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trombone.js
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trombone.js
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var backCanvas;
var backCtx;
var tractCanvas;
var tractCtx;
var isFirefox;
var browser;
var audioContextParent;
var FakeDomObject = function(){
return {
addEventListener: function(event, callback){
},
}
}
var isBrowser = false;
if(typeof(window) !== "undefined"){
isBrowser = true;
backCanvas = document.getElementById("backCanvas");
backCtx = backCanvas.getContext("2d");
tractCanvas = document.getElementById("tractCanvas");
tractCtx = tractCanvas.getContext("2d");
isFirefox = false;
browser=navigator.userAgent.toLowerCase();
if (browser.indexOf('firefox') > -1) isFirefox = true;
document.body.style.cursor = 'pointer';
audioContextParent = window;
} else {
backCanvas = new FakeDomObject;
backCtx = null;
tractCanvas = new FakeDomObject;
tractCtx = null;
audioContextParent = {
AudioContext: AudioContext,
}
}
Math.clamp = function(number, min, max) {
if (number<min) return min;
else if (number>max) return max;
else return number;
}
Math.moveTowards = function(current, target, amount)
{
if (current<target) return Math.min(current+amount, target);
else return Math.max(current-amount, target);
}
Math.moveTowards = function(current, target, amountUp, amountDown)
{
if (current<target) return Math.min(current+amountUp, target);
else return Math.max(current-amountDown, target);
}
Math.gaussian = function()
{
var s = 0;
for (var c=0; c<16; c++) s+=Math.random();
return (s-8)/4;
}
var sampleRate;
var time = 0;
var temp = {a:0, b:0};
var alwaysVoice = true;
var autoWobble = true;
var noiseFreq = 500;
var noiseQ = 0.7;
var palePink = "#FFEEF5";
var UI =
{
width : 600,
top_margin : 5,
left_margin : 5,
inAboutScreen : true,
inInstructionsScreen : false,
instructionsLine : 0,
debugText : "",
init : function()
{
this.touchesWithMouse = [];
this.mouseTouch = {alive: false, endTime: 0};
this.mouseDown = false;
this.aboutButton = makeButton(460, 392, 140, 30, "about...", true);
this.alwaysVoiceButton = makeButton(460, 428, 140, 30, "always voice", true);
this.autoWobbleButton = makeButton(460, 464, 140, 30, "pitch wobble", true);
if(isBrowser)
{
tractCanvas.addEventListener('touchstart', UI.startTouches);
tractCanvas.addEventListener('touchmove', UI.moveTouches);
tractCanvas.addEventListener('touchend', UI.endTouches);
tractCanvas.addEventListener('touchcancel', UI.endTouches);
document.addEventListener('touchstart', (function(event) {event.preventDefault();}) );
document.addEventListener('mousedown', (function(event)
{UI.mouseDown = true; event.preventDefault(); UI.startMouse(event);}));
document.addEventListener('mouseup', (function(event)
{UI.mouseDown = false; UI.endMouse(event);}));
document.addEventListener('mousemove', UI.moveMouse);
}
},
draw : function()
{
this.alwaysVoiceButton.draw(tractCtx);
this.autoWobbleButton.draw(tractCtx);
this.aboutButton.draw(tractCtx);
if (this.inAboutScreen) this.drawAboutScreen();
else if (this.inInstructionsScreen) this.drawInstructionsScreen();
},
drawAboutScreen : function()
{
var ctx = tractCtx;
ctx.globalAlpha = 0.8;
ctx.fillStyle = "white";
ctx.rect(0,0,600,600);
ctx.fill();
this.drawAboutText();
},
drawAboutText : function()
{
var ctx = tractCtx;
ctx.globalAlpha = 1.0;
ctx.fillStyle = "#C070C6";
ctx.strokeStyle = "#C070C6";
ctx.font="50px Arial";
ctx.lineWidth = 3;
