![]() These effects for audio source is applied based on the /system/etc/audio_nf file. ![]() To use this effects in Android, device vendor should implement this support in their audio HAL. The Android framework supports audio effects such as Acoustic Echo Cancellation (AEC), Noise Suppression (NS) and Automatic Gain Control (AGC). This results in acoustic echo for the person speaking in the far end. This happens in telephony/VOIP application, when a speaker phone/loud speaker is used, the microphone receives the voice signal from speaker. What is Acoustic echo?Įcho is a sound or sounds caused by the reflection of sound waves from a surface back to the listener. ![]() Echo cancellation is method in telephony/VOIP to improve voice quality by preventing echo from being created or removing it after it is already present.
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