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Non-native Pronunciation Modeling in a Command & Control Recognition Task : A Comparison between Acoustic and Lexical Modeling

In order to improve automatic recognition of English commands spoken by non-native speakers, we have modeled non-native pronunciation variation of Dutch, French and Italian. The results of lexical and acoustical modeling appeared to be source language and speaker dependent. Lexical modeling only resulted in a substantial improvement (of 35%) for the French speakers. Acoustic model adaptation halved the word error rates for the Italian speakers, whereas no improvements were found by lexical modeling of frequently observed Italian-accented non-native pronunciation variants. The performance for the Dutch speakers only slightly improved by lexical and acoustic modeling.