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arXiv · 2609.30983

Tracing and Relearning Detection Evidence in Text-to-Speech Systems

Eunji Shin·Kyudan Jung·Jihwan Kim·Minwoo Lee·Jaegul Choo
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Abstract

Recent audio deepfake detectors separate bona fide speech from synthetic speech, yet it remains unclear which stage of a text-to-speech system supplies the detection evidence. We address this with controlled resynthesis and detector adaptation in an F5-TTS-BigVGAN pipeline. Since vocoder reconstruction of a real mel can itself be separable from the source utterance, we fix the vocoder and trace the larger change in detector separation to acoustic generation. Adversarially fine-tuning the acoustic model, with no detector in its objective, raises EER against fixed detectors at comparable quality. However, adapting a detector only on the tuned model's VCTK outputs lowers its LibriSpeech EER from 19.42% to 7.46% and improves detection of unseen base F5-TTS outputs. These results suggest that acoustic-model updates can reduce the detection evidence available to fixed detectors, while detector adaptation keeps the updated outputs detectable in this pipeline.

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Eunji Shin, Kyudan Jung, Jihwan Kim, Minwoo Lee, Jaegul Choo. 2026-09-25. Tracing and Relearning Detection Evidence in Text-to-Speech Systems. https://arxiv.org/abs/2609.30983

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