Abstract
AbstractIn this paper, a method using a subadaptive filter playing the supplementary role of acoustic echo cancellation is discussed. Since the updating state of the adaptive filter can be calculated approximately as a characteristic of the subadaptive filter, the step size parameter can be optimally controlled depending on the estimation accuracy. Also, for prevention of echo path variation, we discuss a variable detector in which the variation of the filter coefficients at the time of variation is considered. The proposed method is found to be robust to channel variations and can improve the ERLE by 10 to 15 dB in comparison with the conventional method. © 2006 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 90(2): 9–21, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20231
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