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相关概念视频

Echo01:06

Echo

532
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
532

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相关实验视频

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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使用MEMS扬声器阵列进行准确和低功率超声波无线电频率 (RF) 室内测距.

Chesney Buyle1, Lieven De Strycker1, Liesbet Van der Perre1

  • 1KU Leuven, WaveCore, Department of Electrical Engineering (ESAT), Ghent Technology Campus, 9000 Ghent, Belgium.

Sensors (Basel, Switzerland)
|September 28, 2023
PubMed
概括

阶段式扬声器阵列通过减少干扰来提高能源受限设备的室内定位精度. 这种混合射频声波测距系统达到厘米级的精度,性能优于传统的单扬声器设置.

科学领域:

  • 声学 声学 在声学上
  • 信号处理 信号处理
  • 机器人和自动化 机器人和自动化

背景情况:

  • 准确的室内定位对于各种应用至关重要,包括专业,护理和个人使用.
  • 混合射频声波测距系统为距离测量提供超低能耗,但容易受到多路径干扰.
  • 传统系统使用单个扬声器信标,这可能会限制信号与干扰加噪声比 (SINR) 的性能.

研究的目的:

  • 通过用阶段式扬声器阵列取代单个扬声器,增强混合射频声学测距系统中的SINR.
  • 优化低成本统一平面阵列 (UPA) 的设计,以提高使用超声波声的范围性能.
  • 为了比较优化UPA配置与传统单个扬声器系统的距离精度.

主要方法:

  • 模拟了低成本统一平面阵列 (UPA) 的设计,用于基于超声波声的测距.
  • 研究了分阶段扬声器阵列配置,重点是模拟"鞋盒"环境中的垂直布局.
  • 将优化的UPA与单个扬声器系统的距离性能 (P50,P95,P80错误) 进行了比较.

主要成果:

  • 垂直相位数组配置在高度有限的模拟室内环境中显示了最小的距离误差.
  • 实现了P50距离误差约为3厘米和P95距离误差低于30厘米的优化UPA.
关键词:
在MEMS MEMS中使用.室内定位装置 室内定位装置低功率的低功率电源是什么阶段式扬声器阵列是一个阶段式扬声器阵列.超声波超声波是指超声波的使用.

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  • 与单扬声器系统相比,10×2垂直相位阵列将P80和P95的距离误差降低了多达一个数量级.

    • 结论:

    • 阶段式扬声器阵列显著改善SINR,并减少混合射频声学系统的距离误差.
    • 优化的垂直UPA配置对于精确的能源受限制设备的室内定位非常有效.
    • 拟议的系统为室内范围应用提供了相对于传统单个扬声器方法的显著性能改进.