Towards Generalized Source Tracing for Codec-Based Deepfake Speech

--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. T o 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 CodecF ake+dataset, demonstrating its effectiveness for reliable source tracing. Deepfake detection determines whether the given speech is a bona fide speech or a deepfake speech. Recently, attention has shifted from merely detecting deepfake speech to tracing its source.