G-Mamba: Sparse Graph-Guided Mamba for Audio-Visual Speech Enhancement
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Electrical Engineering and Systems Science > Audio and Speech Processing
Title:G-Mamba: Sparse Graph-Guided Mamba for Audio-Visual Speech Enhancement
Abstract:Lightweight audio-visual speech enhancement (AVSE) models face a critical trade-off between computational efficiency and cross-modal alignment accuracy. While simple concatenation lacks relational expressiveness, dense cross-attention incurs computational overhead and is prone to unreliable cross-modal correspondence under strong acoustic interference. We propose Sparse Graph-Guided Mamba (SG-Mamba), a lightweight AVSE framework that integrates a sparse heterogeneous graph with a linear-complexity Mamba backbone. The graph explicitly models modality-specific relations through content-adaptive attention and cross-frame audio-visual connections, while Mamba captures long-range temporal context. We further introduce an audio skip connection to preserve spectral detail without sacrificing noise suppression. Evaluated on LRS3, SG-Mamba achieves competitive or superior performance against strong lightweight baselines and reaches 13.091 dB SI-SDR under noise-only condition. It also remains robust in cluttered multi-speaker conditions with a competitive cost of 3.45 G MACs (or 6.90 G FLOPs). Results on VoxCeleb2 further suggest that explicit structural priors improve robustness, generalizability, and computational efficiency in lightweight AVSE.
| Comments: | Accepted to IEEE SLT 2026 |
| Subjects: | Audio and Speech Processing (eess.AS); Computation and Language (cs.CL); Sound (cs.SD) |
| Cite as: | arXiv:2609.18009 [eess.AS] |
| (or arXiv:2609.18009v1 [eess.AS] for this version) | |
| https://doi.org/10.48550/arXiv.2609.18009
arXiv-issued DOI via DataCite (pending registration)
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