  In this paper, we propose a singing voice synthesis model, Karaoker-SSL, that
is trained only on text and speech data as a typical multi-speaker acoustic
model. It is a low-resource pipeline that does not utilize any singing data
end-to-end, since its vocoder is also trained on speech data. Karaoker-SSL is
conditioned by self-supervised speech representations in an unsupervised
manner. We preprocess these representations by selecting only a subset of their
task-correlated dimensions. The conditioning module is indirectly guided to
capture style information during training by multi-tasking. This is achieved
with a Conformer-based module, which predicts the pitch from the acoustic
model's output. Thus, Karaoker-SSL allows singing voice synthesis without
reliance on hand-crafted and domain-specific features. There are also no
requirements for text alignments or lyrics timestamps. To refine the voice
quality, we employ a U-Net discriminator that is conditioned on the target
speaker and follows a Diffusion GAN training scheme.
