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相关概念视频

Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

57
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
57

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基于触线方法的麦克风阵列.

Tsutomu Kaizuka1

  • 1Department of Mechanical Science and Engineering, Kogakuin University 2665-1 Nakano-machi, Hachioji-shi, Tokyo 192-0015, Japan.

The Journal of the Acoustical Society of America
|January 19, 2024
PubMed
概括

应用于麦克风阵列的触线方法 (TLM) 创造了更好地聚焦的声音束. 与传统的延迟和总和方法相比,这种固定光束变频器提供了更好的定向性和距离歧视.

科学领域:

  • 声学 声学 在声学方面
  • 信号处理 信号处理

背景情况:

  • 触线方法 (TLM) 最初是为扬声器阵列开发的,用于创建曲的声音束.
  • 麦克风阵列通常使用延迟和总和 (DAS) 波束造型器进行定向声音捕获.

研究的目的:

  • 为适应触线方法 (TLM) 在麦克风阵列中的应用.
  • 评估基于TLM的麦克风阵列的性能,以形成曲线声波束.

主要方法:

  • 利用互惠原则将TLM应用到麦克风阵列中.
  • 使用延迟和总和 (DAS) 束造型器生成直接线束.
  • 形成曲线梁作为这些触线的包裹.
  • 优化了基于平均频率的曲线轨迹,以最大限度地提高声音对比度.

主要成果:

  • 基于TLM的麦克风阵列可以形成曲线光束,与DAS光束造型器相比,可以改善距离区分.
  • 案例研究表明,与DAS相比,TLM具有更高的指导性.
  • 优化的TLM实现了固定束成型,提高了性能和实施简单性.

结论:

  • 频率平均的最佳TLM为麦克风阵列提供了一个固定的光束成形解决方案.

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  • 这种方法提供了优越的声学性能和与DAS光束造型器相比较的实施简单性.