Computationally efficient frequency-domain combination of acoustic echo cancellation and robust adaptive beamforming

For hands-free acoustical human/machine interfaces, e. g. for automatic speech recognition or teleconferencing systems, microphone arrays using robust Generalized Sidelobe Cancellers (GSCs) in conjunction with acoustic echo cancellation (AEC) can be efficiently applied for optimum communication. This contribution devises a new structure for combining AEC and GSC. It reduces the computational complexity by more than a factor of ten relative to a time-domain arrangement, increases convergence speed, and preserves positive synergies.