Voice Conversion for Low-Resource Languages via Knowledge Transfer and Domain-Adversarial Training

Voice conversion (VC) aims to transform speech from a source speaker to a target speaker while preserving the original linguistic content. However, existing VC models typically require large annotated datasets containing transcripts and speaker labels, posing significant challenges for low-resource languages. In any-to-any voice conversion (VC) models that do not rely on annotated datasets, disentangling speaker information from the source speech while preserving linguistic content remains a significant challenge, often resulting in outputs that retain attributes of the source speaker. This paper introduces a novel low-resource VC model that combines knowledge transfer with domain-adversarial training to leverage information from high-resource languages for the benefit of low-resource languages. The proposed approach utilizes pretrained models, with domain-adversarial training enabling the separation of content from speaker identity without the need for annotated datasets. Objective and subjective evaluations on the low-resource Vietnamese language demonstrate that the proposed model outperforms existing methods in terms of naturalness and speaker similarity in low-resource scenarios. Audio samples are available at: https://huutuongtu.github.io/KTVC/index.html.