Help/UGens/Filters/FOS.html

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  26 <p class="p1"><span class="s1"><b>FOS<span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span></b></span><b>first order filter section</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="p1"><b>FOS.ar(in, a0, a1, b1, mul, add)</b></p>
  31 <p class="p1"><b>FOS.kr(in, a0, a1, b1, mul, add)</b></p>
  32 <p class="p2"><br></p>
  33 <p class="p2"><br></p>
  34 <p class="p1">A standard first 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)) + (b1 * out(i-1))</p>
  38 <p class="p2"><br></p>
  39 <p class="p1">Examples:</p>
  40 <p class="p5"><br></p>
  41 <p class="p6">(</p>
  42 <p class="p7">// same as OnePole</p>
  43 <p class="p6">{<span class="Apple-tab-span">    </span><span class="s4">var</span> x;</p>
  44 <p class="p6"><span class="Apple-tab-span">     </span>x = <span class="s4">LFTri</span>.ar(0.4, 0, 0.99);</p>
  45 <p class="p6"><span class="Apple-tab-span">     </span><span class="s4">FOS</span>.ar(<span class="s4">LFSaw</span>.ar(200, 0, 0.2), 1 - x.abs, 0.0, x)</p>
  46 <p class="p6">}.play;</p>
  47 <p class="p6">)</p>
  48 <p class="p8"><br></p>
  49 <p class="p6">(</p>
  50 <p class="p7">// same as OneZero</p>
  51 <p class="p6">{<span class="Apple-tab-span">    </span><span class="s4">var</span> x;</p>
  52 <p class="p6"><span class="Apple-tab-span">     </span>x = <span class="s4">LFTri</span>.ar(0.4, 0, 0.99);</p>
  53 <p class="p6"><span class="Apple-tab-span">     </span><span class="s4">FOS</span>.ar(<span class="s4">LFSaw</span>.ar(200, 0, 0.2), 1 - x.abs, x, 0.0)</p>
  54 <p class="p6">}.play;</p>
  55 <p class="p6">)</p>
  56 <p class="p8"><br></p>
  57 <p class="p6">(</p>
  58 <p class="p7">// same as OnePole, kr</p>
  59 <p class="p6">{<span class="Apple-tab-span">    </span><span class="s4">var</span> x, ctl;</p>
  60 <p class="p6"><span class="Apple-tab-span">     </span>x = <span class="s4">LFTri</span>.kr(0.2, 0, 0.99);</p>
  61 <p class="p6"><span class="Apple-tab-span">     </span>ctl = <span class="s4">FOS</span>.kr(<span class="s4">LFSaw</span>.kr(8, 0, 0.2), 1 - x.abs, 0.0, x);</p>
  62 <p class="p6"><span class="Apple-tab-span">     </span><span class="s4">LFTri</span>.ar(ctl * 200 + 500);</p>
  63 <p class="p6">}.play;</p>
  64 <p class="p6">)</p>
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