Help/UGens/Oscillators/VOsc.html

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  27 <p class="p1"><b>VOsc<span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>variable wavetable oscillator</b></p>
  28 <p class="p2"><br></p>
  29 <p class="p3"><b>VOsc.ar(table, freq, phase, mul, add)</b></p>
  30 <p class="p4"><br></p>
  31 <p class="p3">A wavetable lookup oscillator which can be swept smoothly across wavetables. All the wavetables must be allocated to the same size. Fractional values of table will interpolate between two adjacent tables.</p>
  32 <p class="p4"><br></p>
  33 <p class="p3">This oscillator requires at least two buffers to be filled with a wavetable format signal.<span class="Apple-converted-space">  </span>This preprocesses the Signal into a form which can be used efficiently by the Oscillator.<span class="Apple-converted-space">  </span>The buffer size must be a power of 2.</p>
  34 <p class="p4"><br></p>
  35 <p class="p3">This can be acheived by creating a Buffer object and sending it one of the "b_gen" messages ( sine1, sine2, sine3 ) with the wavetable flag set to true. <span class="Apple-converted-space"> </span></p>
  36 <p class="p4"><br></p>
  37 <p class="p3">This can also be acheived by creating a Signal object and sending it the 'asWavetable' message, saving it to disk, and having the server load it from there.</p>
  38 <p class="p4"><br></p>
  39 <p class="p3">If you use Buffer objects to manage buffer numbers, you can use the *allocConsecutive method to allocate a continuous block of buffers. See the <a href="../../ServerArchitecture/Buffer.html"><span class="s1">Buffer</span></a> helpfile for details. Note that since VOsc uses fractional buffer numbers you will need to call <b>bufnum</b> on any Buffer objects which are used directly as UGen inputs.</p>
  40 <p class="p4"><br></p>
  41 <p class="p3"><b>table</b> - buffer index. Can be swept continuously among adjacent wavetable buffers of the same size.</p>
  42 <p class="p3"><b>freq</b> - frequency in Hertz</p>
  43 <p class="p3"><b>phase</b> - phase offset or modulator in radians</p>
  44 <p class="p4"><br></p>
  45 <p class="p3">note about wavetables:</p>
  46 <p class="p3">VOsc requires the b_gen sine1 wavetable flag to be ON.</p>
  47 <p class="p5"><br></p>
  48 <p class="p5"><br></p>
  49 <p class="p6">(</p>
  50 <p class="p6">s = <span class="s2">Server</span>.local;</p>
  51 <p class="p7">// allocate and fill tables 0 to 7</p>
  52 <p class="p6">8.do({ <span class="s2">arg</span> i;</p>
  53 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> n, a;</p>
  54 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// allocate table</p>
  55 <p class="p6"><span class="Apple-tab-span">     </span>s.sendMsg(<span class="s4">\b_alloc</span>, i, 1024);<span class="Apple-converted-space"> </span></p>
  56 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// generate array of harmonic amplitudes</p>
  57 <p class="p6"><span class="Apple-tab-span">     </span>n = (i+1)**2;</p>
  58 <p class="p6"><span class="Apple-tab-span">     </span>a = <span class="s2">Array</span>.fill(n, { <span class="s2">arg</span> j; ((n-j)/n).squared.round(0.001) });</p>
  59 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// fill table</p>
  60 <p class="p6"><span class="Apple-tab-span">     </span>s.performList(<span class="s4">\sendMsg</span>, <span class="s4">\b_gen</span>, i, <span class="s4">\sine1</span>, 7, a);</p>
  61 <p class="p6">});</p>
  62 <p class="p6">)</p>
  63 <p class="p5"><br></p>
  64 <p class="p6">(</p>
  65 <p class="p6"><span class="s2">SynthDef</span>(<span class="s5">"help-VOsc"</span>,{ <span class="s2">arg</span> out=0, bufoffset=0;</p>
