ConvolverNode
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
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
ConvolverNodeobject instance.
Instance properties
Inherits properties from its parent, AudioNode.
ConvolverNode.buffer-
A mono, stereo, or 4-channel
AudioBuffercontaining the (possibly multichannel) impulse response used by theConvolverNodeto 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
bufferattribute is set, or not.
Instance methods
No specific method; inherits methods from its parent, AudioNode.
Examples
The following example shows basic usage of an AudioContext to create a convolver node. You will need to find an impulse response to complete the example below. See our HolySpaceCow example for a complete, 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 |
|---|
| Web Audio API # ConvolverNode |
Browser compatibility
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