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Advanced Speech Recognition and Machine Translation Technology

AIXPLAIN AG focuses on statistical methods and modular software architecture for speech recognition, machine translation, and retrieval applications, such as multilingual retrieval and speech-to-speech translation. Current research areas include feature extraction, noise robustness, alignment templates, and incorporating syntactic knowledge in machine translation. The company has been involved in various research projects and success stories, including DARPA evaluations and commercial installations of speech recognition systems.

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Advanced Speech Recognition and Machine Translation Technology

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  1. Speech RecognitionandMachine Translation Stephan Kanthak s.kanthak@aixplain.de AIXPLAIN AG, Aachen, Germany

  2. Technology • Focus on Statistical Methods • Modular Software Architecture: • Speech Recognition • Machine Translation • Retrieval • Combined Applications: • Multilingual Retrieval • Retrieval of Multimedia Data • Speech-To-Speech Translation • ... • Original Mission: • Speech-To-Speech Translation (for Mobile Devices) Speech Recognition Machine Translation Knowledge Management

  3. Speech Recognition Preprocessing Search Acoustic Models Pronunciation Lexicon Language Model Result

  4. Speech Recognition: Current Research • Feature Extraction • Phase Information • Noise Robustness • Acoustic Models • Adaptation • Maximum Entropy Models • Discriminative Training • Multilingual Acoustic Models • Language Models • Class-Based Backing-Off Models • Open Vocabulary • Search • Weighted Finite-State Transducer • Dialogue Management • Reinforcement Learning

  5. MT: Alignment Templates Preprocessing Search Lexical Models Alignment Templates Language Model Postprocessing

  6. Machine Translation: Current Research • General • Incorporate Syntactic Knowledge • Improved Alignment Models • Context-Free Grammars • Phrase-Based Models • Language Models • Class-Based Backing-Off Models • Maximum Entropy Models • Search • Stochastic Parser • Weighted Finite-State Transducer

  7. Research Projects • At Lehrstuhl für Informatik VI • Current Projects: • PF-Star: Speech Translation • TransType2: Computer Assisted Translation • LC-Star: Lexica and Speech Corpora for Speech-To-Speech Translation • Completed Projects: • TC-Star_P: Preparation of TC-Star • CORETEX: Core Speech Recognition Technology • VERBMOBIL II: Speech-To-Speech Translation • Eutrans: Speech-To-Speech Translation • ADVISOR: Transcription of German Broadcast News and Retrieval of Videoclips • GIZA++: Open-Source Statistical Machine Translation

  8. Success Stories • Research Systems: • DARPA HUB4 Evaluation‘99: 4th best ASR system • VERBMOBIL: fastest and 2nd best ASR system • VERBMOBIL: best MT system • DARPA MT Evaluation‘02: best MT system • DARPA MT Evaluation‘03: 2nd best MT system • Production Systems: • Almost 200 speech recognition licenses sold in 2003 • Largest installation of a pick-by-voice system in Europe in December 2003

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