Paper details

Abstract: Due to the properties of an acoustic enclosure, the early part (i.e., direct path and early reflections) of the acoustic echo path is sparse while the late reverberant part of the acoustic path is dispersive. In this contribution, an adaptive filter structure that consists of two time-domain partition blocks is used such that different adaptive algorithms can be used for each part. Specifically, the improved proportionate normalized least-mean-square (IPNLMS) algorithm is used for which the filter update is a combination of non-proportioned and proportionated updates. By properly controlling the mixing parameter for the partitioned blocks separately, the proposed partitioned block IPNLMS (PB-IPNLMS) algorithm works well in both sparse and dispersive circumstances and in practical applications involving time-varying systems. Simulation results using a white Gaussian noise (WGN) sequence show improved performance compared to using a single IPNLMS adaptive filter.

Status: Published in Proc. of the APSIPA Annual Summit and Conference 2010, Biopolis, Singapore, Dec 2010.

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