AnalyserNode()

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

Syntax

var analyserNode = new AnalyserNode(context, options);

Parameters

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.)

Return value

A new AnalyserNode object instance.

Specifications

Browser compatibility

See also

• BaseAudioContext.createAnalyser(), the equivalent factory method