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相关概念视频

Reconstruction of Signal using Interpolation01:10

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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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.
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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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相关实验视频

Updated: Jul 13, 2025

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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声场重建使用前置球形波函数和稀疏规则化.

Xuxin Zhang1, Jingjun Lou2, Shijian Zhu2

  • 1College of Power Engineering, Naval University of Engineering, 717 Liberation Avenue, Wuhan 430033, China.

Sensors (Basel, Switzerland)
|October 14, 2023
PubMed
概括

这项研究引入了一种新的方法,用于使用前置球形波函数 (PSWF) 和直角匹配追求 (OMP) 算法来重建声音场. 该方法准确地重建了对较少样本的长长源的声音,在各种条件下证明有效.

关键词:
近场声学全息学近场声学全息学直角匹配的追求追求扩大球形波函数的作用.稀疏的规范化 稀疏的规范化

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科学领域:

  • 声学 声学 在声学上
  • 信号处理 信号处理
  • 计算物理 计算物理

背景情况:

  • 近场声学全息 (NAH) 依赖于压缩传感 (CS) 以进行有限采样的声音场重建.
  • 有效的NAH需要最佳的空间基础选择和强大的稀疏规范化.
  • 从长长的源头重建声场带来独特的挑战.

研究的目的:

  • 为延长的声音源提出一种新的声场重建方法.
  • 为了提高近场声学全息的准确性和效率.
  • 为了提高性能,利用前置球形波函数 (PSWF) 和直角匹配追求 (OMP).

主要方法:

  • 拟议的方法结合了前置球形波函数 (PSWFs) 作为稀疏的空间基础与直角匹配追求 (OMP) 算法.
  • 使用PSWF来表示辐射的声音场,由OMP确定稀疏系数.
  • OMP通过在线性子空间中匹配剩余错误来识别重要组件,并使用停止规则来防止错误.

主要成果:

  • 使用直线阵列源模型进行的数值模拟证明了在有限数量的样本中准确地重建了声压.
  • 该方法在广泛的频率范围,多样化的阵列配置和不同的采样数量中显示出强度.
  • 实验验证证了拟议的声音场重建技术的可行性和可靠性.

结论:

  • PSWF和OMP的组合为延长的声音源的近场声学全息提供了一个有效的解决方案.
  • 提出的方法实现了高精度和稳定性,即使采样稀疏.
  • 该技术提供了一种可靠的方法,用于在各种声学场景下进行详细的声场分析.