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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