A discriminative method for time domain sparsity linear aliasing blind separation model of fetal heart rate detection

Abstract

The invention provides a time-domain sparsity linear aliasing blind separation model discrimination method in fetal electrocardiogram detection, which mainly comprises the following steps: acquiring multiple mother / fetal electrocardiogram aliasing mixed signals from a mother belly; obtaining the position of mother electrocardiogram R wave and the mother electrocardiogram PQRS (Physician Quality Reporting System) wave range from the mixed source signals by using a threshold limitation method; obtaining the position of fetal electrocardiogram R wave and fetal electrocardiogram PQRS wave range by using threshold limitation and wave width limitation methods; judging aliasing between the mother electrocardiogram PQRS wave range and the fetal electrocardiogram PQRS wave range, thereby finding out the time period without aliasing and obtaining the electrocardiogram mixed signal sparse region; and measuring the aliasing linearity in the sparse region by calculating the correlation of the two acquired signals. The method has the advantage of simple structure, is easy to implement, and solves the problem of discrimination of the linear aliasing blind separation model based on source signal time-domain relative sparsity.

Description

technical field [0001] The invention belongs to the technical field of fetal electrocardiogram detection, in particular to a discrimination method for a time-domain sparse linear aliasing blind separation model of fetal electrocardiogram detection. Background technique [0002] With the advancement of science and technology and the improvement of people's living standards, in today's clinical medical field, the demand for effective monitoring of fetal conditions in the mother's body is becoming more and more strong. What followed was the emergence of various methods of fetal monitoring. At present, the clinical monitoring methods for fetal status in the mother mainly include ultrasonic electronic monitoring and fetal ECG monitoring. Among them, Doppler ultrasonic electronic monitoring is currently the most widely used monitoring method, but this method requires the instrument to actively send ultrasonic signals to act on Fetus determines the growth and development status of...

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Problems solved by technology

In addition, the vernix covered by the fetal skin is a fat layer, which has poor electrical conductivity and has an isolation effect.

There are two layers of fetal membranes outside the vernix, and the electrical conductivity is also poor. Therefore, the fetal ECG signal is likely to have a large attenuation, nonlinear distortion and aliasing when it is transmitted from the fetal heart to the abdominal body surface, which does not meet the linearity of blind separation. aliasing model

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