Title :
An improved subband acoustic echo canceller for teleconferencing applications
Author :
Tahernezhadi, M. ; Liu, J. ; Kong, X.
Author_Institution :
Dept. of Electr. Eng., Northern Illinois Univ., DeKalb, IL, USA
Abstract :
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
Keywords :
adaptive filters; adaptive signal processing; echo suppression; speech processing; teleconferencing; acoustic echo path trapping; adaptive structure; auxiliary subbands; computational efficiency; convergence speed; critical down sampling; frequency coverage; nonoverlapping main subbands; simulation results; subband acoustic echo canceller; teleconferencing; Acoustic applications; Computational efficiency; Computational modeling; Convergence; Degradation; Echo cancellers; Filter bank; Finite impulse response filter; Frequency; Signal processing algorithms; Teleconferencing;
Conference_Titel :
Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on
Conference_Location :
Lafayette, LA
Print_ISBN :
0-7803-2428-5
DOI :
10.1109/MWSCAS.1994.519074
