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Robust Adaptive Beamformer for Speech Enhancement Using the Second-Order Extended $H_{infty}$ Filter

机译:使用二阶扩展$ H_ {infty} $滤波器进行语音增强的强大自适应波束形成器

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This paper presents a novel approach to implement the robust minimum variance distortionless response (MVDR) beamformer. The robust MVDR beamformer is based on the optimization of worst-case performance and provides an excellent robustness against an arbitrary but norm-bounded desired signal steering vector mismatch. For real-time consideration, the beamformer was formulated into state-space observer form and the second-order extended (SOE) Kalman filter was derived. However, the SOE Kalman filter assumes an accurate system dynamic and statistics of the noise signals. These assumptions limit the performance under uncertainties. This paper develops the SOE $ {H_{infty} } $ filter for the implementation of the robust MVDR beamformer. The estimation criterion in the SOE $ {H_{infty} } $ filter design is to minimize the worst possible effects of the disturbance signals on the signal estimation errors without a prior knowledge of the disturbance signals statistics. Experimental results demonstrate the performance of the proposed algorithm in a noisy and reverberant environment and show its superiority of the robustness against mismatches over the robust MVDR beamformer based on the SOE Kalman filter.
机译:本文提出了一种新颖的方法来实现鲁棒的最小方差无失真响应(MVDR)波束形成器。鲁棒的MVDR波束形成器基于最坏情况下的性能优化,并针对任意但受范数限制的期望信号控制向量失配提供了出色的鲁棒性。为了实时考虑,将波束形成器公式化为状态空间观察器形式,并推导了二阶扩展(SOE)卡尔曼滤波器。但是,SOE卡尔曼滤波器假定了准确的系统动态和噪声信号的统计信息。这些假设限制了不确定性下的性能。本文开发了SOE $ {H_ {infty}} $滤波器,用于实现强大的MVDR波束形成器。 SOE滤波器设计中的估计标准是在不事先了解干扰信号统计信息的情况下,将干扰信号对信号估计误差的最坏可能影响降至最低。实验结果证明了该算法在嘈杂和混响环境中的性能,并显示了其在基于SOE卡尔曼滤波器的鲁棒MVDR波束形成器上的抗失配鲁棒性。

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