Robustness of Zero-Shot Cross-Lingual Voice Cloning in Flow-Matching TTS Under Noisy and Adversarial Conditions

Abstract

Abstract: In this paper, we present X-Voice, a 0.4B multilingual zero-shot voice cloning model that clones arbitrary voices and enables everyone to speak 30 languages. X-Voice is trained on a 420K-hour multilingual corpus using the International Phonetic Alphabet (IPA) as a unified representation. To eliminate the reliance on prompt text without complex preprocessing like forced alignment, we design a two-stage training paradigm. In Stage 1, we establish X-Voice\$\_\text\s1\\\$ through standard conditional flow-matching training and use it to synthesize 10K hours of speaker-consistent segments as audio pr

Research Question

How does the robustness of zero-shot cross-lingual voice cloning in flow-matching TTS models vary when evaluated on noisy or adversarial input audio compared to diffusion-based and autoregressive models?

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