Method for indicating electromyographic signal interference and method for removing interference

A technology for myoelectric signal and interference removal, which is applied in medical science, sensors, diagnostic recording/measurement, etc., and can solve problems such as distinguishing interference and difficulty

Active Publication Date: 2014-01-08
NANJING VISHEE MEDICAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even in equipment with spectrum analysis, sometimes it is difficult to distinguish interferences through spectrogram due to the non-engineering background of doctors

Method used

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  • Method for indicating electromyographic signal interference and method for removing interference
  • Method for indicating electromyographic signal interference and method for removing interference
  • Method for indicating electromyographic signal interference and method for removing interference

Examples

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Embodiment 1

[0030] Embodiment 1: The following takes the surface electromyography analysis system as an example to illustrate the existence of interference. The system has used the 50Hz notch function, and the 50Hz power frequency interference has been filtered out. figure 1 It is the original peak-to-peak signal collected by the system with little interference, the peak value is about 40uV, figure 2 For the RMS signal, about 13uV, image 3 for the spectrogram. In the case of little interference, the collected surface electromyography RMS value is about 10uV, which is the electrical signal of the patient's real muscle contraction. It can be seen from the spectrum diagram that the signal energy values ​​are in the range of 20-50Hz, and most of the energy is concentrated in the range of 30-250Hz, which is a typical surface electromyography signal spectrum. In the case of interference, the patient did not contract the muscles, but the signal amplitude was generated due to the interferenc...

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Abstract

The invention discloses a method for indicating electromyographic signal interference. The method comprises the following steps that (1) in a time frame t, the sampling value sequence x (t) of electromyographic signals is obtained, and t=1-10s; (2) the power spectrum P (f) and the total power Tp of the electromyographic signals are calculated; (3) in the bandwidth range of the electromyographic signals, the power values P50, P (n*50) of 50Hz and the frequency doubling (n*50) Hz are determined, and n is a natural number larger than 1; (4) the percent K of the sum of the power values of 50Hz and the frequency doubling (n*50) Hz accounted for in the total power Tp is calculated, and Q=100-K; (5) the value of K or the value of Q is indicated for a user. The invention further discloses a method for removing the electromyographic signal interference according to the indicating method. The method for indicating the electromyographic signal interference helps a doctor to judge the reliability of the signals and provides a basis for interference removal, and therefore the reliable signals can be obtained under the condition of removing 50Hz and the harmonic energy as less as possible.

Description

technical field [0001] The invention relates to an indication method for myoelectric signal interference, which is used for collection and analysis of human body electromyographic signals of medical equipment and biofeedback training equipment. Background technique [0002] Because the human body's bioelectrical signal is very weak, for example, the amplitude of the EEG signal is between 5uV-100uV, the electrocardiographic signal is between 10uV-10mV, and the electromyographic signal is between 2uV-10mV. All these bioelectrical signals are easily affected by the outside world. Electromagnetic wave interference, especially 50Hz power frequency and its harmonics. Equipment manufacturers try their best to improve the anti-interference ability of the equipment, such as improving the common mode rejection ratio of the equipment and adding a 50Hz power frequency trap circuit. However, the strength of interference signals in different environments is different, and it is still imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0488
Inventor 史志怀杨瑞嘉王健
Owner NANJING VISHEE MEDICAL TECH
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