IIRFilterNode.getFrequencyResponse()

The getFrequencyResponse() method of the IIRFilterNode interface takes the current filtering algorithm's settings, and calculates the frequency response, specified by the frequencyHz array of frequencies.

Its results are stored in two pre-existing output arrays:

• magResponse receiving the linear magnitude.
• phaseResponse receiving the phase response, in radians.

Syntax

var audioCtx = new AudioContext();
var iirFilter = audioCtx.createIIRFilter();
iirFilter.getFrequencyResponse(myFrequencyArray,magResponseOutput,phaseResponseOutput);

Returns

None.

Parameters

getFrequencyResponse() takes, as its parameters, three Float32Arrays:

frequencyHz

An array containing hertz values, which you want from the frequency response.

magResponse

An array containing the magnitude of the frequency response from each frequency (hertz) value input. These magnitude values are unitless.

phaseResponse

An array containing the phase of the frequency response from each frequency (hertz) value input. These phase values are measured in radians.

Specifications

Browser compatibility

See also

• Using the Web Audio API