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FunCodec: A Fundamental, Reproducible and Integrable Open-source Toolkit for Neural Speech Codec

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arxiv 2309.07405 v2 pith:XP4ZVIT5 submitted 2023-09-14 cs.SD cs.AIeess.AS

classification cs.SDcs.AIeess.AS
keywords funcodecspeechmodelstoolkitcodecneuralachievedownstream
verification ladder T0 review T1 audit T2 compute T3 formal
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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 speech codec models, such as SoundStream and Encodec. Thanks to the unified design with FunASR, FunCodec can be easily integrated into downstream tasks, such as speech recognition. Along with FunCodec, pre-trained models are also provided, which can be used for academic or generalized purposes. Based on the toolkit, we further propose the frequency-domain codec models, FreqCodec, which can achieve comparable speech quality with much lower computation and parameter complexity. Experimental results show that, under the same compression ratio, FunCodec can achieve better reconstruction quality compared with other toolkits and released models. We also demonstrate that the pre-trained models are suitable for downstream tasks, including automatic speech recognition and personalized text-to-speech synthesis. This toolkit is publicly available at https://github.com/alibaba-damo-academy/FunCodec.

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Cited by 4 Pith papers

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  1. Codec-Robust Attacks on Audio LLMs

    cs.SD 2026-05 unverdicted novelty 7.0 of 10

    CodecAttack perturbs audio in codec latent space with multi-bitrate EoT to achieve 85.5% average ASR on Opus-compressed Audio LLMs versus under 26% for waveform baselines, with transfer to MP3 and AAC.

  2. DASB - Discrete Audio and Speech Benchmark

    cs.SD 2024-06 unverdicted novelty 7.0 of 10

    DASB is a new benchmark for discrete audio tokens showing semantic tokens outperform acoustic ones but discrete representations remain less robust than continuous features across domains.

  3. Codec-Robust Attacks on Audio LLMs

    cs.SD 2026-05 unverdicted novelty 6.0 of 10

    CodecAttack optimizes perturbations in neural audio codec latent space to reach 85.5% average target-substring ASR on compressed Opus audio while waveform baselines stay below 26%.

  4. Two-Dimensional Quantization for Geometry-Aware Audio Coding

    cs.SD 2025-12 unverdicted novelty 6.0 of 10

    Q2D2 uses 2D geometric grid projections to quantize feature pairs in neural audio codecs, yielding implicit codebooks that improve efficiency and utilization over RVQ, VQ, and FSQ while maintaining reconstruction quality.

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