IIRFilterNode.getFrequencyResponse()

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

The results are stored in two preexisting 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 parameters three Float32Arrays:

frequencyHz

An array containing hertz values that you want the frequency response for.

magResponse

An array that will contain the outputted magnitude of the frequency response for each inputted frequency (hertz) value. The magnitude values are unitless.

phaseResponse

An array that will contain the outputted phase of the frequency response for each inputted frequency (hertz) value, measured in radians.

Specifications

Specification	Status	Comment
Web Audio API The definition of 'getFrequencyResponse()' in that specification.	Working Draft

Browser compatibility

See also

• Using the Web Audio API