interpretor/preprocessor/faust-0.9.47mr3/benchmark/freeverb.dsp

   1 declare name            "freeverb";
   2 declare version         "1.0";
   3 declare author          "Grame";
   4 declare license         "BSD";
   5 declare copyright       "(c)GRAME 2006";
   6
   7 //======================================================
   8 //
   9 //                                              Freeverb
  10 //                Faster version using fixed delays (20% gain)
  11 //
  12 //======================================================
  13
  14
  15 // Constant Parameters
  16 //--------------------
  17
  18 fixedgain       = 0.015;
  19 scalewet        = 3.0;
  20 scaledry        = 2.0;
  21 scaledamp       = 0.4;
  22 scaleroom       = 0.28;
  23 offsetroom      = 0.7;
  24 initialroom     = 0.5;
  25 initialdamp     = 0.5;
  26 initialwet      = 1.0/scalewet;
  27 initialdry      = 0;
  28 initialwidth= 1.0;
  29 initialmode     = 0.0;
  30 freezemode      = 0.5;
  31 stereospread= 23;
  32 allpassfeed     = 0.5;
  33
  34
  35 // Filter Parametres
  36 //------------------
  37
  38 combtuningL1    = 1116;
  39 combtuningL2    = 1188;
  40 combtuningL3    = 1277;
  41 combtuningL4    = 1356;
  42 combtuningL5    = 1422;
  43 combtuningL6    = 1491;
  44 combtuningL7    = 1557;
  45 combtuningL8    = 1617;
  46
  47 allpasstuningL1 = 556;
  48 allpasstuningL2 = 441;
  49 allpasstuningL3 = 341;
  50 allpasstuningL4 = 225;
  51
  52
  53 // Control Sliders
  54 //--------------------
  55 // Damp : filtrage des aigus des echos (surtout actif pour des grandes valeurs de RoomSize)
  56 // RoomSize : taille de la piece
  57 // Dry : signal original
  58 // Wet : signal avec reverbration
  59
  60 dampSlider              = hslider("Damp",0.5, 0, 1, 0.025)*scaledamp;
  61 roomsizeSlider  = hslider("RoomSize", 0.5, 0, 1, 0.025)*scaleroom + offsetroom;
  62 wetSlider               = hslider("Wet", 0.3333, 0, 1, 0.025);
  63 drySlider               = hslider("Dry", 0, 0, 1, 0.025);
  64 combfeed                = roomsizeSlider;
  65
  66
  67
  68
  69
  70 // Comb and Allpass filters
  71 //-------------------------
  72
  73 allpass(dt,fb) = (_,_ <: (*(fb),_:+:@(dt)), -) ~ _ : (!,_);
  74
  75 comb(dt, fb, damp) = (+:@(dt)) ~ (*(1-damp) : (+ ~ *(damp)) : *(fb));
  76
  77
  78 // Reverb components
  79 //------------------
  80
  81 monoReverb(fb1, fb2, damp, spread)
  82         = _ <:  comb(combtuningL1+spread, fb1, damp),
  83                         comb(combtuningL2+spread, fb1, damp),
  84                         comb(combtuningL3+spread, fb1, damp),
  85                         comb(combtuningL4+spread, fb1, damp),
  86                         comb(combtuningL5+spread, fb1, damp),
  87                         comb(combtuningL6+spread, fb1, damp),
  88                         comb(combtuningL7+spread, fb1, damp),
  89                         comb(combtuningL8+spread, fb1, damp)
  90                 :>
  91                         allpass (allpasstuningL1+spread, fb2)
  92                 :       allpass (allpasstuningL2+spread, fb2)
  93                 :       allpass (allpasstuningL3+spread, fb2)
  94                 :       allpass (allpasstuningL4+spread, fb2)
  95                 ;
  96
  97 stereoReverb(fb1, fb2, damp, spread)
  98         = + <:  monoReverb(fb1, fb2, damp, 0), monoReverb(fb1, fb2, damp, spread);
  99
 100
 101 // fxctrl : add an input gain and a wet-dry control to a stereo FX
 102 //----------------------------------------------------------------
 103
 104 fxctrl(g,w,Fx) =  _,_ <: (*(g),*(g) : Fx : *(w),*(w)), *(1-w), *(1-w) +> _,_;
 105
 106
 107
 108 // Freeverb
 109 //---------
 110
 111 freeverb = vgroup("Freeverb", fxctrl(fixedgain, wetSlider, stereoReverb(combfeed, allpassfeed, dampSlider, stereospread)));
 112
 113 process = freeverb;