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A new method for designing non-uniform filter-banks for acoustic echocancellation is proposed. In the method, the analysis prototype filter designis framed as a convex optimization problem that maximizes the signal-to-aliasratio (SAR) in the analysis banks. Since each sub-band has a differentbandwidth, the contribution to the overall SAR from each analysis bank is takeninto account during optimization. To increase the degrees of freedom duringoptimization, no constraints are imposed on the phase or group delay of thefilters; at the same time, low delay is achieved by ensuring that the resultingfilters are minimum phase. Experimental results show that the filter bankdesigned using the proposed method results in a sub-band adaptive filter with amuch better echo return loss enhancement (ERLE) when compared with existingdesign methods.

Maximizing the Signal-to-Alias Ratio in Non-Uniform Filter Banks for Acoustic Echo Cancellation