2015-06-27 21:25:01 +00:00
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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2019-01-09 01:21:29 +00:00
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<title>Signal Ramping</title>
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2015-06-27 21:25:01 +00:00
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2019-01-09 01:21:29 +00:00
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<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
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<link rel="icon" type="image/png" sizes="174x174" href="./favicon.png">
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2015-06-27 21:25:01 +00:00
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2020-07-18 00:58:09 +00:00
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<script src="https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/2.4.3/webcomponents-bundle.js"></script>
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2020-07-18 00:36:42 +00:00
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<link href="https://fonts.googleapis.com/css?family=Material+Icons&display=block" rel="stylesheet"/>
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2017-03-18 16:35:37 +00:00
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<script src="../build/Tone.js"></script>
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2020-07-18 00:58:09 +00:00
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<script src="./js/tone-ui.js"></script>
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<script src="./js/components.js"></script>
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2015-06-27 21:25:01 +00:00
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</head>
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<body>
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2019-01-09 01:21:29 +00:00
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<style>
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tone-slider {
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width: 100%;
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margin-top: 10px;
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2015-06-27 21:25:01 +00:00
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}
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</style>
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2020-07-18 00:36:42 +00:00
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<tone-example label="rampTo">
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<div slot="explanation">
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2017-08-31 16:41:54 +00:00
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Working with signals is different than working with numbers or strings:
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2015-06-27 22:02:55 +00:00
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Signals are values which are updated at audio rate,
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2015-06-27 21:25:01 +00:00
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which allows for sample-accurate scheduling and ramping. <code>.rampTo(value, rampTime)</code>
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2017-08-31 16:41:54 +00:00
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smoothly changes the signal from the current value to the target value over the duration of the rampTime.
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This example uses <code>.rampTo</code> in to smooth out changes in volume and frequency.
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2020-07-18 00:36:42 +00:00
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</div>
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2015-06-27 21:25:01 +00:00
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2020-07-18 00:36:42 +00:00
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<div id="content">
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2019-01-09 01:21:29 +00:00
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<tone-play-toggle></tone-play-toggle>
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2020-07-18 00:36:42 +00:00
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<tone-slider label="harmonicity" min="0.5" max="2" value="1"></tone-slider>
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</div>
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2019-01-09 01:21:29 +00:00
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</tone-example>
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2015-06-27 21:25:01 +00:00
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2019-01-09 01:21:29 +00:00
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<script type="text/javascript">
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2020-07-19 00:20:19 +00:00
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const oscillators = [];
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2015-06-27 21:25:01 +00:00
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2020-07-19 00:20:19 +00:00
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const bassFreq = 32;
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2015-06-27 21:25:01 +00:00
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2020-07-19 00:20:19 +00:00
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for (let i = 0; i < 8; i++) {
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2017-08-31 16:41:54 +00:00
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oscillators.push(new Tone.Oscillator({
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2020-07-19 00:20:19 +00:00
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frequency: bassFreq * i,
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type: "sawtooth4",
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volume: -Infinity,
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detune: Math.random() * 30 - 15,
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2020-07-18 00:36:42 +00:00
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}).toDestination());
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2015-06-27 21:25:01 +00:00
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}
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2020-07-19 00:20:19 +00:00
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// bind the interface
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2020-07-18 00:36:42 +00:00
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document.querySelector("tone-play-toggle").addEventListener("start", e => {
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2019-01-09 01:21:29 +00:00
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oscillators.forEach(o => {
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2020-07-18 00:36:42 +00:00
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o.start();
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o.volume.rampTo(-20, 1);
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2019-01-09 01:21:29 +00:00
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});
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2017-08-31 16:41:54 +00:00
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});
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2020-07-18 00:36:42 +00:00
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document.querySelector("tone-play-toggle").addEventListener("stop", e => {
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oscillators.forEach(o => {
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o.stop("+1.2");
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o.volume.rampTo(-Infinity, 1);
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});
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2020-07-19 00:20:19 +00:00
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});
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2017-08-31 16:41:54 +00:00
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2020-07-18 00:36:42 +00:00
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document.querySelector("tone-slider").addEventListener("input", e => {
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2019-01-09 01:21:29 +00:00
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oscillators.forEach((osc, i) => {
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2020-07-18 00:36:42 +00:00
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osc.frequency.rampTo(bassFreq * i * parseFloat(e.target.value), 0.4);
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2019-01-09 01:21:29 +00:00
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});
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2017-08-31 16:41:54 +00:00
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});
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2015-06-27 21:25:01 +00:00
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</script>
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</body>
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2017-03-18 16:35:37 +00:00
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</html>
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