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formant.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Vowel Formants</title>
<link href="css/audio.css" rel="stylesheet" />
<style>
.label {
width: 80px;
}
.slider {
width: 400px;
}
#vowel-ipa-display {
width: 60px;
}
#vowel-ex-display {
width: 120px;
}
.hi {
color: white;
font-weight: bold;
}
</style>
</head>
<body>
<div>
<span class="title">Vowel Formants</span>
</div>
<div>
<span class="label">Vowel</span>
<input type="range" id="vowel-slider" class="slider" min="0" max="11" step="0.0275" value="0" />
<span id="vowel-ipa-display" class="label"></span><span id="vowel-ex-display" class="label"></span>
<br/>
<span class="label">Frequency</span>
<input type="range" id="freq-slider" class="slider" min="0" max="400" step="1" value="80" />
<span id="freq-display" class="label"></span>
<br/>
<span class="label">Modulator</span>
<input type="range" id="mod-freq-slider" class="slider" min="0" max="10" step="0.025" value="6" />
<span id="mod-freq-display" class="label"></span>
<br/>
<span class="label">Depth</span>
<input type="range" id="mod-depth-slider" class="slider" min="0" max="8" step="0.02" value="2" />
<span id="mod-depth-display" class="label">0%</span>
</div>
<div>
<input type="button" id="start" value="start" />
<input type="button" id="stop" value="stop" />
</div>
<div>
<canvas id="visualizer" width="1024" height="300"></canvas>
</div>
<div class="nav">
<a href="noise.html">> Noise</a><br/>
<a href="index.html">> Index</a>
</div>
</body>
<script type="text/javascript" src="js/frequency-visualizer.js"></script>
<script type="text/javascript">
(function () {
// Sources
// Formant frequencies: Hillenbrand, Getty, Clark and Wheeler (1994), "Acoustic charcteristics of
// American English Vowels", Journal of the Acoustic Society of America; Table V
// Formant amplitudes: Peterson and Barney (1952), "Control Methods User in a Study of the Vowels",
// Journal of the Acoustic Society of America; Table II; dB converted to gain with
// Math.pow(10, dB / 20)
var vowel = [
{
ipa: 'i',
ex: 'b<span class="hi">ea</span>t',
f: [138, 342, 2322, 3000, 3657],
q: [8, 10, 35, 40, 40],
a: [0.63, 0.63, 0.06, 0.04, 0.04]
},
{
ipa: 'ɪ',
ex: 'b<span class="hi">i</span>t',
f: [135, 427, 2034, 2684, 3618],
q: [8, 10, 35, 40, 40],
a: [0.71, 0.71, 0.07, 0.04, 0.04]
},
{
ipa: 'e',
ex: 'b<span class="hi">a</span>it',
f: [129, 476, 2089, 2691, 3649],
q: [8, 10, 35, 40, 40],
a: [0.79, 0.79, 0.10, 0.06, 0.06]
},
{
ipa: 'ɛ',
ex: 'b<span class="hi">e</span>t',
f: [127, 580, 1799, 2605, 3677],
q: [8, 10, 35, 40, 40],
a: [0.79, 0.79, 0.14, 0.06, 0.06]
},
{
ipa: 'æ',
ex: 'b<span class="hi">a</span>t',
f: [123, 588, 1952, 2601, 3624],
q: [8, 10, 35, 40, 40],
a: [0.89, 0.89, 0.25, 0.08, 0.08]
},
{
ipa: 'ɑ',
ex: 'p<span class="hi">a</span>r',
f: [123, 768, 1333, 2522, 3687],
q: [8, 10, 35, 40, 40],
a: [0.89, 0.89, 0.56, 0.04, 0.04]
},
{
ipa: 'ɔ',
ex: 'b<span class="hi">o</span>t',
f: [121, 652, 997, 2538, 3486],
q: [8, 10, 35, 40, 40],
a: [1, 1, 0.45, 0.02, 0.02]
},
{
ipa: 'o',
ex: 'b<span class="hi">o</span>at',
f: [129, 497, 910, 2459, 3384],
q: [8, 10, 35, 40, 40],
a: [0.89, 0.89, 0.32, 0.02, 0.02]
},
{
ipa: 'u',
ex: 'b<span class="hi">oo</span>t',
f: [143, 378, 997, 2343, 3357],
q: [8, 10, 35, 40, 40],
a: [0.71, 0.71, 0.11, 0.01, 0.01]
},
{
ipa: 'ʊ',
ex: 'p<span class="hi">u</span>t',
f: [133, 469, 1122, 2434, 3400],
q: [8, 10, 35, 40, 40],
a: [0.89, 0.89, 0.25, 0.02, 0.02]
},
{
ipa: 'ʌ',
ex: 'b<span class="hi">u</span>t',
f: [133, 623, 1200, 2550, 3557],
q: [8, 10, 35, 40, 40],
a: [0.89, 0.89, 0.32, 0.04, 0.04]
},
{
ipa: 'ɚ',
ex: 'b<span class="hi">ir</span>d',
f: [130, 474, 1379, 1710, 3334],
q: [8, 10, 35, 40, 40],
a: [0.56, 0.56, 0.18, 0.10, 0.10]
}
];
var context = new AudioContext();
var visualizer = new App.FrequencyVisualizer(context, document.getElementById('visualizer'));
var oscNode, masterGainNode, masterFilterNode, modOscNode, modGainNode, filterNodes = [], gainNodes = [];
var formant, frequency, modFrequency, modDepth;
