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BiquadFilterNode.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>BiquadFilterNode - Web APIs | MDN</title><link rel="alternate" title="BiquadFilterNode" href="https://developer.mozilla.org/fr/docs/Web/API/BiquadFilterNode" hreflang="fr"/><link rel="alternate" title="BiquadFilterNode" href="https://developer.mozilla.org/ko/docs/Web/API/BiquadFilterNode" hreflang="ko"/><link rel="alternate" title="BiquadFilterNode" href="https://developer.mozilla.org/pt-BR/docs/Web/API/BiquadFilterNode" hreflang="pt"/><link rel="alternate" title="BiquadFilterNode" href="https://developer.mozilla.org/zh-CN/docs/Web/API/BiquadFilterNode" hreflang="zh"/><link rel="alternate" title="BiquadFilterNode" href="https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode" 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 BiquadFilterNode interface represents a simple low-order filter, and is created using the BaseAudioContext/createBiquadFilter method. It is an AudioNode that can represent different kinds of filters, tone control devices, and graphic equalizers. A BiquadFilterNode always has exactly one input and one output."/><meta property="og:url" content="https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode"/><meta property="og:title" content="BiquadFilterNode - Web APIs | MDN"/><meta property="og:locale" content="en-US"/><meta property="og:description" content="The BiquadFilterNode interface represents a simple low-order filter, and is created using the BaseAudioContext/createBiquadFilter method. It is an AudioNode that can represent different kinds of filters, tone control devices, and graphic equalizers. A BiquadFilterNode always has exactly one input and one output."/><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/BiquadFilterNode"/><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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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="#example">Example</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/BiquadFilterNode" aria-current="page"><code>BiquadFilterNode</code></a></em></strong></li><li class="toggle"><details open=""><summary>Constructor</summary><ol><li><a href="/en-US/docs/Web/API/BiquadFilterNode/BiquadFilterNode"><code>BiquadFilterNode()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Instance properties</summary><ol><li><a href="/en-US/docs/Web/API/BiquadFilterNode/detune"><code>detune</code></a></li><li><a href="/en-US/docs/Web/API/BiquadFilterNode/frequency"><code>frequency</code></a></li><li><a href="/en-US/docs/Web/API/BiquadFilterNode/gain"><code>gain</code></a></li><li><a href="/en-US/docs/Web/API/BiquadFilterNode/Q"><code>Q</code></a></li><li><a href="/en-US/docs/Web/API/BiquadFilterNode/type"><code>type</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/API/BiquadFilterNode/getFrequencyResponse"><code>getFrequencyResponse()</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/AnalyserNode"><code>AnalyserNode</code></a></li><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/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="#example">Example</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>BiquadFilterNode</h1></header><div class="section-content"><p>The <code>BiquadFilterNode</code> interface represents a simple low-order filter, and is created using the <a href="/en-US/docs/Web/API/BaseAudioContext/createBiquadFilter"><code>BaseAudioContext/createBiquadFilter</code></a> method. It is an <a href="/en-US/docs/Web/API/AudioNode"><code>AudioNode</code></a> that can represent different kinds of filters, tone control devices, and graphic equalizers. A <code>BiquadFilterNode</code> always has exactly one input and one output.</p><svg viewBox="-1 -1 650 42" preserveAspectRatio="xMinYMin meet">
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<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></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> (not used in the default count mode)</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="biquadfilternode"><a href="/en-US/docs/Web/API/BiquadFilterNode/BiquadFilterNode" title="BiquadFilterNode()"><code>BiquadFilterNode()</code></a></dt>
