Title :
Block transforms for cancellation of acoustic echoes
Author :
Li, Jingyun ; Yip, P.C.
Author_Institution :
Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada
Abstract :
The subband acoustic echo canceller is a good application of filter banks to eliminate the echo in teleconferencing and hands-free phone systems. Block transforms are successful implementation of filter banks. However, such filter bank systems also bring a new problem, frequency aliasing. In order to solve this new problem, we suggest adjusting the sampling rate in the block transform system. It is shown that by changing the sampling rate, the new scheme achieves a significant reduction of the echo level and solves the large computational problem
Keywords :
acoustic signal processing; adaptive filters; digital filters; echo suppression; filtering and prediction theory; teleconferencing; telephone systems; transforms; acoustic echoes cancellation; adaptive filters; block transforms; echo level reduction; filter banks; frequency aliasing; hands-free phone system; sampling rate; teleconferencing system; Acoustic applications; Adaptive filters; Digital filters; Digital signal processing; Echo cancellers; Filter bank; Frequency; Sampling methods; Signal sampling; Teleconferencing; Telephony;
Conference_Titel :
Signals, Systems and Computers, 1993. 1993 Conference Record of The Twenty-Seventh Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-4120-7
DOI :
10.1109/ACSSC.1993.342303
