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arXiv · 2506.07294

Towards Generalized Source Tracing for Codec-Based Deepfake Speech

Xuanjun Chen·I-Ming Lin·Lin Zhang·Haibin Wu·Hung-yi Lee·Jyh-Shing Roger Jang
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Abstract

Recent attempts at source tracing for codec-based deepfake speech (CodecFake), generated by neural audio codec-based speech generation (CoSG) models, have exhibited suboptimal performance. However, how to train source tracing models using simulated CoSG data while maintaining strong performance on real CoSG-generated audio remains an open challenge. In this paper, we show that models trained solely on codec-resynthesized data tend to overfit to non-speech regions and struggle to generalize to unseen content. To mitigate these challenges, we introduce the Semantic-Acoustic Source Tracing Network (SASTNet), which jointly leverages Whisper for semantic feature encoding and Wav2vec2 with AudioMAE for acoustic feature encoding. Our proposed SASTNet achieves state-of-the-art performance on the CoSG test set of the CodecFake+ dataset, demonstrating its effectiveness for reliable source tracing.

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BibTeXRIS

Xuanjun Chen, I-Ming Lin, Lin Zhang, Haibin Wu, Hung-yi Lee, Jyh-Shing Roger Jang. 2025-06-08. Towards Generalized Source Tracing for Codec-Based Deepfake Speech. https://arxiv.org/abs/2506.07294

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