Speech recognition of foreign out-of-vocabulary words using a hierarchical language model

Hirofumi Yamamoto, Genichiro Kikui, Satoshi Nakamura, Yoshinori Sagisaka

研究成果: Conference contribution

抄録

This paper proposes a new speech recognition scheme for foreign out-of-vocabulary words embedded in native-language speech. To recognize foreign names frequently observed in news speech or in translation speech, we adopted a hierarchical language model that had been successfully applied to OOV words covering native vocabularies. In this hierarchical language model, OOV vocabularies are modeled as a word-class model in the upper-layered model, and their statistical phonotactic constraints are modeled in the lower-layered model. Since extra statistics are needed to cover foreign words and their pronunciation differences, we have introduced two techniques. The first is to combine translation target language models and translation source statistics of OOVs using the hierarchical language model. The second is to automatically generate recognition target pronunciations from original pronunciations by syllable-to-syllable mapping. To confirm the validity of this recognition scheme, we have conducted speech recognition experiments using English speech including Japanese personal names as OOV words. The proposed method outperformed the existing algorithm using a lexicon consisting of all the words in the training set. Surprisingly, it achieved better OOV recognition results than the non-OOV condition where all the proper names in the test set are registered in the lexicon.

本文言語English
ホスト出版物のタイトルINTERSPEECH 2006 and 9th International Conference on Spoken Language Processing, INTERSPEECH 2006 - ICSLP
出版社International Speech Communication Association
ページ1870-1873
ページ数4
ISBN(印刷版)9781604234497
出版ステータスPublished - 2006 1 1
イベントINTERSPEECH 2006 and 9th International Conference on Spoken Language Processing, INTERSPEECH 2006 - ICSLP - Pittsburgh, PA, United States
継続期間: 2006 9 172006 9 21

出版物シリーズ

名前INTERSPEECH 2006 and 9th International Conference on Spoken Language Processing, INTERSPEECH 2006 - ICSLP
4

Conference

ConferenceINTERSPEECH 2006 and 9th International Conference on Spoken Language Processing, INTERSPEECH 2006 - ICSLP
CountryUnited States
CityPittsburgh, PA
Period06/9/1706/9/21

ASJC Scopus subject areas

  • Computer Science(all)

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