Title: StreamUni: Achieving Streaming Speech Translation with a Unified Large Speech-Language Model
Primary area: applications to computer vision, audio, language, and other modalities
Keywords: Speech Translation, Streaming Speech Translation, Policy Decision, Speech Chain-of-Thought, Large Speech-Language Models

Abstract: Streaming speech translation (StreamST) requires determining appropriate timing, known as policy, to generate translations while receiving speech inputs, balancing low latency with high translation quality. However, existing StreamST methods typically operate on sentence-level speech segments, referred to as simultaneous speech translation (SimulST). In practice, they require collaboration with upstream truncation models to accomplish StreamST, where the truncated speech segments constrain SimulST models to make policy decisions and generate translations based on limited contextual information. Moreover, SimulST models struggle to learn effective policies due to the complexity of speech inputs and cross-lingual generation. To address these challenges, we propose StreamUni, which achieves StreamST through a unified Large Speech-Language Model (LSLM). Specifically, StreamUni incorporates speech Chain-of-Thought (CoT) in guiding the LSLM to generate multi-stage outputs. Leveraging these multi-stage outputs, StreamUni simultaneously accomplishes speech truncation, policy decision, and translation generation, completing StreamST without requiring massive policy-specific training. Additionally, we propose a streaming CoT training method that enhances low-latency policy decisions and generation capabilities using limited data. Experiments demonstrate that our approach achieves state-of-the-art performance on StreamST tasks.