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Large language models have revolutionized natural language processing through self-supervised pretraining on massive datasets. Inspired by this success, researchers have explored adapting these methods to speech by discretizing continuous…

Machine Learning · Computer Science 2025-10-28 Luca Della Libera , Francesco Paissan , Cem Subakan , Mirco Ravanelli

While recent neural audio codecs deliver superior speech quality at ultralow bitrates over traditional methods, their practical adoption is hindered by obstacles related to low-resource operation and robustness to acoustic distortions. Edge…

Neural speech codecs have demonstrated their ability to compress high-quality speech and audio by converting them into discrete token representations. Most existing methods utilize Residual Vector Quantization (RVQ) to encode speech into…

Sound · Computer Science 2024-10-22 Peiji Yang , Fengping Wang , Yicheng Zhong , Huawei Wei , Zhisheng Wang

Recent advancements in end-to-end neural speech codecs enable compressing audio at extremely low bitrates while maintaining high-fidelity reconstruction. Meanwhile, low computational complexity and low latency are crucial for real-time…

Audio and Speech Processing · Electrical Eng. & Systems 2026-01-21 Leyan Yang , Ronghui Hu , Yang Xu , Jing Lu

Neural speech codecs have gained great attention for their outstanding reconstruction with discrete token representations. It is a crucial component in generative tasks such as speech coding and large language models (LLM). However, most…

Sound · Computer Science 2025-07-01 Youqiang Zheng , Weiping Tu , Yueteng Kang , Jie Chen , Yike Zhang , Li Xiao , Yuhong Yang , Long Ma

Ultra-low-bitrate speech coding is pivotal for bandwidth-constrained communication and deep compression, yet maintaining naturalness and speaker identity at such extreme bit budgets remains challenging due to pronounced information loss and…

Audio and Speech Processing · Electrical Eng. & Systems 2026-05-26 Hui-Peng Du , Yang Ai , Xiao-Hang Jiang , Yuan Tian , Zhen-Hua Ling

This paper considers the joint compression and enhancement problem for speech signal in the presence of noise. Recently, the SoundStream codec, which relies on end-to-end joint training of an encoder-decoder pair and a residual vector…

Sound · Computer Science 2025-09-03 Jiayi Huang , Zeyu Yan , Wenbin Jiang , He Wang , Fei Wen

Noise robustness remains a critical challenge for deploying neural speech codecs in real-world acoustic scenarios where background noise is often inevitable. A key observation we make is that even slight input noise perturbations can cause…

Audio and Speech Processing · Electrical Eng. & Systems 2025-10-14 Rui-Chen Zheng , Yang Ai , Hui-Peng Du , Li-Rong Dai

Deep-learning based methods have shown their advantages in audio coding over traditional ones but limited attention has been paid on real-time communications (RTC). This paper proposes the TFNet, an end-to-end neural speech codec with low…

Sound · Computer Science 2022-02-16 Xue Jiang , Xiulian Peng , Chengyu Zheng , Huaying Xue , Yuan Zhang , Yan Lu

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…

The Low-Resource Audio Codec (LRAC) Challenge aims to advance neural audio coding for deployment in resource-constrained environments. The first edition focuses on low-resource neural speech codecs that must operate reliably under everyday…

Sound · Computer Science 2025-10-09 Yusuf Ziya Isik , Rafał Łaganowski

This paper presents FunCodec, a fundamental neural speech codec toolkit, which is an extension of the open-source speech processing toolkit FunASR. FunCodec provides reproducible training recipes and inference scripts for the latest neural…

Sound · Computer Science 2023-10-10 Zhihao Du , Shiliang Zhang , Kai Hu , Siqi Zheng

Large language models (LLMs) have significantly advanced audio processing through audio codecs that convert audio into discrete tokens, enabling the application of language modeling techniques to audio data. However, audio codecs often…

Audio and Speech Processing · Electrical Eng. & Systems 2024-09-19 Edresson Casanova , Ryan Langman , Paarth Neekhara , Shehzeen Hussain , Jason Li , Subhankar Ghosh , Ante Jukić , Sang-gil Lee

Speech tokenization enables discrete representation and facilitates speech language modeling. However, existing neural codecs capture low-level acoustic features, overlooking the semantic and contextual cues inherent to human speech. While…

Large Language Models (LLMs) have significantly advanced audio processing by leveraging audio codecs to discretize audio into tokens, enabling the application of language modeling techniques to speech data. However, existing audio codecs…

Audio and Speech Processing · Electrical Eng. & Systems 2025-08-11 Edresson Casanova , Paarth Neekhara , Ryan Langman , Shehzeen Hussain , Subhankar Ghosh , Xuesong Yang , Ante Jukić , Jason Li , Boris Ginsburg

A good audio codec for live applications such as telecommunication is characterized by three key properties: (1) compression, i.e.\ the bitrate that is required to transmit the signal should be as low as possible; (2) latency, i.e.\…

Audio and Speech Processing · Electrical Eng. & Systems 2023-05-29 Yi-Chiao Wu , Israel D. Gebru , Dejan Marković , Alexander Richard

In bandwidth-constrained communication such as satellite and underwater channels, speech must often be transmitted at ultra-low bitrates where intelligibility is the primary objective. At such extreme compression levels, codecs trained with…

Sound · Computer Science 2026-04-21 Junyi Wang , Chi Zhang , Jing Qian , Haifeng Luo , Hao Wang , Zengrui Jin , Chao Zhang

Large language models (LLMs) have significantly advanced audio processing through audio codecs that convert audio into discrete tokens, enabling the application of language modelling techniques to audio data. However, traditional codecs…

Sound · Computer Science 2024-12-02 Haohe Liu , Xuenan Xu , Yi Yuan , Mengyue Wu , Wenwu Wang , Mark D. Plumbley

This paper introduces a novel neural network-based speech coding system that can process noisy speech effectively. The proposed source-aware neural audio coding (SANAC) system harmonizes a deep autoencoder-based source separation model and…

Audio and Speech Processing · Electrical Eng. & Systems 2020-11-11 Haici Yang , Kai Zhen , Seungkwon Beack , Minje Kim

Neural audio compression has emerged as a promising technology for efficiently representing speech, music, and general audio. However, existing methods suffer from significant performance degradation at limited bitrates, where the available…

Sound · Computer Science 2026-05-08 Jin Wang , Wenbin Jiang , Xiangbo Wang , Yubo You , Sheng Fang
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