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BiquadFilterNode: gain property

The gain property of the BiquadFilterNode interface is an a-rate AudioParam — a double representing the gain used in the current filtering algorithm.

When its value is positive, it represents a real gain; when negative, it represents an attenuation.

It is expressed in dB, has a default value of 0, and can take a value in a nominal range of -40 to 40.

Value

An AudioParam.

Note: Though the AudioParam returned is read-only, the value it represents is not.

Examples

The following example shows basic usage of an AudioContext to create a Biquad filter node. For more complete applied examples/information, check out our Voice-change-O-matic demo (see app.js lines 108–193 for relevant code).

js

const audioCtx = new AudioContext();

//set up the different audio nodes we will use for the app
const analyser = audioCtx.createAnalyser();
const distortion = audioCtx.createWaveShaper();
const gainNode = audioCtx.createGain();
const biquadFilter = audioCtx.createBiquadFilter();
const 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.value = 1000;
biquadFilter.gain.value = 25;

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
gain 14 12 25 No 15 6 4.4.3 18 25 14 6 1.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/gain