A stable and efficient DSP implementation of a LSL algorithm for acoustic echo cancelling

Author

Carezia, André ; Burt, Phillip M S ; Gerken, Max ; Miranda, Maria D. ; Da Silva, Magno T M

Author_Institution

Dept. of Telecommun. & Control Eng., Polytech. Sch./Univ. of Sao Paulo, Brazil

Volume

2

fYear

2001

fDate

2001

Firstpage

921

Abstract

We present an optimized DSP implementation of a modified error-feedback lattice least-square (EF-LSL) adaptive filtering algorithm. Simple measures that provide numerical stability for poor persistent excitation are also proposed. As a result of the optimization and the stability measures, an efficient and stable implementation of a fast algorithm of the RLS family was attained. We present the results of an acoustic echo cancelling experiment performed with the implemented algorithm. With a 40 MIPS SHARC DSP, up to 290 adaptive filter coefficients can be used. This represents an effective alternative to algorithms of the LMS family, while still retaining the good convergence properties of the RLS family

Keywords

circuit feedback; digital signal processing chips; echo suppression; lattice filters; least squares approximations; numerical stability; recursive filters; 40 MIPS; LSL algorithm; RLS; SHARC DSP; acoustic echo cancellation; adaptive filter coefficients; assembly language; convergence properties; efficient fast algorithm; error-feedback filtering algorithm; lattice least-square adaptive filtering; numerical stability; optimization; optimized DSP implementation; stability measures; stable fast algorithm; Acoustic measurements; Adaptive filters; Computational complexity; Convergence; Digital signal processing; Feedback; Lattices; Least squares approximation; Resonance light scattering; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on

Conference_Location

Salt Lake City, UT

ISSN

1520-6149

Print_ISBN

0-7803-7041-4

Type

conf

DOI

10.1109/ICASSP.2001.941066

Filename

941066