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AnalyserNode.html
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<!doctype html><html lang="en-US" prefix="og: https://ogp.me/ns#"><head><meta charset="utf-8"/><meta name="viewport" content="width=device-width,initial-scale=1"/><link rel="icon" href="/favicon-48x48.cbbd161b.png"/><link rel="apple-touch-icon" href="/apple-touch-icon.6803c6f0.png"/><meta name="theme-color" content="#ffffff"/><link rel="manifest" href="/manifest.56b1cedc.json"/><link rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="MDN Web Docs"/><title>AnalyserNode - Web APIs | MDN</title><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/es/docs/Web/API/AnalyserNode" hreflang="es"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/fr/docs/Web/API/AnalyserNode" hreflang="fr"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/ja/docs/Web/API/AnalyserNode" hreflang="ja"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/ko/docs/Web/API/AnalyserNode" hreflang="ko"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/ru/docs/Web/API/AnalyserNode" hreflang="ru"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/zh-CN/docs/Web/API/AnalyserNode" hreflang="zh"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/zh-TW/docs/Web/API/AnalyserNode" hreflang="zh-Hant"/><link rel="alternate" title="AnalyserNode" href="https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode" hreflang="en"/><link rel="alternate" type="application/rss+xml" title="MDN Blog RSS Feed" href="/en-US/blog/rss.xml" hreflang="en" /><meta name="robots" content="index, follow"><meta name="description" content="The AnalyserNode interface represents a node able to provide real-time frequency and time-domain analysis information. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations."/><meta property="og:url" content="https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode"/><meta property="og:title" content="AnalyserNode - Web APIs | MDN"/><meta property="og:locale" content="en-US"/><meta property="og:description" content="The AnalyserNode interface represents a node able to provide real-time frequency and time-domain analysis information. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations."/><meta property="og:image" content="https://developer.mozilla.org/mdn-social-share.cd6c4a5a.png"/><meta name="twitter:card" content="summary_large_image"/><meta name="twitter:creator" content="MozDevNet"/><link rel="canonical" href="https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode"/><style media="print">.article-actions-container,.document-toc-container,.language-menu,.main-menu-toggle,.mdn-cta-container,.on-github,.page-footer,.place,.sidebar,.top-banner,.top-navigation-main,ul.prev-next{display:none!important}.main-page-content,.main-page-content pre{padding:2px}.main-page-content pre{border-left-width:2px}</style><script src="/static/js/ga.js" defer=""></script><script defer="defer" src="/static/js/main.8f7f874e.js"></script><link href="/static/css/main.76ba4ef8.css" rel="stylesheet"></head><body><script>document.body.addEventListener("load",(t=>{t.target.classList.contains("interactive")&&t.target.setAttribute("data-readystate","complete")}),{capture:!0});const c={light:"#ffffff",dark:"#1b1b1b"};if(window&&document.documentElement)try{const t=window.localStorage.getItem("theme");t&&(document.documentElement.className=t,document.documentElement.style.backgroundColor=c[t])}catch(t){console.warn("Unable to read theme from localStorage",t)}</script><div id="root"><ul id="nav-access" class="a11y-nav"><li><a id="skip-main" href="#content">Skip to main content</a></li><li><a id="skip-search" href="#top-nav-search-input">Skip to search</a></li><li><a id="skip-select-language" href="#languages-switcher-button">Skip to select language</a></li></ul><div class="page-wrapper category-api document-page"><div class="top-banner loading"><section class="place top container"></section></div><div class="main-document-header-container"><header class="top-navigation
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class="article-actions-entries"><li class="article-actions-entry"><div class="languages-switcher-menu open-on-focus-within"><button id="languages-switcher-button" type="button" class="button action small has-icon languages-switcher-menu" aria-haspopup="menu"><span class="button-wrap"><span class="icon icon-language "></span>English (US)</span></button></div></li></ul></div></div></div></div><div class="main-wrapper"><div class="sidebar-container"><aside id="sidebar-quicklinks" class="sidebar" data-macro="APIRef"><button type="button" class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#constructor">Constructor</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instance_properties">Instance properties</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instance_methods">Instance methods</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></div><div class="sidebar-body"><ol><li><strong><a href="/en-US/docs/Web/API/Web_Audio_API">Web Audio API</a></strong></li><li><strong><em><a href="/en-US/docs/Web/API/AnalyserNode" aria-current="page"><code>AnalyserNode</code></a></em></strong></li><li class="toggle"><details open=""><summary>Constructor</summary><ol><li><a href="/en-US/docs/Web/API/AnalyserNode/AnalyserNode"><code>AnalyserNode()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Instance properties</summary><ol><li><a