Model Overview
MelGAN is a generative adversarial network (GAN) model that generates audio from mel spectrograms. This checkpoint implements the full-band MelGAN as described in the Multi-band MelGAN paper [1].
Model Architecture
The MelGAN generator uses transposed convolutions to upscale by the mel spectrogram to audio.
Training
This model is trained on LJSpeech sampled at 22050Hz, and has been tested on generating female English voices with an American accent. All NeMo models are trained in accordance with the model yaml. In particular, this model was trained on 8 16GB V100 gpus for 3000 epochs with a batch size of 64.
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 spectrogram generator
from nemo.collections.tts.models import FastPitchModel
spec_generator = FastPitchModel.from_pretrained("tts_en_fastpitch")
# Load Melgan
from nemo.collections.tts.models import MelGanModel
model = MelGanModel.from_pretrained(model_name="tts_melgan")
# Generate audio
import soundfile as sf
parsed = spec_generator.parse("You can type your sentence here to get nemo to produce speech.")
spectrogram = spec_generator.generate_spectrogram(tokens=parsed)
audio = model.convert_spectrogram_to_audio(spec=spectrogram)
# Save the audio to disk in a file called speech.wav
sf.write("speech.wav", audio.to('cpu').numpy(), 22050)
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
1.0.0 (current): An updated version of melgan that standardizes mel spectrogram generation across NeMo models.
1.0.0rc1: The original version that was released with NeMo 1.0.0.rc1
References
MelGAN paper: https://arxiv.org/abs/1910.06711
Multi-band MelGAN paper: https://arxiv.org/abs/2005.05106
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.