ctx.textAlign = "center";
ctx.strokeText("P i n k T r o m b o n e", 300, 230);
ctx.fillText("P i n k T r o m b o n e", 300, 230);
ctx.font="28px Arial";
ctx.fillText("bare-handed speech synthesis", 300, 330);
ctx.font="20px Arial";
//ctx.fillText("(tap to start)", 300, 380);
if (isFirefox)
{
ctx.font="20px Arial";
ctx.fillText("(sorry - may work poorly with the Firefox browser)", 300, 430);
}
},
drawInstructionsScreen : function()
{
AudioSystem.mute();
var ctx = tractCtx;
ctx.globalAlpha = 0.85;
ctx.fillStyle = "white";
ctx.rect(0,0,600,600);
ctx.fill();
ctx.globalAlpha = 1.0;
ctx.fillStyle = "#C070C6";
ctx.strokeStyle = "#C070C6";
ctx.font="24px Arial";
ctx.lineWidth = 2;
ctx.textAlign = "center";
ctx.font = "19px Arial";
ctx.textAlign = "left";
this.instructionsLine = 0;
this.write("Sound is generated in the glottis (at the bottom left) then ");
this.write("filtered by the shape of the vocal tract. The voicebox ");
this.write("controls the pitch and intensity of the initial sound.");
this.write("");
this.write("Then, to talk:");
this.write("");
this.write("- move the body of the tongue to shape vowels");
this.write("");
this.write("- touch the oral cavity to narrow it, for fricative consonants");
this.write("");
this.write("- touch above the oral cavity to close it, for stop consonants");
this.write("");
this.write("- touch the nasal cavity to open the velum and let sound ");
this.write(" flow through the nose.");
this.write("");
this.write("");
this.write("(tap anywhere to continue)");
ctx.textAlign = "center";
ctx.fillText("[tap here to RESET]", 470, 535);
this.instructionsLine = 18.8;
ctx.textAlign = "left";
this.write("Pink Trombone v1.1");
this.write("by Neil Thapen");
ctx.fillStyle = "blue";
ctx.globalAlpha = 0.6;
this.write("venuspatrol.nfshost.com");
/*ctx.beginPath();
ctx.rect(35, 535, 230, 35);
ctx.rect(370, 505, 200, 50);
ctx.fill();*/
ctx.globalAlpha = 1.0;
},
instructionsScreenHandleTouch : function(x,y)
{
if ((x >=35 && x<=265) && (y>=535 && y<=570)) window.location.href = "http://venuspatrol.nfshost.com";
else if ((x>=370 && x<=570) && (y>=505 && y<=555)) location.reload(false);
else
{
UI.inInstructionsScreen = false;
UI.aboutButton.switchedOn = true;
AudioSystem.unmute();
}
},
write : function(text)
{
tractCtx.fillText(text, 50, 100 + this.instructionsLine*22);
this.instructionsLine += 1;
if (text == "") this.instructionsLine -= 0.3;
},
buttonsHandleTouchStart : function(touch)
{
this.alwaysVoiceButton.handleTouchStart(touch);
alwaysVoice = this.alwaysVoiceButton.switchedOn;
this.autoWobbleButton.handleTouchStart(touch);
autoWobble = this.autoWobbleButton.switchedOn;
this.aboutButton.handleTouchStart(touch);
},
startTouches : function(event)
{
event.preventDefault();
if (!AudioSystem.started)
{
AudioSystem.started = true;
AudioSystem.startSound();
}
if (UI.inAboutScreen)
{
UI.inAboutScreen = false;
return;
}
if (UI.inInstructionsScreen)
{
var touches = event.changedTouches;
for (var j=0; j<touches.length; j++)
{
var x = (touches[j].pageX-UI.left_margin)/UI.width*600;
var y = (touches[j].pageY-UI.top_margin)/UI.width*600;
}
UI.instructionsScreenHandleTouch(x,y);
return;
}
var touches = event.changedTouches;
for (var j=0; j<touches.length; j++)
{
var touch = {};
touch.startTime = time;
touch.endTime = 0;
touch.fricative_intensity = 0;
touch.alive = true;
touch.id = touches[j].identifier;
touch.x = (touches[j].pageX-UI.left_margin)/UI.width*600;
touch.y = (touches[j].pageY-UI.top_margin)/UI.width*600;