href="/en-US/docs/Web/API/AnalyserNode/fftSize"><code>fftSize</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/frequencyBinCount"><code>frequencyBinCount</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/maxDecibels"><code>maxDecibels</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/minDecibels"><code>minDecibels</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/smoothingTimeConstant"><code>smoothingTimeConstant</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/API/AnalyserNode/getByteFrequencyData"><code>getByteFrequencyData()</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/getByteTimeDomainData"><code>getByteTimeDomainData()</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/getFloatFrequencyData"><code>getFloatFrequencyData()</code></a></li><li><a href="/en-US/docs/Web/API/AnalyserNode/getFloatTimeDomainData"><code>getFloatTimeDomainData()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Inheritance:</summary><ol><li><a href="/en-US/docs/Web/API/AudioNode"><code>AudioNode</code></a></li><li><a href="/en-US/docs/Web/API/EventTarget"><code>EventTarget</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Related pages for Web Audio API</summary><ol><li><a href="/en-US/docs/Web/API/AudioBuffer"><code>AudioBuffer</code></a></li><li><a href="/en-US/docs/Web/API/AudioBufferSourceNode"><code>AudioBufferSourceNode</code></a></li><li><a href="/en-US/docs/Web/API/AudioContext"><code>AudioContext</code></a></li><li><a href="/en-US/docs/Web/API/AudioDestinationNode"><code>AudioDestinationNode</code></a></li><li><a href="/en-US/docs/Web/API/AudioListener"><code>AudioListener</code></a></li><li><a href="/en-US/docs/Web/API/AudioNode"><code>AudioNode</code></a></li><li><a href="/en-US/docs/Web/API/AudioParam"><code>AudioParam</code></a></li><li><a href="/en-US/docs/Web/API/AudioProcessingEvent"><code>AudioProcessingEvent</code></a></li><li><a href="/en-US/docs/Web/API/AudioScheduledSourceNode"><code>AudioScheduledSourceNode</code></a></li><li><a href="/en-US/docs/Web/API/AudioSinkInfo"><code>AudioSinkInfo</code></a></li><li><a href="/en-US/docs/Web/API/AudioWorklet"><code>AudioWorklet</code></a></li><li><a href="/en-US/docs/Web/API/AudioWorkletGlobalScope"><code>AudioWorkletGlobalScope</code></a></li><li><a href="/en-US/docs/Web/API/AudioWorkletNode"><code>AudioWorkletNode</code></a></li><li><a href="/en-US/docs/Web/API/AudioWorkletProcessor"><code>AudioWorkletProcessor</code></a></li><li><a href="/en-US/docs/Web/API/BaseAudioContext"><code>BaseAudioContext</code></a></li><li><a href="/en-US/docs/Web/API/BiquadFilterNode"><code>BiquadFilterNode</code></a></li><li><a href="/en-US/docs/Web/API/ChannelMergerNode"><code>ChannelMergerNode</code></a></li><li><a href="/en-US/docs/Web/API/ChannelSplitterNode"><code>ChannelSplitterNode</code></a></li><li><a href="/en-US/docs/Web/API/ConstantSourceNode"><code>ConstantSourceNode</code></a></li><li><a href="/en-US/docs/Web/API/ConvolverNode"><code>ConvolverNode</code></a></li><li><a href="/en-US/docs/Web/API/DelayNode"><code>DelayNode</code></a></li><li><a href="/en-US/docs/Web/API/DynamicsCompressorNode"><code>DynamicsCompressorNode</code></a></li><li><a href="/en-US/docs/Web/API/GainNode"><code>GainNode</code></a></li><li><a href="/en-US/docs/Web/API/IIRFilterNode"><code>IIRFilterNode</code></a></li><li><a href="/en-US/docs/Web/API/MediaElementAudioSourceNode"><code>MediaElementAudioSourceNode</code></a></li><li><a href="/en-US/docs/Web/API/MediaStreamAudioDestinationNode"><code>MediaStreamAudioDestinationNode</code></a></li><li><a href="/en-US/docs/Web/API/MediaStreamAudioSourceNode"><code>MediaStreamAudioSourceNode</code></a></li><li><a href="/en-US/docs/Web/API/OfflineAudioCompletionEvent"><code>OfflineAudioCompletionEvent</code></a></li><li><a href="/en-US/docs/Web/API/OfflineAudioContext"><code>OfflineAudioContext</code></a></li><li><a href="/en-US/docs/Web/API/OscillatorNode"><code>OscillatorNode</code></a></li><li><a href="/en-US/docs/Web/API/PannerNode"><code>PannerNode</code></a></li><li><a href="/en-US/docs/Web/API/PeriodicWave"><code>PeriodicWave</code></a></li><li><a href="/en-US/docs/Web/API/StereoPannerNode"><code>StereoPannerNode</code></a></li><li><a href="/en-US/docs/Web/API/WaveShaperNode"><code>WaveShaperNode</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#constructor">Constructor</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instance_properties">Instance properties</a></li><li class="document-toc-item "><a class="document-toc-link" href="#instance_methods">Instance methods</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="en-US"><header><h1>AnalyserNode</h1></header><div class="section-content"><p>The <strong><code>AnalyserNode</code></strong> interface represents a node able to provide real-time frequency and time-domain analysis information. It is an <a href="/en-US/docs/Web/API/AudioNode"><code>AudioNode</code></a> that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations.</p>
<p>An <code>AnalyserNode</code> has exactly one input and one output. The node works even if the output is not connected.</p>
<p>
<img src="/en-US/docs/Web/API/AnalyserNode/fttaudiodata_en.svg" alt="Without modifying the audio stream, the node allows to get the frequency and time-domain data associated to it, using a FFT." width="693" height="206" loading="lazy">
</p><svg viewBox="-1 -1 650 42" preserveAspectRatio="xMinYMin meet">
<a style="text-decoration: none;" xlink:href="/en-US/docs/Web/API/EventTarget">
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<text x="44" y="16" font-size="10px" fill="#4D4E53" text-anchor="middle">
EventTarget
</text>
</a>
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<polyline points="88,14 98,9 98,19 88,14" stroke="#D4DDE4" fill="#fff"></polyline>
<a style="text-decoration: none;" xlink:href="/en-US/docs/Web/API/AudioNode">
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AudioNode
</text>
</a>
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<a style="text-decoration: none;" xlink:href="/en-US/docs/Web/API/AnalyserNode" aria-current="page">
