An improved subband acoustic echo canceller for teleconferencing applications

In this paper a novel subband acoustic echo canceller (AEC) is proposed. The proposed scheme consists in 8 non-overlapping main subbands and 8 auxiliary subbands. The auxiliary subbands are introduced in order to provide frequency coverage in the non-overlapping region between the neighboring main subbands. Central to computational efficiency of the proposed scheme is the decimation of the auxiliary bands. Simulation results provided show that the proposed subband AEC has faster convergence speed for tracking acoustic echo path as well as better dB reduction in the echo level in comparison to overlapping subband schemes.