DVQVC: AN UNSUPERVISED ZERO-SHOT VOICE CONVERSION FRAMEWORK

Zero-shot voice conversion (VC) is to convert speech from one speaker to a target speaker while preserving the original linguistic information, given only one reference speech clip of the unseen target speaker. This work proposes a new VC model, and its key idea is to conduct thorough speaker and content disentanglement by adopting an advanced speech encoder plus vector quantization (VQ) as a content encoder, and an advanced speaker encoder for accurate speaker embedding. In addition, we propose a perceptual loss, a speaker constrative loss and an adversarial loss to compensate the content imperfection caused by VQ and to further improve the speech quality/intelligibility. Overall, the proposed model uses only unsupervised features/losses, and achieves excellent VC performance in terms of both speech quality/intelligibility and speaker similarity, for both seen and unseen speakers.