Before the Warning Comes Too Late: Incremental Phone-Scam Detection from Speech
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Computer Science > Computation and Language
arXiv:2609.20223 (cs)
[Submitted on 28 Jul 2026]
Title:Before the Warning Comes Too Late: Incremental Phone-Scam Detection from Speech
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Abstract:We study weakly supervised incremental telecom fraud detection from raw telephone audio, where training provides only conversation-level labels and predictions must be updated before a call ends. We introduce StreamFraudNet, which processes incoming audio through overlapping bounded-context windows using a frozen self-supervised speech encoder, recurrent temporal modeling, and learned aggregation of latent window scores. On a controlled English benchmark, StreamFraudNet achieves a ROC--AUC of \(0.9953\), significantly outperforming acoustic and mean-pooling baselines while remaining competitive with strong global temporal models. The model produces its first prediction after 10 seconds of audio, updates every 2 seconds, and operates faster than real time on the evaluated server hardware. Ablations identify recurrent temporal context as the principal contributor to performance. These results demonstrate that fraud risk can be scored incrementally from raw speech without transcripts or temporal annotations, while highlighting the need for latency-aware training to improve early prediction.
| Subjects: | Computation and Language (cs.CL) |
| Cite as: | arXiv:2609.20223 [cs.CL] |
| (or arXiv:2609.20223v1 [cs.CL] for this version) | |
| https://doi.org/10.48550/arXiv.2609.20223
arXiv-issued DOI via DataCite (pending registration)
|
Submission history
From: Khang Vo Hoang Nhat [view email][v1] Tue, 28 Jul 2026 03:12:05 UTC (1,562 KB)
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View a PDF of the paper titled Before the Warning Comes Too Late: Incremental Phone-Scam Detection from Speech, by Khang Nhat Hoang Vo and 3 other authors
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