Abstract The logarithmic spiral has become a common design archetype for the placement of microphones in microphone array systems. Such designs tend to perform well; however, when the diameter of the array is increased to improve the array’s angular resolution, the portability and convenience of the array are significantly compromised. Large spiral-based arrays of more than a few meters in diameter are unwieldy to transport and time-consuming to set up once the array has been transported to the test location. The purpose of this investigation is to serve as a proof of concept to establish the anticipated performance of a new hybrid spiral microphone array. This hybrid microphone array design will combine the portability and convenience benefits of smaller spiral array designs with the performance characteristics of larger arrays. Four modified spiral microphone arrays are proposed. The candidate arrays are constructed by placing microphones exclusively on the axes at the points where the spiral geometries intercept the axes. The resulting arrays are modular, enabling the arrays to be quickly dis-assembled, transported, and re-assembled. The candidate array designs are subjected to a battery of angular resolution testing, and the results are compared with standard existing array designs.

中文翻译：

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性能和便携性的混合螺旋麦克风阵列设计

摘要 对数螺旋已成为麦克风阵列系统中麦克风放置的常见设计原型。这样的设计往往表现良好；然而，当增加阵列的直径以提高阵列的角分辨率时，阵列的便携性和便利性会受到显着影响。直径超过几米的基于螺旋的大型阵列运输不便，并且一旦将阵列运输到测试位置，则设置起来也很耗时。本次调查的目的是作为概念证明，以确定新型混合螺旋麦克风阵列的预期性能。这种混合麦克风阵列设计将小型螺旋阵列设计的便携性和便利性优势与大型阵列的性能特征相结合。提出了四种改进的螺旋麦克风阵列。候选阵列是通过将麦克风专门放置在轴上螺旋几何形状与轴相交的点上来构建的。由此产生的阵列是模块化的，使阵列能够快速拆卸、运输和重新组装。候选阵列设计经过一系列角分辨率测试，并将结果与​​标准现有阵列设计进行比较。