The AnalyserNode() constructor of the Web Audio API creates a new AnalyserNode object instance.

context

A reference to an AudioContext or OfflineAudioContext.

options Optional

An object with the following properties, all optional:

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.

channelCount

Represents an integer used to determine how many channels are used when up-mixing and down-mixing connections to any inputs to the node. (See AudioNode.channelCount for more information.) Its usage and precise definition depend on the value of channelCountMode.

channelCountMode

Represents an enumerated value describing the way channels must be matched between the node's inputs and outputs. (See AudioNode.channelCountMode for more information including default values.)

channelInterpretation

Represents an enumerated value describing the meaning of the channels. This interpretation will define how audio up-mixing and down-mixing will happen. The possible values are "speakers" or "discrete". (See AudioNode.channelCountMode for more information including default values.)

• BaseAudioContext.createAnalyser(), the equivalent factory method