DynamicsCompressorNode

The DynamicsCompressorNode interface provides a compression effect, which lowers the volume of the loudest parts of the signal in order to help prevent clipping and distortion that can occur when multiple sounds are played and multiplexed together at once. This is often used in musical production and game audio. DynamicsCompressorNode is an AudioNode that has exactly one input and one output.

Number of inputs	`1`
Number of outputs	`1`
Channel count mode	`"clamped-max"`
Channel count	`2`
Channel interpretation	`"speakers"`

Constructor

DynamicsCompressorNode(): Creates a new instance of an DynamicsCompressorNode object.

Properties

Inherits properties from its parent, AudioNode.

DynamicsCompressorNode.threshold Read only: Is a k-rate AudioParam representing the decibel value above which the compression will start taking effect.
DynamicsCompressorNode.knee Read only: Is a k-rate AudioParam containing a decibel value representing the range above the threshold where the curve smoothly transitions to the compressed portion.
DynamicsCompressorNode.ratio Read only: Is a k-rate AudioParam representing the amount of change, in dB, needed in the input for a 1 dB change in the output.
DynamicsCompressorNode.reduction Read only: Is a float representing the amount of gain reduction currently applied by the compressor to the signal.
DynamicsCompressorNode.attack Read only: Is a k-rate AudioParam representing the amount of time, in seconds, required to reduce the gain by 10 dB.
DynamicsCompressorNode.release Read only: Is a k-rate AudioParam representing the amount of time, in seconds, required to increase the gain by 10 dB.

Methods

No specific methods; inherits methods from its parent, AudioNode.

Example

See BaseAudioContext.createDynamicsCompressor() example code.

Specifications

Specification
Web Audio API # DynamicsCompressorNode

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`DynamicsCompressorNode`	14	12	25	No	15	6	≤37	18	25	14	Yes	1.0
`DynamicsCompressorNode`	55 Before Chrome 59, the default values were not supported.	79	53	No	42	14.1	55 Before version 59, the default values were not supported.	55 Before Chrome 59, the default values were not supported.	53	42	14.5	6.0 Before Samsung Internet 7.0, the default values were not supported.
`attack`	14	12	25	No	15	6	≤37	18	25	14	Yes	1.0
`knee`	14	12	25	No	15	6	≤37	18	25	14	Yes	1.0
`ratio`	14	12	25	No	15	6	≤37	18	25	14	Yes	1.0
`reduction`	14 Before version 52, this was an `AudioParam.`.	12	25	No	15	6	≤37 Before version 52, this was an `AudioParam.`.	18 Before version 52, this was an `AudioParam.`.	25	14	Yes	1.0 Before Samsung Internet 6.0, this was an `AudioParam.`.
`release`	14	12	25	No	15	6	≤37	18	25	14	Yes	1.0
`threshold`	14	12	25	No	15	6	≤37	18	25	14	Yes	1.0