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arXiv · 2509.17490

FUN-SSL: Full-band Layer Followed by U-Net with Narrow-band Layers for Multiple Moving Sound Source Localization

Yuseon Choi·Hyeonseung Kim·Jewoo Jun·Jong Won Shin
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Abstract

Dual-path processing along the temporal and spectral dimensions has shown to be effective in various speech processing applications. While the sound source localization (SSL) models utilizing dual-path processing such as the FN-SSL and IPDnet demonstrated impressive performances in localizing multiple moving sources, they require significant amount of computation. In this paper, we propose an architecture for SSL which introduces a U-Net to perform narrow-band processing in multiple resolutions to reduce computational complexity. The proposed model replaces the full-narrow network block in the IPDnet consisting of one full-band LSTM layer along the spectral dimension followed by one narrow-band LSTM layer along the temporal dimension with the FUN block composed of one Full-band layer followed by a U-net with Narrow-band layers in multiple scales. On top of the skip connections within each U-Net, we also introduce the skip connections between FUN blocks to enrich information. Experimental results showed that the proposed FUN-SSL outperformed previously proposed approaches with computational complexity much lower than that of the IPDnet.

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Yuseon Choi, Hyeonseung Kim, Jewoo Jun, Jong Won Shin. 2025-09-22. FUN-SSL: Full-band Layer Followed by U-Net with Narrow-band Layers for Multiple Moving Sound Source Localization. https://arxiv.org/abs/2509.17490

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