RFWave: Multi-band Rectified Flow for Audio Waveform Reconstruction.

Audio samples | Paper

TL;DR

RFWave utilizes multi-band Rectified Flow for high-fidelity audio waveform reconstruction from either Mel-spectrograms or discrete tokens, and boasts a generation speed 97 times faster than real-time on a GPU.

Abstract

Recent advancements in generative modeling have significantly enhanced the reconstruction of audio waveforms from various representations. While diffusion models are adept at this task, they are hindered by latency issues due to their operation at the individual sample point level and the need for numerous sampling steps. In this study, we introduce RFWave, a cutting-edge multi-band Rectified Flow approach designed to reconstruct high-fidelity audio waveforms from Mel-spectrograms or discrete tokens. RFWave uniquely generates complex spectrograms and operates at the frame level, processing all subbands simultaneously to boost efficiency. Leveraging Rectified Flow, which targets a flat transport trajectory, RFWave achieves reconstruction with just 10 sampling steps. Our empirical evaluations show that RFWave not only provides outstanding reconstruction quality but also offers vastly superior computational efficiency, enabling audio generation at speeds up to 97 times faster than real-time on a GPU. An online demonstration is available at: https://rfwave-demo.github.io/rfwave/.

Usage

Setup

1. Install the requirements.

sudo apt-get update
sudo apt-get install sox libsox-fmt-all libsox-dev
conda create -n rfwave python=3.10
conda activate rfwave
pip install -r requirements.txt

2. Download and extract the LJ Speech dataset
3. Update the wav paths in filelists sed -i -- 's,LJSPEECH_PATH,ljs_dataset_folder,g' LJSpeech/*.filelist
4. Update the filelist_path in configs/*.yaml.

Vocoder

1. Train a vocoder python3 train.py -c configs/rfwave.yaml
2. Test a trained vocoder with inference_voc.py

Encodec Decoder

1. Train an Encodec Decoder python3 train.py -c configs/rfwave-encodec.yaml

Text to Speech

1. Download the alignment from the SyntaSpeech repo
2. Convert the alignments and build a phoneset with scripts/ljspeech_synta.py
3. Modify the filelist_path and phoneset path in configs/rfwave-dur.yaml and configs/rfwave-tts-ctx.yaml
4. Train a duration model python3 train.py -c configs/rfwave-dur.yaml
5. Train an acoustic model python3 train.py -c configs/rfwave-tts-ctx.yaml
6. Test the trained model with inference_tts.py

Pre-trained models

python3 inference_voc.py --model_dir MODEL_DIR --wav_dir WAV_DIR --save_dir SAVE_DIR

rfwave-libritts-24k

rfwave-jamendo-44.1k

rfwave-encodec-24k

Test set

The test set for reconstructing waveform form EnCodec tokens.

audio_reconstruct_universal_testset

Thanks

This repository uses code from Vocos, audiocraft