Browsing by Author "Jenq, Jang-Chyuan"

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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.
Two-Staged Nonlinear Acoustic Echo Cancellation and Its Convergence Analysis
(2009)
Li, Ko-Chiang
;
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
Hand-free telephone system commonly drives the power-amplification and loudspeaker into saturated nonlinear region such that performance of conventional acoustic echo cancellation (AEC) is degraded. A computationally efficient cascade AEC model is used to include a memoryless piecewise linear (PWL) processor and a linear filter. In order to overcome the start-up divergence problem encountered in nonlinear AEC adaptation, a two-stage update scheme is adopted that starts with the linear filter update, and then joint adaptation of PWL and linear coefficients follows. Theoretical convergence analysis and stability criterion will be derived and validated by the computer simulation.