W3cubDocs

BaseAudioContext.createBiquadFilter

The createBiquadFilter() method of the BaseAudioContext interface creates a BiquadFilterNode, which represents a second order filter configurable as several different common filter types.

Syntax

baseAudioContext.createBiquadFilter();

Returns

A BiquadFilterNode.

Example

The following example shows basic usage of an AudioContext to create a Biquad filter node. For a complete working example, check out our voice-change-o-matic demo (look at the source code too).

var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

//set up the different audio nodes we will use for the app
var analyser = audioCtx.createAnalyser();
var distortion = audioCtx.createWaveShaper();
var gainNode = audioCtx.createGain();
var biquadFilter = audioCtx.createBiquadFilter();
var convolver = audioCtx.createConvolver();

// connect the nodes together

source = audioCtx.createMediaStreamSource(stream);
source.connect(analyser);
analyser.connect(distortion);
distortion.connect(biquadFilter);
biquadFilter.connect(convolver);
convolver.connect(gainNode);
gainNode.connect(audioCtx.destination);

// Manipulate the Biquad filter

biquadFilter.type = "lowshelf";
biquadFilter.frequency.setValueAtTime(1000, audioCtx.currentTime);
biquadFilter.gain.setValueAtTime(25, audioCtx.currentTime);

Specifications

Specification	Status	Comment
Web Audio API The definition of 'createBiquadFilter()' in that specification.	Working Draft

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	10 Prefixed 10 Prefixed Prefixed Requires the vendor prefix: webkit	Yes	25	No	22 22 15 Prefixed Prefixed Requires the vendor prefix: webkit	6 Prefixed 6 Prefixed Prefixed Requires the vendor prefix: webkit