Help/UGens/Triggers/Phasor.html

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  26 <p class="p1"><span class="s1"><b>Phasor</b></span><span class="s2"><span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span><b>a resettable linear ramp between two levels</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p1"><b>superclass: UGen</b></p>
  29 <p class="p3"><br></p>
  30 <p class="p1">Phasor is a linear ramp between start and end values. When its trigger input crosses from non-positive to positive, Phasor's output will jump to its reset position. Upon reaching the end of its ramp Phasor will wrap back to its start. <b>N.B.</b> Since <b>end</b> is defined as the wrap point, its value is never actually output.</p>
  31 <p class="p3"><br></p>
  32 <p class="p1">Phasor is commonly used as an index control with <a href="../Oscillators/BufRd.html"><span class="s3">BufRd</span></a><b> </b>and<b> </b><a href="../Oscillators/BufWr.html"><span class="s3">BufWr</span></a>.</p>
  33 <p class="p3"><br></p>
  34 <p class="p3"><b><span class="Apple-tab-span">  </span></b></p>
  35 <p class="p1"><b><span class="Apple-tab-span">  </span>*ar(trig, rate, start, end, resetPos)</b></p>
  36 <p class="p1"><b><span class="Apple-tab-span">  </span>*kr(trig, rate, start, end, resetPos)</b></p>
  37 <p class="p3"><br></p>
  38 <p class="p1"><span class="s2"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span><b>trig</b></p>
  39 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>when triggered, reset value to resetPos (default: 0, Phasor outputs start initially)</p>
  40 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><b>rate</b></p>
  41 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>the amount of change per sample</p>
  42 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>i.e at a rate of 1 the value of each sample will be 1 greater than the preceding sample</p>
  43 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  44 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><b>start, end</b></p>
  45 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>start and end points of ramp.<span class="Apple-converted-space"> </span></p>
  46 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  47 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><b>resetPos</b></p>
  48 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>the value to jump to upon receiving a trigger.</p>
  49 <p class="p3"><br></p>
  50 <p class="p2"><br></p>
  51 <p class="p2"><span class="Apple-tab-span">     </span></p>
  52 <p class="p4">// phasor controls sine frequency: end frequency matches a second sine wave.</p>
  53 <p class="p2"><br></p>
  54 <p class="p5">(</p>
  55 <p class="p5">{ <span class="s4">var</span> trig, rate, x, sr;</p>
  56 <p class="p5"><span class="Apple-tab-span">     </span>rate = <span class="s4">MouseX</span>.kr(0.2, 2, 1);</p>
  57 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s4">Impulse</span>.ar(rate);</p>
  58 <p class="p5"><span class="Apple-tab-span">     </span>sr = <span class="s4">SampleRate</span>.ir;</p>
  59 <p class="p5"><span class="Apple-tab-span">     </span>x = <span class="s4">Phasor</span>.ar(trig, rate / sr);</p>
  60 <p class="p6"><span class="s5"><span class="Apple-tab-span">    </span></span>SinOsc<span class="s5">.ar(</span></p>
  61 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>[</p>
  62 <p class="p4"><span class="s5"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span></span><span class="s4">LinLin</span><span class="s5">.kr(x, 0, 1, 600, 1000), </span>// convert range from 0..1 to 600..1000</p>
  63 <p class="p4"><span class="s5"><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span>1000 </span>// constant second frequency</p>
  64 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>], 0, 0.2)</p>
  65 <p class="p2"><br></p>
  66 <p class="p5">}.play;</p>
  67 <p class="p5">)</p>
  68 <p class="p2"><br></p>
  69 <p class="p2"><br></p>
  70 <p class="p4">// two phasors control two sine frequencies: mouse y controls resetPos of the second</p>
  71 <p class="p5">(</p>
  72 <p class="p5">{ <span class="s4">var</span> trig, rate, x, sr;</p>
  73 <p class="p5"><span class="Apple-tab-span">     </span>rate = <span class="s4">MouseX</span>.kr(1, 200, 1);</p>
  74 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s4">Impulse</span>.ar(rate);</p>
  75 <p class="p5"><span class="Apple-tab-span">     </span>sr = <span class="s4">SampleRate</span>.ir;</p>
  76 <p class="p5"><span class="Apple-tab-span">     </span>x = <span class="s4">Phasor</span>.ar(trig, rate / sr, 0, 1, [0, <span class="s4">MouseY</span>.kr(0, 1)]);</p>
  77 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">SinOsc</span>.ar(x * 500 + 500, 0, 0.2)</p>
  78 <p class="p5">}.play;</p>
  79 <p class="p5">)</p>
  80 <p class="p2"><br></p>
  81 <p class="p2"><br></p>
  82 <p class="p4">// use phasor to index into a sound file</p>
  83 <p class="p2"><br></p>
  84 <p class="p4">// allocate a buffer with a sound file</p>
  85 <p class="p7"><span class="s5">b = </span><span class="s4">Buffer</span><span class="s5">.read(s, </span>"sounds/a11wlk01.wav"<span class="s5">);</span></p>
  86 <p class="p2"><br></p>
  87 <p class="p4">// simple playback (more examples: see BufRd)</p>
  88 <p class="p4">// Start and end here are defined as 0 and the number of frames in the buffer.</p>
  89 <p class="p4">// This means that the Phasor will output values from 0 to numFrames - 1 before looping,</p>
  90 <p class="p4">// which is perfect for driving BufRd. (See note above)</p>
  91 <p class="p5">{ <span class="s4">BufRd</span>.ar(1, b, <span class="s4">Phasor</span>.ar(0, <span class="s4">BufRateScale</span>.kr(b), 0, <span class="s4">BufFrames</span>.kr(b))) }.play;</p>
  92 <p class="p2"><br></p>
  93 <p class="p2"><br></p>
  94 <p class="p4">// two phasors control two sound file positions: mouse y controls resetPos of the second</p>
  95 <p class="p5">(</p>
  96 <p class="p5">{ <span class="s4">var</span> trig, rate, framesInBuffer;</p>
  97 <p class="p5"><span class="Apple-tab-span">     </span>rate = <span class="s4">MouseX</span>.kr(0.1, 100, 1);</p>
  98 <p class="p5"><span class="Apple-tab-span">     </span>trig = <span class="s4">Impulse</span>.ar(rate);</p>
  99 <p class="p5"><span class="Apple-tab-span">     </span>framesInBuffer = <span class="s4">BufFrames</span>.kr(b);</p>
 100 <p class="p5"><span class="Apple-tab-span">     </span>x = <span class="s4">Phasor</span>.ar(trig, <span class="s4">BufRateScale</span>.kr(b), 0, framesInBuffer,<span class="Apple-converted-space"> </span></p>
 101 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>[0, <span class="s4">MouseY</span>.kr(0, framesInBuffer)]);</p>
 102 <p class="p5"><span class="Apple-tab-span">     </span><span class="s4">BufRd</span>.ar(1, b, x);</p>
 103 <p class="p5">}.play;</p>
 104 <p class="p5">)</p>
 105 <p class="p2"><br></p>
 106 <p class="p2"><br></p>
 107 <p class="p2"><br></p>
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