最大化非均匀滤波器组信噪比的回声抵消方法
Maximizing the Signal-to-Alias Ratio in Non-Uniform Filter Banks for Acoustic Echo Cancellation
摘要：
提出了一种设计非均匀滤波器组的新方法。在该方法中，分析原型滤波器的设计框架作为一个凸优化问题，最大化的信号混叠比（SAR）的分析银行。由于每个子带具有不同的带宽，因此在优化期间考虑每个分析库对总体SAR的贡献。为了在优化过程中增加自由度，对滤波器的相位或群延迟不施加任何约束;同时，通过确保所得到的滤波器是最小相位来实现低延迟。实验结果表明，与现有的设计方法相比，该方法设计的滤波器组具有更好的回波损耗增强效果。
英文摘要：
A new method for designing non-uniform filter-banks for acoustic echo cancellation is proposed. In the method, the analysis prototype filter design is framed as a convex optimization problem that maximizes the signal-to-alias ratio (SAR) in the analysis banks. Since each sub-band has a different bandwidth, the contribution to the overall SAR from each analysis bank is taken into account during optimization. To increase the degrees of freedom during optimization, no constraints are imposed on the phase or group delay of the filters; at the same time, low delay is achieved by ensuring that the resulting filters are minimum phase. Experimental results show that the filter bank designed using the proposed method results in a sub-band adaptive filter with a much better echo return loss enhancement (ERLE) when compared with existing design methods.
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