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AnalyserNode
</text>
</a></svg>
<figure class="table-container"><table class="properties">
<tbody>
<tr>
<th scope="row">Number of inputs</th>
<td><code>1</code></td>
</tr>
<tr>
<th scope="row">Number of outputs</th>
<td><code>1</code> (but may be left unconnected)</td>
</tr>
<tr>
<th scope="row">Channel count mode</th>
<td><code>"max"</code></td>
</tr>
<tr>
<th scope="row">Channel count</th>
<td><code>2</code></td>
</tr>
<tr>
<th scope="row">Channel interpretation</th>
<td><code>"speakers"</code></td>
</tr>
</tbody>
</table></figure></div><section aria-labelledby="constructor"><h2 id="constructor"><a href="#constructor">Constructor</a></h2><div class="section-content"><dl>
<dt id="analysernode"><a href="/en-US/docs/Web/API/AnalyserNode/AnalyserNode" title="AnalyserNode()"><code>AnalyserNode()</code></a></dt>
<dd>
<p>Creates a new instance of an <code>AnalyserNode</code> object.</p>
</dd>
</dl></div></section><section aria-labelledby="instance_properties"><h2 id="instance_properties"><a href="#instance_properties">Instance properties</a></h2><div class="section-content"><p><em>Inherits properties from its parent, <a href="/en-US/docs/Web/API/AudioNode"><code>AudioNode</code></a></em>.</p>
<dl>
<dt id="analysernode.fftsize"><a href="/en-US/docs/Web/API/AnalyserNode/fftSize"><code>AnalyserNode.fftSize</code></a></dt>
<dd>
<p>An unsigned long value representing the size of the FFT (<a href="https://en.wikipedia.org/wiki/Fast_Fourier_transform" class="external" target="_blank">Fast Fourier Transform</a>) to be used to determine the frequency domain.</p>
</dd>
<dt id="analysernode.frequencybincount"><a href="/en-US/docs/Web/API/AnalyserNode/frequencyBinCount"><code>AnalyserNode.frequencyBinCount</code></a> <span title="This value may not be changed." class="badge inline readonly">Read only </span></dt>
<dd>
<p>An unsigned long value half that of the FFT size. This generally equates to the number of data values you will have to play with for the visualization.</p>
</dd>
<dt id="analysernode.mindecibels"><a href="/en-US/docs/Web/API/AnalyserNode/minDecibels"><code>AnalyserNode.minDecibels</code></a></dt>
<dd>
<p>A double value representing the minimum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the minimum value for the range of results when using <code>getByteFrequencyData()</code>.</p>
</dd>
<dt id="analysernode.maxdecibels"><a href="/en-US/docs/Web/API/AnalyserNode/maxDecibels"><code>AnalyserNode.maxDecibels</code></a></dt>
<dd>
<p>A double value representing the maximum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the maximum value for the range of results when using <code>getByteFrequencyData()</code>.</p>
</dd>
<dt id="analysernode.smoothingtimeconstant"><a href="/en-US/docs/Web/API/AnalyserNode/smoothingTimeConstant"><code>AnalyserNode.smoothingTimeConstant</code></a></dt>
<dd>
<p>A double value representing the averaging constant with the last analysis frame — basically, it makes the transition between values over time smoother.</p>
</dd>
</dl></div></section><section aria-labelledby="instance_methods"><h2 id="instance_methods"><a href="#instance_methods">Instance methods</a></h2><div class="section-content"><p><em>Inherits methods from its parent, <a href="/en-US/docs/Web/API/AudioNode"><code>AudioNode</code></a></em>.</p>
<dl>
<dt id="analysernode.getfloatfrequencydata"><a href="/en-US/docs/Web/API/AnalyserNode/getFloatFrequencyData"><code>AnalyserNode.getFloatFrequencyData()</code></a></dt>
<dd>
<p>Copies the current frequency data into a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array"><code>Float32Array</code></a> array passed into it.</p>
</dd>
<dt id="analysernode.getbytefrequencydata"><a href="/en-US/docs/Web/API/AnalyserNode/getByteFrequencyData"><code>AnalyserNode.getByteFrequencyData()</code></a></dt>
<dd>
<p>Copies the current frequency data into a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array"><code>Uint8Array</code></a> (unsigned byte array) passed into it.</p>
</dd>
<dt id="analysernode.getfloattimedomaindata"><a href="/en-US/docs/Web/API/AnalyserNode/getFloatTimeDomainData"><code>AnalyserNode.getFloatTimeDomainData()</code></a></dt>
<dd>
<p>Copies the current waveform, or time-domain, data into a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array"><code>Float32Array</code></a> array passed into it.</p>
</dd>
<dt id="analysernode.getbytetimedomaindata"><a href="/en-US/docs/Web/API/AnalyserNode/getByteTimeDomainData"><code>AnalyserNode.getByteTimeDomainData()</code></a></dt>
<dd>
<p>Copies the current waveform, or time-domain, data into a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array"><code>Uint8Array</code></a> (unsigned byte array) passed into it.</p>
</dd>
</dl></div></section><section aria-labelledby="examples"><h2 id="examples"><a href="#examples">Examples</a></h2><div class="section-content"><div class="notecard note" id="sect1">
<p><strong>Note:</strong> See the guide <a href="/en-US/docs/Web/API/Web_Audio_API/Visualizations_with_Web_Audio_API">Visualizations with Web Audio API</a> for more information on creating audio visualizations.</p>
</div></div></section><section aria-labelledby="basic_usage"><h3 id="basic_usage"><a href="#basic_usage">Basic usage</a></h3><div class="section-content"><p>
The following example shows basic usage of an <a href="/en-US/docs/Web/API/AudioContext"><code>AudioContext</code></a> to create an <code>AnalyserNode</code>, then <a href="/en-US/docs/Web/API/window/requestAnimationFrame" title="requestAnimationFrame"><code>requestAnimationFrame</code></a> and <a href="/en-US/docs/Web/HTML/Element/canvas"><code><canvas></code></a> to collect time domain data repeatedly and draw an "oscilloscope style" output of the current audio input.
