Web/API/ConvolverNode

The ConvolverNode interface is an AudioNode that performs a Linear Convolution on a given AudioBuffer, often used to achieve a reverb effect. A ConvolverNode always has exactly one input and one output.

Note: For more information on the theory behind Linear Convolution, see the Convolution article on Wikipedia.

Number of inputs	`1`
Number of outputs	`1`
Channel count mode	`"clamped-max"`
Channel count	`1`, `2`, or `4`
Channel interpretation	`"speakers"`

Constructor

ConvolverNode(): Creates a new ConvolverNode object instance.

Properties

Inherits properties from its parent, AudioNode.

ConvolverNode.buffer: A mono, stereo, or 4-channel AudioBuffer containing the (possibly multichannel) impulse response used by the ConvolverNode to create the reverb effect.
ConvolverNode.normalize: A boolean that controls whether the impulse response from the buffer will be scaled by an equal-power normalization when the buffer attribute is set, or not.

Methods

No specific method; inherits methods from its parent, AudioNode.

ConvolverNode Example

The following example shows basic usage of an AudioContext to create a convolver node.

Note: You will need to find an impulse response to complete the example below. See this Codepen for an applied example.

let audioCtx = new window.AudioContext();

async function createReverb() {
    let convolver = audioCtx.createConvolver();

    // load impulse response from file
    let response     = await fetch("path/to/impulse-response.wav");
    let arraybuffer  = await response.arrayBuffer();
    convolver.buffer = await audioCtx.decodeAudioData(arraybuffer);

    return convolver;
}

...

let reverb = await createReverb();

// someOtherAudioNode -> reverb -> destination
someOtherAudioNode.connect(reverb);
reverb.connect(audioCtx.destination);

Specifications

Specification	Status	Comment
Web Audio APIThe definition of 'ConvolverNode' in that specification.	Working Draft

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`ConvolverNode`	Chrome Full support 14	Edge Full support 12	Firefox Full support 25	IE No support No	Opera Full support 15	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 26	Opera Android Full support 14	Safari iOS Full support Yes	Samsung Internet Android Full support 1.0
`ConvolverNode()` constructor	Chrome Full support 55	Edge Full support 79	Firefox Full support 53	IE No support No	Opera Full support 42	Safari No support No	WebView Android Full support 55	Chrome Android Full support 55	Firefox Android Full support 53	Opera Android Full support 42	Safari iOS No support No	Samsung Internet Android Full support 6.0
`buffer`	Chrome Full support 14	Edge Full support 12	Firefox Full support 25	IE No support No	Opera Full support 15	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 26	Opera Android Full support 14	Safari iOS Full support Yes	Samsung Internet Android Full support 1.0
`normalize`	Chrome Full support 14	Edge Full support 12	Firefox Full support 25	IE No support No	Opera Full support 15	Safari Full support 6	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 26	Opera Android Full support 14	Safari iOS Full support Yes	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
No support: No support