NDF+: Joint Neural Directional Filtering and Diffuse Sound Extraction
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911657122332672 |
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| author | Huang, Weilong Huynh, Le Nhat Tam Thiergart, Oliver Habets, Emanuël A. P. |
| author_facet | Huang, Weilong Huynh, Le Nhat Tam Thiergart, Oliver Habets, Emanuël A. P. |
| contents | Recently, neural directional filtering (NDF) has been introduced as a flexible approach for reconstructing a virtual directional microphone (VDM) with a desired directivity pattern for spatial sound capture. Building on this idea, we propose NDF+, which enables joint neural directional filtering and diffuse sound extraction. NDF+ reformulates VDM estimation into two coupled subtasks: dereverberated VDM reconstruction and diffuse sound extraction. This reformulation enables NDF+ to manipulate diffuse components in the final reconstructed VDM output. We evaluated NDF+ under reverberant conditions and compared it with representative conventional baselines. Results show that NDF+ consistently outperforms the baselines on both subtasks, while maintaining VDM reconstruction quality comparable to that of the original single-task NDF model. These findings indicate that NDF+ introduces an additional degree of freedom for diffuse sound control in the VDM reconstruction. In a stereo recording application, NDF+ provides controllable inter-channel level differences between left and right channels by adjusting the estimated diffuse component. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_06108 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | NDF+: Joint Neural Directional Filtering and Diffuse Sound Extraction Huang, Weilong Huynh, Le Nhat Tam Thiergart, Oliver Habets, Emanuël A. P. Audio and Speech Processing Recently, neural directional filtering (NDF) has been introduced as a flexible approach for reconstructing a virtual directional microphone (VDM) with a desired directivity pattern for spatial sound capture. Building on this idea, we propose NDF+, which enables joint neural directional filtering and diffuse sound extraction. NDF+ reformulates VDM estimation into two coupled subtasks: dereverberated VDM reconstruction and diffuse sound extraction. This reformulation enables NDF+ to manipulate diffuse components in the final reconstructed VDM output. We evaluated NDF+ under reverberant conditions and compared it with representative conventional baselines. Results show that NDF+ consistently outperforms the baselines on both subtasks, while maintaining VDM reconstruction quality comparable to that of the original single-task NDF model. These findings indicate that NDF+ introduces an additional degree of freedom for diffuse sound control in the VDM reconstruction. In a stereo recording application, NDF+ provides controllable inter-channel level differences between left and right channels by adjusting the estimated diffuse component. |
| title | NDF+: Joint Neural Directional Filtering and Diffuse Sound Extraction |
| topic | Audio and Speech Processing |
| url | https://arxiv.org/abs/2605.06108 |