For more complete applied examples/information, check out our <a href="https://mdn.github.io/webaudio-examples/voice-change-o-matic/" class="external" target="_blank">Voice-change-O-matic</a> demo (see <a href="https://github.com/mdn/webaudio-examples/tree/main/voice-change-o-matic/scripts/app.js#L108-L193" class="external" target="_blank">app.js lines 108-193</a> for relevant code).
</p>
<div class="code-example"><p class="example-header"><span class="language-name">js</span></p><pre class="brush: js notranslate" data-signature="lCfKfan8uYSgq4FewHNLhbbc8J2YLFZPUhjDVdZkXJo="><code><span class="token keyword">const</span> audioCtx <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token punctuation">(</span>window<span class="token punctuation">.</span>AudioContext <span class="token operator">||</span> window<span class="token punctuation">.</span>webkitAudioContext<span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// …</span>
<span class="token keyword">const</span> analyser <span class="token operator">=</span> audioCtx<span class="token punctuation">.</span><span class="token function">createAnalyser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
analyser<span class="token punctuation">.</span>fftSize <span class="token operator">=</span> <span class="token number">2048</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> bufferLength <span class="token operator">=</span> analyser<span class="token punctuation">.</span>frequencyBinCount<span class="token punctuation">;</span>
<span class="token keyword">const</span> dataArray <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Uint8Array</span><span class="token punctuation">(</span>bufferLength<span class="token punctuation">)</span><span class="token punctuation">;</span>
analyser<span class="token punctuation">.</span><span class="token function">getByteTimeDomainData</span><span class="token punctuation">(</span>dataArray<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Connect the source to be analysed</span>
source<span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span>analyser<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Get a canvas defined with ID "oscilloscope"</span>
<span class="token keyword">const</span> canvas <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">"oscilloscope"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> canvasCtx <span class="token operator">=</span> canvas<span class="token punctuation">.</span><span class="token function">getContext</span><span class="token punctuation">(</span><span class="token string">"2d"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// draw an oscilloscope of the current audio source</span>
<span class="token keyword">function</span> <span class="token function">draw</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">requestAnimationFrame</span><span class="token punctuation">(</span>draw<span class="token punctuation">)</span><span class="token punctuation">;</span>
analyser<span class="token punctuation">.</span><span class="token function">getByteTimeDomainData</span><span class="token punctuation">(</span>dataArray<span class="token punctuation">)</span><span class="token punctuation">;</span>
canvasCtx<span class="token punctuation">.</span>fillStyle <span class="token operator">=</span> <span class="token string">"rgb(200, 200, 200)"</span><span class="token punctuation">;</span>
canvasCtx<span class="token punctuation">.</span><span class="token function">fillRect</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> canvas<span class="token punctuation">.</span>width<span class="token punctuation">,</span> canvas<span class="token punctuation">.</span>height<span class="token punctuation">)</span><span class="token punctuation">;</span>
canvasCtx<span class="token punctuation">.</span>lineWidth <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
canvasCtx<span class="token punctuation">.</span>strokeStyle <span class="token operator">=</span> <span class="token string">"rgb(0, 0, 0)"</span><span class="token punctuation">;</span>
canvasCtx<span class="token punctuation">.</span><span class="token function">beginPath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> sliceWidth <span class="token operator">=</span> <span class="token punctuation">(</span>canvas<span class="token punctuation">.</span>width <span class="token operator">*</span> <span class="token number">1.0</span><span class="token punctuation">)</span> <span class="token operator">/</span> bufferLength<span class="token punctuation">;</span>
<span class="token keyword">let</span> x <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> bufferLength<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> v <span class="token operator">=</span> dataArray<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">/</span> <span class="token number">128.0</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> y <span class="token operator">=</span> <span class="token punctuation">(</span>v <span class="token operator">*</span> canvas<span class="token punctuation">.</span>height<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
canvasCtx<span class="token punctuation">.</span><span class="token function">moveTo</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
canvasCtx<span class="token punctuation">.</span><span class="token function">lineTo</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
x <span class="token operator">+=</span> sliceWidth<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
canvasCtx<span class="token punctuation">.</span><span class="token function">lineTo</span><span class="token punctuation">(</span>canvas<span class="token punctuation">.</span>width<span class="token punctuation">,</span> canvas<span class="token punctuation">.</span>height <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
