Fetus electrocardio blind separation method based on relative sparsity of time domain of source signal

Abstract

The invention provides a fetus electrocardio blind separation method based on the relative sparsity of time domains of source signals, comprising the following steps of: firstly acquiring mutually overlaid mother-fetus mixed electrocardiosignals of mother and fetus electrocardio in two paths from the body surface of the abdomen of a mother; then carrying out pretreatment on the acquired mother-fetus mixed electrocardiosignals, wherein the pretreatment includes the steps of: correcting the baseline drift of the mother-fetus mixed electrocardiosignals, and filtering the interference of power frequency of 50 Hz, the interference of high-frequency myoelectric signals, and the like; respectively positioning the mother electrocardiosignal and the fetus electrocardiosignal in the pretreated mother-fetus mixed electrocardiosignals; then searching relatively sparse time slices of the mother electrocardio and the fetus electrocardio; and finally separating the mother electrocardiosignal from the fetus electrocardiosignal by utilizing a basic blind source separation algorithm resolved through the general features of a matrix. The invention solves the problem that the time domains and frequency domains of the mother electrocardiosignal and the fetus electrocardiosignal are mutually overlaid and difficult to separate and can efficiently and accurately extract the fetus electrocardiosignal used for medical diagnosis.

Description

Technical field [0001] The invention belongs to the technical field of fetal electrocardiogram detection, and specifically relates to a method for blind separation of fetal electrocardiogram based on the relative sparsity of source signal time domain. Background technique [0002] With the increasing demands of the society on the health and safety of mothers and infants, research on the physiology and pathology of fetal development has become an important topic. Fetal monitoring is an important method for evaluating fetal intrauterine development and safety using biophysical and biochemical methods. At present, the widely used clinical fetal monitoring refers to electronic fetal heart rate monitoring and fetal heart contraction monitoring. Electronic fetal monitoring (EFM, electronic fetal monitoring) based on ultrasound Doppler technology is highly sensitive, and can detect fetal hypoxia and acidosis in time during pregnancy, but EFM has a high false positive rate (ie false ala...

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a method for blindly separating fetal ECG based on the relative sparsity of the source signal in time domain. It can efficiently and accurately extract fetal ECG signals for medical diagnosis because it overlaps with the fetal ECG signal in the time domain and frequency domain and is difficult to separate.

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