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arXiv · 2512.04720

M3-TTS: Multi-modal DiT Alignment & Mel-latent for Zero-shot High-fidelity Speech Synthesis

Xiaopeng Wang·Chunyu Qiang·Ruibo Fu·Zhengqi Wen·Xuefei Liu·Yukun Liu·Yuzhe Liang·Kang Yin·Yuankun Xie·Heng Xie·Chenxing Li·Chen Zhang·Changsheng Li
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Abstract

Non-autoregressive (NAR) text-to-speech synthesis relies on length alignment between text sequences and audio representations, constraining naturalness and expressiveness. Existing methods depend on duration modeling or pseudo-alignment strategies that severely limit naturalness and computational efficiency. We propose M3-TTS, a concise and efficient NAR TTS paradigm based on multi-modal diffusion transformer (MM-DiT) architecture. M3-TTS employs joint diffusion transformer layers for cross-modal alignment, achieving stable monotonic alignment between variable-length text-speech sequences without pseudo-alignment requirements. Single diffusion transformer layers further enhance acoustic detail modeling. The framework integrates a mel-vae codec that provides 3* training acceleration. Experimental results on Seed-TTS and AISHELL-3 benchmarks demonstrate that M3-TTS achieves state-of-the-art NAR performance with the lowest word error rates (1.36\% English, 1.31\% Chinese) while maintaining competitive naturalness scores. Code and demos will be available at https://wwwwxp.github.io/M3-TTS.

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Xiaopeng Wang, Chunyu Qiang, Ruibo Fu, Zhengqi Wen, Xuefei Liu, Yukun Liu, Yuzhe Liang, Kang Yin, Yuankun Xie, Heng Xie, Chenxing Li, Chen Zhang, Changsheng Li. 2025-12-04. M3-TTS: Multi-modal DiT Alignment & Mel-latent for Zero-shot High-fidelity Speech Synthesis. https://arxiv.org/abs/2512.04720

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