BiquadFilterNode.gain

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 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.value = 1000;
biquadFilter.gain.value = 25;

Specifications

Specification
Web Audio API
# dom-biquadfilternode-gain

Browser compatibility

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See also