Finally, the combination of AEC and beamforming is discussed for multi-channel recording and multi-channel reproduction schemes. The signal interference caused by acoustic echo is distracting to users and causes a reduction in the quality of the communication. Striving for increased computational efficiency without performance loss, the integration of AEC into time-varying beamforming is examined for two broad classes of beamforming structures. Acoustic echo cancellation is a common occurrence in today’s telecommunication systems. Structural analysis shows that straightforward combinations of the two techniques either multiply the considerable computational cost of AEC by the number of array microphones or sacrifice algorithmic performance if the beamforming is time-varying. Two techniques, each one successful on its own, are combined here to jointly achieve maximum echo cancellation in real environments: For one, acoustic echo cancellation (AEC), which has matured for single-microphone signal acquisition, and, secondly, beamforming microphone arrays, which aim at dereverberation of desired local signals and suppression of local interferers, including acoustic echoes. Acoustic feedback from loudspeakers to microphones constitutes a major challenge for digital signal processing in interfaces for natural, full-duplex human-machine speech interaction.
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