WANG Xuyang, ZHANG Pengyuan, NA Xingyu, PAN Jielin, YAN Yonghong. Handling OOV Words in Mandarin Spoken Term Detection with an Hierarchical n-Gram Language Model[J]. Chinese Journal of Electronics, 2017, 26(6): 1239-1244. doi: 10.1049/cje.2017.07.004
Citation: WANG Xuyang, ZHANG Pengyuan, NA Xingyu, PAN Jielin, YAN Yonghong. Handling OOV Words in Mandarin Spoken Term Detection with an Hierarchical n-Gram Language Model[J]. Chinese Journal of Electronics, 2017, 26(6): 1239-1244. doi: 10.1049/cje.2017.07.004

Handling OOV Words in Mandarin Spoken Term Detection with an Hierarchical n-Gram Language Model

doi: 10.1049/cje.2017.07.004
Funds:  This work is supported by the National Natural Science Foundation of China (No.11461141004, No.61271426, No.11504406, No.11590770, No.11590771, No.11590772, No.11590773, No.11590774), the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA06030100, No.XDA06030500, No.XDA06040603), National 863 Program (No.2015AA016306), National 973 Program (No.2013CB329302) and the Key Science and Technology Project of the Xinjiang Uygur Autonomous Region (No.201230118-3).
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  • Corresponding author: ZHANG Pengyuan (corresponding author) received the Ph.D. degree in information and signal processing from Institute of Acoustics, Chinese Academy of Sciences, in 2007. From 2013 to 2014, he was a research scholar of University of Sheffield. (Email:zhangpengyuan@hccl.ioa.ac.cn)
  • Received Date: 2015-08-28
  • Rev Recd Date: 2015-12-24
  • Publish Date: 2017-11-10
  • In this paper, an hierarchical n-gram Language model (LM) combining words and characters is explored to improve the detection of Out-of-vocabulary (OOV) words in Mandarin Spoken term detection (STD). The hierarchical LM is based on a word-level LM, with a character-level LM estimating probabilities of OOV words in a class-based way. The region containing OOV words in the sentence to be decoded is detected with the help of the word-level LM and the probabilities of OOV words are derived from the character-level LM. The implementation of the proposed approach is based on a dynamic decoder. The proposed approach is evaluated in terms of Actual term weighted value (ATWV) on two Mandarin data sets. Experiment results show that more than 10% relative improvement for OOV word detection is achieved on both sets. In addition, the detection of In-vocabulary (IV) words is barely influenced as well.
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