Hilbert transform based fetal electrocardio extraction and fetal heart rate recognition method

A fetal electrocardiogram and fetal heart rate technology, applied in the field of medical devices, can solve problems such as complex calculations and poor results

Pending Publication Date: 2018-02-16
GUANGDONG UNIV OF TECH
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Problems solved by technology

However, the extraction methods of these technologies are subject to many limitations, or the calculation is too complicated, or more manual intervention is required, or the final separation effect is not good

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  • Hilbert transform based fetal electrocardio extraction and fetal heart rate recognition method
  • Hilbert transform based fetal electrocardio extraction and fetal heart rate recognition method
  • Hilbert transform based fetal electrocardio extraction and fetal heart rate recognition method

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Embodiment

[0045] Such as figure 1 Shown, the present invention is based on the fetal electrocardiogram extraction of hilbert transformation and the instantaneous heart rate identification method, comprises the steps: (1) to figure 2 The three-way ECG signal of the mother's abdomen collected in the standard database is subjected to EMD decomposition, and the sampling frequency fs is 1000hz, and the 9-layer imf signal and the remaining item signal are obtained, such as image 3 shown; and the spectral characteristics and instantaneous frequency signals of each layer can be obtained from the decomposed imf signal, such as Figure 4 shown;

[0046] (2 pairs Figure 4 Spectrum characteristics and instantaneous frequency analysis of each layer in the middle, the muscle point interference noise with wide frequency distribution in the first layer can be set to zero, and the decomposed 2, 3, and 4 high-frequency layers can be denoised by empirical thresholds, and the low-frequency layer 9 La...

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Abstract

At present, many researches for using other techniques such as adaptive filtering, singular value decomposition, principal component analysis, a neural network algorithm, ICA, and non-negative blind separation to extract fetal electrocardiosignal (FECG) are reported, but the extraction methods of these techniques suffer a lot of confinements, or are too complex, or need more manual intervention, or are bad in final separation effect. The objective of the invention is to overcome the defects of the conventional FECG extraction methods and provide a hilbert transform based FECG extraction and instant heart rate recognition method which can rapidly and easily acquire FECG and calculate out the fetal instant heart rate by using ECG of a mother abdomen acquired from a FECG database, and can beeasily applied to clinic fetal monitoring.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a method for extracting fetal electrocardiogram and instantaneous heart rate based on hilbert transformation. Background technique [0002] Human ECG signal is a very important signal in biomedical diagnosis, and fetal ECG monitoring for pregnant women is also an important method to detect whether the fetus is developing healthily in the womb. In the process of fetal ECG extraction, it is often affected by power frequency, high frequency such as myoelectricity, and low frequency such as baseline drift caused by breathing, and the collected fetal ECG signal is very weak, generally about tens of μv, or It will alias with the relatively strong maternal ECG signal (Maternal ECG) in time-frequency space. Therefore, these non-effective signals with large amplitude and wide distribution have brought great difficulties to the medical diagnosis of fetal ECG. How to Accurate, convenient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0402A61B5/0444A61B5/00A61B5/0245A61B5/344
CPCA61B5/02411A61B5/0245A61B5/4362A61B5/72A61B5/7203A61B5/7225A61B5/725A61B5/7253A61B2503/02A61B5/316A61B5/318A61B5/344
Inventor 胡锐谢胜利蔡坤朱莉波谢侃
Owner GUANGDONG UNIV OF TECH
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