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Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation

A Doppler fetus and instantaneous heart rate technology, which is applied in the measurement of pulse/heart rate, etc., can solve the problems of noise interference, the influence of fetal heart sound signal instantaneous heart rate calculation, the change of sound signal strength, etc., and achieve the effect of high accuracy

Active Publication Date: 2014-06-11
GUANGDONG UNIV OF TECH
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Problems solved by technology

However, because the ultrasonic Doppler sound detected from the ultrasonic transducer is mixed with large amplitude and widely distributed noise interference, and when the fetal body moves in the mother's body, the strength of the sound signal changes significantly.
In the time domain and frequency domain, the aliasing of these interference signals has a great impact on the calculation of the instantaneous heart rate of the fetal heart sound signal
[0006] The fetal heart sound signal is a non-stationary signal, and the conventional Fourier transform method cannot describe the frequency components at any time, and cannot perform a comprehensive analysis on it

Method used

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  • Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation
  • Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation
  • Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation

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[0025] The flow chart of the instantaneous heart rate detection of the Doppler fetal heart sound based on the time-frequency analysis of the present invention is as follows figure 1 shown, including the following steps:

[0026] 1) Perform low-pass filter preprocessing on the ultrasonic Doppler fetal heart sound signal x(n) to remove noise to obtain y(n), and the cut-off frequency of the low-pass filter is f H ;

[0027] 2) For y(n), the short-time Fourier transform with a time window of N is used for time-frequency analysis to obtain the time-frequency diagram s(w,t) of the ultrasonic Doppler fetal heart sound;

[0028] 3) Take the modulus of s(w, t), and change the complex signal into a real signal |s(w, t)|;

[0029] 4) In |s(w,t)|, select 5 characteristic frequencies ω x The corresponding time-frequency signal|s(w x ,t)|, where x=1,2,3,4,5;

[0030] 5) |s(w,t)| Perform independent component analysis to get 5 independent components IC x , x=1,2,3,4,5;

[0031] 6) Cro...

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Abstract

The invention provides a Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation. The detection method comprises the following steps that the Doppler fetal cardiac sound is subjected to denoising preprocessing through a low-pass filter; the processed ultrasonic Doppler fetal cardiac sound is subjected to time-frequency analysis, and the short-time Fourier transform is utilized for solving the time-frequency diagram of the ultrasonic Doppler fetal cardiac sound signals; several characteristic frequency bands are selected from the time-frequency diagram according to the priori knowledge of the periodic characteristic of the time-frequency diagram of the fetal cardiac sound signals, then, different selected frequency band signals are subjected to Fast ICA analysis, independent components are worked out, then, the independent component IC which is most matched with the fetal cardiac sound signals is determined, next, a self-correlation function of the most matched independent component IC is calculated, the peak value is detected, and finally, the fetal cardiac sound heart rate is calculated. The Doppler fetal cardiac sound instantaneous heart rate detecting method is used for calculating the instantaneous heart rate on the clinically collected ultrasonic Doppler fetal cardiac sound signals and has the advantages that the method is simple, the calculation speed is high, the flexibility is good, and the accuracy is high.

Description

technical field [0001] The invention is a method for detecting instantaneous heart rate of Doppler fetal heart sounds based on blind separation, in particular a method for detecting instantaneous heart rate of Doppler fetal heart sound signals based on single-channel blind separation, which relates to the field of medical monitoring technology, and belongs to The innovative technology of the detection method of the instantaneous heart rate of Doppler fetal heart sounds based on blind separation. Background technique [0002] Fetal heart rate monitoring is an important means to ensure the safety of fetuses and mothers and to achieve national eugenics. Monitoring the fetus in the mother's body during the perinatal period can greatly reduce the occurrence of hypoxia and ischemia while understanding the fetal development status. Distress, resulting in fetal birth defects, and even fetal death. Electronic fetal heart rate monitoring is currently the most widely used method of fe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/02
Inventor 何昭水谢侃王赛红蔡坤谢胜利
Owner GUANGDONG UNIV OF TECH
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