arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.00570cs.SDeess.AS
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利用低失真目标估计改进语音增强

Leveraging Low-Distortion Target Estimates for Improved Speech Enhancement

Mitsubishi Electric Research Laboratories (MERL)(三菱电机研究实验室);Carnegie Mellon University(卡内基梅隆大学)

Zhong-Qiu Wang, Gordon Wichern, Jonathan Le Roux

摘要:

多麦克风语音分离的一种有前途的方法涉及两个深度神经网络(DNN),其中来自第一个DNN的预测目标语音用于计算时不变最小方差无失真响应(MVDR)波束成形的信号统计,然后MVDR结果用作第二个DNN的额外特征以预测目标语音。以往的研究表明,MVDR结果可以为第二个DNN提供补充信息,以更好地预测目标语音。然而,在固定几何阵列上,两个DNN都可以将例如多通道混合的实部和虚部(RI)分量作为特征来利用空间和频谱信息进行增强。考虑到DNN和波束形成器使用相同的输入,并且DNN执行非线性滤波并且可能使得MVDR的线性滤波不必要,没有清楚地解释为什么线性MVDR结果可以是互补的以及为什么仍然需要它。类似地,在单声道情况下,可以用单声道加权预测误差(WPE)滤波器来代替MVDR波束形成器。虽然线性WPE滤波器和DNN使用相同的混合RI分量作为输入,但发现WPE结果显著改善了第二DNN。这项研究提供了一个新的解释,从这种算法的低失真性质的角度来看,并发现他们可以不断提高相位估计。有了这样的理解,我们研究了几种低失真的目标估计算法,包括几个波束形成器,WPE,前向卷积预测,以及它们的组合,并使用它们的结果作为额外的功能,训练第二个网络,以实现更好的增强。单麦克风和多麦克风语音去混响和增强任务的评估结果表明,所提出的方法的有效性,所提出的观点的有效性。

英文摘要:

A promising approach for multi-microphone speech separation involves two deep neural networks (DNN), where the predicted target speech from the first DNN is used to compute signal statistics for time-invariant minimum variance distortionless response (MVDR) beamforming, and the MVDR result is then used as extra features for the second DNN to predict target speech. Previous studies suggested that the MVDR result can provide complementary information for the second DNN to better predict target speech. However, on fixed-geometry arrays, both DNNs can take in, for example, the real and imaginary (RI) components of the multi-channel mixture as features to leverage the spatial and spectral information for enhancement. It is not explained clearly why the linear MVDR result can be complementary and why it is still needed, considering that the DNNs and the beamformer use the same input, and the DNNs perform non-linear filtering and could render the linear filtering of MVDR unnecessary. Similarly, in monaural cases, one can replace the MVDR beamformer with a monaural weighted prediction error (WPE) filter. Although the linear WPE filter and the DNNs use the same mixture RI components as input, the WPE result is found to significantly improve the second DNN. This study provides a novel explanation from the perspective of the low-distortion nature of such algorithms, and finds that they can consistently improve phase estimation. Equipped with this understanding, we investigate several low-distortion target estimation algorithms including several beamformers, WPE, forward convolutive prediction, and their combinations, and use their results as extra features to train the second network to achieve better enhancement. Evaluation results on single- and multi-microphone speech dereverberation and enhancement tasks indicate the effectiveness of the proposed approach, and the validity of the proposed view.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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