A New Frequency Domain Implementation of ECLMS Algorithm for Double-Talk Echo Canceling

概要

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In the echo canceling for hand-free set mobile radiotelephone or teleconference system, the double-talk is occurred when both the near-end and the far-end speakers talk simultaneously. The conventional adaptive digital FIR filter using algorithm such as LMS fails to track the echo path in this condition. Because the error signal is contaminated to the near-end signal to estimate the gradient correctly. The Extended Correlation LMS (ECLMS) algorithm has been introduced by authors to challenge the double-talk in the echo canceling system. Here, the gradient search algorithm is obtained from the correlation function and the error lags between autocorrelation and cross-correlation values of the near and the far end signals. To reduce the computational load of the ECLMS algorithm, the frequency domain version of the algorithm has also previously been defined by the authors but the performance was not appropriate. In this paper, to implement the exact linear convolution in the frequency domain a new fast implementation of the ECLMS algorithm by using zero padding and Half Overlapped Save (HOS) method has been proposed. Also the correlation values are calculated directly in the frequency domain. The computer simulation results support the theoretical findings and verify the robustness of the proposed FBECLMS algorithm in the double-talk situation.
琉球大学工学部の論文