Help/UGens/Noise/MantissaMask.html

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  22 <p class="p1"><br></p>
  23 <p class="p2"><b>MantissaMask<span class="Apple-tab-span">      </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>reduce precision</b></p>
  24 <p class="p3"><br></p>
  25 <p class="p4"><b>MantissaMask.ar(in, bits, mul, add)</b></p>
  26 <p class="p3"><br></p>
  27 <p class="p4">Masks off bits in the mantissa of the floating point sample value. This introduces a quantization noise, but is less severe than linearly quantizing the signal.</p>
  28 <p class="p3"><br></p>
  29 <p class="p4"><b>in</b> - input signal</p>
  30 <p class="p4"><b>bits</b> - the number of mantissa bits to preserve. a number from 0 to 23.</p>
  31 <p class="p1"><br></p>
  32 <p class="p3"><br></p>
  33 <p class="p5">// preserve only 3 bits of mantissa.</p>
  34 <p class="p6">{ <span class="s1">MantissaMask</span>.ar(<span class="s1">SinOsc</span>.ar(<span class="s1">SinOsc</span>.kr(0.2,0,400,500), 0, 0.4), 3) }.play</p>
  35 <p class="p7"><br></p>
  36 <p class="p5">// the original</p>
  37 <p class="p6">{ <span class="s1">SinOsc</span>.ar(<span class="s1">SinOsc</span>.kr(0.2,0,400,500), 0, 0.4) }.play</p>
  38 <p class="p7"><br></p>
  39 <p class="p5">// the difference.</p>
  40 <p class="p6">(</p>
  41 <p class="p6">{<span class="Apple-converted-space"> </span></p>
  42 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">var</span> in;</p>
  43 <p class="p6"><span class="Apple-tab-span">     </span>in = <span class="s1">SinOsc</span>.ar(<span class="s1">SinOsc</span>.kr(0.2,0,400,500), 0, 0.4);</p>
  44 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">Out</span>.ar(0, in - <span class="s1">MantissaMask</span>.ar(in, 3));</p>
  45 <p class="p6">}.play</p>
  46 <p class="p6">)</p>
  47 <p class="p7"><br></p>
  48 <p class="p3"><br></p>
  49 <p class="p5">// preserve 7 bits of mantissa.<span class="Apple-converted-space"> </span></p>
  50 <p class="p5">// This makes the lower 16 bits of the floating point number become zero.</p>
  51 <p class="p6">{ <span class="s1">MantissaMask</span>.ar(<span class="s1">SinOsc</span>.ar(<span class="s1">SinOsc</span>.kr(0.2,0,400,500), 0, 0.4), 7) }.play</p>
  52 <p class="p7"><br></p>
  53 <p class="p5">// the original</p>
  54 <p class="p6">{ <span class="s1">SinOsc</span>.ar(<span class="s1">SinOsc</span>.kr(0.2,0,400,500), 0, 0.4) }.play</p>
  55 <p class="p7"><br></p>
  56 <p class="p5">// the difference.</p>
  57 <p class="p6">(</p>
  58 <p class="p6">{<span class="Apple-converted-space"> </span></p>
  59 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">var</span> in;</p>
  60 <p class="p6"><span class="Apple-tab-span">     </span>in = <span class="s1">SinOsc</span>.ar(<span class="s1">SinOsc</span>.kr(0.2,0,400,500), 0, 0.4);</p>
  61 <p class="p6"><span class="Apple-tab-span">     </span><span class="s1">Out</span>.ar(0, in - <span class="s1">MantissaMask</span>.ar(in, 7));</p>
  62 <p class="p6">}.play</p>
  63 <p class="p6">)</p>
  64 <p class="p3"><br></p>
  65 <p class="p7"><br></p>
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