The frequency
property of the BiquadFilterNode
interface Is a k-rate AudioParam
, a double representing a frequency in the current filtering algorithm measured in hertz (Hz).
frequency
's default value is 350
with a nominal range of 10
to the Nyquist frequency — that is, half of the sample rate.
Syntax
var audioCtx = new AudioContext();
var biquadFilter = audioCtx.createBiquadFilter();
biquadFilter.frequency.value = 3000;
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 [[../../../../../../../mdn.github.io/voice-change-o-matic/index|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 | Status | Comment |
Web Audio APIThe definition of 'frequency' 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.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
frequency
|
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
See also
BiquadFilterNode.frequency by Mozilla Contributors is licensed under CC-BY-SA 2.5.