Control method and system for filtering out power frequency interference signals

Abstract

The invention relates to a control method and system for filtering out power frequency interference signals. The control method comprises the steps of firstly rectificating an electrocardiosignal of apreset section of each channel; and then obtaining frequency, range and phase of the rectificated power frequency interference signals of the electrocardiosignal of the preset section, according to signal-to-noise ratio of each channel, obtaining the optimal power frequency interference signals of a system through weighting and estimating the frequency and the phase, and establishing sine waves by combining with the range of each channel; finally conducting subtraction treatment on the preset section of the electrocardiosignal and the reestablished sine wave signals, and accordingly obtainingthe electrocardiosignal without the power frequency interference. Therefore, the effect of filtering out the power frequency interference signals is achieved, ringing effect is not generated, so thatmeasurement is more accurate, and therefore the problem of signal distortion caused by the ringing effect generated due to using a wave trap in the existing filtering technology is solved.

Description

technical field [0001] The invention belongs to the technical field of signal filtering, in particular to a control method and system for filtering power frequency interference signals. Background technique [0002] ECG measurement is a commonly used physiological information index in clinical practice. There is usually power frequency alternating current interference in the human body's ECG signal detected by the ECG detection equipment used in the hospital. The complex electricity environment will cause obvious interference, which can be identified as sine waves with a frequency of 50 / 60Hz and its higher harmonics. For example, in Asia or Europe, the frequency of domestic electricity is 50Hz; while in North America, The frequency is then 60Hz. The conventional ECG frequency ranges from 0.05 to 100 Hz, the high-frequency QRS wave frequency ranges from 80 to 300 Hz, and the ventricular late potential frequency ranges up to 500 Hz. Therefore, for areas where 50Hz alternati...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a control method and system for filtering out power frequency interference signals, aiming to solve the problem of ringing effect caused by the use of notch filters in the existing signal filtering technology, resulting in signal distortion or even submersion of the signal The problem

More generally speaking, the invention disclosed here solves the defects existing in various notch wave techniques, especially for the measurement of ventricular late potential and the analysis of high-frequency QRS waves, providing a new band-stop filtering technique

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