A unified convolutional beamformer for simultaneous denoising and dereverberation
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This paper proposes a method for estimating a convolutional beamformer that can perform denoising and dereverberation simultaneously in an optimal way. The application of dereverberation based on weighted prediction error (WPE) followed by denoising based on a minimum variance distortionless response beamformer (MVDR) has conventionally been considered a promising approach, however, the optimality of this approach is not guaranteed. To realize the optimal integration of denoising and dereverberation, we present a method that unifies WPE and a variant of MVDR, namely a minimum power distortionless response beamformer (MPDR), into a single convolutional beamformer, and we optimize it based on a single unified optimization criterion. The proposed beamformer is referred to as a Weighted Power minimization Distortionless response beamformer (WPD). Experiments show that the proposed method substantially improves the speech enhancement performance in terms of both objective speech enhancement measures and automatic speech recognition (ASR).
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