DiTVC: One-Shot Voice Conversion via Diffusion Transformer with Environment and Speaking Rate Cloning

Traditional zero-shot voice conversion methods typically extract a speaker embedding from a reference recording first and then generate the source speech content in the target speaker's voice by conditioning on that embedding. However, this process often overlooks time-dependent speaker characteristics, such as voice dynamics and speaking rates, as well as environmental acoustic properties of the reference recording. To address these limitations, we propose a one-shot voice conversion framework capable of replicating not only voice timbre but also acoustic properties. Our model is built upon Diffusion Transformers (DiT) and conditioned on a designed content representation for acoustic cloning. Besides, we introduce specific augmentations during training to enable accurate speaking rate cloning. Both objective and subjective evaluations demonstrate that our method outperforms existing approaches in terms of audio quality, speaker similarity, and environmental acoustic similarity, while effectively capturing the speaking rate distribution of target speakers. Audio samples are available at: ditvc.github.io.