canvasCtx<span class="token punctuation">.</span><span class="token function">stroke</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">draw</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></div></section><h2 id="specifications"><a href="#specifications">Specifications</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://webaudio.github.io/web-audio-api/#AnalyserNode">Web Audio API<!-- --> <br/><small># <!-- -->AnalyserNode</small></a></td></tr></tbody></table><h2 id="browser_compatibility"><a href="#browser_compatibility">Browser compatibility</a></h2><p>BCD tables only load in the browser<noscript> <!-- -->with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="see_also"><h2 id="see_also"><a href="#see_also">See also</a></h2><div class="section-content"><ul>
<li><a href="/en-US/docs/Web/API/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
</ul></div></section><aside class="metadata"><div class="metadata-content-container"><div id="on-github" class="on-github"><h3>Found a content problem with this page?</h3><ul><li><a href="https://github.com/mdn/content/edit/main/files/en-us/web/api/analysernode/index.md" title="This will take you to GitHub, where you'll need to sign in first." target="_blank" rel="noopener noreferrer">Edit the page on GitHub</a>.</li><li><a 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Content available under<!-- --> <a href="/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"doc":{"isMarkdown":true,"isTranslated":false,"isActive":true,"flaws":{},"title":"AnalyserNode","mdn_url":"/en-US/docs/Web/API/AnalyserNode","locale":"en-US","native":"English (US)","browserCompat":["api.AnalyserNode"],"sidebarHTML":"<ol><li><strong><a href=\"/en-US/docs/Web/API/Web_Audio_API\">Web Audio API</a></strong></li><li><strong><em><a href=\"/en-US/docs/Web/API/AnalyserNode\" aria-current=\"page\"><code>AnalyserNode</code></a></em></strong></li><li class=\"toggle\"><details open=\"\"><summary>Constructor</summary><ol><li><a href=\"/en-US/docs/Web/API/AnalyserNode/AnalyserNode\"><code>AnalyserNode()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instance properties</summary><ol><li><a href=\"/en-US/docs/Web/API/AnalyserNode/fftSize\"><code>fftSize</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/frequencyBinCount\"><code>frequencyBinCount</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/maxDecibels\"><code>maxDecibels</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/minDecibels\"><code>minDecibels</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/smoothingTimeConstant\"><code>smoothingTimeConstant</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/API/AnalyserNode/getByteFrequencyData\"><code>getByteFrequencyData()</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/getByteTimeDomainData\"><code>getByteTimeDomainData()</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/getFloatFrequencyData\"><code>getFloatFrequencyData()</code></a></li><li><a href=\"/en-US/docs/Web/API/AnalyserNode/getFloatTimeDomainData\"><code>getFloatTimeDomainData()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Inheritance:</summary><ol><li><a href=\"/en-US/docs/Web/API/AudioNode\"><code>AudioNode</code></a></li><li><a href=\"/en-US/docs/Web/API/EventTarget\"><code>EventTarget</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Related pages for Web Audio API</summary><ol><li><a href=\"/en-US/docs/Web/API/AudioBuffer\"><code>AudioBuffer</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioBufferSourceNode\"><code>AudioBufferSourceNode</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioContext\"><code>AudioContext</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioDestinationNode\"><code>AudioDestinationNode</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioListener\"><code>AudioListener</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioNode\"><code>AudioNode</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioParam\"><code>AudioParam</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioProcessingEvent\"><code>AudioProcessingEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioScheduledSourceNode\"><code>AudioScheduledSourceNode</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioSinkInfo\"><code>AudioSinkInfo</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioWorklet\"><code>AudioWorklet</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioWorkletGlobalScope\"><code>AudioWorkletGlobalScope</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioWorkletNode\"><code>AudioWorkletNode</code></a></li><li><a href=\"/en-US/docs/Web/API/AudioWorkletProcessor\"><code>AudioWorkletProcessor</code></a></li><li><a href=\"/en-US/docs/Web/API/BaseAudioContext\"><code>BaseAudioContext</code></a></li><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode\"><code>BiquadFilterNode</code></a></li><li><a href=\"/en-US/docs/Web/API/ChannelMergerNode\"><code>ChannelMergerNode</code></a></li><li><a href=\"/en-US/docs/Web/API/ChannelSplitterNode\"><code>ChannelSplitterNode</code></a></li><li><a href=\"/en-US/docs/Web/API/ConstantSourceNode\"><code>ConstantSourceNode</code></a></li><li><a href=\"/en-US/docs/Web/API/ConvolverNode\"><code>ConvolverNode</code></a></li><li><a href=\"/en-US/docs/Web/API/DelayNode\"><code>DelayNode</code></a></li><li><a href=\"/en-US/docs/Web/API/DynamicsCompressorNode\"><code>DynamicsCompressorNode</code></a></li><li><a href=\"/en-US/docs/Web/API/GainNode\"><code>GainNode</code></a></li><li><a href=\"/en-US/docs/Web/API/IIRFilterNode\"><code>IIRFilterNode</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaElementAudioSourceNode\"><code>MediaElementAudioSourceNode</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaStreamAudioDestinationNode\"><code>MediaStreamAudioDestinationNode</code></a></li><li><a href=\"/en-US/docs/Web/API/MediaStreamAudioSourceNode\"><code>MediaStreamAudioSourceNode</code></a></li><li><a href=\"/en-US/docs/Web/API/OfflineAudioCompletionEvent\"><code>OfflineAudioCompletionEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/OfflineAudioContext\"><code>OfflineAudioContext</code></a></li><li><a href=\"/en-US/docs/Web/API/OscillatorNode\"><code>OscillatorNode</code></a></li><li><a href=\"/en-US/docs/Web/API/PannerNode\"><code>PannerNode</code></a></li><li><a href=\"/en-US/docs/Web/API/PeriodicWave\"><code>PeriodicWave</code></a></li><li><a href=\"/en-US/docs/Web/API/StereoPannerNode\"><code>StereoPannerNode</code></a></li><li><a href=\"/en-US/docs/Web/API/WaveShaperNode\"><code>WaveShaperNode</code></a></li></ol></details></li></ol>","sidebarMacro":"APIRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>The <strong><code>AnalyserNode</code></strong> interface represents a node able to provide real-time frequency and time-domain analysis information. It is an <a href=\"/en-US/docs/Web/API/AudioNode\"><code>AudioNode</code></a> that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations.</p>\n<p>An <code>AnalyserNode</code> has exactly one input and one output. The node works even if the output is not connected.</p>\n<p>\n <img src=\"/en-US/docs/Web/API/AnalyserNode/fttaudiodata_en.svg\" alt=\"Without modifying the audio stream, the node allows to get the frequency and time-domain data associated to it, using a FFT.\" width=\"693\" height=\"206\" loading=\"lazy\">\n</p><svg viewBox=\"-1 -1 650 42\" preserveAspectRatio=\"xMinYMin meet\">\n <a style=\"text-decoration: none;\" xlink:href=\"/en-US/docs/Web/API/EventTarget\">\n <rect x=\"0\" y=\"0\" width=\"88\" height=\"25\" fill=\"#fff\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"44\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n EventTarget\n </text>\n </a>\n <line x1=\"88\" y1=\"14\" x2=\"118\" y2=\"14\" stroke=\"#D4DDE4\"></line>\n <polyline points=\"88,14 98,9 98,19 88,14\" stroke=\"#D4DDE4\" fill=\"#fff\"></polyline>\n <a style=\"text-decoration: none;\" xlink:href=\"/en-US/docs/Web/API/AudioNode\">\n <rect x=\"118\" y=\"0\" width=\"75\" height=\"25\" fill=\"#fff\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"155.5\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n AudioNode\n </text>\n </a>\n <line x1=\"193\" y1=\"14\" x2=\"223\" y2=\"14\" stroke=\"#D4DDE4\"></line>\n <polyline points=\"193,14 203,9 203,19 193,14\" stroke=\"#D4DDE4\" fill=\"#fff\"></polyline>\n <a style=\"text-decoration: none;\" xlink:href=\"/en-US/docs/Web/API/AnalyserNode\" aria-current=\"page\">\n <rect x=\"223\" y=\"0\" width=\"96\" height=\"25\" fill=\"#F4F7F8\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"271\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n AnalyserNode\n </text>\n </a></svg>\n<figure class=\"table-container\"><table class=\"properties\">\n <tbody>\n <tr>\n <th scope=\"row\">Number of inputs</th>\n <td><code>1</code></td>\n </tr>\n <tr>\n <th scope=\"row\">Number of outputs</th>\n <td><code>1</code> (but may be left unconnected)</td>\n </tr>\n <tr>\n <th scope=\"row\">Channel count mode</th>\n <td><code>\"max\"</code></td>\n </tr>\n <tr>\n <th scope=\"row\">Channel count</th>\n <td><code>2</code></td>\n </tr>\n <tr>\n <th scope=\"row\">Channel interpretation</th>\n <td><code>\"speakers\"</code></td>\n </tr>\n </tbody>\n</table></figure>"}},{"type":"prose","value":{"id":"constructor","title":"Constructor","isH3":false,"content":"<dl>\n <dt id=\"analysernode\"><a href=\"/en-US/docs/Web/API/AnalyserNode/AnalyserNode\" title=\"AnalyserNode()\"><code>AnalyserNode()</code></a></dt>\n <dd>\n <p>Creates a new instance of an <code>AnalyserNode</code> object.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"instance_properties","title":"Instance properties","isH3":false,"content":"<p><em>Inherits properties from its parent, <a href=\"/en-US/docs/Web/API/AudioNode\"><code>AudioNode</code></a></em>.</p>\n<dl>\n <dt id=\"analysernode.fftsize\"><a href=\"/en-US/docs/Web/API/AnalyserNode/fftSize\"><code>AnalyserNode.fftSize</code></a></dt>\n <dd>\n <p>An unsigned long value representing the size of the FFT (<a href=\"https://en.wikipedia.org/wiki/Fast_Fourier_transform\" class=\"external\" target=\"_blank\">Fast Fourier Transform</a>) to be used to determine the frequency domain.</p>\n </dd>\n <dt id=\"analysernode.frequencybincount\"><a href=\"/en-US/docs/Web/API/AnalyserNode/frequencyBinCount\"><code>AnalyserNode.frequencyBinCount</code></a> <span title=\"This value may not be changed.\" class=\"badge inline readonly\">Read only </span></dt>\n <dd>\n <p>An unsigned long value half that of the FFT size. This generally equates to the number of data values you will have to play with for the visualization.</p>\n </dd>\n <dt id=\"analysernode.mindecibels\"><a href=\"/en-US/docs/Web/API/AnalyserNode/minDecibels\"><code>AnalyserNode.minDecibels</code></a></dt>\n <dd>\n <p>A double value representing the minimum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the minimum value for the range of results when using <code>getByteFrequencyData()</code>.</p>\n </dd>\n <dt id=\"analysernode.maxdecibels\"><a href=\"/en-US/docs/Web/API/AnalyserNode/maxDecibels\"><code>AnalyserNode.maxDecibels</code></a></dt>\n <dd>\n <p>A double value representing the maximum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the maximum value for the range of results when using <code>getByteFrequencyData()</code>.</p>\n </dd>\n <dt id=\"analysernode.smoothingtimeconstant\"><a href=\"/en-US/docs/Web/API/AnalyserNode/smoothingTimeConstant\"><code>AnalyserNode.smoothingTimeConstant</code></a></dt>\n <dd>\n <p>A double value representing the averaging constant with the last analysis frame — basically, it makes the transition between values over time smoother.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"instance_methods","title":"Instance methods","isH3":false,"content":"<p><em>Inherits methods from its parent, <a href=\"/en-US/docs/Web/API/AudioNode\"><code>AudioNode</code></a></em>.</p>\n<dl>\n <dt id=\"analysernode.getfloatfrequencydata\"><a href=\"/en-US/docs/Web/API/AnalyserNode/getFloatFrequencyData\"><code>AnalyserNode.getFloatFrequencyData()</code></a></dt>\n <dd>\n <p>Copies the current frequency data into a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array\"><code>Float32Array</code></a> array passed into it.</p>\n </dd>\n <dt id=\"analysernode.getbytefrequencydata\"><a href=\"/en-US/docs/Web/API/AnalyserNode/getByteFrequencyData\"><code>AnalyserNode.getByteFrequencyData()</code></a></dt>\n <dd>\n <p>Copies the current frequency data into a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array\"><code>Uint8Array</code></a> (unsigned byte array) passed into it.