<dd>
<p>Creates a new instance of a <code>BiquadFilterNode</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>
<div class="notecard note" id="sect1">
<p><strong>Note:</strong> Though the <code>AudioParam</code> objects returned are read-only, the values they represent are not.</p>
</div>
<dl>
<dt id="biquadfilternode.frequency"><a href="/en-US/docs/Web/API/BiquadFilterNode/frequency"><code>BiquadFilterNode.frequency</code></a> <span title="This value may not be changed." class="badge inline readonly">Read only </span></dt>
<dd>
<p>An <a href="/en-US/docs/Web/API/AudioParam#a-rate">a-rate</a> <a href="/en-US/docs/Web/API/AudioParam"><code>AudioParam</code></a>, a double representing a frequency in the current filtering algorithm measured in hertz (Hz).</p>
</dd>
<dt id="biquadfilternode.detune"><a href="/en-US/docs/Web/API/BiquadFilterNode/detune"><code>BiquadFilterNode.detune</code></a> <span title="This value may not be changed." class="badge inline readonly">Read only </span></dt>
<dd>
<p>An <a href="/en-US/docs/Web/API/AudioParam#a-rate">a-rate</a> <a href="/en-US/docs/Web/API/AudioParam"><code>AudioParam</code></a> representing detuning of the frequency in <a href="https://en.wikipedia.org/wiki/Cent_%28music%29" class="external" target="_blank">cents</a>.</p>
</dd>
<dt id="biquadfilternode.q"><a href="/en-US/docs/Web/API/BiquadFilterNode/Q"><code>BiquadFilterNode.Q</code></a> <span title="This value may not be changed." class="badge inline readonly">Read only </span></dt>
<dd>
<p>An <a href="/en-US/docs/Web/API/AudioParam#a-rate">a-rate</a> <a href="/en-US/docs/Web/API/AudioParam"><code>AudioParam</code></a>, a double representing a <a href="https://en.wikipedia.org/wiki/Q_factor" class="external" target="_blank">Q factor</a>, or <em>quality factor</em>.</p>
</dd>
<dt id="biquadfilternode.gain"><a href="/en-US/docs/Web/API/BiquadFilterNode/gain"><code>BiquadFilterNode.gain</code></a> <span title="This value may not be changed." class="badge inline readonly">Read only </span></dt>
<dd>
<p>An <a href="/en-US/docs/Web/API/AudioParam#a-rate">a-rate</a> <a href="/en-US/docs/Web/API/AudioParam"><code>AudioParam</code></a>, a double representing the <a href="https://en.wikipedia.org/wiki/Gain" class="external" target="_blank">gain</a> used in the current filtering algorithm.</p>
</dd>
<dt id="biquadfilternode.type"><a href="/en-US/docs/Web/API/BiquadFilterNode/type"><code>BiquadFilterNode.type</code></a></dt>
<dd>
<p>A string value defining the kind of filtering algorithm the node is implementing.</p>
<figure class="table-container"><table class="standard-table">
<caption>
The meaning of the different parameters depending on the type of the filter
(detune has the same meaning regardless, so isn't listed below)
</caption>
<thead>
<tr>
<th scope="row"><code>type</code></th>
<th scope="col">Description</th>
<th scope="col"><code>frequency</code></th>
<th scope="col"><code>Q</code></th>
<th scope="col"><code>gain</code></th>
</tr>
</thead>
<tbody>
<tr>
<th scope="row"><code>lowpass</code></th>
<td>
Standard second-order resonant lowpass filter with 12dB/octave rolloff.
Frequencies below the cutoff pass through; frequencies above it are
attenuated.
</td>
<td>The cutoff frequency.</td>
<td>
Indicates how peaked the frequency is around the cutoff. The greater the
value is, the greater is the peak.
</td>
<td><em>Not used</em></td>
</tr>
<tr>
<th scope="row"><code>highpass</code></th>
<td>
Standard second-order resonant highpass filter with 12dB/octave rolloff.
Frequencies below the cutoff are attenuated; frequencies above it pass
through.
</td>
<td>The cutoff frequency.</td>
<td>
Indicates how peaked the frequency is around the cutoff. The greater the
value, the greater the peak.
</td>
<td><em>Not used</em></td>
</tr>
<tr>
<th scope="row"><code>bandpass</code></th>
<td>
Standard second-order bandpass filter. Frequencies outside the given
range of frequencies are attenuated; the frequencies inside it pass
through.
