Enhancement of Spatial Clustering-Based Time-Frequency Masks using LSTM Neural Networks

• URL: http://arxiv.org/abs/2012.01576v1
• Date: Wed, 2 Dec 2020 22:29:29 GMT
• Title: Enhancement of Spatial Clustering-Based Time-Frequency Masks using LSTM Neural Networks
• Authors: Felix Grezes, Zhaoheng Ni, Viet Anh Trinh, Michael Mandel
• Abstract summary: We use LSTMs to enhance spatial clustering based time-frequency masks. We achieve both the signal modeling performance of multiple single-channel LSTM-DNN speech enhancers and the signal separation performance. We evaluate the intelligibility of the output of each system using word error rate from a Kaldi automatic speech recognizer.
• Score: 3.730592618611028
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent works have shown that Deep Recurrent Neural Networks using the LSTM architecture can achieve strong single-channel speech enhancement by estimating time-frequency masks. However, these models do not naturally generalize to multi-channel inputs from varying microphone configurations. In contrast, spatial clustering techniques can achieve such generalization but lack a strong signal model. Our work proposes a combination of the two approaches. By using LSTMs to enhance spatial clustering based time-frequency masks, we achieve both the signal modeling performance of multiple single-channel LSTM-DNN speech enhancers and the signal separation performance and generality of multi-channel spatial clustering. We compare our proposed system to several baselines on the CHiME-3 dataset. We evaluate the quality of the audio from each system using SDR from the BSS\_eval toolkit and PESQ. We evaluate the intelligibility of the output of each system using word error rate from a Kaldi automatic speech recognizer.

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