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arXiv 2102.05259eess.AS
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VACE-WPE:基于神经网络的语音去混响虚拟声道扩展

VACE-WPE: Virtual Acoustic Channel Expansion Based On Neural Networks for Weighted Prediction Error-Based Speech Dereverberation

Joon-Young Yang, Joon-Hyuk Chang

摘要:

语音去混响是许多实际语音处理应用中的一个重要问题。在所开发的技术中,加权预测误差(WPE)算法在过去十年中已被广泛采用和改进,该算法从麦克风信号的混响混合物中盲目地消除后期混响分量。在这项研究中,我们扩展了基于神经网络的虚拟声道扩展(VACE)框架的WPE为基础的语音去混响,WPE的变体,我们最近提出了使双通道WPE算法在单麦克风语音去混响的情况下使用。基于之前的研究,在离线处理场景中对VACE-WPE的成分进行了一些消融研究。这些研究有助于了解系统的动态,从而简化架构,并引入新的策略来训练VCE的神经网络。在嘈杂的混响环境中的实验结果表明,VACE-WPE大大优于其单通道对应的客观语音质量和互补的单通道WPE时,作为前端的远场自动语音识别器。

英文摘要:

Speech dereverberation is an important issue for many real-world speech processing applications. Among the techniques developed, the weighted prediction error (WPE) algorithm has been widely adopted and advanced over the last decade, which blindly cancels out the late reverberation component from the reverberant mixture of microphone signals. In this study, we extend the neural-network-based virtual acoustic channel expansion (VACE) framework for the WPE-based speech dereverberation, a variant of the WPE that we recently proposed to enable the use of dual-channel WPE algorithm in a single-microphone speech dereverberation scenario. Based on the previous study, some ablation studies are conducted regarding the constituents of the VACE-WPE in an offline processing scenario. These studies help understand the dynamics of the system, thereby simplifying the architecture and leading to the introduction of new strategies for training the neural network for the VACE. Experimental results in noisy reverberant environments reveal that VACE-WPE considerably outperforms its single-channel counterpart in terms of objective speech quality and is complementary to the single-channel WPE when employed as the front-end for the far-field automatic speech recognizer.

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