This paper summarizes several follow-up contributions for improving our submitted NWPU speaker-dependent system for CHiME-5 challenge, which aims to solve the problem of multi-channel, highly-overlapped conversational speech recognition in a dinner party scenario with reverberations and non-stationary noises. We adopt a speaker-aware training method by using i-vector as the target speaker information for multi-talker speech separation. With only one unified separation model for all speakers, we achieve a 10\% absolute improvement in terms of word error rate (WER) over the previous baseline of 80.28\% on the development set by leveraging our newly proposed data processing techniques and beamforming approach. With our improved back-end acoustic model, we further reduce WER to 60.15\% which surpasses the result of our submitted CHiME-5 challenge system without applying any fusion techniques.
@article{arxiv.1904.03792,
title = {Improved Speaker-Dependent Separation for CHiME-5 Challenge},
author = {Jian Wu and Yong Xu and Shi-Xiong Zhang and Lian-Wu Chen and Meng Yu and Lei Xie and Dong Yu},
journal= {arXiv preprint arXiv:1904.03792},
year = {2019}
}