The CMU TransTac 2007 eyes-free two-way speech-to-speech translation system Nguyen Bach author Matthais Eck author Paisarn Charoenpornsawat author Thilo Köhler author Sebastian Stüker author ThuyLinh Nguyen author Roger Hsiao author Alex Waibel author Stephan Vogel author Tanja Schultz author Alan W Black author 2007-oct 15-16 text Proceedings of the Fourth International Workshop on Spoken Language Translation Trento, Italy conference publication bach-etal-2007-cmu https://aclanthology.org/2007.iwslt-1.4/ 2007-oct 15-16