touch.index = TractUI.getIndex(touch.x, touch.y);
touch.diameter = TractUI.getDiameter(touch.x, touch.y);
UI.touchesWithMouse.push(touch);
UI.buttonsHandleTouchStart(touch);
}
UI.handleTouches();
},
getTouchById : function(id)
{
for (var j=0; j<UI.touchesWithMouse.length; j++)
{
if (UI.touchesWithMouse[j].id == id && UI.touchesWithMouse[j].alive) return UI.touchesWithMouse[j];
}
return 0;
},
moveTouches : function(event)
{
var touches = event.changedTouches;
for (var j=0; j<touches.length; j++)
{
var touch = UI.getTouchById(touches[j].identifier);
if (touch != 0)
{
touch.x = (touches[j].pageX-UI.left_margin)/UI.width*600;
touch.y = (touches[j].pageY-UI.top_margin)/UI.width*600;
touch.index = TractUI.getIndex(touch.x, touch.y);
touch.diameter = TractUI.getDiameter(touch.x, touch.y);
}
}
UI.handleTouches();
},
endTouches : function(event)
{
var touches = event.changedTouches;
for (var j=0; j<touches.length; j++)
{
var touch = UI.getTouchById(touches[j].identifier);
if (touch != 0)
{
touch.alive = false;
touch.endTime = time;
}
}
UI.handleTouches();
if (!UI.aboutButton.switchedOn)
{
UI.inInstructionsScreen = true;
}
},
startMouse : function(event)
{
if (!AudioSystem.started)
{
AudioSystem.started = true;
AudioSystem.startSound();
}
if (UI.inAboutScreen)
{
UI.inAboutScreen = false;
return;
}
if (UI.inInstructionsScreen)
{
var x = (event.pageX-tractCanvas.offsetLeft)/UI.width*600;
var y = (event.pageY-tractCanvas.offsetTop)/UI.width*600;
UI.instructionsScreenHandleTouch(x,y);
return;
}
var touch = {};
touch.startTime = time;
touch.fricative_intensity = 0;
touch.endTime = 0;
touch.alive = true;
touch.id = "mouse"+Math.random();
touch.x = (event.pageX-tractCanvas.offsetLeft)/UI.width*600;
touch.y = (event.pageY-tractCanvas.offsetTop)/UI.width*600;
touch.index = TractUI.getIndex(touch.x, touch.y);
touch.diameter = TractUI.getDiameter(touch.x, touch.y);
UI.mouseTouch = touch;
UI.touchesWithMouse.push(touch);
UI.buttonsHandleTouchStart(touch);
UI.handleTouches();
},
moveMouse : function(event)
{
var touch = UI.mouseTouch;
if (!touch.alive) return;
touch.x = (event.pageX-tractCanvas.offsetLeft)/UI.width*600;
touch.y = (event.pageY-tractCanvas.offsetTop)/UI.width*600;
touch.index = TractUI.getIndex(touch.x, touch.y);
touch.diameter = TractUI.getDiameter(touch.x, touch.y);
UI.handleTouches();
},
endMouse : function(event)
{
var touch = UI.mouseTouch;
if (!touch.alive) return;
touch.alive = false;
touch.endTime = time;
UI.handleTouches();
if (!UI.aboutButton.switchedOn) UI.inInstructionsScreen = true;
},
handleTouches : function(event)
{
TractUI.handleTouches();
Glottis.handleTouches();
},
updateTouches : function()
{
var fricativeAttackTime = 0.1;
for (var j=UI.touchesWithMouse.length-1; j >=0; j--)
{
var touch = UI.touchesWithMouse[j];
if (!(touch.alive) && (time > touch.endTime + 1))
{
UI.touchesWithMouse.splice(j,1);
}
else if (touch.alive)
{
touch.fricative_intensity = Math.clamp((time-touch.startTime)/fricativeAttackTime, 0, 1);
}
else
{
touch.fricative_intensity = Math.clamp(1-(time-touch.endTime)/fricativeAttackTime, 0, 1);
}
}
},
shapeToFitScreen : function()
{
if (window.innerWidth <= window.innerHeight)
{
this.width = window.innerWidth-10;
this.left_margin = 5;
this.top_margin = 0.5*(window.innerHeight-this.width);
}
else
{
this.width = window.innerHeight-10;
this.left_margin = 0.5*(window.innerWidth-this.width);
this.top_margin = 5;
}
