Help/UGens/FFT/PV_Conj.html

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  28 <p class="p1"><b>PV_Conj<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>complex conjugate</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><span class="s1"><b>Inherits from: </b><a href="../../Core/Object.html"><b>Object</b></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="../PV_ChainUGen.html"><b>PV_ChainUGen</b></a><b> : </b><a href="PV_MagSquared.html"><b>PV_MagSquared</b></a></p>
  31 <p class="p2"><br></p>
  32 <p class="p4"><b>PV_Conj.new(chain)</b></p>
  33 <p class="p2"><br></p>
  34 <p class="p4">Converts the FFT frames to their complex conjugate (i.e. reverses the sign of their imaginary part). This is not usually a useful audio effect in itself, but may be a component of other analysis or transformation processes...</p>
  35 <p class="p2"><br></p>
  36 <p class="p4"><b>chain</b> - fft chain.</p>
  37 <p class="p2"><br></p>
  38 <p class="p5"><span class="s1">See also: <a href="FFT Overview.html"><span class="s2">FFT Overview</span></a></span></p>
  39 <p class="p2"><br></p>
  40 <p class="p6">s.boot;</p>
  41 <p class="p7"><br></p>
  42 <p class="p6">(</p>
  43 <p class="p6">b = <span class="s3">Buffer</span>.alloc(s,2048,1);</p>
  44 <p class="p6">c = <span class="s3">Buffer</span>.read(s,"sounds/a11wlk01.wav");</p>
  45 <p class="p6">d = <span class="s3">Buffer</span>.alloc(s,2048,1);</p>
  46 <p class="p6">)</p>
  47 <p class="p7"><br></p>
  48 <p class="p6">(</p>
  49 <p class="p8"><span class="s4">SynthDef</span>(<span class="s5">\help_pvconj</span>, {<span class="Apple-converted-space">  </span><span class="s4">arg</span> out=0, bufnum=0, soundBufnum=2;</p>
  50 <p class="p8"><span class="Apple-tab-span">     </span><span class="s4">var</span> in, chain;</p>
  51 <p class="p8"><span class="Apple-tab-span">     </span>in = <span class="s4">PlayBuf</span>.ar(1, soundBufnum, <span class="s4">BufRateScale</span>.kr(soundBufnum), loop: 1);</p>
  52 <p class="p8"><span class="Apple-tab-span">     </span>chain = <span class="s4">FFT</span>(bufnum, in);</p>
  53 <p class="p8"><span class="Apple-tab-span">     </span>chain = <span class="s4">PV_Conj</span>(chain);</p>
  54 <p class="p9"><span class="s1"><span class="Apple-tab-span">    </span></span>// Original is left, conj is right</p>
  55 <p class="p8"><span class="Apple-tab-span">     </span><span class="s4">Out</span>.ar(out, 0.3 * [in, <span class="s4">IFFT</span>(chain)]);<span class="Apple-converted-space"> </span></p>
  56 <p class="p8">}).play(s,[<span class="s5">\out</span>, 0, <span class="s5">\bufnum</span>, b, <span class="s5">\soundBufnum</span>, c]);</p>
  57 <p class="p6">)</p>
  58 <p class="p7"><br></p>
  59 <p class="p6">(</p>
  60 <p class="p8"><span class="s4">SynthDef</span>(<span class="s5">\help_pvconj2</span>, {<span class="Apple-converted-space">  </span><span class="s4">arg</span> out=0, bufnum=0, soundBufnum=2;</p>
  61 <p class="p8"><span class="Apple-tab-span">     </span><span class="s4">var</span> in, chainA, chainB;</p>
  62 <p class="p8"><span class="Apple-tab-span">     </span>in = <span class="s4">PlayBuf</span>.ar(1, soundBufnum, <span class="s4">BufRateScale</span>.kr(soundBufnum), loop: 1);</p>
  63 <p class="p8"><span class="Apple-tab-span">     </span>chainA = <span class="s4">FFT</span>(bufnum, in);</p>
  64 <p class="p8"><span class="Apple-tab-span">     </span>chainB = <span class="s4">PV_Copy</span>(chainA, d);</p>
  65 <p class="p8"><span class="Apple-tab-span">     </span>chainB = <span class="s4">PV_Conj</span>(chainB);</p>
  66 <p class="p9"><span class="s1"><span class="Apple-tab-span">    </span></span>// Now we have the original and conjugate, what happens if we add them?</p>
  67 <p class="p8"><span class="Apple-tab-span">     </span><span class="s4">Out</span>.ar(out, 0.3 * (<span class="s4">IFFT</span>(<span class="s4">PV_Add</span>(chainA, chainB)).dup));<span class="Apple-converted-space"> </span></p>
  68 <p class="p8">}).play(s,[<span class="s5">\out</span>, 0, <span class="s5">\bufnum</span>, b, <span class="s5">\soundBufnum</span>, c]);</p>
  69 <p class="p6">)</p>
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