Below is example audio_nf file to enable AEC effects in Android. It essentially works by telling the microphone to ignore any sounds coming out of the loudspeaker. By working with an expert facial plastic and reconstructive surgeon. The goal of AEC is to remove this echo in the signal. The process to fix facial paralysis after acoustic neuroma tumor removal is rarely simple. If user wants to add any specific effects for their device, then create a vendor specific configuration file in /system/vendor/etc/audio_nf with the required effects turned on. In addition, acoustic elements in the near-side room can introduce more echo into the sound picked up by the microphones, thus increasing the amount of echo in the output signal. 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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