document.body.style.marginLeft = this.left_margin;
document.body.style.marginTop = this.top_margin;
tractCanvas.style.width = this.width;
backCanvas.style.width = this.width;
}
}
var AudioSystem =
{
blockLength : 512,
blockTime : 1,
started : false,
soundOn : false,
init : function ()
{
audioContextParent.AudioContext = audioContextParent.AudioContext||audioContextParent.webkitAudioContext;
this.audioContext = new audioContextParent.AudioContext();
if(!isBrowser){
console.log("setting out to stdout");
this.audioContext.outStream = process.stdout;
}
sampleRate = this.audioContext.sampleRate;
this.blockTime = this.blockLength/sampleRate;
},
startSound : function()
{
//scriptProcessor may need a dummy input channel on iOS
this.scriptProcessor = this.audioContext.createScriptProcessor(this.blockLength, 2, 1);
this.scriptProcessor.connect(this.audioContext.destination);
this.scriptProcessor.onaudioprocess = AudioSystem.doScriptProcessor;
var whiteNoise = this.createWhiteNoiseNode(2*sampleRate); // 2 seconds of noise
var aspirateFilter = this.audioContext.createBiquadFilter();
aspirateFilter.type = "bandpass";
aspirateFilter.frequency.value = 500;
aspirateFilter.Q.value = 0.5;
whiteNoise.connect(aspirateFilter);
aspirateFilter.connect(this.scriptProcessor);
var fricativeFilter = this.audioContext.createBiquadFilter();
fricativeFilter.type = "bandpass";
fricativeFilter.frequency.value = 1000;
fricativeFilter.Q.value = 0.5;
whiteNoise.connect(fricativeFilter);
fricativeFilter.connect(this.scriptProcessor);
whiteNoise.start(0);
},
createWhiteNoiseNode : function(frameCount)
{
var myArrayBuffer = this.audioContext.createBuffer(1, frameCount, sampleRate);
var nowBuffering = myArrayBuffer.getChannelData(0);
for (var i = 0; i < frameCount; i++)
{
nowBuffering[i] = Math.random();// gaussian();
}
var source = this.audioContext.createBufferSource();
source.buffer = myArrayBuffer;
source.loop = true;
return source;
},
doScriptProcessor : function(event)
{
var inputArray1 = event.inputBuffer.getChannelData(0);
var inputArray2 = event.inputBuffer.getChannelData(1);
var outArray = event.outputBuffer.getChannelData(0);
for (var j = 0, N = outArray.length; j < N; j++)
{
var lambda1 = j/N;
var lambda2 = (j+0.5)/N;
var glottalOutput = Glottis.runStep(lambda1, inputArray1[j]);
var vocalOutput = 0;
//Tract runs at twice the sample rate
Tract.runStep(glottalOutput, inputArray2[j], lambda1);
vocalOutput += Tract.lipOutput + Tract.noseOutput;
Tract.runStep(glottalOutput, inputArray2[j], lambda2);
vocalOutput += Tract.lipOutput + Tract.noseOutput;
outArray[j] = vocalOutput * 0.125;
}
Glottis.finishBlock();
Tract.finishBlock();
},
mute : function()
{
this.scriptProcessor.disconnect();
},
unmute : function()
{
this.scriptProcessor.connect(this.audioContext.destination);
}
}
var Glottis =
{
timeInWaveform : 0,
oldFrequency : 140,
newFrequency : 140,
UIFrequency : 140,
smoothFrequency : 140,
oldTenseness : 0.6,
newTenseness : 0.6,
UITenseness : 0.6,
totalTime : 0,
vibratoAmount : 0.005,
vibratoFrequency : 6,
intensity : 0,
loudness : 1,
isTouched : false,
ctx : backCtx,
touch : 0,
x : 240,
y : 530,
keyboardTop : 500,
keyboardLeft : 00,
keyboardWidth : 600,
keyboardHeight : 100,
semitones : 20,
marks : [0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0],
baseNote : 87.3071, //F
init : function()
{
this.setupWaveform(0);
if(isBrowser)
this.drawKeyboard();
},
drawKeyboard : function()
{
this.ctx.strokeStyle = palePink;
