interpreter/preprocessor/faust-0.9.47mr3/tools/faust2pd/examples/synth/freeverb.dsp

   1 //======================================================
   2 //
   3 //                                              Freeverb
   4 //                Faster version using fixed delays (20% gain)
   5 //
   6 //======================================================
   7
   8 declare name "freeverb -- a Schroeder reverb";
   9 declare author "Yann Orlarey";
  10 declare version "1.0";
  11
  12 // Constant Parameters
  13 //--------------------
  14
  15 fixedgain       = 0.015;
  16 scalewet        = 3.0;
  17 scaledry        = 2.0;
  18 scaledamp       = 0.4;
  19 scaleroom       = 0.28;
  20 offsetroom      = 0.7;
  21 initialroom     = 0.5;
  22 initialdamp     = 0.5;
  23 initialwet      = 1.0/scalewet;
  24 initialdry      = 0;
  25 initialwidth= 1.0;
  26 initialmode     = 0.0;
  27 freezemode      = 0.5;
  28 stereospread= 23;
  29 allpassfeed     = 0.5;
  30
  31
  32 // Filter Parametres
  33 //------------------
  34
  35 combtuningL1    = 1116;
  36 combtuningL2    = 1188;
  37 combtuningL3    = 1277;
  38 combtuningL4    = 1356;
  39 combtuningL5    = 1422;
  40 combtuningL6    = 1491;
  41 combtuningL7    = 1557;
  42 combtuningL8    = 1617;
  43
  44 allpasstuningL1 = 556;
  45 allpasstuningL2 = 441;
  46 allpasstuningL3 = 341;
  47 allpasstuningL4 = 225;
  48
  49
  50 // Control Sliders
  51 //--------------------
  52 // Damp : filtrage des aigus des echos (surtout actif pour des grandes valeurs de RoomSize)
  53 // RoomSize : taille de la piece
  54 // Dry : signal original
  55 // Wet : signal avec reverb\8eration
  56
  57 dampSlider              = hslider("damp",0.5, 0, 1, 0.025)*scaledamp;
  58 roomsizeSlider  = hslider("roomsize", 0.5, 0, 1, 0.025)*scaleroom + offsetroom;
  59 wetSlider               = hslider("wet", 0.25, 0, 1, 0.025);
  60 drySlider               = hslider("dry", 0, 0, 1, 0.025);
  61 combfeed                = roomsizeSlider;
  62
  63
  64
  65
  66
  67 // Comb and Allpass filters
  68 //-------------------------
  69
  70 allpass(dt,fb) = (_,_ <: (*(fb),_:+:@(dt)), -) ~ _ : (!,_);
  71
  72 comb(dt, fb, damp) = (+:@(dt)) ~ (*(1-damp) : (+ ~ *(damp)) : *(fb));
  73
  74
  75 // Reverb components
  76 //------------------
  77
  78 monoReverb(fb1, fb2, damp, spread)
  79         = _ <:  comb(combtuningL1+spread, fb1, damp),
  80                         comb(combtuningL2+spread, fb1, damp),
  81                         comb(combtuningL3+spread, fb1, damp),
  82                         comb(combtuningL4+spread, fb1, damp),
  83                         comb(combtuningL5+spread, fb1, damp),
  84                         comb(combtuningL6+spread, fb1, damp),
  85                         comb(combtuningL7+spread, fb1, damp),
  86                         comb(combtuningL8+spread, fb1, damp)
  87                 +>
  88                         allpass (allpasstuningL1+spread, fb2)
  89                 :       allpass (allpasstuningL2+spread, fb2)
  90                 :       allpass (allpasstuningL3+spread, fb2)
  91                 :       allpass (allpasstuningL4+spread, fb2)
  92                 ;
  93
  94 stereoReverb(fb1, fb2, damp, spread)
  95         = + <:  monoReverb(fb1, fb2, damp, 0), monoReverb(fb1, fb2, damp, spread);
  96
  97
  98 // fxctrl : add an input gain and a wet-dry control to a stereo FX
  99 //----------------------------------------------------------------
 100
 101 fxctrl(g,w,Fx) =  _,_ <: (*(g),*(g) : Fx : *(w),*(w)), *(1-w), *(1-w) +> _,_;
 102
 103
 104
 105 // Freeverb
 106 //---------
 107
 108 freeverb = vgroup("freeverb", fxctrl(fixedgain, wetSlider, stereoReverb(combfeed, allpassfeed, dampSlider, stereospread)));
 109
 110 process = freeverb;