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Power frequency interference filtering method for eliminating ringing

A technology of power frequency interference and notch filter, applied in the field of signal processing, can solve problems affecting the accuracy of data analysis and processing, ringing, etc., and achieve the effect of easy implementation, avoiding ringing, and simple method

Active Publication Date: 2013-03-20
EDAN INSTR
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  • Description
  • Claims
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Problems solved by technology

At present, digital filtering technology has been widely used in the processing of power frequency interference, but the existing digital notch filter often produces "ringing" phenomenon when filtering power frequency interference, which affects the analysis and processing of data. accuracy

Method used

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  • Power frequency interference filtering method for eliminating ringing
  • Power frequency interference filtering method for eliminating ringing
  • Power frequency interference filtering method for eliminating ringing

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] In the power frequency interference filtering method of the present invention, step 1, first carry out waveform recognition on the original signal, locate the start and end points of the sudden change part, and for the sudden change signal, use the output and original input of the previous time to obtain this time and add it to the notch filter The input signal after filtering is adjusted by the previous output; step 2, the original information of the non-mutant part is directly filtered by the notch filter as the system output; the original signal of the sudden part is subtracted from the previous filtering As a result, add the head-to-tail straight line connection of the previous filtering result, and then filter through the notch filter, add the filtering result to the previous filtering result, and then subtract the head-to-tail strai...

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Abstract

The invention discloses a power frequency interference filtering method, which is used for filtering power frequency interference with a mutated signal. The method comprises the following steps of: directly filtering an original signal of a nonmutationed part by using a wave trap, and taking the filtered signal as a system output; subtracting a result of previous filtering from an original signal of a mutated part, adding a previous filtering result section in a mode of end-to-end linear connection, filtering by using the wave trap, adding a result of the previous filtering to a filtering result, and subtracting a previous filtering result section in the mode of end-to-end linear connection; and repeating the process. In the electrocardiograph (ECG) detection process, 50 / 60 Hz power frequency interference covers the slight change in an original electrocardiograph, and influences an electrocardiograph diagnosis. When filtering the power frequency interference, the conventional linear time invariant wave trap triggers the ringing after a QRS complex wave, and influences the measurement of signals such as late potential and the like. The power frequency interference filtering method processes the signals of the input and output ends of the wave trap by utilizing detected QRS complex wave terminals, and traps the waves and avoids the ringing at the same time.

Description

technical field [0001] The invention relates to the field of signal processing, and is specifically used for power frequency interference filtering of sudden mutation signals, in particular to a method for filtering power frequency interference components in electrocardiographic signals. Background technique [0002] The ECG signal measured from the human skin is weak, and is often superimposed with various interferences and noises, the most common being the power frequency interference (50Hz or 60Hz) of the power grid. Filtering out power frequency interference is an important problem to be solved in ECG signal processing. At present, digital filtering technology has been widely used in the processing of power frequency interference, but the existing digital notch filter often produces "ringing" phenomenon when filtering power frequency interference, which affects the analysis and processing of data. accuracy. Figure l, figure 2 It shows that in the detection of ECG sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/0402H03H17/02
Inventor 魏大雪廖云朋
Owner EDAN INSTR
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