this.ctx.fillStyle = palePink;
backCtx.globalAlpha = 1.0;
backCtx.lineCap = 'round';
backCtx.lineJoin = 'round';
var radius = 2;
this.drawBar(0.0, 0.4, 8);
backCtx.globalAlpha = 0.7;
this.drawBar(0.52, 0.72, 8);
backCtx.strokeStyle = "orchid";
backCtx.fillStyle = "orchid";
for (var i=0; i< this.semitones; i++)
{
var keyWidth = this.keyboardWidth/this.semitones;
var x = this.keyboardLeft+(i+1/2)*keyWidth;
var y = this.keyboardTop;
if (this.marks[(i+3)%12]==1)
{
backCtx.lineWidth = 4;
backCtx.globalAlpha = 0.4;
}
else
{
backCtx.lineWidth = 3;
backCtx.globalAlpha = 0.2;
}
backCtx.beginPath();
backCtx.moveTo(x,y+9);
backCtx.lineTo(x, y+this.keyboardHeight*0.4-9);
backCtx.stroke();
backCtx.lineWidth = 3;
backCtx.globalAlpha = 0.15;
backCtx.beginPath();
backCtx.moveTo(x,y+this.keyboardHeight*0.52+6);
backCtx.lineTo(x, y+this.keyboardHeight*0.72-6);
backCtx.stroke();
}
backCtx.fillStyle = "orchid";
backCtx.font="17px Arial";
backCtx.textAlign = "center";
backCtx.globalAlpha = 0.7;
backCtx.fillText("voicebox control", 300, 490);
backCtx.fillText("pitch", 300, 592);
backCtx.globalAlpha = 0.3;
backCtx.strokeStyle = "orchid";
backCtx.fillStyle = "orchid";
backCtx.save()
backCtx.translate(410, 587);
this.drawArrow(80, 2, 10);
backCtx.translate(-220, 0);
backCtx.rotate(Math.PI);
this.drawArrow(80, 2, 10);
backCtx.restore();
backCtx.globalAlpha=1.0;
},
drawBar : function(topFactor, bottomFactor, radius)
{
backCtx.lineWidth = radius*2;
backCtx.beginPath();
backCtx.moveTo(this.keyboardLeft+radius, this.keyboardTop+topFactor*this.keyboardHeight+radius);
backCtx.lineTo(this.keyboardLeft+this.keyboardWidth-radius, this.keyboardTop+topFactor*this.keyboardHeight+radius);
backCtx.lineTo(this.keyboardLeft+this.keyboardWidth-radius, this.keyboardTop+bottomFactor*this.keyboardHeight-radius);
backCtx.lineTo(this.keyboardLeft+radius, this.keyboardTop+bottomFactor*this.keyboardHeight-radius);
backCtx.closePath();
backCtx.stroke();
backCtx.fill();
},
drawArrow : function(l, ahw, ahl)
{
backCtx.lineWidth = 2;
backCtx.beginPath();
backCtx.moveTo(-l, 0);
backCtx.lineTo(0,0);
backCtx.lineTo(0, -ahw);
backCtx.lineTo(ahl, 0);
backCtx.lineTo(0, ahw);
backCtx.lineTo(0,0);
backCtx.closePath();
backCtx.stroke();
backCtx.fill();
},
handleTouches : function()
{
if (this.touch != 0 && !this.touch.alive) this.touch = 0;
if (this.touch == 0)
{
for (var j=0; j<UI.touchesWithMouse.length; j++)
{
var touch = UI.touchesWithMouse[j];
if (!touch.alive) continue;
if (touch.y<this.keyboardTop) continue;
this.touch = touch;
}
}
if (this.touch != 0)
{
var local_y = this.touch.y - this.keyboardTop-10;
var local_x = this.touch.x - this.keyboardLeft;
local_y = Math.clamp(local_y, 0, this.keyboardHeight-26);
var semitone = this.semitones * local_x / this.keyboardWidth + 0.5;
Glottis.UIFrequency = this.baseNote * Math.pow(2, semitone/12);
if (Glottis.intensity == 0) Glottis.smoothFrequency = Glottis.UIFrequency;
//Glottis.UIRd = 3*local_y / (this.keyboardHeight-20);
var t = Math.clamp(1-local_y / (this.keyboardHeight-28), 0, 1);
Glottis.UITenseness = 1-Math.cos(t*Math.PI*0.5);
Glottis.loudness = Math.pow(Glottis.UITenseness, 0.25);
this.x = this.touch.x;
this.y = local_y + this.keyboardTop+10;
}
Glottis.isTouched = (this.touch != 0);
},
runStep : function(lambda, noiseSource)
{
var timeStep = 1.0 / sampleRate;
this.timeInWaveform += timeStep;
this.totalTime += timeStep;
if (this.timeInWaveform>this.waveformLength)
{
this.timeInWaveform -= this.waveformLength;
