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sheng zhao

30 accepted papers

2026

FlexiCodec: A Dynamic Neural Audio Codec for Low Frame Rates

ICLR 2026poster

Neural audio codecs are foundational to speech language models. It is expected to have a low frame rate and decoupled semantic and acoustic information. A lower frame rate codec can reduce the computational cost of speech language models by shortening the sequence length. Recent studies have develop…

Cited by 0SourcecodeScholar
2025

Autoregressive Speech Synthesis without Vector Quantization

ACL 2025long

We present MELLE, a novel continuous-valued token based language modeling approach for text-to-speech synthesis (TTS). MELLE autoregressively generates continuous mel-spectrogram frames directly from text condition, bypassing the need for vector quantization, which is typically designed for audio co…

2025

CoVoMix2: Advancing Zero-Shot Dialogue Generation with Fully Non-Autoregressive Flow Matching

NeurIPS 2025poster

Generating natural-sounding, multi-speaker dialogue is crucial for applications such as podcast creation, virtual agents, and multimedia content generation. However, existing systems struggle to maintain speaker consistency, model overlapping speech, and synthesize coherent conversations efficiently…

Cited by 0SourceScholar
2025

LIMMITS'25: Multilingual Streaming TTS With Neural Codecs for Indian Languages

ICASSP 2025accepted

This work provides a summary of the Multilingual streaming TTS with neural codecs for Indian languages challenge (LIMMITS’25), organized as part of the ICASSP 2025 signal processing grand challenge. Towards this, 278 hours of TTS data in 4 Indian languages - Gujarati, Indian English, Bhojpuri, and K…

Cited by 0SourceScholar
2025

ZSVC: Zero-shot Style Voice Conversion with Disentangled Latent Diffusion Models and Adversarial Training

ICASSP 2025accepted

Style voice conversion aims to transform the speaking style of source speech into a desired style while keeping the original speaker’s identity. However, previous style voice conversion approaches primarily focus on well-defined domains such as emotional aspects, limiting their practical application…

Cited by 0SourceScholar
2024

CoVoMix: Advancing Zero-Shot Speech Generation for Human-like Multi-talker Conversations

NeurIPS 2024poster

Recent advancements in zero-shot text-to-speech (TTS) modeling have led to significant strides in generating high-fidelity and diverse speech. However, dialogue generation, along with achieving human-like naturalness in speech, continues to be a challenge. In this paper, we introduce CoVoMix: Conver…

2024

GAIA: Zero-shot Talking Avatar Generation

ICLR 2024poster

Zero-shot talking avatar generation aims at synthesizing natural talking videos from speech and a single portrait image. Previous methods have relied on domain-specific heuristics such as warping-based motion representation and 3D Morphable Models, which limit the naturalness and diversity of the ge…

Cited by 21SourcePDFScholar
2024

NaturalSpeech 2: Latent Diffusion Models are Natural and Zero-Shot Speech and Singing Synthesizers

ICLR 2024spotlight

Scaling text-to-speech (TTS) to large-scale, multi-speaker, and in-the-wild datasets is important to capture the diversity in human speech such as speaker identities, prosodies, and styles (e.g., singing). Current large TTS systems usually quantize speech into discrete tokens and use language models…

2024

NaturalSpeech 3: Zero-Shot Speech Synthesis with Factorized Codec and Diffusion Models

ICML 2024oral

While recent large-scale text-to-speech (TTS) models have achieved significant progress, they still fall shorts in speech quality, similarity, and prosody. Considering that speech intricately encompasses various attributes (e.g., content, prosody, timbre, and acoustic details) that pose significant…

Cited by 172SourcePDFScholar
2024

PromptTTS 2: Describing and Generating Voices with Text Prompt

ICLR 2024poster

Speech conveys more information than text, as the same word can be uttered in various voices to convey diverse information. Compared to traditional text-to-speech (TTS) methods relying on speech prompts (reference speech) for voice variability, using text prompts (descriptions) is more user-friendly…

2024

UniAudio: Towards Universal Audio Generation with Large Language Models

ICML 2024poster

Audio generation is a major branch of generative AI research. Compared with prior works in this area that are commonly task-specific with heavy domain knowledge, this paper advocates building universal audio generation models that can handle various tasks in a unified manner. As recent research on l…

Cited by 16SourcePDFScholar
2023

AUDIT: Audio Editing by Following Instructions with Latent Diffusion Models

NeurIPS 2023poster

Audio editing is applicable for various purposes, such as adding background sound effects, replacing a musical instrument, and repairing damaged audio. Recently, some diffusion-based methods achieved zero-shot audio editing by using a diffusion and denoising process conditioned on the text descripti…

2023

HiFace: High-Fidelity 3D Face Reconstruction by Learning Static and Dynamic Details

ICCV 2023poster

3D Morphable Models (3DMMs) demonstrate great potential for reconstructing faithful and animatable 3D facial surfaces from a single image. The facial surface is influenced by the coarse shape, as well as the static detail (e,g., person-specific appearance) and dynamic detail (e.g., expression-driven…

Cited by 25PDFScholar
2023

Improving Contextual Spelling Correction by External Acoustics Attention and Semantic Aware Data Augmentation

ICASSP 2023accepted

We previously proposed contextual spelling correction (CSC) to correct the output of end-to-end (E2E) automatic speech recognition (ASR) models with contextual information such as name, place, etc. Although CSC has achieved reasonable improvement in the biasing problem, there are still two drawbacks…

Cited by 0SourceScholar
2023

LeanSpeech: The Microsoft Lightweight Speech Synthesis System for Limmits Challenge 2023

