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This paper describes ESPnet2-TTS, an end-to-end text-to-speech (E2E-TTS) toolkit. ESPnet2-TTS extends our earlier version, ESPnet-TTS, by adding many new features, including: on-the-fly flexible pre-processing, joint training with neural…

Attention based neural TTS is elegant speech synthesis pipeline and has shown a powerful ability to generate natural speech. However, it is still not robust enough to meet the stability requirements for industrial products. Besides, it…

Audio and Speech Processing · Electrical Eng. & Systems 2020-11-03 Qiao Tian , Zewang Zhang , Chao Liu , Heng Lu , Linghui Chen , Bin Wei , Pujiang He , Shan Liu

This paper introduces Embarrassingly Easy Text-to-Speech (E2 TTS), a fully non-autoregressive zero-shot text-to-speech system that offers human-level naturalness and state-of-the-art speaker similarity and intelligibility. In the E2 TTS…

Audio and Speech Processing · Electrical Eng. & Systems 2024-09-13 Sefik Emre Eskimez , Xiaofei Wang , Manthan Thakker , Canrun Li , Chung-Hsien Tsai , Zhen Xiao , Hemin Yang , Zirun Zhu , Min Tang , Xu Tan , Yanqing Liu , Sheng Zhao , Naoyuki Kanda

Current end-to-end autoregressive TTS systems (e.g. Tacotron 2) have outperformed traditional parallel approaches on the quality of synthesized speech. However, they introduce new problems at the same time. Due to the autoregressive nature,…

Audio and Speech Processing · Electrical Eng. & Systems 2020-08-07 Yahuan Cong , Ran Zhang , Jian Luan

Diffusion-based generative models have achieved state-of-the-art performance for perceptual quality in speech enhancement (SE). However, their iterative nature requires numerous Neural Function Evaluations (NFEs), posing a challenge for…

We propose Shallow Flow Matching (SFM), a novel mechanism that enhances flow matching (FM)-based text-to-speech (TTS) models within a coarse-to-fine generation paradigm. Unlike conventional FM modules, which use the coarse representations…

Audio and Speech Processing · Electrical Eng. & Systems 2025-10-24 Dong Yang , Yiyi Cai , Yuki Saito , Lixu Wang , Hiroshi Saruwatari

The rapid development of large-scale text-to-speech (TTS) models has led to significant advancements in modeling diverse speaker prosody and voices. However, these models often face issues such as slow inference speeds, reliance on complex…

Audio and Speech Processing · Electrical Eng. & Systems 2024-09-17 Yinghao Aaron Li , Xilin Jiang , Cong Han , Nima Mesgarani

We present PFluxTTS, a hybrid text-to-speech system addressing three gaps in flow-matching TTS: the stability-naturalness trade-off, weak cross-lingual voice cloning, and limited audio quality from low-rate mel features. Our contributions…

We propose an end-to-end speech synthesizer, Fast DCTTS, that synthesizes speech in real time on a single CPU thread. The proposed model is composed of a carefully-tuned lightweight network designed by applying multiple network reduction…

Audio and Speech Processing · Electrical Eng. & Systems 2021-04-02 Minsu Kang , Jihyun Lee , Simin Kim , Injung Kim

We propose Easy End-to-End Diffusion-based Text to Speech, a simple and efficient end-to-end text-to-speech model based on diffusion. E3 TTS directly takes plain text as input and generates an audio waveform through an iterative refinement…

Sound · Computer Science 2023-11-03 Yuan Gao , Nobuyuki Morioka , Yu Zhang , Nanxin Chen

We propose a novel two-stage text-to-speech (TTS) framework with two types of discrete tokens, i.e., semantic and acoustic tokens, for high-fidelity speech synthesis. It features two core components: the Interpreting module, which processes…

Audio and Speech Processing · Electrical Eng. & Systems 2024-06-26 Joun Yeop Lee , Myeonghun Jeong , Minchan Kim , Ji-Hyun Lee , Hoon-Young Cho , Nam Soo Kim

Expressive text-to-speech (TTS) aims to synthesize speeches with human-like tones, moods, or even artistic attributes. Recent advancements in expressive TTS empower users with the ability to directly control synthesis style through natural…

Audio and Speech Processing · Electrical Eng. & Systems 2023-11-03 Hanglei Zhang , Yiwei Guo , Sen Liu , Xie Chen , Kai Yu

The recent text-to-speech (TTS) has achieved quality comparable to that of humans; however, its application in spoken dialogue has not been widely studied. This study aims to realize a TTS that closely resembles human dialogue. First, we…

Audio and Speech Processing · Electrical Eng. & Systems 2022-06-27 Kentaro Mitsui , Tianyu Zhao , Kei Sawada , Yukiya Hono , Yoshihiko Nankaku , Keiichi Tokuda

Controlling speaking style in text-to-speech (TTS) systems has become a growing focus in both academia and industry. While many existing approaches rely on reference audio to guide style generation, such methods are often impractical due to…

Sound · Computer Science 2025-10-22 Haowei Lou , Hye-Young Paik , Wen Hu , Lina Yao

Unconstrained lip-to-speech synthesis aims to generate corresponding speeches from silent videos of talking faces with no restriction on head poses or vocabulary. Current works mainly use sequence-to-sequence models to solve this problem,…

Sound · Computer Science 2022-07-14 Yongqi Wang , Zhou Zhao

We present FlowLM, a flow matching language model transformed from pre-trained diffusion language models via efficient fine-tuning. By re-aligning the curved sampling trajectories of diffusion models into straight-line flows, FlowLM enables…

Computation and Language · Computer Science 2026-05-21 Runzhe Zhang , Letian Chen , Wenpeng Zhang , Zhouhan Lin , Peilin Zhao

Recently, zero-shot text-to-speech (TTS) systems, capable of synthesizing any speaker's voice from a short audio prompt, have made rapid advancements. However, the quality of the generated speech significantly deteriorates when the audio…

Audio and Speech Processing · Electrical Eng. & Systems 2024-06-11 Xiaofei Wang , Sefik Emre Eskimez , Manthan Thakker , Hemin Yang , Zirun Zhu , Min Tang , Yufei Xia , Jinzhu Li , Sheng Zhao , Jinyu Li , Naoyuki Kanda

Text to speech (TTS) has been broadly used to synthesize natural and intelligible speech in different scenarios. Deploying TTS in various end devices such as mobile phones or embedded devices requires extremely small memory usage and…

Sound · Computer Science 2021-02-09 Renqian Luo , Xu Tan , Rui Wang , Tao Qin , Jinzhu Li , Sheng Zhao , Enhong Chen , Tie-Yan Liu

While modern TTS technologies have made significant advancements in audio quality, there is still a lack of behavior naturalness compared to conversing with people. We propose a style-embedded TTS system that generates styled responses…

Sound · Computer Science 2020-09-23 Yang Gao , Weiyi Zheng , Zhaojun Yang , Thilo Kohler , Christian Fuegen , Qing He

Existing autoregressive large-scale text-to-speech (TTS) models have advantages in speech naturalness, but their token-by-token generation mechanism makes it difficult to precisely control the duration of synthesized speech. This becomes a…

Computation and Language · Computer Science 2025-09-04 Siyi Zhou , Yiquan Zhou , Yi He , Xun Zhou , Jinchao Wang , Wei Deng , Jingchen Shu