this.setupWaveform(lambda);
}
var out = this.normalizedLFWaveform(this.timeInWaveform/this.waveformLength);
var aspiration = this.intensity*(1-Math.sqrt(this.UITenseness))*this.getNoiseModulator()*noiseSource;
aspiration *= 0.2 + 0.02*noise.simplex1(this.totalTime * 1.99);
out += aspiration;
return out;
},
getNoiseModulator : function()
{
var voiced = 0.1+0.2*Math.max(0,Math.sin(Math.PI*2*this.timeInWaveform/this.waveformLength));
//return 0.3;
return this.UITenseness* this.intensity * voiced + (1-this.UITenseness* this.intensity ) * 0.3;
},
finishBlock : function()
{
var vibrato = 0;
vibrato += this.vibratoAmount * Math.sin(2*Math.PI * this.totalTime *this.vibratoFrequency);
vibrato += 0.02 * noise.simplex1(this.totalTime * 4.07);
vibrato += 0.04 * noise.simplex1(this.totalTime * 2.15);
if (autoWobble)
{
vibrato += 0.2 * noise.simplex1(this.totalTime * 0.98);
vibrato += 0.4 * noise.simplex1(this.totalTime * 0.5);
}
if (this.UIFrequency>this.smoothFrequency)
this.smoothFrequency = Math.min(this.smoothFrequency * 1.1, this.UIFrequency);
if (this.UIFrequency<this.smoothFrequency)
this.smoothFrequency = Math.max(this.smoothFrequency / 1.1, this.UIFrequency);
this.oldFrequency = this.newFrequency;
this.newFrequency = this.smoothFrequency * (1+vibrato);
this.oldTenseness = this.newTenseness;
this.newTenseness = this.UITenseness
+ 0.1*noise.simplex1(this.totalTime*0.46)+0.05*noise.simplex1(this.totalTime*0.36);
if (!this.isTouched && alwaysVoice) this.newTenseness += (3-this.UITenseness)*(1-this.intensity);
if (this.isTouched || alwaysVoice) this.intensity += 0.13;
else this.intensity -= 0.05;
this.intensity = Math.clamp(this.intensity, 0, 1);
},
setupWaveform : function(lambda)
{
this.frequency = this.oldFrequency*(1-lambda) + this.newFrequency*lambda;
var tenseness = this.oldTenseness*(1-lambda) + this.newTenseness*lambda;
this.Rd = 3*(1-tenseness);
this.waveformLength = 1.0/this.frequency;
var Rd = this.Rd;
if (Rd<0.5) Rd = 0.5;
if (Rd>2.7) Rd = 2.7;
var output;
// normalized to time = 1, Ee = 1
var Ra = -0.01 + 0.048*Rd;
var Rk = 0.224 + 0.118*Rd;
var Rg = (Rk/4)*(0.5+1.2*Rk)/(0.11*Rd-Ra*(0.5+1.2*Rk));
var Ta = Ra;
var Tp = 1 / (2*Rg);
var Te = Tp + Tp*Rk; //
var epsilon = 1/Ta;
var shift = Math.exp(-epsilon * (1-Te));
var Delta = 1 - shift; //divide by this to scale RHS
var RHSIntegral = (1/epsilon)*(shift - 1) + (1-Te)*shift;
RHSIntegral = RHSIntegral/Delta;
var totalLowerIntegral = - (Te-Tp)/2 + RHSIntegral;
var totalUpperIntegral = -totalLowerIntegral;
var omega = Math.PI/Tp;
var s = Math.sin(omega*Te);
// need E0*e^(alpha*Te)*s = -1 (to meet the return at -1)
// and E0*e^(alpha*Tp/2) * Tp*2/pi = totalUpperIntegral
// (our approximation of the integral up to Tp)
// writing x for e^alpha,
// have E0*x^Te*s = -1 and E0 * x^(Tp/2) * Tp*2/pi = totalUpperIntegral
// dividing the second by the first,
// letting y = x^(Tp/2 - Te),
// y * Tp*2 / (pi*s) = -totalUpperIntegral;
var y = -Math.PI*s*totalUpperIntegral / (Tp*2);
var z = Math.log(y);
var alpha = z/(Tp/2 - Te);
var E0 = -1 / (s*Math.exp(alpha*Te));
this.alpha = alpha;
this.E0 = E0;
this.epsilon = epsilon;
this.shift = shift;
this.Delta = Delta;
this.Te=Te;
this.omega = omega;
},
normalizedLFWaveform: function(t)
{
if (t>this.Te) output = (-Math.exp(-this.epsilon * (t-this.Te)) + this.shift)/this.Delta;
else output = this.E0 * Math.exp(this.alpha*t) * Math.sin(this.omega * t);
return output * this.intensity * this.loudness;
