Recognition of utterances with grammatical mistakes based on optimization of language model towards interactive CALL systems

Takuya Anzai, Akinori Ito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

To realize a voice-interactive CALL system, it is necessary to recognize the learner's utterance correctly including the grammatical mistakes. In this paper, we proposed methods for improving recognition accuracy of speech with grammatical mistakes. The proposed method is based on the method that uses n-gram model trained from sentences that are generated using grammatical error rules. We introduced two improvements to the previous method: one is the utterance discrimination to avoid introducing errors into correct utterances, and the other one is optimization of language model where probability of grammatical mistakes in the generated training text is optimized using the score of utterance discrimination. As a result, we obtained 0.92 point improvement, which is 12% error reduction.

Original languageEnglish
Title of host publication2012 Conference Handbook - Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2012
Publication statusPublished - 2012 Dec 1
Event2012 4th Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2012 - Hollywood, CA, United States
Duration: 2012 Dec 32012 Dec 6

Publication series

Name2012 Conference Handbook - Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2012

Other

Other2012 4th Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2012
CountryUnited States
CityHollywood, CA
Period12/12/312/12/6

Keywords

  • grammatical mistakes
  • interactive CALL system
  • language model
  • speech recognition

ASJC Scopus subject areas

  • Information Systems

Cite this

Anzai, T., & Ito, A. (2012). Recognition of utterances with grammatical mistakes based on optimization of language model towards interactive CALL systems. In 2012 Conference Handbook - Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2012 [6411788] (2012 Conference Handbook - Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA ASC 2012).