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A separation method and technology of fetal heart sound, applied in the field of signal processing, can solve the problems of difficulty in extracting fetal heart sound and low energy of fetal heart sound
Inactive Publication Date: 2016-01-27
SICHUAN CHANGHONG ELECTRIC CO LTD
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In addition, the energy of fetal heart sounds is low and the spectrum range
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Embodiment 1
[0040] like figure 1 Shown, a kind of fetal heart sound separation method comprises the following steps:
[0041] Step 1. Phase space reconstruction of fetal heart sound signal;
[0042] A1. Calculate the delay time τ and embedding dimension m of fetal heart sound by mutual information method and Cao algorithm respectively;
[0043] A2. Obtain the reconstructed phase space from the selected embedding dimension m and delay time τ Extend the one-dimensional signal to multi-dimensional, that is, m-dimensional.
[0044] The second step. Independent component analysis is performed on the extended m-dimensional row vector;
[0045] B1. The multidimensional row vector expanded in step 1 is formed into a multidimensional matrix MixedS;
[0046] B2. Centralize MixedS so that its mean value is 0;
[0047] B3. Whiten the data, MixedS→MixedS_white, denoted as Z;
[0048] B4. In this application, the number of independent elements is equal to the number of variables m, and the maxim...
Embodiment 2
[0063] like figure 1 Shown, a kind of fetal heart sound separation method, its method step is as follows:
[0064] A. The phase space reconstruction of the fetal heart sound signal X is performed, and the one-dimensional signal of the fetal heart sound signal X is expanded to m dimensions;
[0065] B. Perform independent component analysis on the extended m-dimensional row vector;
[0066] C. Select the independent component with the largest contribution rate in the frequency range of 60-180Hz in the fetal heart sound signal X, and the independent component is the fetal heart sound signal xi;
[0067] D. The selected independent component fetal heart sound signal xi is mapped back to phase space reconstruction to obtain a pure fetal heart sound signal x^;
[0068] E. Carry out further processing on the obtained fetal heart sound signal x^, the processing includes calculating the fetal heart rate.
[0069] The technical scheme of preferred step A of the present invention is: s...
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Abstract
The invention discloses a fetal heart sound separating method. The fetal heart sound separating method comprises the following steps of A, performing phase-space reconstruction on fetal heart sound signals X and expanding one-dimensional signals of the fetal heart sound signals X into m-dimensional signals; B, analyzing independent elements of the expanded m-dimensional row vector; C, selecting the independent element with the maximum contribution rate in the fetal heart sound signals X in a frequency range of 60-180 Hz, wherein the independent element is a fetal heart sound signal xi; D, performing mapping returning phase-space reconstruction on the fetal heart sound signal xi of the selected independent element to obtain a pure fetal heart sound signal x ^; and E, performing further treatment, which comprises fetal heart rate computing, on the obtained fetal heart sound signal x ^. Through a phase-space reconstruction technology and a blind signal treatment technology, fetal heart sound signals are extracted, extracting and treating of heart sound of a fetal in the womb of a pregnant woman are finished, relatively pure fetal sound signals are obtained, and a new way is provided for detecting and monitoring the fetal in a pregnancy period of a woman.
Description
technical field [0001] The invention relates to the technical field of signal processing, in particular to a fetal heart sound separation method. Background technique [0002] Fetal testing during pregnancy is an important process in maternal and child health care. Fetal testing for long-term effective monitoring can help obstetricians determine the health of the fetus, diagnose and treat as early as possible. To realize fetal monitoring, it is necessary to obtain signals reflecting the health status of the fetus. There are usually two types, namely heart sounds and ECG signals. (1) Fetal heart sound signal (Fetal hearts sound). Heart sound is the acoustic signal generated by the vibration of the myocardial contraction and valve opening and closing, reflecting the state of heart activity. The fetal heart rate can be calculated according to the time interval between two adjacent first heart sounds or second heart sounds. (2) Fetal Electrocardiogram (FECG). The ECG signa...
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