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Method and device for acquiring fetal heart sound signal envelope

A technology of signal envelope and fetal heart sound, applied in pulse rate/heart rate measurement, medical science, auscultation instruments, etc., can solve problems such as reduced anti-interference ability and unfavorable fetal heart rate calculation

Active Publication Date: 2013-11-20
EDAN INSTR
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AI Technical Summary

Problems solved by technology

Although the software envelope extraction method has many advantages, the Shannon energy envelope method is beneficial to highlight the medium-intensity amplitude part and suppress the high-intensity and low-intensity components in the original signal, but it will also be enhanced for the medium-intensity interference signal, Not conducive to fetal heart rate calculation
The Hilbert envelope method extracts the signal detail envelope and the principal component envelope at the same time, which is beneficial to analyze the instantaneous frequency of the signal, but the anti-interference ability is reduced

Method used

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  • Method and device for acquiring fetal heart sound signal envelope
  • Method and device for acquiring fetal heart sound signal envelope
  • Method and device for acquiring fetal heart sound signal envelope

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Embodiment Construction

[0059] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0060] Such as figure 1 As shown, in an embodiment of the method and device for obtaining the envelope of the fetal heart sound signal of the present invention, the method for obtaining the envelope of the fetal heart sound signal includes the following steps:

[0061] Step S11 collects the fetal heart sound signal and performs preprocessing: in this step, collects the fetal heart sound signal and performs preprocessing on it, that is, uses a sensor to pick up the fetal heart sound signal of the fetus in the abdomen of the pregnant woman, and then uses the obtained fetal heart sound signal After the sound signal is processed by hardware filtering, amplification, etc., it is input to the acquisition device for data acquisition; then, preprocessing is performed on the acquired fetal heart sound signal, such as band-pass filtering.

[0062] Step S12 obtain...

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Abstract

The invention relates to a method for acquiring fetal heart sound signal envelope. The method comprises the following steps that a fetal heart sound signal is collected, and intervention processing is conducted on the signal; a template signal is acquired, matching filtering is conducted on the fetal heart sound signal after preprocessing by utilizing the template signal, so that a signal-to-noise-ratio wave shape is acquired; non-linear peak enhancement is conducted on the fetal heart sound signal after matching filtering according to slope variation of the signal within two adjacent moments, and the envelope of the fetal heart sound signal after the matching filtering is further acquired. The invention further relates to a device for achieving the method. The method and device for acquiring the fetal heart sound signal envelope has the following advantages of being strong in anti-interference capacity and capable of enabling periodicity of the signal to be more obvious, so that calculation of the following fetal heart rate is facilitated.

Description

technical field [0001] The invention relates to the field of medical equipment, and more specifically, to a method and device for obtaining an envelope of a fetal heart sound signal. Background technique [0002] Fetal heart rate is an important indicator for clinical judgment of fetal health status. Due to the good real-time performance of time-domain calculations, fetal heart rate calculations are generally performed in the time domain. The fetal heart sound signal is a fast-changing non-stationary signal with complex and changeable signal fluctuations, while the fetal heart sound envelope signal is more concise than the fetal heart sound signal, changes relatively slowly, and also contains rich physiological information. In clinical practice, the acquired fetal heart rate envelope signal is often processed to calculate the fetal heart rate value. Therefore, the quality of the envelope signal is directly related to the accuracy of fetal heart rate calculation. At present,...

Claims

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Application Information

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IPC IPC(8): A61B7/00A61B5/024
Inventor 刘锦群
Owner EDAN INSTR
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