</p>\n </dd>\n <dt id=\"analysernode.getfloattimedomaindata\"><a href=\"/en-US/docs/Web/API/AnalyserNode/getFloatTimeDomainData\"><code>AnalyserNode.getFloatTimeDomainData()</code></a></dt>\n <dd>\n <p>Copies the current waveform, or time-domain, data into a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array\"><code>Float32Array</code></a> array passed into it.</p>\n </dd>\n <dt id=\"analysernode.getbytetimedomaindata\"><a href=\"/en-US/docs/Web/API/AnalyserNode/getByteTimeDomainData\"><code>AnalyserNode.getByteTimeDomainData()</code></a></dt>\n <dd>\n <p>Copies the current waveform, or time-domain, data into a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array\"><code>Uint8Array</code></a> (unsigned byte array) passed into it.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"examples","title":"Examples","isH3":false,"content":"<div class=\"notecard note\" id=\"sect1\">\n <p><strong>Note:</strong> See the guide <a href=\"/en-US/docs/Web/API/Web_Audio_API/Visualizations_with_Web_Audio_API\">Visualizations with Web Audio API</a> for more information on creating audio visualizations.</p>\n</div>"}},{"type":"prose","value":{"id":"basic_usage","title":"Basic usage","isH3":true,"content":"<p>\n The following example shows basic usage of an <a href=\"/en-US/docs/Web/API/AudioContext\"><code>AudioContext</code></a> to create an <code>AnalyserNode</code>, then <a href=\"/en-US/docs/Web/API/window/requestAnimationFrame\" title=\"requestAnimationFrame\"><code>requestAnimationFrame</code></a> and <a href=\"/en-US/docs/Web/HTML/Element/canvas\"><code><canvas></code></a> to collect time domain data repeatedly and draw an \"oscilloscope style\" output of the current audio input.\n For more complete applied examples/information, check out our <a href=\"https://mdn.github.io/webaudio-examples/voice-change-o-matic/\" class=\"external\" target=\"_blank\">Voice-change-O-matic</a> demo (see <a href=\"https://github.com/mdn/webaudio-examples/tree/main/voice-change-o-matic/scripts/app.js#L108-L193\" class=\"external\" target=\"_blank\">app.js lines 108-193</a> for relevant code).\n</p>\n<div class=\"code-example\"><p class=\"example-header\"><span class=\"language-name\">js</span></p><pre class=\"brush: js notranslate\" data-signature=\"lCfKfan8uYSgq4FewHNLhbbc8J2YLFZPUhjDVdZkXJo=\"><code><span class=\"token keyword\">const</span> audioCtx <span class=\"token operator\">=</span> <span class=\"token keyword\">new</span> <span class=\"token punctuation\">(</span>window<span class=\"token punctuation\">.</span>AudioContext <span class=\"token operator\">||</span> window<span class=\"token punctuation\">.</span>webkitAudioContext<span class=\"token punctuation\">)</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n<span class=\"token comment\">// …</span>\n\n<span class=\"token keyword\">const</span> analyser <span class=\"token operator\">=</span> audioCtx<span class=\"token punctuation\">.</span><span class=\"token function\">createAnalyser</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\nanalyser<span class=\"token punctuation\">.</span>fftSize <span class=\"token operator\">=</span> <span class=\"token number\">2048</span><span class=\"token punctuation\">;</span>\n\n<span class=\"token keyword\">const</span> bufferLength <span class=\"token operator\">=</span> analyser<span class=\"token punctuation\">.</span>frequencyBinCount<span class=\"token punctuation\">;</span>\n<span class=\"token keyword\">const</span> dataArray <span class=\"token operator\">=</span> <span class=\"token keyword\">new</span> <span class=\"token class-name\">Uint8Array</span><span class=\"token punctuation\">(</span>bufferLength<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\nanalyser<span class=\"token punctuation\">.</span><span class=\"token function\">getByteTimeDomainData</span><span class=\"token punctuation\">(</span>dataArray<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n<span class=\"token comment\">// Connect the source to be analysed</span>\nsource<span class=\"token punctuation\">.</span><span class=\"token function\">connect</span><span class=\"token punctuation\">(</span>analyser<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n<span class=\"token comment\">// Get a canvas defined with ID \"oscilloscope\"</span>\n<span class=\"token keyword\">const</span> canvas <span class=\"token operator\">=</span> document<span class=\"token punctuation\">.</span><span class=\"token function\">getElementById</span><span class=\"token punctuation\">(</span><span class=\"token string\">\"oscilloscope\"</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n<span class=\"token keyword\">const</span> canvasCtx <span class=\"token operator\">=</span> canvas<span class=\"token punctuation\">.</span><span class=\"token function\">getContext</span><span class=\"token punctuation\">(</span><span class=\"token string\">\"2d\"</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n<span class=\"token comment\">// draw an oscilloscope of the current audio source</span>\n\n<span class=\"token keyword\">function</span> <span class=\"token function\">draw</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span> <span class=\"token punctuation\">{</span>\n <span class=\"token function\">requestAnimationFrame</span><span class=\"token punctuation\">(</span>draw<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n analyser<span class=\"token punctuation\">.</span><span class=\"token function\">getByteTimeDomainData</span><span class=\"token punctuation\">(</span>dataArray<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n canvasCtx<span class=\"token punctuation\">.</span>fillStyle <span class=\"token operator\">=</span> <span class=\"token string\">\"rgb(200, 200, 200)\"</span><span class=\"token punctuation\">;</span>\n canvasCtx<span class=\"token punctuation\">.</span><span class=\"token function\">fillRect</span><span class=\"token punctuation\">(</span><span class=\"token number\">0</span><span class=\"token punctuation\">,</span> <span class=\"token number\">0</span><span class=\"token punctuation\">,</span> canvas<span class=\"token punctuation\">.</span>width<span class=\"token punctuation\">,</span> canvas<span class=\"token punctuation\">.