Wave-domain canceling of residual echo with subspace tracking

For full-duplex immersive audio communication with wave field reconstruction, efficient echo canceling is required, and wave-domain adaptive filtering techniques have been developed. We show that in a linear array case, the spatial transformation to the wave domain can be interpreted as delay-and-sum beamforming. Based on this interpretation, we propose to take into account the reflection of dominant reproduced waves extracted by subspace tracking in order to improve the performance of residual echo canceling.