Help/UGens/Filters/BEQSuite/BLowPass4.html

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  28 <p class="p1"><span class="s1"><b>BLowPass4</b></span><b><span class="Apple-tab-span">  </span>24db/oct rolloff - 4th order resonant Low Pass Filter. [1]</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><b>BLowPass4.ar(in, freq, rq, mul, add)</b></p>
  31 <p class="p2"><br></p>
  32 <p class="p3"><b>in</b> - input signal to be processed</p>
  33 <p class="p3"><b>freq</b> - cutoff frequency.</p>
  34 <p class="p3"><b>rq</b> - the reciprocal of Q.<span class="Apple-converted-space">  </span>bandwidth / cutoffFreq.</p>
  35 <p class="p4"><br></p>
  36 <p class="p3">The B equalization suite is based on the Second Order Section (<b>SOS</b>) biquad UGen.</p>
  37 <p class="p4"><br></p>
  38 <p class="p3">note: Biquad coefficient calculations imply certain amount of CPU overhead. These plugin UGens contain optimizations such that the coefficients get updated only when there has been a change to one of</p>
  39 <p class="p3">the filter's parameters. This can cause spikes in CPU performance and should be considered when using several of these units.</p>
  40 <p class="p4"><br></p>
  41 <p class="p3">[1] this is a composite pseudo UGen. BLowPass4 is built by cascading 2 SOS sections.</p>
  42 <p class="p4"><br></p>
  43 <p class="p3">see also:<span class="s2"> </span><b>SOS, BLowPass, BHiPass, BHiPass4, BPeakEQ, BLowShelf, BHiShelf, BBandPass, BBandStop, BAllPass.</b></p>
  44 <p class="p5"><br></p>
  45 <p class="p6">s.boot;</p>
  46 <p class="p6">(</p>
  47 <p class="p6">z = {</p>
  48 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>BLowPass4<span class="s3">.ar(</span></p>
  49 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">SoundIn</span>.ar([0,1]),</p>
  50 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s4">MouseX</span>.kr(10,20000,<span class="s5">\exponential</span>), <span class="s6">// cutoff freq.</span></p>
  51 <p class="p8"><span class="s3"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span><span class="s4">MouseY</span><span class="s3">.kr(0.1, 1.0, </span><span class="s5">\linear</span><span class="s3">), </span>// rq - compensate for 2 biquad sections.</p>
  52 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>0.5); <span class="s6">// mul</span></p>
  53 <p class="p6">}.play)</p>
  54 <p class="p6">z.release;</p>
  55 <p class="p5"><br></p>
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