</span>height<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n canvasCtx<span class=\"token punctuation\">.</span>lineWidth <span class=\"token operator\">=</span> <span class=\"token number\">2</span><span class=\"token punctuation\">;</span>\n canvasCtx<span class=\"token punctuation\">.</span>strokeStyle <span class=\"token operator\">=</span> <span class=\"token string\">\"rgb(0, 0, 0)\"</span><span class=\"token punctuation\">;</span>\n\n canvasCtx<span class=\"token punctuation\">.</span><span class=\"token function\">beginPath</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n\n <span class=\"token keyword\">const</span> sliceWidth <span class=\"token operator\">=</span> <span class=\"token punctuation\">(</span>canvas<span class=\"token punctuation\">.</span>width <span class=\"token operator\">*</span> <span class=\"token number\">1.0</span><span class=\"token punctuation\">)</span> <span class=\"token operator\">/</span> bufferLength<span class=\"token punctuation\">;</span>\n <span class=\"token keyword\">let</span> x <span class=\"token operator\">=</span> <span class=\"token number\">0</span><span class=\"token punctuation\">;</span>\n\n <span class=\"token keyword\">for</span> <span class=\"token punctuation\">(</span><span class=\"token keyword\">let</span> i <span class=\"token operator\">=</span> <span class=\"token number\">0</span><span class=\"token punctuation\">;</span> i <span class=\"token operator\"><</span> bufferLength<span class=\"token punctuation\">;</span> i<span class=\"token operator\">++</span><span class=\"token punctuation\">)</span> <span class=\"token punctuation\">{</span>\n <span class=\"token keyword\">const</span> v <span class=\"token operator\">=</span> dataArray<span class=\"token punctuation\">[</span>i<span class=\"token punctuation\">]</span> <span class=\"token operator\">/</span> <span class=\"token number\">128.0</span><span class=\"token punctuation\">;</span>\n <span class=\"token keyword\">const</span> y <span class=\"token operator\">=</span> <span class=\"token punctuation\">(</span>v <span class=\"token operator\">*</span> canvas<span class=\"token punctuation\">.</span>height<span class=\"token punctuation\">)</span> <span class=\"token operator\">/</span> <span class=\"token number\">2</span><span class=\"token punctuation\">;</span>\n\n <span class=\"token keyword\">if</span> <span class=\"token punctuation\">(</span>i <span class=\"token operator\">===</span> <span class=\"token number\">0</span><span class=\"token punctuation\">)</span> <span class=\"token punctuation\">{</span>\n canvasCtx<span class=\"token punctuation\">.</span><span class=\"token function\">moveTo</span><span class=\"token punctuation\">(</span>x<span class=\"token punctuation\">,</span> y<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n <span class=\"token punctuation\">}</span> <span class=\"token keyword\">else</span> <span class=\"token punctuation\">{</span>\n canvasCtx<span class=\"token punctuation\">.</span><span class=\"token function\">lineTo</span><span class=\"token punctuation\">(</span>x<span class=\"token punctuation\">,</span> y<span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n <span class=\"token punctuation\">}</span>\n\n x <span class=\"token operator\">+=</span> sliceWidth<span class=\"token punctuation\">;</span>\n <span class=\"token punctuation\">}</span>\n\n canvasCtx<span class=\"token punctuation\">.</span><span class=\"token function\">lineTo</span><span class=\"token punctuation\">(</span>canvas<span class=\"token punctuation\">.</span>width<span class=\"token punctuation\">,</span> canvas<span class=\"token punctuation\">.</span>height <span class=\"token operator\">/</span> <span class=\"token number\">2</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n canvasCtx<span class=\"token punctuation\">.</span><span class=\"token function\">stroke</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n<span class=\"token punctuation\">}</span>\n\n<span class=\"token function\">draw</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n</code></pre></div>"}},{"type":"specifications","value":{"title":"Specifications","id":"specifications","isH3":false,"specifications":[{"bcdSpecificationURL":"https://webaudio.github.io/web-audio-api/#AnalyserNode","title":"Web Audio API"}],"query":"api.AnalyserNode"}},{"type":"browser_compatibility","value":{"title":"Browser compatibility","id":"browser_compatibility","isH3":false,"query":"api.AnalyserNode"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n <li><a href=\"/en-US/docs/Web/API/Web_Audio_API/Using_Web_Audio_API\">Using the Web Audio API</a></li>\n</ul>"}}],"toc":[{"text":"Constructor","id":"constructor"},{"text":"Instance properties","id":"instance_properties"},{"text":"Instance methods","id":"instance_methods"},{"text":"Examples","id":"examples"},{"text":"Specifications","id":"specifications"},{"text":"Browser compatibility","id":"browser_compatibility"},{"text":"See also","id":"see_also"}],"summary":"The AnalyserNode interface represents a node able to provide real-time frequency and time-domain analysis information. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations.","popularity":0.0064,"modified":"2023-03-02T05:40:03.000Z","other_translations":[{"locale":"es","title":"AnalyserNode","native":"Español"},{"locale":"fr","title":"AnalyserNode","native":"Français"},{"locale":"ja","title":"AnalyserNode","native":"日本語"},{"locale":"ko","title":"AnalyserNode","native":"한국어"},{"locale":"ru","title":"AnalyserNode","native":"Русский"},{"locale":"zh-CN","title":"AnalyserNode","native":"中文 (简体)"},{"locale":"zh-TW","title":"AnalyserNode","native":"正體中文 (繁體)"}],"source":{"folder":"en-us/web/api/analysernode","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/api/analysernode/index.md","last_commit_url":"https://github.com/mdn/content/commit/2c9f6f0688db9b4437f998321044fdd22afed546","filename":"index.md"},"short_title":"AnalyserNode","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/API","title":"Web APIs"},{"uri":"/en-US/docs/Web/API/AnalyserNode","title":"AnalyserNode"}],"pageTitle":"AnalyserNode - Web APIs | MDN","noIndexing":false}}</script></body></html>