}
}
var Tract =
{
n : 44,
bladeStart : 10,
tipStart : 32,
lipStart : 39,
R : [], //component going right
L : [], //component going left
reflection : [],
junctionOutputR : [],
junctionOutputL : [],
maxAmplitude : [],
diameter : [],
restDiameter : [],
targetDiameter : [],
newDiameter : [],
A : [],
glottalReflection : 0.75,
lipReflection : -0.85,
lastObstruction : -1,
fade : 1.0, //0.9999,
movementSpeed : 15, //cm per second
transients : [],
lipOutput : 0,
noseOutput : 0,
velumTarget : 0.01,
init : function()
{
this.bladeStart = Math.floor(this.bladeStart*this.n/44);
this.tipStart = Math.floor(this.tipStart*this.n/44);
this.lipStart = Math.floor(this.lipStart*this.n/44);
this.diameter = new Float64Array(this.n);
this.restDiameter = new Float64Array(this.n);
this.targetDiameter = new Float64Array(this.n);
this.newDiameter = new Float64Array(this.n);
for (var i=0; i<this.n; i++)
{
var diameter = 0;
if (i<7*this.n/44-0.5) diameter = 0.6;
else if (i<12*this.n/44) diameter = 1.1;
else diameter = 1.5;
this.diameter[i] = this.restDiameter[i] = this.targetDiameter[i] = this.newDiameter[i] = diameter;
}
this.R = new Float64Array(this.n);
this.L = new Float64Array(this.n);
this.reflection = new Float64Array(this.n+1);
this.newReflection = new Float64Array(this.n+1);
this.junctionOutputR = new Float64Array(this.n+1);
this.junctionOutputL = new Float64Array(this.n+1);
this.A =new Float64Array(this.n);
this.maxAmplitude = new Float64Array(this.n);
this.noseLength = Math.floor(28*this.n/44)
this.noseStart = this.n-this.noseLength + 1;
this.noseR = new Float64Array(this.noseLength);
this.noseL = new Float64Array(this.noseLength);
this.noseJunctionOutputR = new Float64Array(this.noseLength+1);
this.noseJunctionOutputL = new Float64Array(this.noseLength+1);
this.noseReflection = new Float64Array(this.noseLength+1);
this.noseDiameter = new Float64Array(this.noseLength);
this.noseA = new Float64Array(this.noseLength);
this.noseMaxAmplitude = new Float64Array(this.noseLength);
for (var i=0; i<this.noseLength; i++)
{
var diameter;
var d = 2*(i/this.noseLength);
if (d<1) diameter = 0.4+1.6*d;
else diameter = 0.5+1.5*(2-d);
diameter = Math.min(diameter, 1.9);
this.noseDiameter[i] = diameter;
}
this.newReflectionLeft = this.newReflectionRight = this.newReflectionNose = 0;
this.calculateReflections();
this.calculateNoseReflections();
this.noseDiameter[0] = this.velumTarget;
},
reshapeTract : function(deltaTime)
{
var amount = deltaTime * this.movementSpeed; ;
var newLastObstruction = -1;
for (var i=0; i<this.n; i++)
{
var diameter = this.diameter[i];
var targetDiameter = this.targetDiameter[i];
if (diameter <= 0) newLastObstruction = i;
var slowReturn;
if (i<this.noseStart) slowReturn = 0.6;
else if (i >= this.tipStart) slowReturn = 1.0;
else slowReturn = 0.6+0.4*(i-this.noseStart)/(this.tipStart-this.noseStart);
this.diameter[i] = Math.moveTowards(diameter, targetDiameter, slowReturn*amount, 2*amount);
}
if (this.lastObstruction>-1 && newLastObstruction == -1 && this.noseA[0]<0.05)
{
this.addTransient(this.lastObstruction);
}
this.lastObstruction = newLastObstruction;
amount = deltaTime * this.movementSpeed;
this.noseDiameter[0] = Math.moveTowards(this.noseDiameter[0], this.velumTarget,
amount*0.25, amount*0.1);
this.noseA[0] = this.noseDiameter[0]*this.noseDiameter[0];
},
calculateReflections : function()
{
for (var i=0; i<this.n; i++)
{
this.A[i] = this.diameter[i]*this.diameter[i]; //ignoring PI etc.