var vowelIpaDisplay = document.getElementById('vowel-ipa-display');
var vowelExDisplay = document.getElementById('vowel-ex-display');
var vowelSlider = document.getElementById('vowel-slider');
vowelSlider.addEventListener('input', updateVowel);
var freqDisplay = document.getElementById('freq-display');
var freqSlider = document.getElementById('freq-slider');
freqSlider.addEventListener('input', updateFrequency);
var modFreqDisplay = document.getElementById('mod-freq-display');
var modFreqSlider = document.getElementById('mod-freq-slider');
modFreqSlider.addEventListener('input', updateModulator);
var modDepthDisplay = document.getElementById('mod-depth-display');
var modDepthSlider = document.getElementById('mod-depth-slider');
modDepthSlider.addEventListener('input', updateDepth);
document.getElementById('start').addEventListener('click', start);
document.getElementById('stop').addEventListener('click', stop);
function getFrequency(slider) {
return Math.min(Math.round((Math.pow(2, slider.value / 40)) * 20), 20000);
}
function getIntermediate(prop, idx) {
var i = Math.floor(vowelSlider.value);
var d = vowelSlider.value - i;
var dx = (vowel[i + 1][prop][idx] - vowel[i][prop][idx]) * d;
return vowel[i][prop][idx] + dx;
}
function start() {
if (!oscNode) {
oscNode = context.createOscillator();
oscNode.frequency.value = frequency;
oscNode.type = 'sawtooth';
//oscNode.setPeriodicWave(periodicWave);
modOscNode = context.createOscillator();
modOscNode.frequency.value = parseFloat(modFreqSlider.value);
modGainNode = context.createGain();
modGainNode.gain.value = frequency * parseFloat(modDepthSlider.value) * 0.01
modOscNode.connect(modGainNode);
modGainNode.connect(oscNode.frequency);
masterFilterNode = context.createBiquadFilter();
masterFilterNode.frequency.value = 5000;
masterFilterNode.type = 'lowpass';
oscNode.connect(masterFilterNode);
masterGainNode = context.createGain();
masterGainNode.gain.value = 0;
for (var i = 0; i <= 4; i++) {
filterNodes[i] = context.createBiquadFilter();
filterNodes[i].type = 'bandpass';
masterFilterNode.connect(filterNodes[i]);
gainNodes[i] = context.createGain();
filterNodes[i].connect(gainNodes[i]);
gainNodes[i].connect(masterGainNode);
}
updateVowel();
masterGainNode.connect(context.destination);
visualizer.acceptConnection(masterGainNode);
oscNode.start();
modOscNode.start();
masterGainNode.gain.setValueAtTime(0, context.currentTime);
masterGainNode.gain.linearRampToValueAtTime(0.5, context.currentTime + 0.02);
}
}
function stop() {
if (oscNode) {
masterGainNode.gain.setValueAtTime(masterGainNode.gain.value, context.currentTime);
masterGainNode.gain.linearRampToValueAtTime(0, context.currentTime + 0.02);
setTimeout(function () {
oscNode.stop();
masterGainNode.disconnect(context.destination);
visualizer.releaseConnection(masterGainNode);
oscNode = undefined;
modOscNode = undefined;
modGainNode = undefined;
masterFilterNode = undefined;
filterNodes = [];
gainNodes = [];
masterGainNode = undefined;
}, 40);
}
}
function updateDepth() {
var modDepth = parseFloat(modDepthSlider.value);
modDepthDisplay.textContent = Math.round(modDepth) + '%';
if (modGainNode) {
modGainNode.gain.value = frequency * modDepth * 0.01;
}
}
function updateFrequency() {
frequency = getFrequency(freqSlider);
freqDisplay.textContent = frequency + ' hz';
if (oscNode) {
oscNode.frequency.value = frequency;
}
}
function updateModulator() {
modFrequency = parseFloat(modFreqSlider.value);
modFreqDisplay.textContent = Math.round(modFrequency) + ' hz';
if (modOscNode) {
modOscNode.frequency.value = modFrequency;
}
}
function updateVowel() {
var v = vowel[Math.round(vowelSlider.value)];
vowelIpaDisplay.textContent = 'IPA: ' + v.ipa;
vowelExDisplay.innerHTML = 'Example: ' + v.ex;
if (filterNodes.length) {
for (var i = 0; i <= 4; i++) {
filterNodes[i].frequency.value = getIntermediate('f', i);
filterNodes[i].Q.value = getIntermediate('q', i);
gainNodes[i].gain.value = getIntermediate('a', i);
}
}
}
updateVowel();
updateFrequency();
updateModulator();
updateDepth();
})();
</script>
</html>