</td>
<td>The center of the range of frequencies.</td>
<td>
Controls the width of the frequency band. The greater the
<code>Q</code> value, the smaller the frequency band.
</td>
<td><em>Not used</em></td>
</tr>
<tr>
<th scope="row"><code>lowshelf</code></th>
<td>
Standard second-order lowshelf filter. Frequencies lower than the
frequency get a boost, or an attenuation; frequencies over it are
unchanged.
</td>
<td>The upper limit of the frequencies getting a boost or an attenuation.</td>
<td><em>Not used</em></td>
<td>The boost, in dB, to be applied; if negative, it will be an attenuation.</td>
</tr>
<tr>
<th scope="row"><code>highshelf</code></th>
<td>
Standard second-order highshelf filter. Frequencies higher than the
frequency get a boost or an attenuation; frequencies lower than it are
unchanged.
</td>
<td>The lower limit of the frequencies getting a boost or an attenuation.</td>
<td><em>Not used</em></td>
<td>The boost, in dB, to be applied; if negative, it will be an attenuation.</td>
</tr>
<tr>
<th scope="row"><code>peaking</code></th>
<td>
Frequencies inside the range get a boost or an attenuation; frequencies
outside it are unchanged.
</td>
<td>The middle of the frequency range getting a boost or an attenuation.</td>
<td>
Controls the width of the frequency band. The greater the
<code>Q</code> value, the smaller the frequency band.
</td>
<td>The boost, in dB, to be applied; if negative, it will be an attenuation.</td>
</tr>
<tr>
<th scope="row"><code>notch</code></th>
<td>
Standard
<a href="https://en.wikipedia.org/wiki/Band-stop_filter" class="external" target="_blank">notch</a>
filter, also called a <em>band-stop</em> or
<em>band-rejection</em> filter. It is the opposite of a bandpass filter:
frequencies outside the give range of frequencies pass through;
frequencies inside it are attenuated.
</td>
<td>The center of the range of frequencies.</td>
<td>
Controls the width of the frequency band. The greater the
<code>Q</code> value, the smaller the frequency band.
</td>
<td><em>Not used</em></td>
</tr>
<tr>
<th scope="row"><code>allpass</code></th>
<td>
Standard second-order
<a href="https://en.wikipedia.org/wiki/All-pass_filter#Digital_Implementation" class="external" target="_blank">allpass</a>
filter. It lets all frequencies through, but changes the
phase-relationship between the various frequencies.
</td>
<td>
The frequency with the maximal
<a href="https://en.wikipedia.org/wiki/Group_delay_and_phase_delay" class="external" target="_blank">group delay</a>, that is, the frequency where the center of the phase transition
occurs.
</td>
<td>
Controls how sharp the transition is at the medium frequency. The larger
this parameter is, the sharper and larger the transition will be.