}
for (var i=1; i<this.n; i++)
{
this.reflection[i] = this.newReflection[i];
if (this.A[i] == 0) this.newReflection[i] = 0.999; //to prevent some bad behaviour if 0
else this.newReflection[i] = (this.A[i-1]-this.A[i]) / (this.A[i-1]+this.A[i]);
}
//now at junction with nose
this.reflectionLeft = this.newReflectionLeft;
this.reflectionRight = this.newReflectionRight;
this.reflectionNose = this.newReflectionNose;
var sum = this.A[this.noseStart]+this.A[this.noseStart+1]+this.noseA[0];
this.newReflectionLeft = (2*this.A[this.noseStart]-sum)/sum;
this.newReflectionRight = (2*this.A[this.noseStart+1]-sum)/sum;
this.newReflectionNose = (2*this.noseA[0]-sum)/sum;
},
calculateNoseReflections : function()
{
for (var i=0; i<this.noseLength; i++)
{
this.noseA[i] = this.noseDiameter[i]*this.noseDiameter[i];
}
for (var i=1; i<this.noseLength; i++)
{
this.noseReflection[i] = (this.noseA[i-1]-this.noseA[i]) / (this.noseA[i-1]+this.noseA[i]);
}
},
runStep : function(glottalOutput, turbulenceNoise, lambda)
{
var updateAmplitudes = (Math.random()<0.1);
//mouth
this.processTransients();
this.addTurbulenceNoise(turbulenceNoise);
//this.glottalReflection = -0.8 + 1.6 * Glottis.newTenseness;
this.junctionOutputR[0] = this.L[0] * this.glottalReflection + glottalOutput;
this.junctionOutputL[this.n] = this.R[this.n-1] * this.lipReflection;
for (var i=1; i<this.n; i++)
{
var r = this.reflection[i] * (1-lambda) + this.newReflection[i]*lambda;
var w = r * (this.R[i-1] + this.L[i]);
this.junctionOutputR[i] = this.R[i-1] - w;
this.junctionOutputL[i] = this.L[i] + w;
}
//now at junction with nose
var i = this.noseStart;
var r = this.newReflectionLeft * (1-lambda) + this.reflectionLeft*lambda;
this.junctionOutputL[i] = r*this.R[i-1]+(1+r)*(this.noseL[0]+this.L[i]);
r = this.newReflectionRight * (1-lambda) + this.reflectionRight*lambda;
this.junctionOutputR[i] = r*this.L[i]+(1+r)*(this.R[i-1]+this.noseL[0]);
r = this.newReflectionNose * (1-lambda) + this.reflectionNose*lambda;
this.noseJunctionOutputR[0] = r*this.noseL[0]+(1+r)*(this.L[i]+this.R[i-1]);
for (var i=0; i<this.n; i++)
{
this.R[i] = this.junctionOutputR[i]*0.999;
this.L[i] = this.junctionOutputL[i+1]*0.999;
//this.R[i] = Math.clamp(this.junctionOutputR[i] * this.fade, -1, 1);
//this.L[i] = Math.clamp(this.junctionOutputL[i+1] * this.fade, -1, 1);