Fetal electrocardiogram instantaneous heart rate recognition method and system based on non-negative blind separation
A technology of instantaneous heart rate and fetal ECG, which is applied in the field of medical devices and can solve problems such as complex calculations
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[0050] The present invention will be further described below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0051] like figure 1 As shown, the known identification method of calculating fetal instantaneous heart rate based on non-negative matrix factorization blind separation of the present invention comprises the following steps:
[0052] preprocessing, figure 2 The sampling frequency of the fetal ECG signal collected by the fetal ECG machine is fs=500Hz. The collected ECG signal is subjected to wavelet denoising, and the maternal ECG component is removed by the coherent averaging method and the signal is transformed into the time-frequency domain to obtain Choi- Williams spectrum and Born-Jordan spectrum, and then change Choi-Williams spectrum and Born-Jordan spectrum into non-negative spectrum, such as image 3 shown;
[0053] The non-negative Choi-Williams spectrum of the fetal ECG signal x 1 , the ...
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