Help/UGens/FFT/FFTTrigger.html

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  21 <p class="p1"><span class="s1"><b>FFTTrigger<span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span></b></span><b>Outputs the necessary signal for FFT chains, without doing an FFT on a signal</b></p>
  22 <p class="p2"><br></p>
  23 <p class="p1"><b>FFTrigger(buffer, hop, polar)</b></p>
  24 <p class="p2"><br></p>
  25 <p class="p1"><span class="Apple-tab-span">     </span>buffer - a buffer to condition for FFT use</p>
  26 <p class="p1"><span class="Apple-tab-span">     </span>hop - the hop size for timing triggers (defaults to 0.5)</p>
  27 <p class="p1"><span class="Apple-tab-span">     </span>polar - a flag. If 0.0, the buffer will be prepared for complex data, if &gt; 0.0, polar data is set up.</p>
  28 <p class="p2"><span class="Apple-tab-span">     </span></p>
  29 <p class="p3">(</p>
  30 <p class="p3">s.boot.doWhenBooted{</p>
  31 <p class="p3"><span class="Apple-tab-span">     </span>b = <span class="s2">Buffer</span>.alloc(s, 512);</p>
  32 <p class="p3">};</p>
  33 <p class="p3">)</p>
  34 <p class="p4">// Reminder: This isn't the intended typical usage! It's OK to do this though.</p>
  35 <p class="p3">(</p>
  36 <p class="p3">x = {</p>
  37 <p class="p3"><span class="Apple-tab-span">     </span><span class="s2">var</span> mags, phases, chain, sig;</p>
  38 <p class="p4"><span class="s3"><span class="Apple-tab-span">    </span></span>// Create simple undulating magnitudes</p>
  39 <p class="p3"><span class="Apple-tab-span">     </span>mags = {<span class="s2">FSinOsc</span>.kr(<span class="s2">ExpRand</span>(0.1, 1)).range(0, 1)}.dup(100);</p>
  40 <p class="p4"><span class="s3"><span class="Apple-tab-span">    </span></span>// Then give them a "rolloff" to make the sound less unpleasant</p>
  41 <p class="p3"><span class="Apple-tab-span">     </span>mags = mags<span class="Apple-converted-space">  </span>* ((1, 0.99 .. 0.01).squared);</p>
  42 <p class="p4"><span class="s3"><span class="Apple-tab-span">    </span></span>// Let's turn the bins on and off at different rates, I'm *sure* that'll sound interesting</p>
  43 <p class="p3"><span class="Apple-tab-span">     </span>mags = mags * {<span class="s2">LFPulse</span>.kr(2 ** <span class="s2">IRand</span>(-3, 5)).range(0, 1)}.dup(100);</p>
  44 <p class="p4"><span class="s3"><span class="Apple-tab-span">    </span></span>// Let's ignore phase for now</p>
  45 <p class="p3"><span class="Apple-tab-span">     </span>phases = 0.dup(100);</p>
  46 <p class="p3"><span class="Apple-tab-span">     </span>chain = <span class="s2">FFTTrigger</span>(b, 0.5);</p>
  47 <p class="p4"><span class="s3"><span class="Apple-tab-span">    </span></span>// Now we can do the packing</p>
  48 <p class="p3"><span class="Apple-tab-span">     </span>chain = <span class="s2">PackFFT</span>(chain, 512, [mags, phases].flop.flatten, 0, 99, 1);</p>
  49 <p class="p3"><span class="Apple-tab-span">     </span>sig = <span class="s2">IFFT</span>(chain);</p>
  50 <p class="p3"><span class="Apple-tab-span">     </span><span class="s2">Out</span>.ar(0, sig.dup);</p>
  51 <p class="p3">}.play(s);</p>
  52 <p class="p3">)</p>
  53 <p class="p3">x.free;</p>
  54 <p class="p3">b.free;</p>
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