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Variable step-size NLMS algorithm for under-modeling acoustic echo cancellation
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DOI：10.1109/LSP.2007.910276.png)
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In acoustic echo cancellation (AEC) applications, where the acoustic echo paths are extremely long, the adaptive filter works most likely in an under-modeling situation. Most of the adaptive algorithms for AEC were derived assuming an exact modeling scenario, so that they do not take into account the under-modeling noise. In this letter, a variable step-size normalized least-mean-square (VSS-NLMS) algorithm suitable for the under-modeling case is proposed. This algorithm does not require any a priori information about the acoustic environment; as a result, it is very robust and easy to control in practice. The simulation results indicate the good performance of the proposed algorithm.
Keyword:
acoustic echo cancellation
adaptive filters
normalized least mean square (NLMS)
under-modeling system identification
variable step-size NLMS
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