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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

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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 49.0 ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 49.0 ? ? ? ? ? 49.0

See also

Document Tags and Contributors

 Contributors to this page: bunnybooboo, jpmedley
 Last updated by: bunnybooboo,