</td>
<td><em>Not used</em></td>
</tr>
</tbody>
</table></figure>
</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="biquadfilternode.getfrequencyresponse"><a href="/en-US/docs/Web/API/BiquadFilterNode/getFrequencyResponse"><code>BiquadFilterNode.getFrequencyResponse()</code></a></dt>
<dd>
<p>From the current filter parameter settings this method calculates the frequency response for frequencies specified in the provided array of frequencies.</p>
</dd>
</dl></div></section><section aria-labelledby="example"><h2 id="example"><a href="#example">Example</a></h2><div class="section-content"><p>See <a href="/en-US/docs/Web/API/BaseAudioContext/createBiquadFilter#examples"><code>AudioContext.createBiquadFilter</code></a> for example code that shows how to use an <code>AudioContext</code> to create a Biquad filter node.</p></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/#BiquadFilterNode">Web Audio API<!-- --> <br/><small># <!-- -->BiquadFilterNode</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/biquadfilternode/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":"BiquadFilterNode","mdn_url":"/en-US/docs/Web/API/BiquadFilterNode","locale":"en-US","native":"English (US)","browserCompat":["api.BiquadFilterNode"],"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/BiquadFilterNode\" aria-current=\"page\"><code>BiquadFilterNode</code></a></em></strong></li><li class=\"toggle\"><details open=\"\"><summary>Constructor</summary><ol><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/BiquadFilterNode\"><code>BiquadFilterNode()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instance properties</summary><ol><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/detune\"><code>detune</code></a></li><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/frequency\"><code>frequency</code></a></li><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/gain\"><code>gain</code></a></li><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/Q\"><code>Q</code></a></li><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/type\"><code>type</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/API/BiquadFilterNode/getFrequencyResponse\"><code>getFrequencyResponse()</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/AnalyserNode\"><code>AnalyserNode</code></a></li><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/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 <code>BiquadFilterNode</code> interface represents a simple low-order filter, and is created using the <a href=\"/en-US/docs/Web/API/BaseAudioContext/createBiquadFilter\"><code>BaseAudioContext/createBiquadFilter</code></a> method. It is an <a href=\"/en-US/docs/Web/API/AudioNode\"><code>AudioNode</code></a> that can represent different kinds of filters, tone control devices, and graphic equalizers. A <code>BiquadFilterNode</code> always has exactly one input and one output.</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/BiquadFilterNode\" aria-current=\"page\">\n <rect x=\"223\" y=\"0\" width=\"128\" height=\"25\" fill=\"#F4F7F8\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"287\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n BiquadFilterNode\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></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> (not used in the default count mode)</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=\"biquadfilternode\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/BiquadFilterNode\" title=\"BiquadFilterNode()\"><code>BiquadFilterNode()</code></a></dt>\n <dd>\n <p>Creates a new instance of a <code>BiquadFilterNode</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<div class=\"notecard note\" id=\"sect1\">\n <p><strong>Note:</strong> Though the <code>AudioParam</code> objects returned are read-only, the values they represent are not.</p>\n</div>\n<dl>\n <dt id=\"biquadfilternode.frequency\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/frequency\"><code>BiquadFilterNode.frequency</code></a> <span title=\"This value may not be changed.\" class=\"badge inline readonly\">Read only </span></dt>\n <dd>\n <p>An <a href=\"/en-US/docs/Web/API/AudioParam#a-rate\">a-rate</a> <a href=\"/en-US/docs/Web/API/AudioParam\"><code>AudioParam</code></a>, a double representing a frequency in the current filtering algorithm measured in hertz (Hz).