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Diagonal loading provides a powerful and effective way to improve the robustness of the standard Capon beamformer. Several parameter-free robust adaptive beamformers (RAB) are considered in this paper. We reveal that the performances of them have somewhat degradation when the number of snapshots or that of sensors is large. To solve this problem, we emphatically study the well-known generalized linear...
After revealing that both late reverberation and noise are additive interference components in the residual domain, this paper proposes to suppress these additive interference components by using a constrained minimum mean square error linear prediction (LP) residual estimator, where the optimal filter can be obtained by the generalized singular value decomposition. We propose to estimate the LP residuals...
For two nearby microphones, adaptive null-forming (ANF) scheme is a simple and effective algorithm for suppressing directional noise sources. In this paper, we analyze the robustness of the time-domain ANF (TD-ANF) and the frequency-domain ANF (FD-ANF) schemes in theory. The analysis reveals several distinctive phenomena. First, the two ANF schemes reduce the amount of interference-plus-noise reduction...
This paper studies the statistical properties of the gain functions, which are often used for two-channel post-filtering (TC-PF) algorithms. We reveal that the smoothing factor has a significant impact on both noise reduction and musical noise. When the smoothing factor increases, noise reduction can be improved and musical noise can be reduced simultaneously. However, the smoothing factor could not...
This paper proposed a method for noise reduction to DCSK communications systems using weighted least square support vector machine (WLS-SVM). By exploiting the chaotic dynamics involved, the short-term robust estimation of chaotic signals can be obtained by first using a support vector machine with a least squares cost function and, then associating weighted values to the error variables based upon...
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