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.
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Inherited Constants | |||||||||||
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From class
android.media.audiofx.AudioEffect
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Inherited Fields | |||||||||||
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From class
android.media.audiofx.AudioEffect
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Public Methods | |||||||||||
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Creates an AcousticEchoCanceler and attaches it to the AudioRecord on the audio
session specified.
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Checks if the device implements acoustic echo cancellation.
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Inherited Methods | |||||||||||
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From class
android.media.audiofx.AudioEffect
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From class
java.lang.Object
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Creates an AcousticEchoCanceler and attaches it to the AudioRecord on the audio session specified.
audioSession | system wide unique audio session identifier. The AcousticEchoCanceler will be applied to the AudioRecord with the same audio session. |
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Checks if the device implements acoustic echo cancellation.