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Alexandre Défossez

14 accepted papers

2026

MoshiRAG: Asynchronous Knowledge Retrieval for Full-Duplex Speech Language Models

ICML 2026poster

Speech-to-speech language models have recently emerged to enhance the naturalness of conversational AI. In particular, full-duplex models are distinguished by their real-time interactivity, including handling of pauses, interruptions, and backchannels. However, improving their factuality remains an …

Cited by 0SourceScholar
2026

Simultaneous Speech-to-Speech Translation Without Aligned Data

ICML 2026oral

Simultaneous speech translation is the task of translating source speech into a target language in real-time. Given that the dependencies between source and target words are non-monotonic (e.g. the word order can change between German and English), this means learning to jointly align and translate.…

Cited by 0SourcecodeScholar
2026

Vision-Speech Models: Teaching Speech Models to Converse about Images

CVPR 2026

The recent successes of Vision-Language models raise the question of how to equivalently imbue a pretrained speech model with vision understanding, an important milestone towards building a multimodal speech model able to freely converse about images. Building such a conversational Vision-Speech mod

Cited by 0SourcecodeScholar
2025

Aligning Spoken Dialogue Models from User Interactions

ICML 2025poster

We propose a novel preference alignment framework for improving spoken dialogue models on real-time conversations from user interactions. Current preference learning methods primarily focus on text-based language models, and are not directly suited to the complexities of real-time speech interaction…

Cited by 0SourcePDFScholar
2025

High-Fidelity Simultaneous Speech-To-Speech Translation

ICML 2025poster

We introduce Hibiki, a decoder-only model for simultaneous speech translation. Hibiki leverages a multistream language model to synchronously process source and target speech, and jointly produces text and audio tokens to perform speech-to-text and speech-to-speech translation. We furthermore addres…

2024

An Independence-promoting Loss for Music Generation with Language Models

ICML 2024poster

Music generation schemes using language modeling rely on a vocabulary of audio tokens, generally provided as codes in a discrete latent space learnt by an auto-encoder. Multi-stage quantizers are often employed to produce these tokens, therefore the decoding strategy used for token prediction must b…

Cited by 3SourcePDFScholar
2024

Masked Audio Generation using a Single Non-Autoregressive Transformer

ICLR 2024poster

We introduce MAGNeT, a masked generative sequence modeling method that operates directly over several streams of audio tokens. Unlike prior work, MAGNeT is comprised of a single-stage, non-autoregressive transformer. During training, we predict spans of masked tokens obtained from a masking schedule…

Cited by 50SourcePDFScholar
2024

Proactive Detection of Voice Cloning with Localized Watermarking

ICML 2024poster

In the rapidly evolving field of speech generative models, there is a pressing need to ensure audio authenticity against the risks of voice cloning. We present AudioSeal, the first audio watermarking technique designed specifically for localized detection of AI-generated speech. AudioSeal employs a…

2023

AudioGen: Textually Guided Audio Generation

ICLR 2023poster

In this work, we tackle the problem of generating audio samples conditioned on descriptive text captions. We propose AudioGen, an auto-regressive generative model, operating on a learnt discrete audio representation, that generates audio samples conditioned on text inputs. The task of text-to-audio…

Cited by 400SourcePDFScholar
2023

From Discrete Tokens to High-Fidelity Audio Using Multi-Band Diffusion

NeurIPS 2023poster

Deep generative models can generate high-fidelity audio conditioned on various types of representations (e.g., mel-spectrograms, Mel-frequency Cepstral Coefficients (MFCC)). Recently, such models have been used to synthesize audio waveforms conditioned on highly compressed representations. Although…

Cited by 25SourcePDFScholar
2023

Simple and Controllable Music Generation

NeurIPS 2023poster

We tackle the task of conditional music generation. We introduce MusicGen, a single Language Model (LM) that operates over several streams of compressed discrete music representation, i.e., tokens. Unlike prior work, MusicGen is comprised of a single-stage transformer LM together with efficient toke…

2023

Textually Pretrained Speech Language Models

NeurIPS 2023poster

Speech language models (SpeechLMs) process and generate acoustic data only, without textual supervision. In this work, we propose TWIST, a method for training SpeechLMs using a warm-start from a pretrained textual language models. We show using both automatic and human evaluations that TWIST outperf…