Help/UGens/FFT/PV_LocalMax.html

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  28 <p class="p1"><span class="s1"><b>PV_LocalMax<span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></span><b>pass bins which are a local maximum</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><span class="s2"><b>Inherits from: </b><a href="../../Core/Object.html"><b>Object</b></a></span><span class="s3"><b> : </b><a href="../../Core/Kernel/AbstractFunction.html"><span class="s4"><b>AbstractFunction</b></span></a><b> : </b><a href="../UGen.html"><span class="s4"><b>UGen</b></span></a><b> : </b><a href="../PV_ChainUGen.html"><span class="s4"><b>PV_ChainUGen</b></span></a><b><span class="Apple-converted-space"> </span></b></span></p>
  31 <p class="p2"><br></p>
  32 <p class="p1"><b>PV_LocalMax(buffer,<span class="Apple-converted-space">  </span>threshold)</b></p>
  33 <p class="p2"><br></p>
  34 <p class="p1">Passes only bins whose magnitude is above a threshold and above their nearest neighbors.</p>
  35 <p class="p1"><b>buffer</b> - fft buffer.</p>
  36 <p class="p1"><b>threshold</b> - magnitude threshold.</p>
  37 <p class="p2"><br></p>
  38 <p class="p3"><span class="s2">See also <a href="FFT Overview.html"><span class="s5">FFT Overview</span></a>.</span></p>
  39 <p class="p2"><br></p>
  40 <p class="p4">s.boot;</p>
  41 <p class="p5"><br></p>
  42 <p class="p5"><br></p>
  43 <p class="p4">(</p>
  44 <p class="p6"><span class="s6">SynthDef</span><span class="s2">(</span>"help-localMax"<span class="s2">, { </span><span class="s6">arg</span><span class="s2"> out=0;</span></p>
  45 <p class="p4"><span class="Apple-tab-span">     </span><span class="s6">var</span> in, chain;</p>
  46 <p class="p4"><span class="Apple-tab-span">     </span>in = <span class="s6">Mix</span>.arFill(3, { <span class="s6">LFSaw</span>.ar(exprand(100, 500), 0, 0.1); });</p>
  47 <p class="p4"><span class="Apple-tab-span">     </span>chain = <span class="s6">FFT</span>(<span class="s6">LocalBuf</span>(2048), in);</p>
  48 <p class="p4"><span class="Apple-tab-span">     </span>chain = <span class="s6">PV_LocalMax</span>(chain, <span class="s6">MouseX</span>.kr(0, 50));<span class="Apple-converted-space"> </span></p>
  49 <p class="p4"><span class="Apple-tab-span">     </span><span class="s6">Out</span>.ar(out, 0.5 * <span class="s6">IFFT</span>(chain).dup);</p>
  50 <p class="p4">}).play(s,[<span class="s7">\out</span>, 0]);</p>
  51 <p class="p4">)</p>
  52 <p class="p5"><br></p>
  53 <p class="p6"><span class="s2">d = </span><span class="s6">Buffer</span><span class="s2">.read(s,</span>"sounds/a11wlk01.wav"<span class="s2">);</span></p>
  54 <p class="p5"><br></p>
  55 <p class="p4">(</p>
  56 <p class="p4"><span class="s6">SynthDef</span>(<span class="s8">"help-localMax2"</span>, { <span class="s6">arg</span> out=0, soundBufnum=2;</p>
  57 <p class="p4"><span class="Apple-tab-span">     </span><span class="s6">var</span> in, chain;</p>
  58 <p class="p4"><span class="Apple-tab-span">     </span>in = <span class="s6">PlayBuf</span>.ar(1, soundBufnum, <span class="s6">BufRateScale</span>.kr(soundBufnum), loop: 1);</p>
  59 <p class="p4"><span class="Apple-tab-span">     </span>chain = <span class="s6">FFT</span>(<span class="s6">LocalBuf</span>(2048), in);</p>
  60 <p class="p4"><span class="Apple-tab-span">     </span>chain = <span class="s6">PV_LocalMax</span>(chain, <span class="s6">MouseX</span>.kr(0, 100));<span class="Apple-converted-space"> </span></p>
  61 <p class="p4"><span class="Apple-tab-span">     </span><span class="s6">Out</span>.ar(out, 0.5 * <span class="s6">IFFT</span>(chain).dup);</p>
  62 <p class="p4">}).play(s,[<span class="s7">\out</span>, 0, <span class="s7">\soundBufnum</span>, d]);</p>
  63 <p class="p4">)</p>
  64 <p class="p5"><br></p>
  65 <p class="p4">d.free;</p>
  66 <p class="p5"><br></p>
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