DocumentCode :
2297936
Title :
Development of high quality acoustic subband echo canceller using dual-filter structure and fast recursive least squares algorithm
Author :
Wang, Youhua ; Terada, Yasuhiro ; Matsui, Minoru ; Iida, Kazumasa ; Nakayama, Kenji
Author_Institution :
Matsushita Commun., Japan
Volume :
6
fYear :
2000
fDate :
2000
Firstpage :
3674
Abstract :
A high quality acoustic subband echo canceller is developed based on a dual-filter structure and the fast recursive least squares (FRLS) algorithm. Methods for overcoming the instability problem of the FRLS algorithm and implementing it using the 32-bit fixed-point arithmetic are presented. A new tap-weight transfer method, which assures double talk detection, is proposed. Computer simulations demonstrate that fast convergence and fast tracking are achieved in an acoustic subband echo canceller using 32 subbands and a total of 4000-tap FIR filter for a 250 ms echo path. The combined use of the FRLS algorithm in the lowest eight frequency bands and the normalized least mean square (NLMS) algorithm in the rest of the frequency bands increases convergence rate for speech signals by five to ten times, and the echo return loss enhancement (ERLE) by more than 10 dB over those of using only the NLMS algorithm
Keywords :
FIR filters; acoustic signal processing; echo suppression; filtering theory; fixed point arithmetic; least squares approximations; recursive estimation; 250 ms; 32 bit; ERLE; FIR filter; FRLS algorithm; NLMS algorithm; computer simulations; convergence rate; double talk detection; dual-filter structure; echo path; echo return loss enhancement; fast convergence; fast recursive least squares algorithm; fast tracking; fixed-point arithmetic; frequency bands; high quality acoustic subband echo canceller; instability problem; mobile phone system; normalized least mean square; speech signals; tap-weight transfer method; teleconference system; Acoustic applications; Acoustic signal detection; Adaptive filters; Computer simulation; Convergence; Echo cancellers; Finite impulse response filter; Fixed-point arithmetic; Frequency; Least squares methods;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on
Conference_Location :
Istanbul
ISSN :
1520-6149
Print_ISBN :
0-7803-6293-4
Type :
conf
DOI :
10.1109/ICASSP.2000.860199
Filename :
860199
Link To Document :
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