given directly rather than calculated for you.</p>
35 <p class="p1">Formula is equivalent to:</p>
36 <p class="p2"><br></p>
37 <p class="p4">out(i) = (a0 * in(i)) + (a1 * in(i-1)) + (a2 * in(i-2))<span class="Apple-converted-space"> </span></p>
38 <p class="p4"><span class="Apple-tab-span"> </span>+ (b1 * out(i-1)) + (b2 * out(i-2))</p>
39 <p class="p2"><br></p>
40 <p class="p2"><br></p>
41 <p class="p5"><br></p>
42 <p class="p6">// example: same as TwoPole</p>
43 <p class="p7">(</p>
44 <p class="p7">{</p>
45 <p class="p7"><span class="Apple-tab-span"> </span><span class="s4">var</span> rho, theta, b1, b2;</p>
46 <p class="p7"><span class="Apple-tab-span"> </span>theta = <span class="s4">MouseX</span>.kr(0.2pi, pi);</p>
47 <p class="p7"><span class="Apple-tab-span"> </span>rho = <span class="s4">MouseY</span>.kr(0.6, 0.99);</p>
48 <p class="p7"><span class="Apple-tab-span"> </span>b1 = 2.0 * rho * cos(theta);</p>
49 <p class="p7"><span class="Apple-tab-span"> </span>b2 = rho.squared.neg;</p>
50 <p class="p7"><span class="Apple-tab-span"> </span><span class="s4">SOS</span>.ar(<span class="s4">LFSaw</span>.ar(200, 0, 0.1), 1.0, 0.0, 0.0, b1, b2)</p>
51 <p class="p7">}.play</p>
52 <p class="p7">)</p>
53 <p class="p8"><br></p>
54 <p class="p8"><br></p>
55 <p class="p7">(</p>
56 <p class="p7">{</p>
57 <p class="p7"><span class="Apple-tab-span"> </span><span class="s4">var</span> rho, theta, b1, b2;</p>
58 <p class="p7"><span class="Apple-tab-span"> </span>theta = <span class="s4">MouseX</span>.kr(0.2pi, pi);</p>
59 <p class="p7"><span class="Apple-tab-span"> </span>rho = <span class="s4">MouseY</span>.kr(0.6, 0.99);</p>
60 <p class="p7"><span class="Apple-tab-span"> </span>b1 = 2.0 * rho * cos(theta);</p>
61 <p class="p7"><span class="Apple-tab-span"> </span>b2 = rho.squared.neg;</p>
62 <p class="p7"><span class="Apple-tab-span"> </span><span class="s4">SOS</span>.ar(<span class="s4">WhiteNoise</span>.ar(0.1 ! 2), 1.0, 0.0, 0.0, b1, b2)</p>
63 <p class="p7">}.play</p>
64 <p class="p7">)</p>
65 <p class="p8"><br></p>
66 <p class="p6">// example with SOS.kr kr as modulator</p>
67 <p class="p7">(</p>
68 <p class="p7">{</p>
69 <p class="p7"><span class="Apple-tab-span"> </span><span class="s4">var</span> rho, theta, b1, b2, vib;</p>
70 <p class="p7"><span class="Apple-tab-span"> </span>theta = <span class="s4">MouseX</span>.kr(0.2pi, pi);</p>
71 <p class="p7"><span class="Apple-tab-span"> </span>rho = <span class="s4">MouseY</span>.kr(0.6, 0.99);</p>
72 <p class="p7"><span class="Apple-tab-span"> </span>b1 = 2.0 * rho * cos(theta);</p>
73 <p class="p7"><span class="Apple-tab-span"> </span>b2 = rho.squared.neg;</p>
74 <p class="p8"><span class="Apple-tab-span"> </span></p>
75 <p class="p7"><span class="Apple-tab-span"> </span>vib = <span class="s4">SOS</span>.kr(<span class="s4">LFSaw</span>.kr(3.16), 1.0, 0.0, 0.0, b1, b2);</p>
76 <p class="p7"><span class="Apple-tab-span"> </span>SinOsc.ar( vib * 200 + 600) * 0.2</p>
77 <p class="p7">}.play</p>
78 <p class="p7">)</p>
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