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相关概念视频

Downsampling01:20

Downsampling

135
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
135
Upsampling01:22

Upsampling

214
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
214

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相关实验视频

Updated: Jun 13, 2025

Author Spotlight: Enhancement of Salient Object Detection for Smart Grid Applications
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混合多分辨率网络用于DAS数据的拒绝.

Li Ding1, Haoran Sun2, Haoliang Chen3

  • 1School of Software Engineering, Jilin Technology College of Electronic Information, Jilin, China.

PloS one
|June 10, 2025
PubMed
概括
此摘要是机器生成的。

分布式声学传感 (DAS) 地震数据经常受到噪音的影响,从而掩盖了有价值的信息. 这项研究引入了一个混合多分辨率网络 (HMR-Net),以有效地消除DAS记录并提高地震勘探的信号质量.

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科学领域:

  • 地质物理学 地质物理学
  • 地震勘探 - 地震勘探
  • 信号处理 信号处理

背景情况:

  • 分布式声学传感 (DAS) 在地震勘探中提供了巨大的潜力.
  • 现实世界DAS地震数据经常受到大量噪音的污染,降低了数据质量,并阻碍了后续分析.
  • 现有的否定方法很难在杂的DAS记录中有效地保存微妙的地震信号.

研究的目的:

  • 为分布式声学传感 (DAS) 地震数据开发一种有效的无声化方法.
  • 为应对噪声隐藏有价值信息并降低DAS记录中的信号噪声比率 (SNR) 的挑战.
  • 提高地震数据处理和解释任务的性能.

主要方法:

  • 提议一个混合多分辨率网络 (HMR-Net) 用于DAS数据的泄露.
  • HMR-Net通过多个分辨率提取特征以捕捉复杂的地震特征.
  • 采用耐错误的上采样和下采样,以优化特征提取并最大限度地减少采样引起的损失.
  • 使用合成数据集,结合真实DAS噪声和模拟的地震记录进行训练和验证.

主要成果:

  • 在DAS地震记录中显示出相当大的噪声抑制.
  • 显著提高了处理的地震数据的信号噪声比 (SNR).
  • 在合成和实际现场地震记录上验证了有效性.

结论:

  • 拟议的HMR-Net是消除DAS地震数据的有效方法.
  • 该网络成功地保护和增强了潜在的地震信号.
  • 这种方法提高了使用DAS技术进行地震勘探的可靠性.