</p>\n </dd>\n <dt id=\"biquadfilternode.detune\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/detune\"><code>BiquadFilterNode.detune</code></a> <span title=\"This value may not be changed.\" class=\"badge inline readonly\">Read only </span></dt>\n <dd>\n <p>An <a href=\"/en-US/docs/Web/API/AudioParam#a-rate\">a-rate</a> <a href=\"/en-US/docs/Web/API/AudioParam\"><code>AudioParam</code></a> representing detuning of the frequency in <a href=\"https://en.wikipedia.org/wiki/Cent_%28music%29\" class=\"external\" target=\"_blank\">cents</a>.</p>\n </dd>\n <dt id=\"biquadfilternode.q\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/Q\"><code>BiquadFilterNode.Q</code></a> <span title=\"This value may not be changed.\" class=\"badge inline readonly\">Read only </span></dt>\n <dd>\n <p>An <a href=\"/en-US/docs/Web/API/AudioParam#a-rate\">a-rate</a> <a href=\"/en-US/docs/Web/API/AudioParam\"><code>AudioParam</code></a>, a double representing a <a href=\"https://en.wikipedia.org/wiki/Q_factor\" class=\"external\" target=\"_blank\">Q factor</a>, or <em>quality factor</em>.</p>\n </dd>\n <dt id=\"biquadfilternode.gain\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/gain\"><code>BiquadFilterNode.gain</code></a> <span title=\"This value may not be changed.\" class=\"badge inline readonly\">Read only </span></dt>\n <dd>\n <p>An <a href=\"/en-US/docs/Web/API/AudioParam#a-rate\">a-rate</a> <a href=\"/en-US/docs/Web/API/AudioParam\"><code>AudioParam</code></a>, a double representing the <a href=\"https://en.wikipedia.org/wiki/Gain\" class=\"external\" target=\"_blank\">gain</a> used in the current filtering algorithm.</p>\n </dd>\n <dt id=\"biquadfilternode.type\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/type\"><code>BiquadFilterNode.type</code></a></dt>\n <dd>\n <p>A string value defining the kind of filtering algorithm the node is implementing.</p>\n <figure class=\"table-container\"><table class=\"standard-table\">\n <caption>\n The meaning of the different parameters depending on the type of the filter\n (detune has the same meaning regardless, so isn't listed below)\n </caption>\n <thead>\n <tr>\n <th scope=\"row\"><code>type</code></th>\n <th scope=\"col\">Description</th>\n <th scope=\"col\"><code>frequency</code></th>\n <th scope=\"col\"><code>Q</code></th>\n <th scope=\"col\"><code>gain</code></th>\n </tr>\n </thead>\n <tbody>\n <tr>\n <th scope=\"row\"><code>lowpass</code></th>\n <td>\n Standard second-order resonant lowpass filter with 12dB/octave rolloff.\n Frequencies below the cutoff pass through; frequencies above it are\n attenuated.\n </td>\n <td>The cutoff frequency.</td>\n <td>\n Indicates how peaked the frequency is around the cutoff. The greater the\n value is, the greater is the peak.\n </td>\n <td><em>Not used</em></td>\n </tr>\n <tr>\n <th scope=\"row\"><code>highpass</code></th>\n <td>\n Standard second-order resonant highpass filter with 12dB/octave rolloff.\n Frequencies below the cutoff are attenuated; frequencies above it pass\n through.\n </td>\n <td>The cutoff frequency.</td>\n <td>\n Indicates how peaked the frequency is around the cutoff. The greater the\n value, the greater the peak.\n </td>\n <td><em>Not used</em></td>\n </tr>\n <tr>\n <th scope=\"row\"><code>bandpass</code></th>\n <td>\n Standard second-order bandpass filter. Frequencies outside the given\n range of frequencies are attenuated; the frequencies inside it pass\n through.\n </td>\n <td>The center of the range of frequencies.</td>\n <td>\n Controls the width of the frequency band. The greater the\n <code>Q</code> value, the smaller the frequency band.\n </td>\n <td><em>Not used</em></td>\n </tr>\n <tr>\n <th scope=\"row\"><code>lowshelf</code></th>\n <td>\n Standard second-order lowshelf filter. Frequencies lower than the\n frequency get a boost, or an attenuation; frequencies over it are\n unchanged.\n </td>\n <td>The upper limit of the frequencies getting a boost or an attenuation.</td>\n <td><em>Not used</em></td>\n <td>The boost, in dB, to be applied; if negative, it will be an attenuation.</td>\n </tr>\n <tr>\n <th scope=\"row\"><code>highshelf</code></th>\n <td>\n Standard second-order highshelf filter. Frequencies higher than the\n frequency get a boost or an attenuation; frequencies lower than it are\n unchanged.\n </td>\n <td>The lower limit of the frequencies getting a boost or an attenuation.</td>\n <td><em>Not used</em></td>\n <td>The boost, in dB, to be applied; if negative, it will be an attenuation.