Help/UGens/Filters/BEQSuite/BLowShelf.html

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  28 <p class="p1"><span class="s1"><b>BLowShelf<span class="Apple-tab-span">        </span></b></span><b><span class="Apple-tab-span">      </span>Low Shelf.</b></p>
  29 <p class="p2"><br></p>
  30 <p class="p3"><b>BLowShelf.ar(in, freq, rs, db, 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> - center frequency.</p>
  34 <p class="p3"><b>rs</b> - the reciprocal of S.<span class="Apple-converted-space">  </span>Shell boost/cut slope. When S = 1, the shelf slope is as steep as it can be and remain monotonically increasing or decreasing gain with frequency.<span class="Apple-converted-space">  </span>The shelf slope, in<span class="Apple-converted-space">  </span>dB/octave, remains proportional to S for all other values for a fixed <b>freq/SampleRate.ir</b> and <b>db</b>.</p>
  35 <p class="p3"><b>db </b>- gain. boost/cut the center frequency in dBs.</p>
  36 <p class="p2"><br></p>
  37 <p class="p3">The B equalization suite is based on the Second Order Section (<b>SOS</b>) biquad UGen.</p>
  38 <p class="p4"><br></p>
  39 <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>
  40 <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>
  41 <p class="p4"><br></p>
  42 <p class="p3">see also:<span class="s2"> </span><b>SOS, BLowPass, BLowPass4, BHiPass, BHiPass4, BPeakEQ, BHiShelf, BBandPass, BBandStop, BAllPass.</b></p>
  43 <p class="p2"><br></p>
  44 <p class="p5">s.boot;</p>
  45 <p class="p5">(</p>
  46 <p class="p6"><span class="s3">z = { </span>// toy around with boost/cut</p>
  47 <p class="p7">BLowShelf<span class="s3">.ar(</span></p>
  48 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">SoundIn</span>.ar([0,1]),</p>
  49 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">MouseX</span>.kr(40,6000,<span class="s5">\exponential</span>),</p>
  50 <p class="p5"><span class="Apple-tab-span">     </span>1.0,<span class="Apple-converted-space">  </span><span class="s6">// rs</span></p>
  51 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">MouseY</span>.kr(24.0, -24.0, <span class="s5">\linear</span>),</p>
  52 <p class="p5"><span class="Apple-tab-span">     </span>0.5); <span class="s6">// mul</span></p>
  53 <p class="p5">}.play)</p>
  54 <p class="p5">z.release;</p>
  55 <p class="p8"><br></p>
  56 <p class="p5">(</p>
  57 <p class="p6"><span class="s3">z = { </span>// toy around with rs</p>
  58 <p class="p7">BLowShelf<span class="s3">.ar(</span></p>
  59 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">SoundIn</span>.ar([0,1]),</p>
  60 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">MouseX</span>.kr(20,6000,<span class="s5">\exponential</span>),</p>
  61 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">MouseY</span>.kr(0.1, 1.0, <span class="s5">\linear</span>),<span class="Apple-converted-space">  </span><span class="s6">// rs</span></p>
  62 <p class="p5"><span class="Apple-tab-span">     </span>6,</p>
  63 <p class="p5"><span class="Apple-tab-span">     </span>0.5); <span class="s6">// mul</span></p>
  64 <p class="p5">}.play)</p>
  65 <p class="p5">z.release;</p>
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