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XSQ-AST: An Explainable Audio Spectrogram Transformer Framework for Localising Synthetic Speech Artifacts

2026-09-21 15:38:11
Ben Heritage, Luca Resti, M\'onica Villanueva Aylagas, Timothy Mehlenbacher, Konrad Tollmar, James Alfred Walker
arXiv_SD
         
Abstract

Localising artifacts in synthetic speech remains challenging, as most evaluation methods yield only global quality scores. This paper presents XSQ-AST, a framework that combines the SQ-AST speech quality model with WhisperX phoneme alignment and multiple saliency methods to produce temporally localised artifact diagnostics without model retraining. Saliency maps are projected onto continuous distributions via kernel density estimation and onto phoneme boundaries via phoneme-discretised saliency maps. A 40-participant listening test validated the framework across five perceptual dimensions. Attention Rollout, Attention Flow and an adapted GradCAM produced temporal distributions that correlated with listener highlights, with different methods best suited to different artifact types. An AUC-ROC analysis confirmed discrimination above chance.

Abstract (translated)

URL

https://arxiv.org/abs/2609.24770

PDF

https://arxiv.org/pdf/2609.24770.pdf

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