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

BCD tables only load in the browser

See also