Method and device for acquiring fetal heart sound signal envelope

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,...

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

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