  66 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> x;</p>
  67 <p class="p6"><span class="Apple-tab-span">     </span>// mouse x controls the wavetable position</p>
  68 <p class="p6"><span class="Apple-tab-span">     </span>x = <span class="s2">MouseX</span>.kr(0,7);</p>
  69 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">Out</span>.ar(out,</p>
  70 <p class="p6"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">VOsc</span>.ar(bufoffset+x, [120,121], 0, 0.3)</p>
  71 <p class="p6"><span class="Apple-tab-span">     </span>)</p>
  72 <p class="p6">}).play(s,[<span class="s4">\out</span>, 0, <span class="s4">\bufoffset</span>, 0]);</p>
  73 <p class="p6">)</p>
  74 <p class="p5"><br></p>
  75 <p class="p6">(</p>
  76 <p class="p6">8.do({ <span class="s2">arg</span> i;</p>
  77 <p class="p6"><span class="Apple-tab-span">     </span>var a;</p>
  78 <p class="p6"><span class="Apple-tab-span">     </span>s.sendMsg(<span class="s4">\b_alloc</span>, i, 1024); <span class="s6">// allocate table</span></p>
  79 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// generate array of harmonic amplitudes</p>
  80 <p class="p6"><span class="Apple-tab-span">     </span>a = <span class="s2">Array</span>.fill(i, 0) ++ [0.5, 1, 0.5];</p>
  81 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// fill table</p>
  82 <p class="p6"><span class="Apple-tab-span">     </span>s.performList(<span class="s4">\sendMsg</span>, <span class="s4">\b_gen</span>, i, <span class="s4">\sine1</span>, 7, a);</p>
  83 <p class="p6">});</p>
  84 <p class="p6">)</p>
  85 <p class="p5"><br></p>
  86 <p class="p6">(</p>
  87 <p class="p6">8.do({ <span class="s2">arg</span> i;</p>
  88 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> a;</p>
  89 <p class="p6"><span class="Apple-tab-span">     </span>s.sendMsg(<span class="s4">\b_alloc</span>, i, 1024); <span class="s6">// allocate table</span></p>
  90 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// generate array of harmonic amplitudes</p>
  91 <p class="p6"><span class="Apple-tab-span">     </span>a = <span class="s2">Array</span>.fill(32,0);</p>
  92 <p class="p6"><span class="Apple-tab-span">     </span>12.do({ <span class="s2">arg</span> i; a.put(32.rand, 1) });</p>
  93 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// fill table</p>
  94 <p class="p6"><span class="Apple-tab-span">     </span>s.performList(<span class="s4">\sendMsg</span>, <span class="s4">\b_gen</span>, i, <span class="s4">\sine1</span>, 7, a);</p>
  95 <p class="p6">});</p>
  96 <p class="p6">)</p>
  97 <p class="p5"><br></p>
  98 <p class="p6">(</p>
  99 <p class="p6">8.do({ <span class="s2">arg</span> i;</p>
 100 <p class="p6"><span class="Apple-tab-span">     </span><span class="s2">var</span> a;</p>
 101 <p class="p6"><span class="Apple-tab-span">     </span>s.sendMsg(<span class="s4">\b_alloc</span>, i, 1024); <span class="s6">// allocate table</span></p>
 102 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// generate array of harmonic amplitudes</p>
 103 <p class="p6"><span class="Apple-tab-span">     </span>n = (i+1)**2;</p>
 104 <p class="p6"><span class="Apple-tab-span">     </span>a = <span class="s2">Array</span>.fill(n, { <span class="s2">arg</span> j; 1.0.rand2 });</p>
 105 <p class="p7"><span class="s3"><span class="Apple-tab-span">    </span></span>// fill table</p>
 106 <p class="p6"><span class="Apple-tab-span">     </span>s.performList(<span class="s4">\sendMsg</span>, <span class="s4">\b_gen</span>, i, <span class="s4">\sine1</span>, 7, a);</p>
 107 <p class="p6">});</p>
 108 <p class="p6">)</p>
 109 <p class="p5"><br></p>
 110 <p class="p5"><br></p>
 111 <p class="p5"><br></p>
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