圆形传声器阵列的三角插值波束形成

C. Schuldt
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引用次数: 3

摘要

多项式波束形成先前被提出用于解决声学回波抵消与自适应麦克风波束形成相结合的非平凡问题。本文展示了一个圆形阵列的设计示例,其中传统的多项式波束形成方法在设计间隔的边缘表现出严重(超过10 dB)指向性指数(DI)振荡,导致某些外观方向的严重DI退化。提出了一种基于三角插值的解决方案,该方案可以显著地稳定振荡,从而使所有方向上的DI与固定波束形成器的DI仅偏离约1db。
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Trigonometric Interpolation Beamforming for a Circular Microphone Array
Polynomial beamforming has previously been proposed for addressing the non-trivial problem of integrating acoustic echo cancellation with adaptive microphone beamforming. This paper demonstrates a design example for a circular array where traditional polynomial beamforming approaches exhibit severe (over 10 dB) directivity index (DI) oscillations at the edges of the design interval, leading to severe DI degradation for certain look directions. A solution, based on trigonometric interpolation, is proposed that stabilizes the oscillations significantly, resulting in a DI that deviates only about 1 dB from that of a fixed beamformer over all look directions.
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