Help/UGens/Chaos/FBSineL.html

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  24 <p class="p1"><b>FBSineL<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span>feedback sine with chaotic phase indexing</b></p>
  25 <p class="p2"><br></p>
  26 <p class="p3"><b>FBSineL.ar(freq, im, fb, a, c, xi, yi, mul, add)</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p3"><span class="Apple-tab-span">     </span><b>freq</b> - iteration frequency in Hertz</p>
  29 <p class="p3"><span class="Apple-tab-span">     </span><b>im</b> - index multiplier amount</p>
  30 <p class="p3"><b><span class="Apple-tab-span">  </span>fb</b> - feedback amount</p>
  31 <p class="p3"><b><span class="Apple-tab-span">  </span>a<span class="Apple-converted-space"> </span></b> - phase multiplier amount</p>
  32 <p class="p3"><b><span class="Apple-tab-span">  </span>c</b> - phase increment amount</p>
  33 <p class="p3"><span class="Apple-tab-span">     </span><b>xi</b> - initial value of x</p>
  34 <p class="p3"><span class="Apple-tab-span">     </span><b>yi</b> - initial value of y</p>
  35 <p class="p4"><br></p>
  36 <p class="p3">A linear-interpolating sound generator based on the difference equations:</p>
  37 <p class="p2"><span class="Apple-tab-span">     </span></p>
  38 <p class="p3"><span class="Apple-tab-span">     </span>x<span class="s1"><sub>n+1</sub></span> = sin(im*y<span class="s1"><sub>n</sub></span> + fb*x<span class="s1"><sub>n</sub></span>)</p>
  39 <p class="p3"><span class="Apple-tab-span">     </span>y<span class="s1"><sub>n+1</sub></span> = (ay<span class="s1"><sub>n</sub></span> + c) % 2pi</p>
  40 <p class="p4"><br></p>
  41 <p class="p3">This uses a linear congruential function to drive the phase indexing of a sine wave.<span class="Apple-converted-space">  </span>For<span class="Apple-converted-space"> </span></p>
  42 <p class="p3"><b>im</b> = 1, <b>fb</b> = 0, and <b>a</b> = 1 a normal sinewave results.</p>
  43 <p class="p4"><br></p>
  44 <p class="p5">// default initial params</p>
  45 <p class="p6">{ <span class="s2">FBSineL</span>.ar(<span class="s2">SampleRate</span>.ir/4) * 0.2 }.play(s);</p>
  46 <p class="p4"><br></p>
  47 <p class="p5">// increase feedback</p>
  48 <p class="p6">{ <span class="s2">FBSineL</span>.ar(<span class="s2">SampleRate</span>.ir, 1, <span class="s2">Line</span>.kr(0.01, 4, 10), 1, 0.1) * 0.2 }.play(s);</p>
  49 <p class="p4"><br></p>
  50 <p class="p5">// increase phase multiplier</p>
  51 <p class="p6">{ <span class="s2">FBSineL</span>.ar(<span class="s2">SampleRate</span>.ir, 1, 0, <span class="s2">XLine</span>.kr(1, 2, 10), 0.1) * 0.2 }.play(s);</p>
  52 <p class="p4"><br></p>
  53 <p class="p5">// modulate frequency and index multiplier</p>
  54 <p class="p6">{ <span class="s2">FBSineL</span>.ar(<span class="s2">LFNoise2</span>.kr(1, 1e4, 1e4), <span class="s2">LFNoise2</span>.kr(1,16,17), 1, 1.005, 0.7) * 0.2 }.play(s);</p>
  55 <p class="p4"><br></p>
  56 <p class="p5">// randomly modulate params</p>
  57 <p class="p6">(</p>
  58 <p class="p7"><span class="s3">{ </span>FBSineL<span class="s3">.ar(</span></p>
  59 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">LFNoise2</span>.kr(1, 1e4, 1e4),<span class="Apple-converted-space"> </span></p>
  60 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">LFNoise2</span>.kr(1, 32, 33),<span class="Apple-converted-space"> </span></p>
  61 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">LFNoise2</span>.kr(1, 0.5),</p>
  62 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">LFNoise2</span>.kr(1, 0.05, 1.05),</p>
  63 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">LFNoise2</span>.kr(1, 0.3, 0.3)</p>
  64 <p class="p6">) * 0.2 }.play(s);</p>
  65 <p class="p6">)</p>
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