HelpSource/Classes/StandardN.schelp

   1 class:: StandardN
   2 summary:: Standard map chaotic generator
   3 categories:: UGens>Generators>Chaotic
   4 related:: Classes/StandardL
   5
   6 description::
   7 A non-interpolating sound generator based on the difference equations:
   8
   9 code::
  10         x[n+1] = (x[n] + y[n+1]) % 2pi
  11         y[n+1] = (y[n] + k * sin(x[n])) % 2pi
  12 ::
  13 warning:: revise formulae conversion to c like code ::
  14
  15 The standard map is an area preserving map of a cylinder discovered by the plasma physicist Boris Chirikov.
  16
  17 classmethods::
  18 method:: ar
  19 argument:: freq
  20 Iteration frequency in Hertz
  21 argument:: k
  22 Perturbation amount
  23 argument:: xi
  24 Initial value of x
  25 argument:: yi
  26 Initial value of y
  27
  28 examples::
  29 code::
  30 // vary frequency
  31 { StandardN.ar(MouseX.kr(20, SampleRate.ir)) * 0.3 }.play(s);
  32 ::
  33
  34 code::
  35 // mouse-controlled param
  36 { StandardN.ar(SampleRate.ir/2, MouseX.kr(0.9,4)) * 0.3 }.play(s);
  37 ::
  38
  39 code::
  40 // as a frequency control
  41 { SinOsc.ar(StandardN.ar(40, MouseX.kr(0.9,4))*800+900)*0.4 }.play(s);
  42 ::