Patent attributes
An audio device may be configured to produce output audio and to also capture input audio for speech recognition. Beamforming may be used to produce directional audio signals that emphasize sounds received from different directions. Acoustic echo cancellation (AEC) may be used to remove components of output audio from the directional input signals. AEC may be implemented by an adaptive filter based on dynamically optimized filter coefficients. The filter coefficients may be analyzed to detect the presence of potentially problematic reflective surfaces near the audio device. When such a reflective surface is detected, the user may be notified by illuminating a directional indicator on a housing of the audio device, where the directional indicator indicates the direction of the potentially problematic surface relative to the audio device.
