Acoustic echo cancellation

Information on AEC on Android devices.

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When an Android device plays and records audio at the same time, there is the possibility that a capture device could pick up the audio that is playing. The Vivox SDK includes acoustic echo cancellation (AEC), which helps to prevent this type of audio capture from occurring.

참고

If there is a headset in use on an Android device, then the capture device will likely not pick up the output from the headset’s headphones, and no special configuration is required to avoid echo.

In some scenarios, Smart Platform Audio Management (SPAM) might not be the best option to use, such as when a particular Android device does not support hardware echo cancellation. To manually control platform AEC, disable SPAM, and then invoke the

vx_set_platform_aec_enabled()

function. This function turns on or turns off the recording preset and playback stream between

SL_ANDROID_RECORDING_PRESET_VOICE_COMMUNICATION / SL_ANDROID_STREAM_VOICE

and

SL_ANDROID_RECORDING_PRESET_VOICE_RECOGNITION / SL_ANDROID_STREAM_MEDIA

, respectively.

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