Help/UGens/Synth control/IndexInBetween.html

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  23 <p class="p1"><b>IndexInBetween<span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></b></p>
  24 <p class="p2"><br></p>
  25 <p class="p3"><b>IndexInBetween.ar(bufnum, in, mul, add)</b></p>
  26 <p class="p3"><b>IndexInBetween.kr(bufnum, in, mul, add)</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p3">Finds the (lowest) point in the <a href="../../ServerArchitecture/Buffer.html"><span class="s1">Buffer</span></a> at which the input signal lies in-between the two values, and returns the index. The fractional part of the index is suitable for linearly interpolating between the buffer slot values.<span class="Apple-converted-space"> </span></p>
  29 <p class="p2"><br></p>
  30 <p class="p3">For example, if the Buffer contains [3, 21, 25, 26] and the input has the value 22, then the output will be 1.25, because the value 22 is in-between the values stored in indices 1 and 2 and in fact is one-quarter of the way along the interval between them.</p>
  31 <p class="p2"><br></p>
  32 <p class="p3">IndexInBetween is the complement of <a href="IndexL.html"><span class="s1">IndexL</span></a>.</p>
  33 <p class="p2"><br></p>
  34 <p class="p3"><b>bufnum</b> - index of the buffer</p>
  35 <p class="p3"><b>in</b> - the input signal.</p>
  36 <p class="p4"><br></p>
  37 <p class="p4"><br></p>
  38 <p class="p5"><br></p>
  39 <p class="p6">(</p>
  40 <p class="p7">// autotune.</p>
  41 <p class="p6">s = <span class="s2">Server</span>.local;</p>
  42 <p class="p6">t = ([0, 1, 3, 4, 7, 11, 12] + 70).midicps;</p>
  43 <p class="p6">b = <span class="s2">Buffer</span>(s, t.size, 1);</p>
  44 <p class="p5"><br></p>
  45 <p class="p7">// alloc and set the values</p>
  46 <p class="p6">s.listSendMsg( b.allocMsg( b.setnMsg(0, t) ).postln );</p>
  47 <p class="p5"><br></p>
  48 <p class="p6">{</p>
  49 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> index, in, out, f0, fdiff;</p>
  50 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> bufnum = b;</p>
  51 <p class="p6"><span class="Apple-tab-span">     </span>in = <span class="s2">Pulse</span>.ar(<span class="s2">MouseX</span>.kr(t.minItem, t.maxItem)) * 0.1;</p>
  52 <p class="p6"><span class="Apple-tab-span">     </span>f0 = <span class="s2">Pitch</span>.kr(in).at(0);</p>
  53 <p class="p6"><span class="Apple-tab-span">     </span>index = <span class="s2">IndexInBetween</span>.kr(bufnum, f0);</p>
  54 <p class="p6"><span class="Apple-tab-span">     </span>fdiff = index.frac * (<span class="s2">Index</span>.kr(bufnum, index + 1) - <span class="s2">Index</span>.kr(bufnum, index));</p>
  55 <p class="p6"><span class="Apple-tab-span">     </span>out = <span class="s2">PitchShift</span>.ar(in, 0.1, 1 - (fdiff / f0), 0.01, 0.01);</p>
  56 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">RLPF</span>.ar(out, [2000, 5000], 0.3)</p>
  57 <p class="p6">}.play;</p>
  58 <p class="p6">)</p>
  59 <p class="p5"><br></p>
  60 <p class="p6">b.free;</p>
  61 <p class="p5"><br></p>
  62 <p class="p5"><br></p>
  63 <p class="p7">// basic test.</p>
  64 <p class="p6">(</p>
  65 <p class="p5"><br></p>
  66 <p class="p6">s = <span class="s2">Server</span>.local;</p>
  67 <p class="p6">t = [ 200, 210, 400, 430, 600, 800 ];</p>
  68 <p class="p6">b = <span class="s2">Buffer</span>(s, t.size, 1);</p>
  69 <p class="p5"><br></p>
  70 <p class="p7">// alloc and set the values</p>
  71 <p class="p6">s.listSendMsg( b.allocMsg( b.setnMsg(0, t) ).postln );</p>
  72 <p class="p5"><br></p>
  73 <p class="p5"><br></p>
  74 <p class="p6">{</p>
  75 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> index, f0, f1, f3;</p>
  76 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> bufnum = b;</p>
  77 <p class="p6"><span class="Apple-tab-span">     </span>f0 = <span class="s2">MouseX</span>.kr(200, 900);</p>
  78 <p class="p6"><span class="Apple-tab-span">     </span>index = <span class="s2">IndexInBetween</span>.kr(bufnum, f0);</p>
  79 <p class="p6"><span class="Apple-tab-span">     </span>f1 = <span class="s2">IndexL</span>.kr(bufnum, index);</p>
  80 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">SinOsc</span>.ar([f0, f1]) * 0.1</p>
  81 <p class="p5"><span class="Apple-tab-span">     </span></p>
  82 <p class="p6">}.play;</p>
  83 <p class="p6">)</p>
  84 <p class="p5"><br></p>
  85 <p class="p6">b.free;</p>
  86 <p class="p5"><br></p>
  87 <p class="p5"><br></p>
  88 <p class="p7">// One way to map across from an arbitrary piecewise curve, onto another:</p>
  89 <p class="p7">// We use IndexInBetween to "unmap" your input into integer slots,<span class="Apple-converted-space"> </span></p>
  90 <p class="p7">// and then use IndexL to do the reverse, to "map" onto your other distribution.<span class="Apple-converted-space"> </span></p>
  91 <p class="p7">// This example maps a sort-of-exponential curve onto a sort-of-sinusoidal curve:</p>
  92 <p class="p5"><br></p>
  93 <p class="p6">~from = [1, 2, 4, 8, 16];</p>
  94 <p class="p6">~to <span class="Apple-converted-space">  </span>= [0, 1,<span class="Apple-converted-space">  </span>0,<span class="Apple-converted-space">  </span>-1,<span class="Apple-converted-space">    </span>0];</p>
  95 <p class="p6">(</p>
  96 <p class="p6">x={</p>
  97 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">IndexL</span>.kr(~to.as(<span class="s2">LocalBuf</span>), <span class="s2">IndexInBetween</span>.kr(~from.as(<span class="s2">LocalBuf</span>),<span class="s2">MouseX</span>.kr(~from.first,~from.last).poll).poll).poll</p>
  98 <p class="p6">}.play</p>
  99 <p class="p6">)</p>
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