DiffWave is a non-autoregressive diffusion model that generates high-fidelity audio waveforms from noise in constant steps, matching WaveNet vocoder quality while being orders of magnitude faster and outperforming prior models in unconditional generation.
MelNet: A Generative Model for Audio in the Frequency Domain
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abstract
Capturing high-level structure in audio waveforms is challenging because a single second of audio spans tens of thousands of timesteps. While long-range dependencies are difficult to model directly in the time domain, we show that they can be more tractably modelled in two-dimensional time-frequency representations such as spectrograms. By leveraging this representational advantage, in conjunction with a highly expressive probabilistic model and a multiscale generation procedure, we design a model capable of generating high-fidelity audio samples which capture structure at timescales that time-domain models have yet to achieve. We apply our model to a variety of audio generation tasks, including unconditional speech generation, music generation, and text-to-speech synthesis---showing improvements over previous approaches in both density estimates and human judgments.
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MARS adapts next-scale autoregressive modeling to spectrograms for sound generation via multi-channel image treatment, channel multiplexing, and a shared tokenizer.
Jukebox generates high-fidelity and diverse songs with singing and coherence up to multiple minutes by compressing raw audio via multi-scale VQ-VAE and modeling the codes with large autoregressive Transformers conditioned on artist, genre, and unaligned lyrics.
FOT-CFM generates turbulent fields in function space with superior high-order statistics and energy spectra on Navier-Stokes, Kolmogorov flow, and Hasegawa-Wakatani equations compared to baselines.
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MARS: Sound Generation via Multi-Channel Autoregression on Spectrograms
MARS adapts next-scale autoregressive modeling to spectrograms for sound generation via multi-channel image treatment, channel multiplexing, and a shared tokenizer.