Help/UGens/FFT/PV_Mul.html

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  28 <p class="p1"><span class="s1"><b>PV_Mul<span class="Apple-tab-span">   </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>complex multiply</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><b>PV_Mul(bufferA,<span class="Apple-converted-space">  </span>bufferB)</b></p>
  31 <p class="p2"><br></p>
  32 <p class="p3">Complex Multiplication: (RealA * RealB) - (ImagA * ImagB), (ImagA * RealB) + (RealA * ImagB)</p>
  33 <p class="p3"><b>bufferA</b> - fft buffer A.</p>
  34 <p class="p3"><b>bufferB</b> - fft buffer B.</p>
  35 <p class="p2"><br></p>
  36 <p class="p4"><span class="s2">See also <a href="FFT Overview.html"><span class="s3">FFT Overview</span></a>.</span></p>
  37 <p class="p2"><br></p>
  38 <p class="p5"><br></p>
  39 <p class="p5"><br></p>
  40 <p class="p6">(</p>
  41 <p class="p6">{</p>
  42 <p class="p6"><span class="Apple-tab-span">     </span><span class="s4">var</span> inA, chainA, inB, chainB, chain ;</p>
  43 <p class="p6"><span class="Apple-tab-span">     </span>inA = <span class="s4">Saw</span>.ar(<span class="s4">LFNoise1</span>.kr(2).exprange(10, 1000));</p>
  44 <p class="p6"><span class="Apple-tab-span">     </span>inB =<span class="Apple-converted-space">  </span><span class="s4">Pulse</span>.ar(<span class="s4">LFNoise1</span>.kr(2).exprange(10, 1000));</p>
  45 <p class="p6"><span class="Apple-tab-span">     </span>chainA = <span class="s4">FFT</span>(<span class="s4">LocalBuf</span>(2048), inA);</p>
  46 <p class="p6"><span class="Apple-tab-span">     </span>chainB = <span class="s4">FFT</span>(<span class="s4">LocalBuf</span>(2048), inB);</p>
  47 <p class="p6"><span class="Apple-tab-span">     </span>chain = <span class="s4">PV_Mul</span>(chainA, chainB);<span class="Apple-converted-space"> </span></p>
  48 <p class="p6"><span class="Apple-tab-span">     </span>0.03 * <span class="s4">IFFT</span>(chain).dup;</p>
  49 <p class="p6">}.play</p>
  50 <p class="p6">);</p>
  51 <p class="p5"><br></p>
  52 <p class="p5"><br></p>
  53 <p class="p7">// stereo version:</p>
  54 <p class="p5"><br></p>
  55 <p class="p6">(</p>
  56 <p class="p6">{</p>
  57 <p class="p6"><span class="Apple-tab-span">     </span><span class="s4">var</span> inA, chainA, inB, chainB, chain ;</p>
  58 <p class="p6"><span class="Apple-tab-span">     </span>inA = <span class="s4">Saw</span>.ar(<span class="s4">LFNoise1</span>.kr(2).exprange(10, 1000)); <span class="s5">// same saw through different pulses</span></p>
  59 <p class="p6"><span class="Apple-tab-span">     </span>inB =<span class="Apple-converted-space">  </span><span class="s4">Pulse</span>.ar(<span class="s4">LFNoise1</span>.kr(2.dup).exprange(10, 1000));</p>
  60 <p class="p6"><span class="Apple-tab-span">     </span>chainA = <span class="s4">FFT</span>(<span class="s4">LocalBuf</span>(2048.dup), inA);</p>
  61 <p class="p6"><span class="Apple-tab-span">     </span>chainB = <span class="s4">FFT</span>(<span class="s4">LocalBuf</span>(2048.dup), inB);</p>
  62 <p class="p6"><span class="Apple-tab-span">     </span>chain = <span class="s4">PV_Mul</span>(chainA, chainB);<span class="Apple-converted-space"> </span></p>
  63 <p class="p6"><span class="Apple-tab-span">     </span>0.03 * <span class="s4">IFFT</span>(chain);</p>
  64 <p class="p6">}.play</p>
  65 <p class="p6">);</p>
  66 <p class="p5"><br></p>
  67 <p class="p5"><br></p>
  68 <p class="p5"><br></p>
  69 <p class="p6">(</p>
  70 <p class="p6"><span class="s6">SynthDef</span>(<span class="s7">"help-mul"</span>, { <span class="s6">arg</span> out=0;</p>
  71 <p class="p6"><span class="Apple-tab-span">     </span><span class="s6">var</span> inA, chainA, inB, chainB, chain ;</p>
  72 <p class="p6"><span class="Apple-tab-span">     </span>inA = <span class="s6">SinOsc</span>.ar(500, 0, 0.5);</p>
  73 <p class="p6"><span class="Apple-tab-span">     </span>inB =<span class="Apple-converted-space">  </span><span class="s6">SinOsc</span>.ar(<span class="s6">Line</span>.kr(100, 400, 5), 0, 0.5);</p>
  74 <p class="p6"><span class="Apple-tab-span">     </span>chainA = <span class="s6">FFT</span>(<span class="s4">LocalBuf</span>(2048), inA);</p>
  75 <p class="p6"><span class="Apple-tab-span">     </span>chainB = <span class="s6">FFT</span>(<span class="s4">LocalBuf</span>(2048), inB);</p>
  76 <p class="p6"><span class="Apple-tab-span">     </span>chain = <span class="s6">PV_Mul</span>(chainA, chainB);<span class="Apple-converted-space"> </span></p>
  77 <p class="p6"><span class="Apple-tab-span">     </span><span class="s6">Out</span>.ar(out,<span class="Apple-converted-space">  </span>0.5 * <span class="s6">IFFT</span>(chain).dup);</p>
  78 <p class="p6">}).play;</p>
  79 <p class="p6">)</p>
  80 <p class="p5"><br></p>
  81 <p class="p6">(</p>
  82 <p class="p6"><span class="s6">SynthDef</span>(<span class="s7">"help-mul2"</span>, { <span class="s6">arg</span> out=0;</p>
  83 <p class="p6"><span class="Apple-tab-span">     </span><span class="s6">var</span> inA, chainA, inB, chainB, chain ;</p>
  84 <p class="p6"><span class="Apple-tab-span">     </span>inA = <span class="s6">SinOsc</span>.ar(500, 0, 0.5) * <span class="s6">Line</span>.kr;</p>
  85 <p class="p6"><span class="Apple-tab-span">     </span>inB = <span class="s6">LFNoise1</span>.ar(20);</p>
  86 <p class="p6"><span class="Apple-tab-span">     </span>chainA = <span class="s6">FFT</span>(<span class="s4">LocalBuf</span>(2048), inA);</p>
  87 <p class="p6"><span class="Apple-tab-span">     </span>chainB = <span class="s6">FFT</span>(<span class="s4">LocalBuf</span>(2048), inB);</p>
  88 <p class="p6"><span class="Apple-tab-span">     </span>chain = <span class="s6">PV_Mul</span>(chainA, chainB);<span class="Apple-converted-space"> </span></p>
  89 <p class="p6"><span class="Apple-tab-span">     </span><span class="s6">Out</span>.ar(out,<span class="Apple-converted-space">  </span>0.5 * <span class="s6">IFFT</span>(chain).dup);</p>
  90 <p class="p6">}).play;</p>
  91 <p class="p6">)</p>
  92 <p class="p5"><br></p>
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