Browsing by Author "Jiang, Guan-Yu"

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Nonlinear Acoustic Echo Cancellation Based on Higher Order Correlation
(2009)
Jiang, Guan-Yu
;
Hsieh, Shih-Fu
;
Jenq, Jang-Chyuan
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In order to compensate the nonlinearly distorted echo in hands-free telephone, a memoryless power-series polynomial nonlinear acoustic echo canceller (AEC) can be used. Conventional nonlinear AEC employs a NLMS adaptive algorithm which can fail to converge in case of doubletalk or a very noisy environment. In this paper we propose a higher order correlation algorithm using a white Gaussian training signal. With comparable complexity as NLMS, it is most effective at small SNR. Computer simulations demonstrate that the proposed algorithm has a smaller steady-state echo and it is also very robust to background noise.
Nonlinear acoustic echo cancellation using orthogonal polynomial
(2006)
Jiang, Guan-Yu
;
Hsieh, Shih-Fu
;
電信工程研究所
;
Institute of Communications Engineering
In order to compensate the nonlinear distortion in the hands -free telephones or teleconferencing system, a memoryless power- series-based polynomial NLMS adaptive filter can be used to cancel nonlinear acoustic echo. Conventional polynomial model employs a power-series expansion. In this paper we propose an orthogonal polynomial adaptive filter to accelerate the convergence rate of the nonlinear adaptive filter. The convergence rates of residual echo power for both power-series and orthogonal polynomials are derived analytically. Computer simulations justify our analysis and show the improved performance of the proposed nonlinear acoustic echo canceller.