BiquadFilterNode: frequency property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

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

BCD tables only load in the browser

See also