[page:Object3D] →

# [name]

The [name] represents a virtual [link:https://developer.mozilla.org/de/docs/Web/API/AudioListener listener] of the all positional and non-positional audio effects in the scene.
A three.js application usually creates a single instance of [name]. It is a mandatory construtor parameter for audios entities like [page:Audio Audio] and [page:PositionalAudio PositionalAudio].
In most cases, the listener object is a child of the camera. So the 3D transformation of the camera represents the 3D transformation of the listener.

## Example

[example:webaudio_sandbox webaudio / sandbox ]
[example:webaudio_timing webaudio / timing ]
[example:webaudio_visualizer webaudio / visualizer ]

`// create an AudioListener and add it to the camera var listener = new THREE.AudioListener(); camera.add( listener ); // create a global audio source var sound = new THREE.Audio( listener ); // load a sound and set it as the Audio object's buffer var audioLoader = new THREE.AudioLoader(); audioLoader.load( 'sounds/ambient.ogg', function( buffer ) { sound.setBuffer( buffer ); sound.setLoop(true); sound.setVolume(0.5); sound.play(); });`

## Constructor

### [name]( )

Create a new AudioListener.

## Properties

### [property:AudioContext context]

The [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioContext AudioContext] of the [page:AudioListener listener] given in the constructor.

### [property:GainNode gain]

A [link:https://developer.mozilla.org/en-US/docs/Web/API/GainNode GainNode] created using [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/createGain AudioContext.createGain]().

### [property:AudioNode filter]

Default is *null*.

### [property:Number timeDelta]

Time delta value for audio entities. Use in context of [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioParam/linearRampToValueAtTime AudioParam.linearRampToValueAtTimeDefault](). Default is *0*.

## Methods

### [method:GainNode getInput]()

Return the [page:AudioListener.gain gainNode].

### [method:AudioListener removeFilter]()

Set the [page:AudioListener.filter filter] property to *null*.

### [method:AudioNode getFilter]()

Returns the value of the [page:AudioListener.filter filter] property.

### [method:AudioListener setFilter]( [param:AudioNode value] )

Set the [page:AudioListener.filter filter] property to *value*.

### [method:Float getMasterVolume]()

Return the volume.

### [method:AudioListener setMasterVolume]( [param:Number value] )

Set the volume.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]