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A Collaborative Spline Adaptive Filter for Nonlinear Echo Cancellation

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Abstract

Acoustic echo causes the quality of communication to degenerate and results in loss of clarity. Though conventional linear adaptive filters have been applied successfully to eliminate linear acoustic echo, they can barely deal with the problem of nonlinear acoustic echo. In this paper, a collaborative spline adaptive filter is presented to eliminate nonlinear acoustic echo. The filter is composed of a linear adaptive filter in the upper branch and a nonlinear spline adaptive filter in the lower branch. The nonlinear one is a Hammerstein system consisting of a spline interpolation function and a subsequent linear adaptive filter. The two branches are collaboratively combined and a mixing parameter is adopted, which can be updated to adjust the proportion of the lower branch output signal. Experimental results show that the presented method can achieve a good performance in nonlinear echo cancelation regardless of whether the nonlinear degree of the echo path varies with time or not.

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Some or all data, models, or code generated or used during the study are available from the corresponding author by request (List items).

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Acknowledgements

This work was in part supported by a research grant provided by a Project Funded III by the Priority Academic Program Development of Jiangsu Higher Education Institutions, National Natural Science Foundation of China (61871230), Jiangsu Natural Science Foundation (BK20181410), Undergraduate Innovation Project (201910300181).

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Authors and Affiliations

  1. School of Electronic and Information Engineering, Nanjing University of Information Science and Technology, Nanjing, China

    Yi-Bo Zhao, Tao Yan, Wen-Yuan Chen & Hao-Zhi Lu

  2. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Yi-Bo Zhao, Tao Yan, Wen-Yuan Chen & Hao-Zhi Lu

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  1. Yi-Bo Zhao
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  2. Tao Yan
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Correspondence to Yi-Bo Zhao.

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Zhao, YB., Yan, T., Chen, WY. et al. A Collaborative Spline Adaptive Filter for Nonlinear Echo Cancellation. Circuits Syst Signal Process 40, 1699–1719 (2021). https://doi.org/10.1007/s00034-020-01544-1

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