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相关概念视频

Design Example01:23

Design Example

316
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
316
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

85
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
85

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Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System
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稀缺的扬声器阵列设计用于带宽频率不变光束形成与多个目标.

Keyu Pan1, Simiao Chen1, Yiming Han1

  • 1Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China.

The Journal of the Acoustical Society of America
|January 21, 2025
PubMed
概括

这项研究引入了一种用于设计稀疏扬声器阵列的新方法,这些阵列可以有效地创建多个声音束. 这种方法可以减少所需的驱动器数量,同时保持声音质量,节省成本和设计时间.

科学领域:

  • 声学 声学 在声学上
  • 信号处理 信号处理
  • 阵列设计 阵列设计

背景情况:

  • 目前的稀疏阵列设计方法优化单向,限制多通道音响系统.
  • 多个方向的宽带频率不变光束成形对于先进的声音应用至关重要.

研究的目的:

  • 为稀疏扬声器线路阵列提出一种新的设计方法.
  • 在多个目标方向实现宽带不变频束.
  • 为了减少光束成型系统中的驱动器数量和计算成本.

主要方法:

  • 开发了一个被挖掘的延迟线模型.
  • 提出了一种两阶段的设计方法:压力传感与扩展的快速代收缩值算法用于驾驶员放置,其次是驾驶员激发的最小平方.
  • 数字模拟用于验证.

主要成果:

  • 与统一的线性数组相比,驾驶员数量减少了32.3%.
  • 保持了频率不变的光束特性.
  • 该算法展示了显著的计算效率.

结论:

  • 拟议的方法使稀疏扬声器阵列的高效设计能够实现多方向光束成形.

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  • 这种方法适用于声音投影,并且可以扩展到其他多通道光束成形系统.
  • 该方法可以降低系统成本和设计时间,同时确保可靠的光束性能.