The NNI Vietnamese speech recognition system for MediaEval 2016

This paper provides an overall description of the Vietnamese speech recognition system developed by the joint team for MediaEval 2016. The submitted system consisted of 3 sub-systems, and adopted different deep neural network-based techniques such as fMLLR transformed bottleneck features, sequence training, etc. Besides the acoustic modeling techniques, speech data augmentation was also examined to develop a more robust acoustic model. The I²R team collected a number of text resources from the Internet and made them available to other participants in the task. The web text crawled from the Internet was used to train a 5-gram language model. The submitted system obtained the token error rate (TER) of 15.1, 23.0 and 50.5 on Devel local set, Devel set and Test set, respectively.