Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

254
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...
254
Upsampling01:22

Upsampling

266
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...
266
Downsampling01:20

Downsampling

196
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...
196
Reducing Line Loss01:18

Reducing Line Loss

176
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss...
176
Interference: Path Lengths01:10

Interference: Path Lengths

1.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.3K
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

5.3K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.3K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Off-target inhibition of PKA RII by crizotinib leads to reduced hERG expression and acquired QT prolongation.

Heart rhythm·2026
Same author

Drug Interactions of Vebreltinib, a Novel Type I c-Met Inhibitor, Coadministration With Rifampin or Itraconazole in Healthy Participants.

Clinical and translational science·2026
Same author

Second-scale synthesis of oxygen-doped carbon nanotubes for oxygen reduction to hydrogen peroxide and valorization.

Science bulletin·2026
Same author

Risk stratification of 1-year atrial tachyarrhythmia recurrence after ablation in patients with persistent atrial fibrillation: ALADS-AF score.

BMC cardiovascular disorders·2026
Same author

Epithelial and Interstitial Gli2 Activation Correlates With Renal Tubulointerstitial Fibrosis and Facilitates FoxM1-Associated Myofibroblast Phenotypic Transition.

FASEB journal : official publication of the Federation of American Societies for Experimental Biology·2026
Same author

Development and validation of an explainable prediction model for post-stroke epilepsy in patients with ischaemic stroke following mechanical thrombectomy: a multicentre retrospective cohort study.

Stroke and vascular neurology·2026

相关实验视频

Updated: Jul 27, 2025

Extraction of the EPP Component from the Surface EMG
07:16

Extraction of the EPP Component from the Surface EMG

Published on: December 16, 2009

12.6K

减少基于同步压缩波形变换的sEMG信号的电力线干扰.

Jingcheng Chen1,2, Yining Sun1,2, Shaoming Sun1,2,3

  • 1Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Sensors (Basel, Switzerland)
|June 10, 2023
PubMed
概括

一个新的基于同步挤压小波变换 (SWT) 的波器有效地消除了电力线干扰 (PLI) 从表面电肌图 (sEMG) 信号. 这种新的方法优于传统的过技术,保持信号完整性,以便更好地分析.

关键词:
适应式峰提取 适应式峰提取电力线路干扰干扰的情况.表面电力学图 (surface electromyography) 是一种表面电力学图.同步挤压的波段变换.

更多相关视频

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography
09:42

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

630
Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation
09:36

Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation

Published on: May 12, 2014

13.9K

相关实验视频

Last Updated: Jul 27, 2025

Extraction of the EPP Component from the Surface EMG
07:16

Extraction of the EPP Component from the Surface EMG

Published on: December 16, 2009

12.6K
Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography
09:42

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography

Published on: January 24, 2025

630
Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation
09:36

Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation

Published on: May 12, 2014

13.9K

科学领域:

  • 生物医学工程 生物医学工程
  • 信号处理 信号处理
  • 电子生理学 电子生理学

背景情况:

  • 电力线干扰 (PLI) 由于重叠的带宽,显著破坏了表面肌电图 (sEMG) 信号.
  • 现有的方法,如口过和光谱插曲,在完全去除PLI而不会扭曲sEMG信号或处理时间变化的干扰的情况下存在局限性.

研究的目的:

  • 开发一种新且有效的过器,用于从表面电肌图 (sEMG) 信号中去除电力线干扰 (PLI).
  • 解决传统的PLI移除技术的局限性,特别是关于信号扭曲和时间变化的干扰.

主要方法:

  • 开发了一种基于同步挤压小波形变换 (SWT) 的新型过器,其中包含本地SWT,以减少计算和保持频率分辨率.
  • 提出了一种基于值的适应性山脊定位方法和两种不同的山脊提取方法 (REM),以满足各种应用需求.
  • 拟议过器的性能经过严格评估,与隙过和光谱插值对比,使用模拟和真实sEMG信号.

主要成果:

  • 拟议的基于SWT的过器与传统方法相比,实现了更高的性能,正如定量指标和时间频谱分析所证明的那样.
  • 过器显示信号与噪声比 (SNR) 显著改善,两个拟议的REMs的范围为18.53-24.57和18.57-26.92.
  • 开发的过器有效地减轻了电力线干扰,同时保持了底层sEMG信号的完整性.

结论:

  • 新型基于同步挤压小波形变换 (SWT) 的过器在消除sEMG信号的电力线干扰方面取得了重大进展.
  • 这种方法提供了比现有技术更强大和更准确的解决方案,特别是对于时间变化的干扰和最大限度地减少信号扭曲.
  • 拟议的过器提高了对各种生物医学应用的sEMG信号分析的可靠性.