ConvolverNode

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

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.

EventTarget AudioNode ConvolverNode
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.

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.

Instance 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.

js
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
Web Audio API
# ConvolverNode

Browser compatibility

BCD tables only load in the browser

See also