See Also: AutomaticGainControl Members
Automatic Gain Control (AGC).
Automatic Gain Control (AGC) is an audio pre-processing which automatically normalizes the output of the captured signal by boosting or lowering input from the microphone to match a preset level so that the output signal level is virtually constant. AGC can be used by applications where the input signal dynamic range is not important but where a constant strong capture level is desired.
An application creates a AutomaticGainControl object to instantiate and control an AGC engine in the audio framework.
To attach the AutomaticGainControl to a particular Android.Media.AudioRecord, specify the audio session ID of this AudioRecord when creating the AutomaticGainControl. The audio session is retrieved by calling Android.Media.AudioRecord.AudioSessionId on the AudioRecord instance.
On some devices, an AGC can be inserted by default in the capture path by the platform according to the NoType:android/media/MediaRecorder$AudioSource;Href=../../../../reference/android/media/MediaRecorder.AudioSource.html used. The application should call AutomaticGainControl.getEnable() after creating the AGC to check the default AGC activation state on a particular AudioRecord session.
See Android.Media.Audiofx.AudioEffect class for more details on controlling audio effects.