Improving bottleneck features for Vietnamese large vocabulary continuous speech recognition system using deep neural networks

Bao Quoc Nguyen, Thang Tat Vu, Mai Chi Luong


In this paper, the pre-training method based on denoising auto-encoder is investigated and proved to be good models for initializing bottleneck networks of Vietnamese speech recognition system that result in better recognition performance compared to base bottleneck features reported previously. The experiments are carried out on the dataset containing speeches on Voice of Vietnam channel (VOV). The results show that the DBNF extraction for Vietnamese recognition decreases relative word error rate by 14 % and 39 % compared to the base bottleneck features and MFCC baseline, respectively.


Deep bottleneck features, neural network, Vietnamese speech recognition.

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Journal of Computer Science and Cybernetics ISSN: 1813-9663

Published by Vietnam Academy of Science and Technology