双麦克风可转向高阶神经差分波束形成器
Dual-Microphone Steerable High-Order Neural Differential Beamformer
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中文总结 AI 辅助
本研究提出一种双麦克风神经差分波束形成器（NDBF），实现可转向的高阶频率不变波束模式，并仅用两个全向麦克风支持立体声录音，实验证明其优于现有方法。
中文摘要 AI 辅助
全向麦克风的线性阵列产生的波束模式关于阵列轴对称。对于这些阵列，如果波束形成器的波束模式在从0°到180°的所有观察方向上在半圆平面内保持相同形状，则该波束形成器被认为是可转向的。对于双麦克风阵列，传统的差分波束形成器通常不可转向且仅限于一阶，这显著限制了空间选择性。为了解决这些限制，本研究提出了一种使用双麦克风阵列的神经差分波束形成器（NDBF）。贡献如下：（i）NDBF是可转向的；（ii）NDBF实现了高阶频率不变的波束模式；（iii）NDBF仅使用两个紧密间隔的全向麦克风即可实现立体声录音。实验结果表明，NDBF在克服经典差分波束形成的局限性的同时，优于现有方法。
英文摘要
Linear arrays of omnidirectional microphones produce beampatterns that are symmetric about the array axis. For these arrays, a beamformer is considered steerable if its beampattern maintains the same shape in the semicircular plane across all look directions from 0° to 180°. For dual-microphone arrays, conventional differential beamformers are generally non-steerable and restricted to first-order, which significantly limits spatial selectivity. To address these limitations, this study presents a neural differential beamformer (NDBF) with a dual-microphone array. The contributions are as follows: (i) NDBF is steerable; (ii) NDBF achieves high-order frequency-invariant beampatterns; and (iii) NDBF enables stereo recording using only two closely spaced omnidirectional microphones. Experimental results demonstrate that NDBF outperforms existing methods while overcoming the limitations of classical differential beamforming.
