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arXiv · 2510.05799

Data-efficient Targeted Token-level Preference Optimization for LLM-based Text-to-Speech

Rikuto Kotoge·Yuichi Sasaki
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Abstract

Aligning text-to-speech (TTS) system outputs with human feedback through preference optimization has been shown to effectively improve the robustness and naturalness of language model-based TTS models. Current approaches primarily require paired desirable and undesirable samples at the utterance level. However, such pairs are often limited in TTS output data, and utterance-level formulation prevents fine-grained token-level optimization needed for accurate pronunciation alignment. In this study, we propose TKTO that eliminates the need for paired data, enabling a more data-efficient training paradigm, and directly targets token-level units, automatically providing fine-grained alignment signals without token-level annotations. TKTO improves the challenging Japanese TTS accuracy by 39% and reduces CER by 54%, automatically assigning 12.8 times stronger reward to targeted tokens.

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BibTeXRIS

Rikuto Kotoge, Yuichi Sasaki. 2025-10-07. Data-efficient Targeted Token-level Preference Optimization for LLM-based Text-to-Speech. https://arxiv.org/abs/2510.05799

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