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Added in API level 16

Summary: Inherited Constants | Inherited Fields | Methods | Inherited Methods | [Expand All]

AcousticEchoCanceler

public class AcousticEchoCanceler
extends AudioEffect

java.lang.Object
↳	android.media.audiofx.AudioEffect
	↳	android.media.audiofx.AcousticEchoCanceler

Acoustic Echo Canceler (AEC).

Acoustic Echo Canceler (AEC) is an audio pre-processing which removes the contribution of the signal received from the remote party from the captured audio signal.

AEC is used by voice communication applications (voice chat, video conferencing, SIP calls) where the presence of echo with significant delay in the signal received from the remote party is highly disturbing. AEC is often used in conjunction with noise suppression (NS).

An application creates an AcousticEchoCanceler object to instantiate and control an AEC engine in the audio capture path.

To attach the AcousticEchoCanceler to a particular AudioRecord, specify the audio session ID of this AudioRecord when creating the AcousticEchoCanceler. The audio session is retrieved by calling getAudioSessionId() on the AudioRecord instance.

On some devices, an AEC can be inserted by default in the capture path by the platform according to the MediaRecorder.AudioSource used. The application should call AcousticEchoCanceler.getEnable() after creating the AEC to check the default AEC activation state on a particular AudioRecord session.

See AudioEffect class for more details on controlling audio effects.

Summary

Inherited constants

From class android.media.audiofx.AudioEffect

Inherited fields

From class android.media.audiofx.AudioEffect

Public methods
`static AcousticEchoCanceler`	`create(int audioSession)` Creates an AcousticEchoCanceler and attaches it to the AudioRecord on the audio session specified.
`static boolean`	`isAvailable()` Checks if the device implements acoustic echo cancellation.

Inherited methods

From class android.media.audiofx.AudioEffect

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public methods

create

Added in API level 16

AcousticEchoCanceler create (int audioSession)

Creates an AcousticEchoCanceler and attaches it to the AudioRecord on the audio session specified.

Parameters
`audioSession`	`int`: system wide unique audio session identifier. The AcousticEchoCanceler will be applied to the AudioRecord with the same audio session.

Returns
`AcousticEchoCanceler`	AcousticEchoCanceler created or null if the device does not implement AEC.

isAvailable

Added in API level 16

boolean isAvailable ()

Checks if the device implements acoustic echo cancellation.

Returns
`boolean`	true if the device implements acoustic echo cancellation, false otherwise.