International Workshop on Spoken Language Translation (IWSLT) 2011
San Francisco, CA, USA
In this paper, we describe NICT's participation in the IWSLT
2011 evaluation campaign for the ASR Track.
To recognize spontaneous speech, we prepared an acoustic model trained by more spontaneous speech corpora and a language model constructed with text corpora distributed by the organizer. We built the multi-pass ASR system by adapting the acoustic and language models with previous ASR results.
The target speech was selected from talks on the TED (Technology, Entertainment, Design) program. Here, a large reduction in word error rate was obtained by the speaker adaptation of the acoustic model with MLLR. Additional improvement was achieved not only by adaptation of the language model but also by parallel usage of the baseline and speaker-dependent acoustic models. Accordingly, the final WER was reduced by 30% from the baseline ASR for the distributed test set.
Bibliographic reference. Abe, Kazuhiko / Wu, Youzheng / Huang, Chien-lin / Dixon, Paul R. / Matsuda, Shigeki / Hori, Chiori / Kashioka, Hideki (2011): "The NICT ASR system for IWSLT2011", In IWSLT-2011, 28-33.