P wave extracting method based on orthogonal projection and independent component analysis

A technology of independent component analysis and orthogonal projection, which is applied in the field of medical devices and can solve the problems of difficulty in extracting the P-wave of the ECG signal.

Inactive Publication Date: 2020-05-01
杨晨曦
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Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the present invention proposes a P-wave extraction method based on orthogonal project...

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  • P wave extracting method based on orthogonal projection and independent component analysis
  • P wave extracting method based on orthogonal projection and independent component analysis
  • P wave extracting method based on orthogonal projection and independent component analysis

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0018] Such as figure 1 Shown, the present invention is based on orthogonal projection and independent component analysis P wave extracting method, comprises the steps:

[0019] (1) For the collected three-way ECG signal S 1 , S 2 , S 3 Perform comb filtering to remove 0Hz, 50Hz power frequency interference, and high-order harmonic interference. Median filtering removes baseline drift.

[0020] (2) Threshold detection is performed on the processed signal, and the threshold is defined as follows:

[0021]

[0022] Where p is the threshold, here μ is taken as 0.3, is the average of all extreme points.

[0023] (3) Since the QRS complex time of normal people is 0.06-0.08 seconds, and the sampling frequency of the signal is f s =1000Hz, so take the template lengt...

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Abstract

The invention discloses a P wave extracting method based on orthogonal projection and independent component analysis. The P wave extracting method is used for performing analysis and processing on electrocardiosignals, and comprises the steps that signal preprocessing is performed on collected electrocardiosignals; a QRS wave complex mould is obtained through a time domain average method; a QRS wave complex component is filtered out by utilizing the wave complex mould and a spatial orthogonal projection method, and thereby, the signal to noise ratio of a P wave to a T wave in the remaining component is increased; the P wave and the T wave are separated; and then, the P wave is extracted from an original aliasing signal again by taking the P wave obtained after separation as a reference signal by employing a semi-blind method.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a method for extracting P waves based on orthogonal projection and independent component analysis. Background technique [0002] The analysis of ECG signals is widely used in clinical medicine, and the detection of its characteristic parameters plays a key role in the diagnosis and treatment of cardiovascular diseases. QRS complexes, P and T waves are important components of ECG signals, and they reflect different states of cardiac motion. The detection of the characteristic parameters of the ECG signal is mainly to detect and identify the main parameters such as the QRS wave group, P wave, T wave and ST segment in the ECG signal. The QRS wave group is a main feature of the ECG signal and is the The primary problem in electrical signal detection, the same P wave and T wave also have important significance in the diagnosis of heart disease. P waves reflect potential changes duri...

Claims

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Application Information

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IPC IPC(8): A61B5/0452
CPCA61B5/349
Inventor 杨晨曦
Owner 杨晨曦
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