Author

Koki Nikaido

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Preprint Oct 2026

Pronunciation-Oriented Reinforcement Learning for Japanese Text-to-Speech with Kana-Domain ASR Rewards

Character error rate (CER) computed by automatic speech recognition (ASR) is widely used as an intelligibility reward for reinforcement learning (RL) post-training of text-to-speech (TTS) systems. For Japanese, however, orthographic CER introduces a representation mismatch for pronunciation-oriented optimization: disti...

Shi-Yue Zhu, Lian-Bo Liu, Kai Washizaki et al. · 0 citations

#natural language process... Preprint Oct 2026

Factorized Delayed Streams Modeling for LLM-based Streaming ASR

Factorized DSM is proposed, which separates the waiting probability for ASR-specific tokens from the text prediction space and allows the large-vocabulary softmax to be skipped on waiting steps and greatly reduces GPU memory use while maintaining similar training throughput.

Tatsunari Takagi, Kai Washizaki, Atsushi Kojima et al. · 0 citations