ICASSP 2023accepted

This paper describes the Microsoft Text-to-Speech (TTS) system: LeanSpeech for LIMMITS (Lightweight, Multi-speaker, Multi-lingual Indic TTS) Challenge 2023<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup>, which is part of ICASSP2023 to encourage…

Cited by 0SourceScholar
2023

Prompttts: Controllable Text-To-Speech With Text Descriptions

ICASSP 2023accepted

Using a text description as prompt to guide the generation of text or images (e.g., GPT-3 or DALLE-2) has drawn wide attention recently. Beyond text and image generation, in this work, we explore the possibility of utilizing text descriptions to guide speech synthesis. Thus, we develop a text-to-spe…

Cited by 0SourceScholar
2023

VideoDubber: Machine Translation with Speech-Aware Length Control for Video Dubbing

AAAI 2023technical

Video dubbing aims to translate the original speech in a film or television program into the speech in a target language, which can be achieved with a cascaded system consisting of speech recognition, machine translation and speech synthesis. To ensure the translated speech to be well aligned with t…

2022

A Study on the Efficacy of Model Pre-Training In Developing Neural Text-to-Speech System

ICASSP 2022accepted

In the development of neural text-to-speech systems, model pre-training with a large amount of non-target speakers’ data is a common approach. However, in terms of ultimately achieved system performance for target speaker(s), the actual benefits of model pre-training are uncertain and unstable, depe…

Cited by 0SourceScholar
2022

BinauralGrad: A Two-Stage Conditional Diffusion Probabilistic Model for Binaural Audio Synthesis

NeurIPS 2022accept

Binaural audio plays a significant role in constructing immersive augmented and virtual realities. As it is expensive to record binaural audio from the real world, synthesizing them from mono audio has attracted increasing attention. This synthesis process involves not only the basic physical warpin…

2022

Infergrad: Improving Diffusion Models for Vocoder by Considering Inference in Training

ICASSP 2022accepted

Denoising diffusion probabilistic models (diffusion models for short) require a large number of iterations in inference to achieve the generation quality that matches or surpasses the state-of-the-art generative models, which invariably results in slow inference speed. Previous approaches aim to opt…

Cited by 0SourceScholar
2022

Transformer-S2A: Robust and Efficient Speech-to-Animation

ICASSP 2022accepted

We propose a novel robust and efficient Speech-to-Animation (S2A) approach for synchronized facial animation generation in human-computer interaction. Compared with conventional approaches, the proposed approach utilizes phonetic posteriorgrams (PPGs) of spoken phonemes as input to ensure the cross-…

Cited by 0SourceScholar
2021

AdaSpeech: Adaptive Text to Speech for Custom Voice

ICLR 2021poster

Custom voice, a specific text to speech (TTS) service in commercial speech platforms, aims to adapt a source TTS model to synthesize personal voice for a target speaker using few speech from her/him. Custom voice presents two unique challenges for TTS adaptation: 1) to support diverse customers, the…

2021

Adaspeech 2: Adaptive Text to Speech with Untranscribed Data

ICASSP 2021accepted

Text to speech (TTS) is widely used to synthesize personal voice for a target speaker, where a well-trained source TTS model is fine-tuned with few paired adaptation data (speech and its transcripts) on this target speaker. However, in many scenarios, only untranscribed speech data is available for…

Cited by 0SourceScholar
2021

Denoispeech: Denoising Text to Speech with Frame-Level Noise Modeling

ICASSP 2021accepted

While neural-based text to speech (TTS) models can synthesize natural and intelligible voice, they usually require high-quality speech data, which is costly to collect. In many scenarios, only noisy speech of a target speaker is available, which presents challenges for TTS model training for this sp…

Cited by 0SourceScholar
2021

FastSpeech 2: Fast and High-Quality End-to-End Text to Speech

ICLR 2021poster

Non-autoregressive text to speech (TTS) models such as FastSpeech can synthesize speech significantly faster than previous autoregressive models with comparable quality. The training of FastSpeech model relies on an autoregressive teacher model for duration prediction (to provide more information as…

2021

Lightspeech: Lightweight and Fast Text to Speech with Neural Architecture Search

ICASSP 2021accepted

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 inference latency. While non-autoregressive TTS models such as Fas…

Cited by 0SourceScholar
2021

MBNET: MOS Prediction for Synthesized Speech with Mean-Bias Network

ICASSP 2021accepted

Mean opinion score (MOS) is a popular subjective metric to assess the quality of synthesized speech, and usually involves multiple human judges to evaluate each speech utterance. To reduce the labor cost in MOS test, multiple methods have been proposed to automatically predict MOS scores. To our kno…

Cited by 0SourceScholar
2019

Almost Unsupervised Text to Speech and Automatic Speech Recognition

ICML 2019oral

Text to speech (TTS) and automatic speech recognition (ASR) are two dual tasks in speech processing and both achieve impressive performance thanks to the recent advance in deep learning and large amount of aligned speech and text data. However, the lack of aligned data poses a major practical proble…

Cited by 131SourcePDFScholar
2019

Dilated Residual Network with Multi-head Self-attention for Speech Emotion Recognition

ICASSP 2019accepted

Speech emotion recognition (SER) plays an important role in intelligent speech interaction. One vital challenge in SER is to extract emotion-relevant features from speech signals. In state-of-the-art SER techniques, deep learning methods, e.g, Convolutional Neural Networks (CNNs), are widely employe…

Cited by 0SourceScholar
2019

FastSpeech: Fast, Robust and Controllable Text to Speech

NeurIPS 2019poster

Neural network based end-to-end text to speech (TTS) has significantly improved the quality of synthesized speech. Prominent methods (e.g., Tacotron 2) usually first generate mel-spectrogram from text, and then synthesize speech from the mel-spectrogram using vocoder such as WaveNet. Compared with t…