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Simple HTML Tone Generator
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-type" content="text/html; charset=utf-8"> | |
| <title>Tone Generator</title> | |
| <script> | |
| var context = null; | |
| var usingWebAudio = true; | |
| if (typeof AudioContext !== 'undefined') { | |
| context = new AudioContext(); | |
| } else if (typeof webkitAudioContext !== 'undefined') { | |
| context = new webkitAudioContext(); | |
| } else { | |
| usingWebAudio = false; | |
| } | |
| var playing = false; | |
| var osc = null; | |
| var freq = 440; | |
| var STEP_CONSTANT = Math.pow(2.0, 1.0/12.0); | |
| function toggle() { | |
| var button = document.getElementById("toggle"); | |
| if (playing && osc) { | |
| playing = false; | |
| osc.stop(0); | |
| button.value = "Play"; | |
| } else { | |
| playing = true; | |
| osc = context.createOscillator(); | |
| osc.connect(context.destination); | |
| osc.frequency.value = freq; | |
| osc.start(0); | |
| button.value = "Stop"; | |
| } | |
| } | |
| function updateFreq(newFreq) { | |
| freq = newFreq; | |
| if (osc) { | |
| osc.frequency.value = freq; | |
| } | |
| var text = document.getElementById("freqText").value = freq; | |
| var range = document.getElementById("freqRange").value = freq; | |
| } | |
| window.onload = function() { | |
| if (!usingWebAudio) { | |
| document.getElementById("audioControls").innerHTML = "<p>Web audio required.</p>" | |
| } | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <div id="audioControls"> | |
| <input id="freqText" type="text" value="440" onchange="updateFreq(this.value)"/> | |
| <input type="button" value="-1 octave" onclick="updateFreq(freq / 2)"/> | |
| <input type="button" value="-1 half-step" onclick="updateFreq(freq / STEP_CONSTANT)"/> | |
| <input type="button" value="+1 half-step" onclick="updateFreq(freq * STEP_CONSTANT)"/> | |
| <input type="button" value="+1 octave" onclick="updateFreq(freq * 2)"/> | |
| <br> | |
| <input id="freqRange" type="range" min="0" max="1760" value="440" oninput="updateFreq(this.value)"/> | |
| <br> | |
| <input id="toggle" type="button" value="Play" onclick="toggle()"/> | |
| </div> | |
| </body> | |
| </html> |
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cool sound generator