</td>\n </tr>\n <tr>\n <th scope=\"row\"><code>peaking</code></th>\n <td>\n Frequencies inside the range get a boost or an attenuation; frequencies\n outside it are unchanged.\n </td>\n <td>The middle of the frequency range getting a boost or an attenuation.</td>\n <td>\n Controls the width of the frequency band. The greater the\n <code>Q</code> value, the smaller the frequency band.\n </td>\n <td>The boost, in dB, to be applied; if negative, it will be an attenuation.</td>\n </tr>\n <tr>\n <th scope=\"row\"><code>notch</code></th>\n <td>\n Standard\n <a href=\"https://en.wikipedia.org/wiki/Band-stop_filter\" class=\"external\" target=\"_blank\">notch</a>\n filter, also called a <em>band-stop</em> or\n <em>band-rejection</em> filter. It is the opposite of a bandpass filter:\n frequencies outside the give range of frequencies pass through;\n frequencies inside it are attenuated.\n </td>\n <td>The center of the range of frequencies.</td>\n <td>\n Controls the width of the frequency band. The greater the\n <code>Q</code> value, the smaller the frequency band.\n </td>\n <td><em>Not used</em></td>\n </tr>\n <tr>\n <th scope=\"row\"><code>allpass</code></th>\n <td>\n Standard second-order\n <a href=\"https://en.wikipedia.org/wiki/All-pass_filter#Digital_Implementation\" class=\"external\" target=\"_blank\">allpass</a>\n filter. It lets all frequencies through, but changes the\n phase-relationship between the various frequencies.\n </td>\n <td>\n The frequency with the maximal\n <a href=\"https://en.wikipedia.org/wiki/Group_delay_and_phase_delay\" class=\"external\" target=\"_blank\">group delay</a>, that is, the frequency where the center of the phase transition\n occurs.\n </td>\n <td>\n Controls how sharp the transition is at the medium frequency. The larger\n this parameter is, the sharper and larger the transition will be.\n </td>\n <td><em>Not used</em></td>\n </tr>\n </tbody>\n </table></figure>\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=\"biquadfilternode.getfrequencyresponse\"><a href=\"/en-US/docs/Web/API/BiquadFilterNode/getFrequencyResponse\"><code>BiquadFilterNode.getFrequencyResponse()</code></a></dt>\n <dd>\n <p>From the current filter parameter settings this method calculates the frequency response for frequencies specified in the provided array of frequencies.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"example","title":"Example","isH3":false,"content":"<p>See <a href=\"/en-US/docs/Web/API/BaseAudioContext/createBiquadFilter#examples\"><code>AudioContext.createBiquadFilter</code></a> for example code that shows how to use an <code>AudioContext</code> to create a Biquad filter node.</p>"}},{"type":"specifications","value":{"title":"Specifications","id":"specifications","isH3":false,"specifications":[{"bcdSpecificationURL":"https://webaudio.github.io/web-audio-api/#BiquadFilterNode","title":"Web Audio API"}],"query":"api.BiquadFilterNode"}},{"type":"browser_compatibility","value":{"title":"Browser compatibility","id":"browser_compatibility","isH3":false,"query":"api.BiquadFilterNode"}},{"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":"Example","id":"example"},{"text":"Specifications","id":"specifications"},{"text":"Browser compatibility","id":"browser_compatibility"},{"text":"See also","id":"see_also"}],"summary":"The BiquadFilterNode interface represents a simple low-order filter, and is created using the BaseAudioContext/createBiquadFilter method. It is an AudioNode that can represent different kinds of filters, tone control devices, and graphic equalizers. A BiquadFilterNode always has exactly one input and one output.","popularity":0.0033,"modified":"2023-04-06T05:00:32.000Z","other_translations":[{"locale":"fr","title":"BiquadFilterNode","native":"Français"},{"locale":"ko","title":"BiquadFilterNode","native":"한국어"},{"locale":"pt-BR","title":"BiquadFilterNode","native":"Português (do Brasil)"},{"locale":"zh-CN","title":"BiquadFilterNode","native":"中文 (简体)"}],"source":{"folder":"en-us/web/api/biquadfilternode","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/api/biquadfilternode/index.md","last_commit_url":"https://github.com/mdn/content/commit/fa1301aead2cee37516b7ad5a5ec2fb21e004227","filename":"index.md"},"short_title":"BiquadFilterNode","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/API","title":"Web APIs"},{"uri":"/en-US/docs/Web/API/BiquadFilterNode","title":"BiquadFilterNode"}],"pageTitle":"BiquadFilterNode - Web APIs | MDN","noIndexing":false}}</script></body></html>