Help/UGens/Delays/BufCombL.html

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  23 <p class="p1"><b>BufCombL buffer based comb delay line with linear interpolation</b></p>
  24 <p class="p2"><br></p>
  25 <p class="p3"><b>BufCombL.ar(buf, in, delaytime, decaytime, mul, add)</b></p>
  26 <p class="p3"><b>BufCombL.kr(buf, in, delaytime, decaytime, mul, add)</b></p>
  27 <p class="p4"><br></p>
  28 <p class="p3">Comb delay line with linear interpolation which uses a buffer for its internal memory. See also <a href="BufCombN.html"><span class="s1">BufCombN</span></a> which uses no interpolation, and <a href="BufCombC.html"><span class="s1">BufCombC</span></a> which uses cubic interpolation. Cubic interpolation is more computationally expensive than linear, but more accurate.</p>
  29 <p class="p4"><br></p>
  30 <p class="p3">See also <a href="CombL.html"><span class="s1">CombL</span></a>.</p>
  31 <p class="p4"><br></p>
  32 <p class="p3"><b>buf</b> - buffer number.</p>
  33 <p class="p3"><b>in</b> - the input signal.</p>
  34 <p class="p3"><b>delaytime</b> - delay time in seconds.</p>
  35 <p class="p3"><b>decaytime</b> - time for the echoes to decay by 60 decibels. If this time is negative then the feedback</p>
  36 <p class="p3">coefficient will be negative, thus emphasizing only odd harmonics at an octave lower.</p>
  37 <p class="p3"><b>Warning:</b> For reasons of efficiency, the effective
  38 buffer size is limited to the previous power of two. So, if 44100
  39 samples are allocated, the maximum delay would be 32768 samples.</p>
  40 <p class="p5"><br></p>
  41 <p class="p6">// These examples compare the variants, so that you can hear the difference in interpolation</p>
  42 <p class="p7"><br></p>
  43 <p class="p6">// allocate buffer</p>
  44 <p class="p8">b = <span class="s2">Buffer</span>.alloc(s,44100,1);</p>
  45 <p class="p7"><br></p>
  46 <p class="p6">// Comb used as a resonator. The resonant fundamental is equal to<span class="Apple-converted-space"> </span></p>
  47 <p class="p6">// reciprocal of the delay time.</p>
  48 <p class="p8">{ <span class="s2">BufCombN</span>.ar(b, <span class="s2">WhiteNoise</span>.ar(0.01), <span class="s2">XLine</span>.kr(0.0001, 0.01, 20), 0.2) }.play;</p>
  49 <p class="p7"><br></p>
  50 <p class="p8">{ <span class="s2">BufCombL</span>.ar(b, <span class="s2">WhiteNoise</span>.ar(0.01), <span class="s2">XLine</span>.kr(0.0001, 0.01, 20), 0.2) }.play;</p>
  51 <p class="p7"><br></p>
  52 <p class="p8">{ <span class="s2">BufCombC</span>.ar(b, <span class="s2">WhiteNoise</span>.ar(0.01), <span class="s2">XLine</span>.kr(0.0001, 0.01, 20), 0.2) }.play;</p>
  53 <p class="p7"><br></p>
  54 <p class="p6">// with negative feedback:</p>
  55 <p class="p8">{ <span class="s2">BufCombN</span>.ar(b, <span class="s2">WhiteNoise</span>.ar(0.01), <span class="s2">XLine</span>.kr(0.0001, 0.01, 20), -0.2) }.play;</p>
  56 <p class="p7"><br></p>
  57 <p class="p8">{ <span class="s2">BufCombL</span>.ar(b, <span class="s2">WhiteNoise</span>.ar(0.01), <span class="s2">XLine</span>.kr(0.0001, 0.01, 20), -0.2) }.play;</p>
  58 <p class="p7"><br></p>
  59 <p class="p8">{ <span class="s2">BufCombC</span>.ar(b, <span class="s2">WhiteNoise</span>.ar(0.01), <span class="s2">XLine</span>.kr(0.0001, 0.01, 20), -0.2) }.play;</p>
  60 <p class="p7"><br></p>
  61 <p class="p6">// used as an echo.<span class="Apple-converted-space"> </span></p>
  62 <p class="p8">{ <span class="s2">BufCombL</span>.ar(b, <span class="s2">Decay</span>.ar(<span class="s2">Dust</span>.ar(1,0.5), 0.2, <span class="s2">WhiteNoise</span>.ar), 0.2, 3) }.play;</p>
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