The Q
property of the BiquadFilterNode
interface is an a-rate AudioParam
, a double representing a Q factor, or quality factor.
It is a dimensionless value with a default value of 1
and a nominal range of 0.0001
to 1000
.
Syntax
var audioCtx = new AudioContext(); var biquadFilter = audioCtx.createBiquadFilter(); biquadfilter.Q.value = 100;
Note: Though the AudioParam
returned is read-only, the value it represents is not.
Value
An AudioParam
.
Example
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; biquadFilter.type = "peaking"; biquadFilter.frequency.value = 1000; biquadFilter.Q.value = 100; biquadFilter.gain.value = 25;
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'Q' in that specification. |
Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Q | Chrome Full support 14 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 15 | Safari Full support 6 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 26 | Opera Android Full support 14 | Safari iOS Full support Yes | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support