A non-negative blind separation fetal heart sound analysis method and device
An analysis method and blind separation technology, applied in image analysis, pulse/heart rate measurement, image enhancement, etc., can solve the problem of difficult detection of autocorrelation function waveform, achieve good clinical fetal heart rate monitoring effect, high accuracy, and rapid extraction Effect
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[0051] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0052] Such as figure 1 As shown, a non-negative blind separation fetal heart sound analysis method comprises the following steps:
[0053] 1) collecting fetal heart sound signals;
[0054] 2 pairs figure 2 The fetal heart sound signal collected in the computer is preprocessed, and the preprocessing process adopts wavelet transform that can effectively remove noise and maintain the local singularity of the signal;
[0055] 3) Transform the preprocessed signal into the time-frequency domain to obtain a non-negative spectrum. The method used is: calculate the wigner-ville distribution of the preprocessed signal and obtain its amplitude spectrum as Figure 4 ;
[0056] 4) Use non-negative matrix decomposition to perform blind separation, process the amplitude spectrum of the fetal heart sound signa...
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