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

Volume

2

fYear

1994

fDate

3-5 Aug 1994

Firstpage

1424

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1994., Proceedings of the 37th Midwest Symposium on

Conference_Location

Lafayette, LA

Print_ISBN

0-7803-2428-5

Type

conf

DOI

10.1109/MWSCAS.1994.519074

Filename

519074