Statistical Translation of Text and Speech: First Results with the RWTH System

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In this paper, we describe a first version of a system for statistical translation and present experimental results. The statistical translation approach uses two types of information: a translation model and a language model. The language model used is a standard bigram model. The translation model is decomposed into lexical and alignment models. After presenting the details of the alignment model, we describe the search problem and present a dynamic programming-based solution for the special case of monotone alignments. So far, the system has been tested on two limited-domain tasks for which a bilingual corpus is available: the EuTrans traveller task (Spanish–English, 500-word vocabulary) and the Verbmobil task (German–English, 3000-word vocabulary). We present experimental results on these tasks. In addition to the translation of text input, we also address the problem of speech translation and suitable integration of the acoustic recognition process and the translation process.

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