Multi-stage speech enhancement for automatic speech recognition

In this paper, we propose a multi-stage speech enhancement technique for speech recognition. At first, a multi-channel speech enhancement method takes advantage of the spatial information of speech source. Then, in the second stage, single-channel speech enhancement based on data-driven approach is adopted to improve performance of speech recognition at server side. This method can improve the quality of speech signal which maximizes the advantage of each speech enhancement technique. The experimental result shows that the proposed technique is superior to conventional multi-stage speech enhancement algorithms.