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arXiv 2002.04027cs.SDeess.AS
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基于深度学习的语音增强跨语料泛化研究

On Cross-Corpus Generalization of Deep Learning Based Speech Enhancement

The Ohio State University(俄亥俄州立大学)

Ashutosh Pandey, DeLiang Wang

摘要:

近年来,使用深度神经网络(DNN)的监督方法已经成为语音增强的主流。已经确定的是,如果使用大量的噪声和扬声器进行训练,DNN可以很好地推广到未经训练的噪声和扬声器。然而,我们发现DNN未能推广到新的语音语料库在低信噪比(SNR)条件。在这项工作中,我们确定缺乏泛化主要是由于通道失配,即训练和未训练语料库之间的不同记录条件。此外,我们观察到,传统的通道归一化技术在提高跨语料库泛化方面是无效的。此外,我们评估了有希望推广的公开数据集。我们发现一个特定的语料库明显优于其他语料库。最后,我们发现在语音的短时处理中使用较小的帧移可以显著提高跨语料库的泛化能力。提出的解决跨语料泛化的技术包括通道归一化、更好的训练语料和短时傅立叶变换(STFT)中较小的帧移位。这些技术共同提高了未经训练的语料库的客观可懂度和质量分数显着。

英文摘要:

In recent years, supervised approaches using deep neural networks (DNNs) have become the mainstream for speech enhancement. It has been established that DNNs generalize well to untrained noises and speakers if trained using a large number of noises and speakers. However, we find that DNNs fail to generalize to new speech corpora in low signal-to-noise ratio (SNR) conditions. In this work, we establish that the lack of generalization is mainly due to the channel mismatch, i.e. different recording conditions between the trained and untrained corpus. Additionally, we observe that traditional channel normalization techniques are not effective in improving cross-corpus generalization. Further, we evaluate publicly available datasets that are promising for generalization. We find one particular corpus to be significantly better than others. Finally, we find that using a smaller frame shift in short-time processing of speech can significantly improve cross-corpus generalization. The proposed techniques to address cross-corpus generalization include channel normalization, better training corpus, and smaller frame shift in short-time Fourier transform (STFT). These techniques together improve the objective intelligibility and quality scores on untrained corpora significantly.

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