Help/UGens/Analysis/RunningSum.html

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  21 <p class="p1"><span class="s1"><b>RunningSum<span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>running sum over n frames</b></p>
  22 <p class="p2"><br></p>
  23 <p class="p1">A running sum over a user specified number of samples, useful for running RMS power windowing.<span class="Apple-converted-space"> </span></p>
  24 <p class="p2"><br></p>
  25 <p class="p2"><br></p>
  26 <p class="p1"><b>*ar(in, numsamp)</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p1"><b>in<span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b>Input signal</p>
  29 <p class="p1"><b>numsamp</b> <span class="Apple-tab-span">      </span>How many samples to take the running sum over<span class="Apple-converted-space"> </span></p>
  30 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>(initialisation time only, not modulatable. default: <b>40</b>)</p>
  31 <p class="p2"><br></p>
  32 <p class="p3"><span class="Apple-tab-span">     </span></p>
  33 <p class="p3"><br></p>
  34 <p class="p4">// distorts of course - would need scaling<span class="Apple-tab-span">   </span></p>
  35 <p class="p5">{ <span class="s2">RunningSum</span>.ar(<span class="s2">SoundIn</span>.ar) }.play<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span></p>
  36 <p class="p3"><span class="Apple-tab-span">     </span></p>
  37 <p class="p4">// Running Average over x samples<span class="Apple-tab-span">    </span></p>
  38 <p class="p5">(</p>
  39 <p class="p5">{<span class="Apple-converted-space"> </span></p>
  40 <p class="p5"><span class="s2"><span class="Apple-tab-span">    </span>var</span> x = 100;</p>
  41 <p class="p5"><span class="Apple-tab-span">     </span><span class="s2">RunningSum</span>.ar(<span class="s2">LFSaw</span>.ar, x) * (x.reciprocal)</p>
  42 <p class="p5"><span class="Apple-converted-space"> </span>}.play</p>
  43 <p class="p5">)</p>
  44 <p class="p3"><br></p>
  45 <p class="p4">// RMS Power</p>
  46 <p class="p5">(</p>
  47 <p class="p5">{<span class="Apple-converted-space"> </span></p>
  48 <p class="p5"><span class="s2"><span class="Apple-tab-span">    </span>var</span> input, numsamp;</p>
  49 <p class="p3"><span class="Apple-tab-span">     </span></p>
  50 <p class="p5"><span class="Apple-tab-span">     </span>input = <span class="s2">LFSaw</span>.ar;</p>
  51 <p class="p5"><span class="Apple-tab-span">     </span>numsamp = 30;</p>
  52 <p class="p3"><span class="Apple-tab-span">     </span></p>
  53 <p class="p5"><span class="Apple-tab-span">     </span>(<span class="s2">RunningSum</span>.ar(input.squared, numsamp) / numsamp).sqrt</p>
  54 <p class="p5">}.play</p>
  55 <p class="p5">)</p>
  56 <p class="p3"><br></p>
  57 <p class="p3"><br></p>
  58 <p class="p4">// shortcut in class</p>
  59 <p class="p5">{ <span class="s2">RunningSum</span>.rms(<span class="s2">SoundIn</span>.ar) }.play<span class="Apple-tab-span">  </span><span class="Apple-tab-span">    </span></p>
  60 <p class="p3"><br></p>
  61 <p class="p3"><br></p>
  62 <p class="p4">// play around</p>
  63 <p class="p5">(</p>
  64 <p class="p5">{<span class="Apple-converted-space"> </span></p>
  65 <p class="p5"><span class="s2"><span class="Apple-tab-span">    </span>var</span> input, numsamp, power;</p>
  66 <p class="p5"><span class="Apple-tab-span">     </span>numsamp = 500;</p>
  67 <p class="p5"><span class="Apple-tab-span">     </span>input = <span class="s2">SoundIn</span>.ar;</p>
  68 <p class="p5"><span class="Apple-tab-span">     </span>power = <span class="s2">MouseX</span>.kr(0.1, 4);</p>
  69 <p class="p3"><br></p>
  70 <p class="p5"><span class="Apple-tab-span">     </span>(<span class="s2">RunningSum</span>.ar(input ** power, numsamp)/numsamp) ** (power.reciprocal)</p>
  71 <p class="p5">}.play</p>
  72 <p class="p5">)</p>
  73 <p class="p3"><br></p>
  74 <p class="p3"><br></p>
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