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arXiv · 2609.02623

Scalable Direction-Following TTS via Voice Impression-Guided Pseudo Triplet Construction

Kenichi Fujita·Yusuke Ijima
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Abstract

Voice actors often re-read the same script while modifying their delivery in response to performance directions. We study this setting as direction-following TTS, where a system generates a new utterance that reflects a given direction relative to a reference utterance while preserving speaker identity and linguistic content. A key challenge is the lack of training data capturing such relative modifications. To address this, we propose a scalable pseudo-triplet construction pipeline that generates~(reference utterance, direction text, modified utterance) triplets. It generates controlled style variations using an impression-controllable TTS model and uses an LLM to produce natural language directions from estimated impression differences. Experimental results demonstrate that pseudo-triplets alone enable stable speaker-preserving modification, and that combining pseudo and recorded data further improves direction alignment while maintaining speaker similarity. Audio examples are available on our demo page https://ntt-hilab-gensp.github.io/IS2026pseudo/

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Kenichi Fujita, Yusuke Ijima. 2026-09-02. Scalable Direction-Following TTS via Voice Impression-Guided Pseudo Triplet Construction. https://arxiv.org/abs/2609.02623

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