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This research introduces supervised contrastive learning as a lightweight regularization technique to enhance automatic speech recognition (ASR) systems against accent variability without altering model architecture. By stabilizing encoder representations, the method achieves significant word error rate reductions on unseen accents across multiple pre-trained models, offering an effective strategy for building more inclusive ASR technologies.
Contrastive Regularization for Accent-Robust ASR
arXiv:2605.03297v2 Announce Type: replace-cross Abstract: ASR systems based on self-supervised acoustic pretraining and CTC fine-tuning achieve strong performance on native speech but remain sensitive to accent variability. We investigate supervised contrastive learning (SupCon) as a lightweight, accent-invariant auxiliary objective for CTC fine-tuning. An utterance-level contrastive loss regularizes encoder representations without architectural modification or explicit accent supervision. Experiments on the L2-ARCTIC benchmark show consistent WER reductions across multiple pretrained encoders, with up to 25 -- 29\% relative reduction under unseen-accent evaluation. Analysis using within-transcript cosine dispersion indicates that SupCon promotes more compact and stable representation geometry under accent variability. Overall, SupCon provides an effective and model-agnostic regularization strategy for improving accent robustness.
Abstract:ASR systems based on self-supervised acoustic pretraining and CTC fine-tuning achieve strong performance on native speech but remain sensitive to accent variability. We investigate supervised contrastive learning (SupCon) as a lightweight, accent-invariant auxiliary objective for CTC fine-tuning. An utterance-level contrastive loss regularizes encoder representations without architectural modification or explicit accent supervision. Experiments on the L2-ARCTIC benchmark show consistent WER reductions across multiple pretrained encoders, with up to 25 -- 29\% relative reduction under unseen-accent evaluation. Analysis using within-transcript cosine dispersion indicates that SupCon promotes more compact and stable representation geometry under accent variability. Overall, SupCon provides an effective and model-agnostic regularization strategy for improving accent robustness.
Sound (cs.SD); Machine Learning (cs.LG)
arXiv:2605.03297 [cs.SD]
(or arXiv:2605.03297v2 [cs.SD] for this version)
https://doi.org/10.48550/arXiv.2605.03297 Focus to learn more arXiv-issued DOI via DataCite
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