Help/UGens/FFT/pvcalc2.html

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  24 <p class="p1"><b>pvcalc2<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span>Process the bins of two FFT chains</b></p>
  25 <p class="p2"><br></p>
  26 <p class="p3"><b><span class="Apple-tab-span">  </span>chain = chain.pvcalc2(chain2, numframes, func, frombin, tobin, zeroothers)</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p3">pvcalc2 is just like <a href="pvcalc.html"><span class="s1">pvcalc</span></a> but can combine two FFT chains together. See <a href="pvcalc.html"><span class="s1">pvcalc</span></a> for more information.</p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><b>func</b> should be a function that takes four arrays as inputs (magnitudes1, phases1, magnitudes2, phases2) and returns a resulting pair of arrays [magnitude, phase].</p>
  31 <p class="p2"><br></p>
  32 <p class="p2"><br></p>
  33 <p class="p3"><b>Example</b></p>
  34 <p class="p2"><br></p>
  35 <p class="p4">(</p>
  36 <p class="p4">s.boot.doWhenBooted {</p>
  37 <p class="p5"><span class="s2">c = </span><span class="s3">Buffer</span><span class="s2">.read(s,</span>"sounds/a11wlk01.wav"<span class="s2">);</span></p>
  38 <p class="p4">}</p>
  39 <p class="p4">)</p>
  40 <p class="p6"><br></p>
  41 <p class="p4">(</p>
  42 <p class="p4">x = {</p>
  43 <p class="p4"><span class="Apple-tab-span">     </span><span class="s4">var</span> fftsize = 1024;</p>
  44 <p class="p4"><span class="Apple-tab-span">     </span><span class="s4">var</span> in, chain, in2, chain2, out;</p>
  45 <p class="p4"><span class="Apple-tab-span">     </span>in = <span class="s4">PlayBuf</span>.ar(1, c, <span class="s4">BufRateScale</span>.kr(c), loop: 1);</p>
  46 <p class="p4"><span class="Apple-tab-span">     </span>chain = <span class="s4">FFT</span>(<span class="s4">LocalBuf</span>(fftsize), in);</p>
  47 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  48 <p class="p4"><span class="Apple-tab-span">     </span>// in2 = <span class="s4">PlayBuf</span>.ar(1, e, <span class="s4">BufRateScale</span>.kr(e), loop: 1);</p>
  49 <p class="p4"><span class="Apple-tab-span">     </span>// JMcC babbling brook</p>
  50 <p class="p4"><span class="Apple-tab-span">     </span>in2 = ({</p>
  51 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">RHPF</span>.ar(<span class="s4">OnePole</span>.ar(<span class="s4">BrownNoise</span>.ar, 0.99), <span class="s4">LPF</span>.ar(<span class="s4">BrownNoise</span>.ar, 14)</p>
  52 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>* 400 + 500, 0.03, 0.003)}!2)</p>
  53 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>+ ({<span class="s4">RHPF</span>.ar(<span class="s4">OnePole</span>.ar(<span class="s4">BrownNoise</span>.ar, 0.99), <span class="s4">LPF</span>.ar(<span class="s4">BrownNoise</span>.ar, 20)</p>
  54 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>* 800 + 1000, 0.03, 0.005)}!2</p>
  55 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>)</p>
  56 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>* 4;</p>
  57 <p class="p4"><span class="Apple-tab-span">     </span>chain2 = <span class="s4">FFT</span>(<span class="s4">LocalBuf</span>(fftsize), in2);</p>
  58 <p class="p6"><span class="Apple-tab-span">     </span></p>
  59 <p class="p4"><span class="Apple-tab-span">     </span>chain = chain.pvcalc2(chain2, fftsize, {<span class="s4">|mags, phases, mags2, phases2|</span></p>
  60 <p class="p4"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>[mags * mags2 / 10, phases2 + phases]</p>
  61 <p class="p4"><span class="Apple-tab-span">     </span>}, frombin: 0, tobin: 125, zeroothers: 0);</p>
  62 <p class="p6"><span class="Apple-tab-span">     </span></p>
  63 <p class="p4"><span class="Apple-tab-span">     </span>out = <span class="s4">IFFT</span>(chain);</p>
  64 <p class="p4"><span class="Apple-tab-span">     </span><span class="s4">Out</span>.ar(0, 0.5 * out.dup);</p>
  65 <p class="p4">}.play(s);</p>
  66 <p class="p4">)</p>
  67 <p class="p4">x.free;</p>
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