interpretor/preprocessor/faust-0.9.47mr3/examples/faust-stk/modalBar.dsp

   1 declare name "Modal Bar";
   2 declare description "Nonlinear Modal percussive instruments";
   3 declare author "Romain Michon (rmichon@ccrma.stanford.edu)";
   4 declare copyright "Romain Michon";
   5 declare version "1.0";
   6 declare licence "STK-4.3"; // Synthesis Tool Kit 4.3 (MIT style license);
   7 declare description "A number of different struck bar instruments. Presets numbers: 0->Marimba, 1->Vibraphone, 2->Agogo, 3->Wood1, 4->Reso, 5->Wood2, 6->Beats, 7->2Fix; 8->Clump";
   8
   9 import("music.lib");
  10 import("instrument.lib");
  11
  12 //==================== GUI SPECIFICATION ================
  13
  14 freq = nentry("h:Basic_Parameters/freq [1][unit:Hz] [tooltip:Tone frequency]",440,20,20000,1);
  15 gain = nentry("h:Basic_Parameters/gain [1][tooltip:Gain (value between 0 and 1)]",0.8,0,1,0.01);
  16 gate = button("h:Basic_Parameters/gate [1][tooltip:noteOn = 1, noteOff = 0]");
  17
  18 stickHardness = hslider("h:Physical_and_Nonlinearity/v:Physical_Parameters/Stick_Hardness
  19 [2][tooltip:A value between 0 and 1]",0.25,0,1,0.01);
  20 reson = nentry("h:Physical_and_Nonlinearity/v:Physical_Parameters/Resonance
  21 [2][tooltip:A value between 0 and 1]",1,0,1,1);
  22 presetNumber = nentry("h:Physical_and_Nonlinearity/v:Physical_Parameters/Preset
  23 [2][tooltip:0->Marimba, 1->Vibraphone, 2->Agogo, 3->Wood1, 4->Reso, 5->Wood2, 6->Beats, 7->2Fix; 8->Clump]",1,0,8,1);
  24
  25 typeModulation = nentry("h:Physical_and_Nonlinearity/v:Nonlinear_Filter_Parameters/Modulation_Type
  26 [3][tooltip: 0=theta is modulated by the incoming signal; 1=theta is modulated by the averaged incoming signal;
  27 2=theta is modulated by the squared incoming signal; 3=theta is modulated by a sine wave of frequency freqMod;
  28 4=theta is modulated by a sine wave of frequency freq;]",0,0,4,1);
  29 nonLinearity = hslider("h:Physical_and_Nonlinearity/v:Nonlinear_Filter_Parameters/Nonlinearity
  30 [3][tooltip:Nonlinearity factor (value between 0 and 1)]",0,0,1,0.01);
  31 frequencyMod = hslider("h:Physical_and_Nonlinearity/v:Nonlinear_Filter_Parameters/Modulation_Frequency
  32 [3][unit:Hz][tooltip:Frequency of the sine wave for the modulation of theta (works if Modulation Type=3)]",220,20,1000,0.1);
  33 nonLinAttack = hslider("h:Physical_and_Nonlinearity/v:Nonlinear_Filter_Parameters/Nonlinearity_Attack
  34 [3][unit:s][Attack duration of the nonlinearity]",0.1,0,2,0.01);
  35
  36 vibratoFreq = hslider("h:Envelopes_and_Vibrato/v:Vibrato_Parameters/Vibrato_Freq
  37 [4][unit:Hz]",6,1,15,0.1);
  38 vibratoGain = hslider("h:Envelopes_and_Vibrato/v:Vibrato_Parameters/Vibrato_Gain
  39 [4][tooltip:A value between 0 and 1]",0.1,0,1,0.01);
  40
  41 //==================== SIGNAL PROCESSING ================
  42
  43 //----------------------- Nonlinear filter ----------------------------
  44 //nonlinearities are created by the nonlinear passive allpass ladder filter declared in filter.lib
  45
  46 //nonlinear filter order
  47 nlfOrder = 6;
  48
  49 //nonLinearModultor is declared in instrument.lib, it adapts allpassnn from filter.lib
  50 //for using it with waveguide instruments
  51 NLFM =  nonLinearModulator((nonLinearity : smooth(0.999)),1,freq,
  52      typeModulation,(frequencyMod : smooth(0.999)),nlfOrder);
  53
  54 //----------------------- Synthesis parameters computing and functions declaration ----------------------------
  55
  56 //stereoizer is declared in instrument.lib and implement a stereo spacialisation in function of
  57 //the frequency period in number of samples
  58 stereo = stereoizer(SR/freq);
  59
  60 //check if the vibraphone is used
  61 vibratoOn = presetNumber == 1;
  62
  63 //vibrato
  64 vibrato = 1 + osc(vibratoFreq)*vibratoGain*vibratoOn;
  65
  66 //filter bank output gain
  67 directGain = loadPreset(presetNumber,3,2);
  68
  69 //modal values for the filter bank
  70 loadPreset = ffunction(float loadPreset (int,int,int), <modalBar.h>,"");
  71
  72 //filter bank using biquad filters
  73 biquadBank = _ <: sum(i, 4, oneFilter(i))
  74         with{
  75                 condition(x) = x<0 <: *(-x),((-(1))*-1)*x*freq :> +;
  76                 dampCondition = (gate < 1) & (reson != 1);
  77
  78                 //the filter coefficients are interpolated when changing of preset
  79                 oneFilter(j,y) = (loadPreset(presetNumber,0,j : smooth(0.999)) : condition),
  80                                                 loadPreset(presetNumber,1,j : smooth(0.999))*(1-(gain*0.03*dampCondition)),
  81                                                 y*(loadPreset(presetNumber,2,j) : smooth(0.999)) : bandPassH;
  82         };
  83
  84 //one pole filter with pole set at 0.9 for pre-filtering, onePole is declared in instrument.lib
  85 sourceFilter = onePole(b0,a1)
  86         with{
  87                 b0 = 1 - 0.9;
  88                 a1 = -0.9;
  89         };
  90
  91 //excitation signal
  92 excitation = counterSamples < (marmstk1TableSize*rate) : *(marmstk1Wave*gate)
  93            with{
  94                 //readMarmstk1 and marmstk1TableSize are both declared in instrument.lib
  95                 marmstk1 = time%marmstk1TableSize : int : readMarmstk1;
  96
  97                 dataRate(readRate) = readRate : (+ : decimal) ~ _ : *(float(marmstk1TableSize));
  98
  99                 //the reading rate of the stick table is defined in function of the stickHardness
 100                 rate = 0.25*pow(4,stickHardness);
 101
 102                 counterSamples = (*(gate)+1)~_ : -(1);
 103                 marmstk1Wave = rdtable(marmstk1TableSize,marmstk1,int(dataRate(rate)*gate));
 104            };
 105
 106 process = excitation : sourceFilter : *(gain) <:
 107         //resonance
 108         (biquadBank <: -(*(directGain))) + (directGain*_) :
 109         //vibrato for the vibraphone
 110         *(vibrato) : NLFM*0.6 : stereo : instrReverb;