This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The AnalyserNode constructor creates a new AnalyserNode object.


var analyserNode = new AnalyserNode(context, options)


A reference to an AudioContext.
options Optional
Options are as follows:
  • fftSize: The desired initial size of the FFT for frequency-domain analysis. The default is 2048.
  • maxDecibels: The desired initial maximum power in dB for FFT analysis. The default is -30.
  • minDecibels: The desired initial minimum power in dB for FFT analysis. The default is -100.
  • smoothingTimeConstant: The desired initial smoothing constant for the FFT analysis. The default is 0.8


Specification Status Comment
Web Audio API
The definition of 'AnalyserNode' in that specification.
Working Draft Initial definition.

Browser Compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 55.0 ? ? 42 ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 55.0 ? ? ? 42 ? 55.0

Document Tags and Contributors

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