interpretor/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/phasemod.syn

   1
   2 declare name "phasemod -- phase modulation synth";
   3 declare author "Albert Graef";
   4 declare version "1.0";
   5
   6 import("music.lib");
   7
   8 // control variables
   9
  10 // master volume and pan
  11 vol     = hslider("vol", 0.3, 0, 10, 0.01);     // %
  12 pan     = hslider("pan", 0.5, 0, 1, 0.01);      // %
  13
  14 // ADSR envelop
  15 attack  = hslider("attack", 0.01, 0, 1, 0.001); // sec
  16 decay   = hslider("decay", 0.3, 0, 1, 0.001);   // sec
  17 sustain = hslider("sustain", 0.5, 0, 1, 0.01);  // %
  18 release = hslider("release", 0.2, 0, 1, 0.001); // sec
  19
  20 // voice parameters
  21 freq    = nentry("freq", 440, 20, 20000, 1);    // Hz
  22 gain    = nentry("gain", 1, 0, 10, 0.01);       // %
  23 gate    = button("gate");                       // 0/1
  24
  25 // generic table-driven oscillator with phase modulation
  26
  27 // n    = the size of the table, must be a power of 2
  28 // f    = the wave function, must be defined on the range [0,2*PI]
  29 // freq = the desired frequency in Hz
  30 // mod  = the phase modulation signal, in radians
  31
  32 tblosc(n,f,freq,mod)    = (1-d)*rdtable(n,waveform,i&(n-1)) +
  33                           d*rdtable(n,waveform,(i+1)&(n-1))
  34 with {
  35         waveform        = time*(2.0*PI)/n : f;
  36         phase           = freq/SR : (+ : decimal) ~ _;
  37         modphase        = decimal(phase+mod/(2*PI))*n;
  38         i               = int(floor(modphase));
  39         d               = decimal(modphase);
  40 };
  41
  42 // phase modulation synth (sine modulated by another sine)
  43
  44 smooth(c) = *(1-c) : +~*(c);
  45
  46 process = tblosc(1<<16, sin, freq, mod) * env * (gain:smooth(0.999))
  47   :  vgroup("2-master", *(vol) : panner(pan))
  48 with {
  49         env = gate : vgroup("1-adsr", adsr(attack, decay, sustain, release));
  50         mod = 2*PI*tblosc(1<<16, sin, freq, 0)*env;
  51 };