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Multilingual Word-Level Forced Alignment with Self-Supervised Representations and Learned Dynamic Programming

2026-06-09 10:27:59
Roy Weber, Meidan Zehavi, Rotem Rousso, Joseph Keshet
arXiv_CL
           
Abstract

We present a method for accurate multilingual word-level forced alignment, consisting of an alignment encoder and a learned alignment decoder. The encoder integrates two representations: one from the Massively Multilingual Speech (MMS) model and another from a self-supervised phoneme boundary detector (UnSupSeg). It learns to fuse them and to estimate word-boundary probabilities over long temporal contexts. The alignment decoder is a learned dynamic programming that combines encoder outputs with segmental features over the MMS and UnSupSeg representations to infer final word boundaries. Trained iteratively on TIMIT and Buckeye, the proposed approach outperforms Montreal Forced Aligner (MFA) and MMS-based alignment on both datasets. On unseen languages (Dutch, German, and Hebrew), the proposed model achieves performance consistently better than or on par with existing alignment approaches, indicating its potential to scale to 1100+ languages supported by MMS without further training.

Abstract (translated)

URL

https://arxiv.org/abs/2606.10675

PDF

https://arxiv.org/pdf/2606.10675.pdf

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