A method and system for instantaneous heart rate recognition based on non-negative blind separation of fetal ECG

Abstract

The invention discloses a fetal electrocardiogram instantaneous heart rate recognition method and system based on non-negative blind separation. The method comprises the following steps that electrocardiosignals obtained through being collected by a fetal electrocardiogram machine are preprocessed, after the wavelet denoising, a coherent averaging method is used for removing electrocardiogram components of a mother to obtain the fetal electrocardiosignals, the fetal electrocardiosignals are converted to the time-frequency domain to obtain a Choi-Williams spectrum and a Born-Jordan spectrum, and then, the spectrums are converted into a non-negative frequency spectrum; non-negative matrix factorization is used for blind separation to obtain non-negative time frequency components of the fetal electrocardiosignals; the instantaneous heart rate is calculated, the non-negative time frequency components of the obtained fetal electrocardiosignals are subjected to maximum value detection, and a threshold value is set; an interval traversing method is adopted for obtaining the maximum value of signal intervals, and all peak value points of a electrocardiogram curve are obtained; all peak value coordinates of the obtained electrocardiogram curve are converted, the forward difference is sequentially carried out, and the instantaneous heart rate of the fetus is obtained through an instantaneous heart rate formula. The method and the system provided by the invention have the advantages that the recognition is fast and simple, and the accuracy is high.

Description

technical field [0001] The present invention relates to the field of medical devices, and more specifically, to a method and system for recognizing instantaneous heart rate of fetal ECG based on non-negative blind separation. Background technique [0002] Fetal electrocardiogram is an important means of fetal monitoring and an important method to detect the health status of the fetus in the womb, which can reflect the whole picture of the fetal heart. A healthy fetus undergoes subtle changes at different moments in the uterus, and changes in the fetal heart rate are a manifestation of the regulation of the circulatory system and the central nervous system. Important monitoring indicators within. However, due to the small amplitude of the collected fetal ECG signal, the signal-to-noise ratio is low and most of them are mixed with large-amplitude and widely distributed noise interference, such as common power frequency interference, noise caused by breathing, myoelectricity, ...

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