Help/Streams-Patterns-Events/Patterns/Pgbrown.html

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  28 <p class="p1"><span class="s1"><b>Pgbrown<span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>geometric brownian motion pattern</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p1">superclass: Pbrown</p>
  31 <p class="p2"><br></p>
  32 <p class="p1"><b>Pgbrown(lo, hi, step, length)</b></p>
  33 <p class="p2"><br></p>
  34 <p class="p1">Returns a stream that behaves like a geometric brownian motion.<span class="Apple-converted-space"> </span></p>
  35 <p class="p2"><br></p>
  36 <p class="p1"><b>lo, hi</b> - lower and upper boundary of values<span class="Apple-converted-space">  </span>(default: 0.0 and 1.0)</p>
  37 <p class="p1"><b>step</b> - maximum multiplication factor per step (omega) - the distribution is xrand2.<span class="Apple-converted-space">  </span>(default: 0.125)</p>
  38 <p class="p1"><b>length</b> - number of values produced (default: inf)</p>
  39 <p class="p2"><br></p>
  40 <p class="p2"><br></p>
  41 <p class="p3"><span class="s2"><b>See also:</b> <a href="../../UGens/Noise/BrownNoise.html"><span class="s3">BrownNoise</span></a>, <a href="Pbrown.html"><span class="s3">Pbrown</span></a></span></p>
  42 <p class="p2"><br></p>
  43 <p class="p4"><br></p>
  44 <p class="p5">// example</p>
  45 <p class="p4"><br></p>
  46 <p class="p6">(</p>
  47 <p class="p6"><span class="s4">var</span> a, b;</p>
  48 <p class="p6">a = <span class="s4">Pgbrown</span>(0.0, 1.0, 0.2, <span class="s4">inf</span>);</p>
  49 <p class="p6">b = a.asStream;</p>
  50 <p class="p6">7.do({ b.next.postln; });</p>
  51 <p class="p6">)</p>
  52 <p class="p4"><br></p>
  53 <p class="p4"><br></p>
  54 <p class="p5">// sound example</p>
  55 <p class="p6">(</p>
  56 <p class="p7"><span class="s5">SynthDef</span><span class="s2">(</span>\help_sinegrain<span class="s2">,<span class="Apple-converted-space"> </span></span></p>
  57 <p class="p6"><span class="Apple-tab-span">     </span>{ <span class="s5">arg</span> out=0, freq=440, sustain=0.05;</p>
  58 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s5">var</span> env;</p>
  59 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>env = <span class="s5">EnvGen</span>.kr(<span class="s5">Env</span>.perc(0.01, sustain, 0.2), doneAction:2);</p>
  60 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s5">Out</span>.ar(out, <span class="s5">SinOsc</span>.ar(freq, 0, env))</p>
  61 <p class="p6"><span class="Apple-tab-span">     </span>}).add;</p>
  62 <p class="p6">)</p>
  63 <p class="p4"><br></p>
  64 <p class="p4"><br></p>
  65 <p class="p4"><br></p>
  66 <p class="p6">(</p>
  67 <p class="p6"><span class="s5">var</span> a;</p>
  68 <p class="p6">a = <span class="s5">Pgbrown</span>(1.0, 2.0, 0.1, <span class="s5">inf</span>).asStream;</p>
  69 <p class="p8">Routine<span class="s2">({</span></p>
  70 <p class="p6"><span class="Apple-tab-span">     </span>loop({</p>
  71 <p class="p6"><span class="Apple-tab-span">     </span><span class="s5">Synth</span>(<span class="s6">\help_sinegrain</span>, [<span class="s6">\freq</span>, a.next * 600 + 300]);</p>
  72 <p class="p6"><span class="Apple-tab-span">     </span>0.02.wait;</p>
  73 <p class="p6"><span class="Apple-tab-span">     </span>})</p>
  74 <p class="p6">}).play;</p>
  75 <p class="p6">)</p>
  76 <p class="p4"><br></p>
  77 <p class="p5">// compare with normal brownian motion:</p>
  78 <p class="p4"><br></p>
  79 <p class="p6">(</p>
  80 <p class="p6"><span class="s5">var</span> a;</p>
  81 <p class="p6">a = <span class="s5">Pbrown</span>(1.0, 2.0, 0.1, <span class="s5">inf</span>).asStream;</p>
  82 <p class="p8">Routine<span class="s2">({</span></p>
  83 <p class="p6"><span class="Apple-tab-span">     </span>loop({</p>
  84 <p class="p6"><span class="Apple-tab-span">     </span><span class="s5">Synth</span>(<span class="s6">\help_sinegrain</span>, [<span class="s6">\freq</span>, a.next * 600 + 300]);</p>
  85 <p class="p6"><span class="Apple-tab-span">     </span>0.02.wait;</p>
  86 <p class="p6"><span class="Apple-tab-span">     </span>})</p>
  87 <p class="p6">}).play;</p>
  88 <p class="p6">)</p>
  89 <p class="p4"><br></p>
  90 <p class="p4"><br></p>
  91 <p class="p4"><br></p>
  92 <p class="p4"><br></p>
  93 <p class="p4"><br></p>
  94 <p class="p4"><br></p>
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