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arXiv · 2505.24336

When Humans Growl and Birds Speak: High-Fidelity Voice Conversion from Human to Animal and Designed Sounds

Minsu Kang·Seolhee Lee·Choonghyeon Lee·Namhyun Cho
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Abstract

Human to non-human voice conversion (H2NH-VC) transforms human speech into animal or designed vocalizations. Unlike prior studies focused on dog-sounds and 16 or 22.05kHz audio transformation, this work addresses a broader range of non-speech sounds, including natural sounds (lion-roars, birdsongs) and designed voice (synthetic growls). To accomodate generation of diverse non-speech sounds and 44.1kHz high-quality audio transformation, we introduce a preprocessing pipeline and an improved CVAE-based H2NH-VC model, both optimized for human and non-human voices. Experimental results showed that the proposed method outperformed baselines in quality, naturalness, and similarity MOS, achieving effective voice conversion across diverse non-human timbres. Demo samples are available at https://nc-ai.github.io/speech/publications/nonhuman-vc/

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Minsu Kang, Seolhee Lee, Choonghyeon Lee, Namhyun Cho. 2025-05-30. When Humans Growl and Birds Speak: High-Fidelity Voice Conversion from Human to Animal and Designed Sounds. https://arxiv.org/abs/2505.24336

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