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IEICE TRANSACTIONS on Information

Consolidation-Based Speech Translation and Evaluation Approach

Chiori HORI, Bing ZHAO, Stephan VOGEL, Alex WAIBEL, Hideki KASHIOKA, Satoshi NAKAMURA

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Summary :

The performance of speech translation systems combining automatic speech recognition (ASR) and machine translation (MT) systems is degraded by redundant and irrelevant information caused by speaker disfluency and recognition errors. This paper proposes a new approach to translating speech recognition results through speech consolidation, which removes ASR errors and disfluencies and extracts meaningful phrases. A consolidation approach is spun off from speech summarization by word extraction from ASR 1-best. We extended the consolidation approach for confusion network (CN) and tested the performance using TED speech and confirmed the consolidation results preserved more meaningful phrases in comparison with the original ASR results. We applied the consolidation technique to speech translation. To test the performance of consolidation-based speech translation, Chinese broadcast news (BN) speech in RT04 were recognized, consolidated and then translated. The speech translation results via consolidation cannot be directly compared with gold standards in which all words in speech are translated because consolidation-based translations are partial translations. We would like to propose a new evaluation framework for partial translation by comparing them with the most similar set of words extracted from a word network created by merging gradual summarizations of the gold standard translation. The performance of consolidation-based MT results was evaluated using BLEU. We also propose Information Preservation Accuracy (IPAccy) and Meaning Preservation Accuracy (MPAccy) to evaluate consolidation and consolidation-based MT. We confirmed that consolidation contributed to the performance of speech translation.

Publication
IEICE TRANSACTIONS on Information Vol.E92-D No.3 pp.477-488
Publication Date
2009/03/01
Publicized
Online ISSN
1745-1361
DOI
10.1587/transinf.E92.D.477
Type of Manuscript
PAPER
Category
Speech and Hearing

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