BiquadFilterNode: frequency property
The frequency
property of the BiquadFilterNode
interface is an a-rate AudioParam
— a double representing a frequency in the current filtering algorithm measured in hertz (Hz).
Its default value is 350
, with a nominal range of 10
to the Nyquist frequency — that is, half of the sample rate.
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).
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
Specification |
---|
Web Audio API # dom-biquadfilternode-frequency |
Browser compatibility
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