PeriodWave: Multi-Period Flow Matching for High-Fidelity Waveform Generation
_{The official implementation of PeriodWave and PeriodWave-Turbo}

| ||Demo page|Demo Page (Turbo)

Sang-Hoon Lee^1,2, Ha-Yeong Choi³, Seong-Whan Lee⁴

¹ Department of Software and Computer Engineering, Ajou University, Suwon, Korea
² Department of Artificial Intelligence, Ajou University, Suwon, Korea
³ AI Tech Lab, KT Corp., Seoul, Korea
⁴ Department of Artificial Intelligence, Korea University, Seoul, Korea

This repository contains:

• 🪐 A PyTorch implementation of PeriodWave and PeriodWave-Turbo
• ⚡️ Pre-trained PeriodWave models trained on LibriTTS (24,000 Hz, 100 bins, hop size of 256)
• 💥 Pre-trained PeriodWave models trained on LJSpeech (22,050 Hz, 80 bins, hop size of 256)
• 🛸 A PeriodWave training script

Update

24.08.16

In this repositoy, we provide a new paradigm and architecture of Neural Vocoder that enables notably fast training and achieves SOTA performance. With 10 times fewer training times, we acheived State-of-The-Art Performance on LJSpeech and LibriTTS.

First, Train the PeriodWave with conditional flow matching.

• PeriodWave: The first successful conditional flow matching waveform generator that outperforms GAN-based Neural Vocoders

Second, Accelerate the PeriodWave with adversarial flow matching optimzation.

• PeriodWave-Turbo: SOTA Few-step Generator tuned from PeriodWave

Todo

PeriodWave

• PeriodWave (Trained with LJSpeech, 22.05 kHz, 80 bins)
• PeriodWave (Trained with LibriTTS-train-960, 24 kHz, 100 bins)
• Training Code
• Inference
• PeriodWave with FreeU (Only Inference)
• Evaluation (M-STFT, PESQ, Periodicity, V/UV F1, Pitch, UTMOS)
• PeriodWave-Small (Trained with LibriTTS-train-960, 24 kHz, 100 bins)
• PeriodWave-Large (Trained with LibriTTS-train-960, 24 kHz, 100 bins)

PeriodWave-Turbo

• Paper (PeriodWave-Turbo paper was released, https://arxiv.org/abs/2408.08019.)
• PeriodWave-Turbo (4 Steps ODE, Euler Method)
• PeriodWave-Turbo-Small (4 Steps ODE, Euler Method)
• PeriodWave-Turbo-Large (4 Steps ODE, Euler Method)

We have compared several methods including different reconstuction losses, distillation methods, and GANs for PeriodWave-Turbo. Finetuning the PeriodWave models with fixed steps could significantly improve the performance! The PeriodWave-Turbo utilized the Multi-scale Mel-spectrogram loss and Adversarial Training (MPD, CQT-D) following BigVGAN-v2. We highly appreciate the authors of BigVGAN for their dedication to the open-source implementation. Thanks to their efforts, we were able to quickly experiment and reduce trial and error.

TTS with PeriodWave

• PeriodWave with TTS (24 kHz, 100 bins)

The era of Mel-spectrograms is returning with advancements in models like P-Flow, VoiceBox, E2-TTS, DiTTo-TTS, ARDiT-TTS, and MELLE. PeriodWave can enhance the audio quality of your TTS models, eliminating the need to rely on codec models. Mel-spectrogram with powerful generative models has the potential to surpass neural codec language models in performance.

Getting Started

Pre-requisites

0. Pytorch >=1.13 and torchaudio >= 0.13
1. Install requirements

pip install -r requirements.txt

Prepare Dataset

2. Prepare your own Dataset (We utilized LibriTTS dataset without any preprocessing)
3. Extract Energy Min/Max

python extract_energy.py

4. Change energy_max, energy_min in Config.json

Train PeriodWave

CUDA_VISIBLE_DEVICES=0,1,2,3 python train_periodwave.py -c configs/periodwave.json -m periodwave

Train PeriodWave-Turbo

• Finetuning the PeriodWave with fixed steps can improve the entire performance and accelerate the inference speed (NFE 32 --> 2 or 4)

CUDA_VISIBLE_DEVICES=0,1,2,3 python train_periodwave_turbo.py -c configs/periodwave_turbo.json -m periodwave_turbo

Inference PeriodWave (24 kHz)

# PeriodWave
CUDA_VISIBLE_DEVICES=0 python inference.py --ckpt "logs/periodwave_base_libritts/G_1000000.pth" --iter 16 --noise_scale 0.667 --solver 'midpoint'

# PeriodWave with FreeU (--s_w 0.9 --b_w 1.1)
# Decreasing skip features could reduce the high-frequency noise of generated samples
# We only recommend using FreeU with PeriodWave. Note that PeriodWave-Turbe with FreeU has different aspects so we do not use FreeU with PeriodWave-Turbo. 
CUDA_VISIBLE_DEVICES=0 python inference_with_FreeU.py --ckpt "logs/periodwave_libritts/G_1000000.pth" --iter 16 --noise_scale 0.667 --solver 'midpoint' --s_w 0.9 --b_w 1.1

# PeriodWave-Turbo-4steps (Highly Recommended)
CUDA_VISIBLE_DEVICES=0 python inference.py --ckpt "logs/periodwave_turbo_base_step4_libritts_24000hz/G_274000.pth" --iter 4 --noise_scale 1 --solver 'euler'

Reference

Flow Matching for high-quality and efficient generative model

• FM: https://openreview.net/forum?id=PqvMRDCJT9t
• VoiceBox (Mel-spectrogram Generation): https://openreview.net/forum?id=gzCS252hCO&noteId=e2GZZfeO9g
• P-Flow (Mel-spectrogram Generation): https://openreview.net/forum?id=zNA7u7wtIN
• RF-Wave (Waveform Generation): https://github.com/bfs18/rfwave (After paper submission, we found that the paper RF-Wave also utilized FM for waveform generation. They used it on the complex spectrogram domain for efficient waveform generation. It is cool idea!)

Inspired by the multi-period discriminator of HiFi-GAN, we first distillate the multi-periodic property in generator

• HiFi-GAN: https://github.com/jik876/hifi-gan

Prior Distribution

• PriorGrad: https://github.com/microsoft/NeuralSpeech/tree/master/PriorGrad-vocoder

Frequency-wise waveform modeling due to the limitation of high-frequency modeling

• Fre-GAN 2: https://github.com/prml-lab-speech-team/demo/tree/master/FreGAN2/code
• MBD (Multi-band Diffusion): https://github.com/facebookresearch/audiocraft
• FreGrad: https://github.com/kaistmm/fregrad

High-efficient temporal modeling

• Vocos: https://github.com/gemelo-ai/vocos
• ConvNeXt-V2: https://github.com/facebookresearch/ConvNeXt-V2

Large-scale Universal Vocoder

• BigVGAN: https://arxiv.org/abs/2206.04658
• BigVSAN: https://github.com/sony/bigvsan