Model Overview

Model Architecture

UnivNet is a generative adversarial network (GAN) model that generates audio from mel spectrograms. The generator uses transposed convolutions to upsample mel-spectrograms to audio.

Training

Dataset

This model is trained on LJSpeech sampled at 22050Hz, and has been tested on generating female English voices with an American accent.

Performance

No performance information available at this time.

How to Use this Model

This model can be automatically loaded from NGC.

NOTE: In order to generate audio, you also need a spectrogram generator from NeMo. This example uses the FastPitch model.

# Load PastPitch\nfrom nemo.collections.tts.models import FastPitchModel\nspec_generator = FastPitchModel.from_pretrained(\"tts_en_fastpitch\")\n\n# Load UnivNet\nfrom nemo.collections.tts.models import UnivNetModel\nmodel = UnivNetModel.from_pretrained(model_name=\"tts_en_lj_univnet\")\n\n# Generate audio\nimport soundfile as sf\nparsed = spec_generator.parse(\"You can type your sentence here to get nemo to produce speech.\")\nspectrogram = spec_generator.generate_spectrogram(tokens=parsed)\naudio = model.convert_spectrogram_to_audio(spec=spectrogram)\n\n### Save the audio to disk in a file called speech.wav\nsf.write(\"speech.wav\", audio.to('cpu').numpy(), 22050)\n

Input

This model accepts batches of mel spectrograms.

Output

This model outputs audio at 22050Hz.

Limitations

There are no known limitations at this time.

Versions

1.7.0: Add model (tts_en_lj_univnet.nemo) which was released with NeMo 1.7.0.

References

UnivNet paper: https://arxiv.org/abs/2106.07889

Licence

License to use this model is covered by the NGC TERMS OF USE unless another License/Terms Of Use/EULA is clearly specified. By downloading the public and release version of the model, you accept the terms and conditions of the NGC TERMS OF USE.

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The generator uses transposed convolutions to upsample mel-spectrograms to audio.\n\n## Training\n### Dataset\nThis model is trained on LJSpeech sampled at 22050Hz, and has been tested on generating female English voices with an American accent. \n\n## Performance\nNo performance information available at this time.\n\n## How to Use this Model\n\nThis model can be automatically loaded from NGC.\n\nNOTE: In order to generate audio, you also need a spectrogram generator from NeMo. This example uses the FastPitch model.\n```python\n# Load PastPitch\nfrom nemo.collections.tts.models import FastPitchModel\nspec_generator = FastPitchModel.from_pretrained(\"tts_en_fastpitch\")\n\n# Load UnivNet\nfrom nemo.collections.tts.models import UnivNetModel\nmodel = UnivNetModel.from_pretrained(model_name=\"tts_en_lj_univnet\")\n\n# Generate audio\nimport soundfile as sf\nparsed = spec_generator.parse(\"You can type your sentence here to get nemo to produce speech.\")\nspectrogram = spec_generator.generate_spectrogram(tokens=parsed)\naudio = model.convert_spectrogram_to_audio(spec=spectrogram)\n\n### Save the audio to disk in a file called speech.wav\nsf.write(\"speech.wav\", audio.to('cpu').numpy(), 22050)\n```\n\n### Input\nThis model accepts batches of mel spectrograms.\n\n### Output\nThis model outputs audio at 22050Hz.\n\n## Limitations\nThere are no known limitations at this time.\n\n## Versions\n**1.7.0**: Add model (tts_en_lj_univnet.nemo) which was released with NeMo 1.7.0.\n\n## References\nUnivNet paper: https://arxiv.org/abs/2106.07889\n\n## Licence\nLicense to use this model is covered by the NGC [TERMS OF USE](https://ngc.nvidia.com/legal/terms) unless another License/Terms Of Use/EULA is clearly specified. 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