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Denoising diffusion probabilistic models (DDPMs) and generative adversarial networks (GANs) are popular generative models for neural vocoders. The DDPMs and GANs can be characterized by the iterative denoising framework and adversarial…

Audio and Speech Processing · Electrical Eng. & Systems 2022-10-04 Yuma Koizumi , Kohei Yatabe , Heiga Zen , Michiel Bacchiani

Existing dominant methods for audio generation include Generative Adversarial Networks (GANs) and diffusion-based methods like Flow Matching. GANs suffer from slow convergence during training, while diffusion methods require multi-step…

Audio and Speech Processing · Electrical Eng. & Systems 2026-03-10 Zengwei Yao , Wei Kang , Han Zhu , Liyong Guo , Lingxuan Ye , Fangjun Kuang , Weiji Zhuang , Zhaoqing Li , Zhifeng Han , Long Lin , Daniel Povey

Conditional waveform synthesis models learn a distribution of audio waveforms given conditioning such as text, mel-spectrograms, or MIDI. These systems employ deep generative models that model the waveform via either sequential…

Audio and Speech Processing · Electrical Eng. & Systems 2022-03-07 Max Morrison , Rithesh Kumar , Kundan Kumar , Prem Seetharaman , Aaron Courville , Yoshua Bengio

When trained on multimodal image datasets, normal Generative Adversarial Networks (GANs) are usually outperformed by class-conditional GANs and ensemble GANs, but conditional GANs is restricted to labeled datasets and ensemble GANs lack…

Computer Vision and Pattern Recognition · Computer Science 2019-01-29 Haifeng Shi , Guanyu Cai , Yuqin Wang , Shaohua Shang , Lianghua He

In speech synthesis, a generative adversarial network (GAN), training a generator (speech synthesizer) and a discriminator in a min-max game, is widely used to improve speech quality. An ensemble of discriminators is commonly used in recent…

Sound · Computer Science 2023-03-27 Takuhiro Kaneko , Hirokazu Kameoka , Kou Tanaka , Shogo Seki

This paper introduces WaveGrad, a conditional model for waveform generation which estimates gradients of the data density. The model is built on prior work on score matching and diffusion probabilistic models. It starts from a Gaussian…

Audio and Speech Processing · Electrical Eng. & Systems 2020-10-12 Nanxin Chen , Yu Zhang , Heiga Zen , Ron J. Weiss , Mohammad Norouzi , William Chan

Generative adversarial networks have seen rapid development in recent years and have led to remarkable improvements in generative modelling of images. However, their application in the audio domain has received limited attention, and…

Most modern text-to-speech architectures use a WaveNet vocoder for synthesizing high-fidelity waveform audio, but there have been limitations, such as high inference time, in its practical application due to its ancestral sampling scheme.…

Sound · Computer Science 2019-05-21 Sungwon Kim , Sang-gil Lee , Jongyoon Song , Jaehyeon Kim , Sungroh Yoon

We propose a learning-based filter that allows us to directly modify a synthetic speech waveform into a natural speech waveform. Speech-processing systems using a vocoder framework such as statistical parametric speech synthesis and voice…

Audio and Speech Processing · Electrical Eng. & Systems 2018-10-02 Kou Tanaka , Takuhiro Kaneko , Nobukatsu Hojo , Hirokazu Kameoka

This paper introduces WaveNet, a deep neural network for generating raw audio waveforms. The model is fully probabilistic and autoregressive, with the predictive distribution for each audio sample conditioned on all previous ones;…

Speech synthesis is an important practical generative modeling problem that has seen great progress over the last few years, with likelihood-based autoregressive neural models now outperforming traditional concatenative systems. A downside…

Audio and Speech Processing · Electrical Eng. & Systems 2020-10-26 Alexey A. Gritsenko , Tim Salimans , Rianne van den Berg , Jasper Snoek , Nal Kalchbrenner

Remarkable achievements have been attained with Generative Adversarial Networks (GANs) in image-to-image translation. However, due to a tremendous amount of parameters, state-of-the-art GANs usually suffer from low efficiency and bulky…

Computer Vision and Pattern Recognition · Computer Science 2022-03-15 Linfeng Zhang , Xin Chen , Xiaobing Tu , Pengfei Wan , Ning Xu , Kaisheng Ma

State-of-the-art models for high-resolution image generation, such as BigGAN and VQVAE-2, require an incredible amount of compute resources and/or time (512 TPU-v3 cores) to train, putting them out of reach for the larger research…

Image and Video Processing · Electrical Eng. & Systems 2020-10-27 Seungwook Han , Akash Srivastava , Cole Hurwitz , Prasanna Sattigeri , David D. Cox

Recent developments in generative models have shown that deep learning combined with traditional digital signal processing (DSP) techniques could successfully generate convincing violin samples [1], that source-excitation combined with…

Audio and Speech Processing · Electrical Eng. & Systems 2020-08-07 Ollie McCarthy , Zohaib Ahmed

Most neural vocoders are limited to one type: either GAN or diffusion-based. While state-of-the-art models like Vocos and WaveNeXt use powerful ConvNeXt-based generators, they have only been used in GAN frameworks and have limited…

Audio and Speech Processing · Electrical Eng. & Systems 2026-05-26 Wangzixi Zhou , Takuma Okamoto , Yamato Ohtani , Sakriani Sakti , Hisashi Kawai

We introduce EffiFusion-GAN (Efficient Fusion Generative Adversarial Network), a lightweight yet powerful model for speech enhancement. The model integrates depthwise separable convolutions within a multi-scale block to capture diverse…

Sound · Computer Science 2025-08-21 Bin Wen , Tien-Ping Tan

Since the introduction of Generative Adversarial Networks (GANs) in speech synthesis, remarkable achievements have been attained. In a thorough exploration of vocoders, it has been discovered that audio waveforms can be generated at speeds…

Audio and Speech Processing · Electrical Eng. & Systems 2024-08-14 Yubing Cao , Yongming Li , Liejun Wang , Yinfeng Yu

The generative adversarial networks (GANs) have facilitated the development of speech enhancement recently. Nevertheless, the performance advantage is still limited when compared with state-of-the-art models. In this paper, we propose a…

Sound · Computer Science 2020-06-16 Andong Li , Chengshi Zheng , Renhua Peng , Cunhang Fan , Xiaodong Li

Voice conversion is to generate a new speech with the source content and a target voice style. In this paper, we focus on one general setting, i.e., non-parallel many-to-many voice conversion, which is close to the real-world scenario. As…

Sound · Computer Science 2022-07-28 Jian Ma , Zhedong Zheng , Hao Fei , Feng Zheng , Tat-seng Chua , Yi Yang

We introduce a novel method for emotion conversion in speech that does not require parallel training data. Our approach loosely relies on a cycle-GAN schema to minimize the reconstruction error from converting back and forth between emotion…

Audio and Speech Processing · Electrical Eng. & Systems 2020-08-12 Ravi Shankar , Jacob Sager , Archana Venkataraman