JANUS-II is a research system for investigating various issues in speech-to-speech translations and has been implemented for speech-to-speech translations on many languages [1]. In this paper, we address the Spanish speech recognition part of JANUS-II. First, we report the bootstrap and optimization of the recognition system. Then we investigate the di erence between push-to-talk and cross-talk dialogs, which are two di erent kinds of data in our database. We give a detail noise analysis for the push-to-talk and cross-talk dialogs and present some recognition results for the comparison. Wehave observed that the cross-talk dialogs are harder than the pushto-talk dialogs for speech recognition, because they are more noisy than the latter. Currently, the error rate of our Spanish recognizer is 27 % for push-to-talk test set and 32 % for crosstalk test set. 1.

JANUS-II is a research system to design and test components of speech-to-speech translation systems as well as a research prototype for such a system. We will focus on two aspects of the system: 1) new features of the speech recognition component JANUS-SR, 2) the end-to-end performance of JANUS-II, including a comparison of two machine translation strategies used for JANUS-MT (PHOENIX and GLR*). 1. INTRODUCTION Currently JANUS-II components for English, German, Korean, Japanese, and Spanish speech input and translation are under development; though not all language pairs can always be kept at the same performance level, multilinguality is required to ensure generality in the recognition and translation approaches. A number of smaller and larger scale research projects contribute to the JANUS-II system [1], including language identification [2], robust speech recognition [3], recognition speed [4], noise modeling [5], new word modeling [6], portability to new languages [7], language mo...

JANUS-II is a research system for investigating various issues in speech-to-speech translations and has been implemented for speech-to-speech translations on many languages [1]. In this paper, we address the Spanish speech recognition part of JANUS-II. First, we report the bootstrap and optimization of the recognition system. Then we investigate the difference between push-to-talk and cross-talk dialogs, which are two different kinds of data in our database. We give a detail noise analysis for the push-to-talk and cross-talk dialogs and present some recognition results for the comparison. We have observed that the cross-talk dialogs are harder than the pushto -talk dialogs for speech recognition, because they are more noisy than the latter. Currently, the error rate of our Spanish recognizer is 27% for push-to-talk test set and 32% for crosstalk test set. 1. Introduction Today, most of the state of the art speech recognition systems are based on Hidden Markov Model (HMM) techniques, ...